% Categories: DMS % Encoding: utf-8 @InProceedings{PetscharnigMMM18Demo, author = {Petscharnig, Stefan and Schöffmann, Klaus}, booktitle = {International Conference on Multimedia Modeling}, title = {ActionVis: An Explorative Tool to Visualize Surgical Actions in Gynecologic Laparoscopy}, year = {2018}, address = {Cham, Switzerland}, editor = {not available, yet}, month = {feb}, pages = {1-5}, publisher = {Springer}, abstract = {Appropriate visualization of endoscopic surgery recordings has a huge potential to benefit surgical work life. For example, it enables surgeons to quickly browse medical interventions for purposes of documentation, medical research, discussion with colleagues, and training of young surgeons. Current literature on automatic action recognition for endoscopic surgery covers domains where surgeries follow a standardized pattern, such as cholecystectomy. However, there is a lack of support in domains where such standardization is not possible, such as gynecologic laparoscopy. We provide ActionVis, an interactive tool enabling surgeons to quickly browse endoscopic recordings. Our tool analyses the results of a post-processing of the recorded surgery. Information on individual frames are aggregated temporally into a set of scenes representing frequent surgical actions in gynecologic laparoscopy, which help surgeons to navigate within endoscopic recordings in this domain.}, doi = {10.1007/978-3-319-73600-6_30}, language = {EN}, location = {Bangkok, Thailand}, talkdate = {2018.02.05}, talktype = {poster}, url = {https://link.springer.com/chapter/10.1007/978-3-319-73600-6_30} } @InProceedings{mluxmartina2017, author = {Pogorelov, Konstantin and Riegler, Michael and Halvorsen, Pal and Griwodz, Carsten and de Lange, Thomas and Randel, Kristin and Eskeland, Sigrun and Dang-Ngyuen, Duc-Tien and Ostroukhova, Olga and Lux, Mathias and Spampinato, Concetto}, booktitle = {Working Notes Proceedings of the MediaEval 2017 Workshop}, title = {A Comparison of Deep Learning with Global Features for Gastrointestinal Disease Detection}, year = {2017}, address = {Dublin, Ireland}, editor = {Gravier, Guillaume and Bischke, Benjamin and Demarty, Claire-Hélène and Zaharieva, Maia and Riegler, Michael and Dellandrea, Emmanuel and Bogdanov, Dmitry and Sutcliffe, Richard and Jones, Gareth and Larson, Martha}, month = {sep}, pages = {3}, publisher = {CEUR Workshop Proceedings}, abstract = {This paper presents our approach for the 2017 Multimedia for Medicine Medico Task of the MediaEval 2017 Benchmark. We propose a system based on global features and deep neural networks, and preliminary results comparing the approaches are presented.}, language = {EN}, location = {Dublin, Ireland}, talkdate = {2017.09.14}, talktype = {registered}, url = {http://ceur-ws.org/Vol-1984/} } @InProceedings{mlux2017, author = {Riegler, Michael and Pogorelov, Konstantin and Halvorsen, Pal and Randel, Kristin and Eskeland, Sigrun and Dang-Nguyen, Duc-Tien and Lux, Mathias and Griwodz, Carsten and Spampinato, Concetto and de Lange, Thomas}, booktitle = {Working Notes Proceedings of the MediaEval 2017 Workshop}, title = {Multimedia for Medicine: The Medico Task at MediaEval 2017}, year = {2017}, address = {Dublin, Ireland}, editor = {Gravier, Guillaume and Bischke, Benjamin and Demarty, Claire-Hélène and Zaharieva, Maia and Riegler, Michael and Dellandrea, Emmanuel and Bogdanov, Dmitry and Sutcliffe, Richard and Jones, Gareth and Larson, Martha}, month = {jan}, pages = {3}, publisher = {CEUR Workshop Proceedings}, abstract = {The Multimedia for Medicine Medico Task, running for the first time as part of MediaEval 2017, focuses on detecting abnormalities, diseases and anatomical landmarks in images captured by medical devices in the gastrointestinal tract. The task characteristics are described, including the use case and its challenges, the dataset with ground truth, the required participant runs and the evaluation metrics.}, language = {EN}, location = {Dublin, Ireland}, talkdate = {2017.09.14}, talktype = {registered} } @InProceedings{martina2017, author = {Lux, Mathias and Riegler, Michael and Macstravic, Glenn}, booktitle = {ICMR '17 Proceedings of the 2017 ACM on International Conference on Multimedia Retrieval}, title = {LireSolr: A Visual Information Retrieval Server}, year = {2017}, address = {New Yor New York, USA}, editor = {Sebe, Nicu and Ionescu, Bogdan}, month = {jun}, pages = {3}, publisher = {ACM}, abstract = {In this paper, we present LireSolr, an open source image retrieval server, build on top of the LIRE library and the Apache Solr search server. With LireSolr, visual information retrieval can be run on a server, which allows better distribution of workloads and simplifies applications in several areas including mobile and web. Furthermore, we showcase several example scenarios how LireSolr can be used to point out the broad range of possibilities and applications. The system is easy to install and setup, and the large number of retrieval tools either provided by LIRE or by other Apache Solr is made easily available on the search server. Moreover, our tool demonstrates how predictions from CNNs can easily be used to extend the visual information retrieval functionality.}, doi = {10.1145/3078971.3079014}, isbn10 = {978-1-4503-4701-3}, language = {EN}, location = {Bukarest, Rumänien}, talkdate = {2017.06.08}, talktype = {poster}, url = {https://dl.acm.org/citation.cfm?id=3079014} } @PhdThesis{Taschwer2017, author = {Taschwer, Mario}, school = {Alpen-Adria-Universit{\"a}t Klagenfurt}, title = {Concept-Based and Multimodal Methods for Medical Case Retrieval}, year = {2017}, address = {Austria}, month = {mar}, abstract = {Medical case retrieval (MCR) is defined as a multimedia retrieval problem, where the document collection consists of medical case descriptions that pertain to particular diseases, patients' histories, or other entities of biomedical knowledge. Case descriptions are multimedia documents containing textual and visual modalities (images). A query may consist of a textual description of patient's symptoms and related diagnostic images. This thesis proposes and evaluates methods that aim at improving MCR effectiveness over the baseline of fulltext retrieval. We hypothesize that this objective can be achieved by utilizing controlled vocabularies of biomedical concepts for query expansion and concept-based retrieval. The latter represents case descriptions and queries as vectors of biomedical concepts, which may be generated automatically from textual and/or visual modalities by concept mapping algorithms. We propose a multimodal retrieval framework for MCR by late fusion of text-based retrieval (including query expansion) and concept-based retrieval and show that retrieval effectiveness can be improved by 49% using linear fusion of practical component retrieval systems. The potential of further improvement is experimentally estimated as a 166% increase of effectiveness over fulltext retrieval using query-adaptive fusion of ideal component retrieval systems. Additional contributions of this thesis include the proposal and comparative evaluation of methods for concept mapping, query and document expansion, and automatic classification and separation of compound figures found in case descriptions.}, language = {EN}, pages = {200}, pdf = {https://www.itec.aau.at/bib/files/phd-thesis-taschwer.pdf} } @InProceedings{SchoeffmannTutorialACMMM2017, author = {Schoeffmann,Klaus and Münzer,Bernd and Riegler,Michael and Halvorsen,Paal}, booktitle = {MM ’17 Proceedings of the 2017 ACM on Multimedia Conference}, title = {Medical Multimedia Information Systems (MMIS)}, year = {2017}, address = {New York, NY, USA}, editor = {Liu, Qiong and Lienhart, Rainer and Wang, Haohong}, month = {oct}, pages = {1957-1958}, publisher = {ACM}, abstract = {In hospitals all around the world, medical multimedia information systems have gained high importance over the last few years. One of the reasons is that an increasing number of interventions are performed in a minimally invasive way. These endoscopic inspections and surgeries are performed with a tiny camera -- the endoscope -- which produces a video signal that is used to control the intervention. Apart from the viewing purpose, the video signal is also used for automatic content analysis during the intervention as well as for post-surgical usage, such as communicating operation techniques, planning future interventions, and medical forensics. Another reason is video documentation, which is even enforced by law in some countries. The problem, however, is the sheer amount of unstructured medical videos that are added to the multimedia archive on a daily basis. Without proper management and a multimedia information system, the medical videos cannot be used efficiently for post-surgical scenarios. It is therefore already foreseeable that medical multimedia information systems will gain even more attraction in the next few years. In this tutorial we will introduce the audience to this challenging new field, describe the domain-specific characteristics and challenges of medical multimedia data, introduce related use cases, and talk about existing works -- contributed by the medical imaging and robotics community, but also already partly from the multimedia community -- as well as the many open issues and challenges that bear high research potential.}, doi = {10.1145/3123266.3130142}, isbn10 = {978-1-4503-4906-2}, keywords = {endoscopic video, medical image processing, medical multimedia}, language = {EN}, location = {Mountain View, CA}, talkdate = {2017.10.27}, talktype = {registered}, url = {https://dl.acm.org/citation.cfm?id=3130142} } @Article{Schoeffmann2017MTAPHusslein, author = {Schoeffmann, Klaus and Husslein, Heinrich and Kletz, Sabrina and Petscharnig, Stefan and Münzer, Bernd and Beecks, Christian}, journal = {Multimedia Tools and Applications}, title = {Video Retrieval in Laparoscopic Video Recordings with Dynamic Content Descriptors}, year = {2017}, month = {nov}, pages = {18}, address = {USA}, language = {EN}, publisher = {Springer US} } @InProceedings{Schoeffmann2017MMM, author = {Schoeffmann, Klaus and Primus, Manfred Jürgen and Muenzer, Bernd and Petscharnig, Stefan and Karisch, Christoph and Xu, Qing and Huerst, Wolfgang}, booktitle = {MultiMedia Modeling: 23rd International Conference, MMM 2017, Reykjavik, Iceland, January 4-6, 2017, Proceedings, Part II}, title = {Collaborative Feature Maps for Interactive Video Search}, year = {2017}, address = {Cham}, editor = {Amsaleg, Laurent and Guðmundsson, Gylfi Þór and Gurrin, Cathal and Jónsson, Björn Þór and Satoh, Shin’ichi}, month = {jan}, pages = {457-462}, publisher = {Springer International Publishing}, abstract = {This extended demo paper summarizes our interface used for the Video Browser Showdown (VBS) 2017 competition, where visual and textual known-item search (KIS) tasks, as well as ad-hoc video search (AVS) tasks in a 600-h video archive need to be solved interactively. To this end, we propose a very flexible distributed video search system that combines many ideas of related work in a novel and collaborative way, such that several users can work together and explore the video archive in a complementary manner. The main interface is a perspective Feature Map, which shows keyframes of shots arranged according to a selected content similarity feature (e.g., color, motion, semantic concepts, etc.). This Feature Map is accompanied by additional views, which allow users to search and filter according to a particular content feature. For collaboration of several users we provide a cooperative heatmap that shows a synchronized view of inspection actions of all users. Moreover, we use collaborative re-ranking of shots (in specific views) based on retrieved results of other users.}, doi = {10.1007/978-3-319-51814-5_41}, language = {EN}, location = {Reykjavik, Iceland}, talkdate = {2017.01.04}, talktype = {registered}, url = {https://link.springer.com/chapter/10.1007/978-3-319-51814-5_41#copyrightInformation} } @InProceedings{Schoeffmann2017CHIIR, author = {Hopfgartner,Frank and Schoeffmann,Klaus}, booktitle = {Proceedings of the 2017 Conference on Conference Human Information Interaction and Retrieval (CHIIR'17)}, title = {Interactive Search in Video \& Lifelogging Repositories}, year = {2017}, address = {New York, NY, USA}, editor = {Nordlie, ragnar and Pharo, Nils}, month = {mar}, pages = {421-423}, publisher = {ACM}, abstract = {Due to increasing possibilities to create digital video, we are facing the emergence of large video archives that are made accessible either online or offline. Though a lot of research has been spent on video retrieval tools and methods, which allow for automatic search in videos, still the performance of automatic video retrieval is far from optimal. At the same time, the organization of personal data is receiving increasing research attention due to the challenges that are faced in gathering, enriching, searching and visualizing this data. Given the increasing quantities of personal data being gathered by individuals, the concept of a heterogeneous personal digital libraries of rich multimedia and sensory content for every individual is becoming a reality. Despite the differences between video archives and personal lifelogging libraries, we are facing very similar challenges when accessing these multimedia repositories. For example, users will struggle to find the information they are looking for in either collection if they are not able to formulate their search needs through a query. In this tutorial we discussed (i) proposed solutions for improved video & lifelog content navigation, (ii) typical interaction of content-based querying features, and (iii) advanced content visualization methods. Moreover, we discussed and demonstrate interactive video & lifelog search systems and ways to evaluate their performance.}, doi = {10.1145/3020165.3022161}, isbn10 = {978-1-4503-4677-1}, language = {EN}, location = {Oslo}, talkdate = {2017.03.07}, talktype = {registered}, url = {https://dl.acm.org/citation.cfm?id=3022161} } @InProceedings{PrimusTrecVID2017, author = {Primus, Manfred Jürgen and Münzer, Bernd and Schoeffmann, Klaus}, booktitle = {Proceedings of TRECVID 2017}, title = {ITEC-UNIKLU Ad-Hoc Video Search Submission 2017}, year = {2017}, address = {NIST, Gaithersburg, MD, USA}, editor = {Awad,George and Butt,Asad and Fiscus,Jonathan and Joy,David and Delgado,Andrew and Michel,Martial and Smeaton,Alan and Graham,Yvette and Kraaij,Wessel and Quénot,Georges and Eskevich,Maria and Ordelman,Roeland and Jones,Gareth and Huet,Benoit}, month = {nov}, pages = {10}, publisher = {NIST, USA}, abstract = {This paper describes our approach used for the fully automatic and manually assisted Ad-hoc Video Search (AVS) task for TRECVID 2017. We focus on the combination of different convolutional neural network models and query optimization. Each of this model focus on a specific query part, which could be, e.g., location, objects, or the wide-ranging ImageNet classes. All classification results are collected in different combinations in Lucene indixes. For the manually assisted run we use a junk filter and different query optimization methods.}, language = {EN}, location = {Gaithersburg, MD, USA}, talkdate = {2017.11.13}, talktype = {poster} } @InProceedings{Petscharnig_2017_DS, title = {Semi-Automatic Retrieval of Relevant Segments from Laparoscopic Surgery Videos}, author = {Petscharnig, Stefan}, booktitle = {Proceedings of the 2017 ACM on International Conference on Multimedia Retrieval}, year = {2017}, address = {New York, NY, USA}, editor = {Ionescu, Bogdan and Sebe, Nicu}, month = {jun}, pages = {484--488}, publisher = {ACM}, series = {ICMR '17}, abstract = {Over the last decades, progress in medical technology and imaging technology enabled the technique of minimally invasive surgery. In addition, multimedia technologies allow for retrospective analyses of surgeries. The accumulated videos and images allow for a speed-up in documentation, easier medical case assessment across surgeons, training young surgeons, as well as they find the usage in medical research. Considering a surgery lasting for hours of routine work, surgeons only need to see short video segments of interest to assess a case. Surgeons do not have the time to manually extract video sequences of their surgeries from their big multimedia databases as they do not have the resources for this time-consuming task. The thesis deals with the questions of how to semantically classify video frames using Convolutional Neural Networks into different semantic concepts of surgical actions and anatomical structures. In order to achieve this goal, the capabilities of predefined CNN architectures and transfer learning in the laparoscopic video domain are investigated. The results are expected to improve by domain-specific adaptation of the CNN input layers, i.e. by fusion of the image with motion and relevance information. Finally, the thesis investigates to what extent surgeons' needs are covered with the proposed extraction of relevant scenes.}, doi = {10.1145/3078971.3079008}, keywords = {endoscopic image classification, endoscopic video retrieval}, language = {EN}, location = {Bucharest, Romania}, talkdate = {2017.06.08}, talktype = {registered}, url = {http://doi.acm.org/10.1145/3078971.3079008} } @InProceedings{PetscharnigSparDa2017, author = {Petscharnig, Stefan and Lux, Mathias and Chatzichristofis, Savvas}, booktitle = {15th International Workshop on Content-Based Multimedia Indexing}, title = {Dimensionality Reduction for Image Features using Deep Learning and Autoencoders}, year = {2017}, address = {New York, USA}, editor = {Bertini, Marco}, month = {jun}, pages = {.}, publisher = {ACM}, abstract = {The field of similarity based image retrieval has experienced a game changer lately. Hand crafted image features have been vastly outperformed by machine learning based approaches. Deep learning methods are very good at finding optimal features for a domain, given enough data is available to learn from. However, hand crafted features are still means to an end in domains, where the data either is not freely available, i.e. because it violates privacy, where there are commercial concerns, or where it cannot be transmitted, i.e. due to bandwidth limitations. Moreover, we have to rely on hand crafted methods whenever neural networks cannot be trained effectively, e.g. if there is not enough training data. In this paper, we investigate a particular approach to combine hand crafted features and deep learning to (i) achieve early fusion of off the shelf handcrafted global image features and (ii) reduce the overall number of dimensions to combine both worlds. This method allows for fast image retrieval in domains, where training data is sparse.}, doi = {10.1145/3095713.3095737}, isbn10 = {978-1-4503-5333-5}, language = {EN}, location = {Firenze, Italy}, talkdate = {2017.06.21}, talktype = {registered}, url = {https://dl.acm.org/citation.cfm?id=3095737} } @InProceedings{PetscharnigMMM17, author = {Petscharnig, Stefan and Schoeffmann, Klaus}, booktitle = {International Conference on Multimedia Modeling}, title = {Deep Learning of Shot Classification in Gynecologic Surgery Videos}, year = {2017}, address = {Cham}, editor = {Amsaleg, Laurent and Guðmundsson, Gylfi Þór and Gurrin, Cathal and Jónsson, Björn Þór and Satoh, Shin’ichi}, month = {jan}, pages = {702-713}, publisher = {Springer}, abstract = {In the last decade, advances in endoscopic surgery resulted in vast amounts of video data which is used for documentation, analysis, and education purposes. In order to find video scenes relevant for aforementioned purposes, physicians manually search and annotate hours of endoscopic surgery videos. This process is tedious and time-consuming, thus motivating the (semi-)automatic annotation of such surgery videos. In this work, we want to investigate whether the single-frame model for semantic surgery shot classification is feasible and useful in practice. We approach this problem by further training of AlexNet, an already pre-trained CNN architecture. Thus, we are able to transfer knowledge gathered from the Imagenet database to the medical use case of shot classification in endoscopic surgery videos. We annotate hours of endoscopic surgery videos for training and testing data. Our results imply that the CNN-based single-frame classification approach is able to provide useful suggestions to medical experts while annotating video scenes. Hence, the annotation process is consequently improved. Future work shall consider the evaluation of more sophisticated classification methods incorporating the temporal video dimension, which is expected to improve on the baseline evaluation done in this work.}, edition = {LNCS 10132}, keywords = {Multimedia content analysis, Convolutional neural networks, Deep learning, Medical shot classification}, language = {EN}, location = {Klagenfurt, Austria}, talkdate = {2017.01.05}, talktype = {registered}, url = {https://link.springer.com/chapter/10.1007/978-3-319-51811-4_57} } @InProceedings{PetscharnigME17, author = {Petscharnig, Stefan and Schoeffmann, Klaus and Lux, Mathias}, booktitle = {Working Notes Proceedings of the MediaEval 2017 Workshop}, title = {An Inception-like CNN Architecture for GI Disease and Anatomical Landmark Classification}, year = {2017}, address = {Vol-1984}, editor = {Gravier, Guillaume and Bischke, Benjamin and Demarty, Claire-Hélène and Zaharieva, Maia and Riegler, Michael and Dellandrea, Emmanuel and Bogdanov, Dmitry and Sutcliffe, Richard and Jones, Gareth and Larson, Martha}, month = {oct}, pages = {1--3}, publisher = {CEUR-WS}, abstract = {In this working note, we describe our approach to gastrointestinal disease and anatomical landmark classification for the Medico task at MediaEval 2017. We propose an inception-like CNN architecture and a fixed-crop data augmentation scheme for training and testing. The architecture is based on GoogLeNet and designed to keep the number of trainable parameters and its computational overhead small. Preliminary experiments show that the architecture is able to learn the classification problem from scratch using a tiny fraction of the provided training data only.}, language = {EN}, location = {Dublin, Ireland}, talkdate = {2017.09.15}, talktype = {registered}, url = {http://slim-sig.irisa.fr/me17/} } @Article{Petscharnig2017, author = {Petscharnig, Stefan and Schoeffmann, Klaus}, journal = {Multimedia Tools and Applications}, title = {Learning laparoscopic video shot classification for gynecological surgery}, year = {2017}, issn = {1573-7721}, month = {apr}, pages = {1-19}, abstract = {Videos of endoscopic surgery are used for education of medical experts, analysis in medical research, and documentation for everyday clinical life. Hand-crafted image descriptors lack the capabilities of a semantic classification of surgical actions and video shots of anatomical structures. In this work, we investigate how well single-frame convolutional neural networks (CNN) for semantic shot classification in gynecologic surgery work. Together with medical experts, we manually annotate hours of raw endoscopic gynecologic surgery videos showing endometriosis treatment and myoma resection of over 100 patients. The cleaned ground truth dataset comprises 9 h of annotated video material (from 111 different recordings). We use the well-known CNN architectures AlexNet and GoogLeNet and train these architectures for both, surgical actions and anatomy, from scratch. Furthermore, we extract high-level features from AlexNet with weights from a pre-trained model from the Caffe model zoo and feed them to an SVM classifier. Our evaluation shows that we reach an average recall of .697 and .515 for classification of anatomical structures and surgical actions respectively using off-the-shelf CNN features. Using GoogLeNet, we achieve a mean recall of .782 and .617 for classification of anatomical structures and surgical actions respectively. With AlexNet the achieved recall is .615 for anatomical structures and .469 for surgical action classification respectively. The main conclusion of our work is that advances in general image classification methods transfer to the domain of endoscopic surgery videos in gynecology. This is relevant as this domain is different from natural images, e.g. it is distinguished by smoke, reflections, or a limited amount of colors.}, address = {Berlin, Heidelberg, New York}, doi = {10.1007/s11042-017-4699-5}, keywords = {Video classification, Deep learning, Convolutional Neural Network}, language = {EN}, publisher = {Springer}, url = {http://dx.doi.org/10.1007/s11042-017-4699-5} } @InProceedings{Muenzer2017c, author = {Münzer, Bernd and Primus, Manfred Jürgen and Kletz, Sabrina and Petscharnig, Stefan and Schoeffmann, Klaus}, booktitle = {IEEE International Symposium on Multimedia (ISM2017)}, title = {Static vs. Dynamic Content Descriptors for Video Retrieval in Laparoscopy}, year = {2017}, address = {Taichung, Taiwan}, editor = {Chang, Kang-Ming and Chang, Wen-Thong}, month = {dec}, pages = {8}, publisher = {IEEE}, abstract = {The domain of minimally invasive surgery has recently attracted attention from the Multimedia community due to the fact that systematic video documentation is on the rise in this medical field. The vastly growing volumes of video archives demand for effective and efficient techniques to retrieve specific information from large video collections with visually very homogeneous content. One specific challenge in this context is to retrieve scenes showing similar surgical actions, i.e., similarity search. Although this task has a high and constantly growing relevance for surgeons and other health professionals, it has rarely been investigated in the literature so far for this particular domain. In this paper, we propose and evaluate a number of both static and dynamic content descriptors for this purpose. The former only take into account individual images, while the latter consider the motion within a scene. Our experimental results show that although static descriptors achieve the highest overall performance, dynamic descriptors are much more discriminative for certain classes of surgical actions. We conclude that the two approaches have complementary strengths and further research should investigate methods to combine them.}, language = {EN}, location = {Taichung, Taiwan}, talkdate = {2017.12.12}, talktype = {registered} } @InProceedings{Muenzer2017b, author = {Münzer, Bernd and Schoeffmann, Klaus and Böszörmenyi, Laszlo}, booktitle = {IEEE International Symposium on Multimedia (ISM2017)}, title = {EndoXplore: A Web-based Video Explorer for Endoscopic Videos}, year = {2017}, address = {Taichung, Taiwan}, editor = {Chang, Kang-Ming and Chang, Wen-Thong}, month = {dec}, pages = {2}, publisher = {IEEE}, abstract = {The rapidly increasing volume of videos recorded in the course of endoscopic screenings and surgeries poses demanding challenges to video retrieval and browsing systems. Surgeons typically have to use standard video players to retrospectively review their procedures, which is an extremely cumbersome and time-consuming process. We present an HTML5-based video explorer that is specially tailored to this purpose and enables a time-efficient post-operative review of procedures. It incorporates various interactive browsing mechanisms as well as domain-specific content-based features based on previous research results. Preliminary interviews with surgeons indicate that this tool can considerably improve retrieval and browsing efficiency for users in the medical domain and allows surgeons to more easily and quickly revisit specific moments in recordings of their endoscopic surgeries.}, language = {EN}, location = {Taichung, Taiwan}, talkdate = {2017.12.11}, talktype = {poster} } @InProceedings{Muenzer2017a, author = {Münzer, Bernd and Primus, Manfred Jürgen and Hudelist, Marco and Beecks, Christian and Hürst, Wolfgang and Schoeffmann, Klaus}, booktitle = {2017 IEEE International Conference on Multimedia \& Expo Workshops (ICMEW)}, title = {When content-based video retrieval and human computation unite: Towards effective collaborative video search}, year = {2017}, address = {Hongkong, China}, editor = {Chan, Yui-Lam and Rahardja, Susanto}, month = {jul}, pages = {214-219}, publisher = {IEEE}, abstract = {Although content-based retrieval methods achieved very good results for large-scale video collections in recent years, they still suffer from various deficiencies. On the other hand, plain human perception is a very powerful ability that still outperforms automatic methods in appropriate settings, but is very limited when it comes to large-scale data collections. In this paper, we propose to take the best from both worlds by combining an advanced content-based retrieval system featuring various query modalities with a straightforward mobile tool that is optimized for fast human perception in a sequential manner. In this collaborative system with multiple users, both subsystems benefit from each other: The results of issued queries are used to re-rank the video list on the tablet tool, which in turn notifies the retrieval tool about parts of the dataset that have already been inspected in detail and can be omitted in subsequent queries. The preliminary experiments show promising results in terms of search performance.}, doi = {10.1109/ICMEW.2017.8026262}, language = {EN}, location = {Hongkong}, talkdate = {2017.07.10}, talktype = {registered} } @Article{Muenzer2017, author = {Münzer, Bernd and Schoeffmann, Klaus and Böszörmenyi, Laszlo}, journal = {Multimedia Tools and Applications}, title = {Content-based processing and analysis of endoscopic images and videos: A survey}, year = {2017}, month = {jan}, pages = {1-40}, abstract = {In recent years, digital endoscopy has established as key technology for medical screenings and minimally invasive surgery. Since then, various research communities with manifold backgrounds have picked up on the idea of processing and automatically analyzing the inherently available video signal that is produced by the endoscopic camera. Proposed works mainly include image processing techniques, pattern recognition, machine learning methods and Computer Vision algorithms. While most contributions deal with real-time assistance at procedure time, the post-procedural processing of recorded videos is still in its infancy. Many post-processing problems are based on typical Multimedia methods like indexing, retrieval, summarization and video interaction, but have only been sparsely addressed so far for this domain. The goals of this survey are (1) to introduce this research field to a broader audience in the Multimedia community to stimulate further research, (2) to describe domain-specific characteristics of endoscopic videos that need to be addressed in a pre-processing step, and (3) to systematically bring together the very diverse research results for the first time to provide a broader overview of related research that is currently not perceived as belonging together.}, address = {Berlin, Heidelberg, New York}, doi = {10.1007/s11042-016-4219-z}, language = {EN}, publisher = {Springer}, url = {https://link.springer.com/article/10.1007/s11042-016-4219-z} } @InProceedings{Leibetseder2017c, author = {Leibetseder, Andreas and Münzer, Bernd and Schoeffmann, Klaus}, booktitle = {IEEE International Symposium on Multimedia (ISM2017)}, title = {A Tool for Endometriosis Annotation in Endoscopic Videos}, year = {2017}, address = {Taichung, Taiwan}, editor = {Chang, Kang-Ming and Chang, Wen-Thong}, month = {dec}, pages = {2}, publisher = {IEEE}, abstract = {When regarding physicians’ tremendously packed timetables, it comes as no surprise that they start managing even critical situations hastily in order to cope with the high demands laid out for them. Apart from treating patients’ conditions they as well are required to perform time-consuming administrative tasks, including post-surgery video analyses. Concerning documentation of minimally invasive surgeries (MIS), specifically endoscopy, such processes usually involve repeatedly perusing through lengthy, in the worst case uncut recordings – a redundant task that nowadays can be optimized by using readily available technology: we present a tool for annotating endoscopic video frames targeting a specific use case – endometriosis, i.e. the dislocation of uterine-like tissue.}, language = {EN}, location = {Taichung, Taiwan}, talkdate = {2017.12.11}, talktype = {poster} } @InProceedings{Leibetseder2017b, author = {Leibetseder, Andreas and Primus, Manfred Jürgen and Petscharnig, Stefan and Schoeffmann, Klaus}, booktitle = {Proceedings of the on Thematic Workshops of ACM Multimedia 2017}, title = {Real-Time Image-based Smoke Detection in Endoscopic Videos}, year = {2017}, address = {New York, NY, USA}, editor = {Wu, Wanmin and Yag, Jiancho and Tian, Qi and Zimmermann, Roger}, month = {jan}, pages = {296--304}, publisher = {ACM}, series = {Thematic Workshops '17}, abstract = {The nature of endoscopy as a type of minimally invasive surgery (MIS) requires surgeons to perform complex operations by merely inspecting a live camera feed. Inherently, a successful intervention depends upon ensuring proper working conditions, such as skillful camera handling, adequate lighting and removal of confounding factors, such as fluids or smoke. The latter is an undesirable byproduct of cauterizing tissue and not only constitutes a health hazard for the medical staff as well as the treated patients, it can also considerably obstruct the operating physician's field of view. Therefore, as a standard procedure the gaseous matter is evacuated by using specialized smoke suction systems that typically are activated manually whenever considered appropriate. We argue that image-based smoke detection can be employed to undertake such a decision, while as well being a useful indicator for relevant scenes in post-procedure analyses. This work represents a continued effort to previously conducted studies utilizing pre-trained convolutional neural networks (CNNs) and threshold-based saturation analysis. Specifically, we explore further methodologies for comparison and provide as well as evaluate a public dataset comprising over 100K smoke/non-smoke images extracted from the Cholec80 dataset, which is composed of 80 different cholecystectomy procedures. Having applied deep learning to merely 20K images of a custom dataset, we achieve Receiver Operating Characteristic (ROC) curves enclosing areas of over 0.98 for custom datasets and over 0.77 for the public dataset. Surprisingly, a fixed threshold for saturation-based histogram analysis still yields areas of over 0.78 and 0.75.}, doi = {10.1145/3126686.3126690}, isbn10 = {978-1-4503-5416-5}, keywords = {cnn classification, deep learning, endoscopic surgery, image processing, smoke detection}, language = {EN}, location = {Mountain View, California, USA}, talkdate = {2017.10.27}, talktype = {registered}, url = {http://doi.acm.org/10.1145/3126686.3126690} } @InProceedings{Leibetseder2017, author = {Leibetseder, Andreas and Primus, Manfred Jürgen and Petscharnig, Stefan and Schoeffmann, Klaus}, booktitle = {Computer Assisted and Robotic Endoscopy and Clinical Image-Based Procedures: 4th International Workshop, CARE 2017, and 6th International Workshop, CLIP 2017, Held in Conjunction with MICCAI 2017, Qu{\'e}bec City, QC, Canada, September 14, 2017, Proceedings}, title = {Image-Based Smoke Detection in Laparoscopic Videos}, year = {2017}, address = {Cham, Schweiz}, editor = {Cardoso, M Jorge and Arbel, Tal and Luo, Xiongbiao and Wesarg, Stefan and Reichl, Tobias and Gonzalez Ballester, Miguel Angel and McLeod, Jonathan and Drechsler, Klaus and Peters, Terry and Erdt, Marius and Mori, Kensaku and Linguraru, Marius George and Uhl, Andreas and Oyarzun Laura, Cristina and Shekhar, Raj}, month = {jan}, pages = {70--87}, publisher = {Springer International Publishing}, abstract = {The development and improper removal of smoke during minimally invasive surgery (MIS) can considerably impede a patient's treatment, while additionally entailing serious deleterious health effects. Hence, state-of-the-art surgical procedures employ smoke evacuation systems, which often still are activated manually by the medical staff or less commonly operate automatically utilizing industrial, highly-specialized and operating room (OR) approved sensors. As an alternate approach, video analysis can be used to take on said detection process -- a topic not yet much researched in aforementioned context. In order to advance in this sector, we propose utilizing an image-based smoke classification task on a pre-trained convolutional neural network (CNN). We provide a custom data set of over 30 000 laparoscopic smoke/non-smoke images, part of which served as training data for GoogLeNet-based [41] CNN models. To be able to compare our research for evaluation, we separately developed a non-CNN classifier based on observing the saturation channel of a sample picture in the HSV color space. While the deep learning approaches yield excellent results with Receiver Operating Characteristic (ROC) curves enclosing areas of over 0.98, the computationally much less costly analysis of an image's saturation histogram under certain circumstances can, surprisingly, as well be a good indicator for smoke with areas under the curves (AUCs) of around 0.92--0.97.}, doi = {10.1007/978-3-319-67543-5_7}, edition = {LNCS}, language = {EN}, location = {Québec City, Kanada}, talkdate = {2017.09.14}, talktype = {registered}, url = {https://doi.org/10.1007/978-3-319-67543-5_7} } @InProceedings{Kletz2017, author = {Kletz, Sabrina and Schoeffmann, Klaus and Münzer, Bernd and Primus, Manfred J and Husslein, Heinrich}, booktitle = {Proceedings of the First ACM Workshop on Educational and Knowledge Technologies (MultiEdTech 2017)}, title = {Surgical Action Retrieval for Assisting Video Review of Laparoscopic Skills}, year = {2017}, address = {Mountain View, California, USA}, editor = {Li, Qiong and Lienhart, Rainer and Wang, Hao Hong}, month = {oct}, pages = {9}, publisher = {ACM}, series = {MultiEdTech '17}, abstract = {An increasing number of surgeons promote video review of laparoscopic surgeries for detection of technical errors at an early stage as well as for training purposes. The reason behind is the fact that laparoscopic surgeries require specific psychomotor skills, which are difficult to learn and teach. The manual inspection of surgery video recordings is extremely cumbersome and time-consuming. Hence, there is a strong demand for automated video content analysis methods. In this work, we focus on retrieving surgical actions from video collections of gynecologic surgeries. We propose two novel dynamic content descriptors for similarity search and investigate a query-by-example approach to evaluate the descriptors on a manually annotated dataset consisting of 18 hours of video content. We compare several content descriptors including dynamic information of the segments as well as descriptors containing only spatial information of keyframes of the segments. The evaluation shows that our proposed dynamic content descriptors considering motion and spatial information from the segment achieve a better retrieval performance than static content descriptors ignoring temporal information of the segment at all. The proposed content descriptors in this work enable content-based video search for similar laparoscopic actions, which can be used to assist surgeons in evaluating laparoscopic surgical skills.}, doi = {10.1145/3132390.3132395}, keywords = {feature signatures, laparoscopic video, medical endoscopy, motion analysis, similarity search, video retrieval}, language = {EN}, location = {Mountain View, California, USA}, talkdate = {2017.10.27}, talktype = {registered}, url = {http://doi.acm.org/10.1145/3132390.3132395} } @InProceedings{Hurst2017, author = {Hürst, Wolfgang and Ip Vai Ching, Algernon and Schoeffmann, Klaus and Primus, Manfred Juergen}, booktitle = {MultiMedia Modeling: 23rd International Conference, MMM 2017, Reykjavik, Iceland, January 4-6, 2017, Proceedings, Part II}, title = {Storyboard-Based Video Browsing Using Color and Concept Indices}, year = {2017}, address = {Cham}, editor = {Amsaleg, Laurent and Guðmundsson, Gylfi Þór and Gurrin, Cathal and Jónsson, Björn Þór and Satoh, Shin’ichi}, month = {jan}, pages = {480-485}, publisher = {Springer International Publishing}, abstract = {We present an interface for interactive video browsing where users visually skim storyboard representations of the files in search for known items (known-item search tasks) and textually described subjects, objects, or events (ad-hoc search tasks). Individual segments of the video are represented as a color-sorted storyboard that can be addressed via a color-index. Our storyboard representation is optimized for quick visual inspections considering results from our ongoing research. In addition, a concept based-search is used to filter out parts of the storyboard containing the related concept(s), thus complementing the human-based visual inspection with a semantic, content-based annotation.}, language = {EN}, location = {Reykjavik, Iceland}, talkdate = {2017.01.04}, talktype = {registered} } @InProceedings{Hudelist2017Thumb, author = {Hudelist, Marco and Schoeffmann, Klaus}, booktitle = {International Conference on Multimedia Modeling}, title = {An Evaluation of Video Browsing on Tablets with the ThumbBrowser}, year = {2017}, address = {Cham}, editor = {Amsaleg, Laurent and Guðmundsson, Gylfi Þór and Gurrin, Cathal and Jónsson, Björn Þór and Satoh, Shin’ichi}, month = {jan}, pages = {89-100}, publisher = {Springer}, abstract = {We present an extension and evaluation of a novel interaction concept for video browsing on tablets. It can be argued that the best user experience for watching video on tablets can be achieved when the device is held in landscape orientation. Most mobile video players ignore this fact and make the interaction unnecessarily hard when the tablet is held with both hands. Naturally, in this hand posture only the thumbs are available for interaction. Our ThumbBrowser-interface takes this into account and combines it in its latest iteration with content analysis information as well as two different interaction methods. The interface was already introduced in a basic form in earlier work. In this paper we report on extensions that we applied and show first evaluation results in comparison to standard video players. We are able to show that our video browser is superior in terms of search accuracy and user satisfaction.}, doi = {10.1007/978-3-319-51814-5_8}, isbn10 = {978-3-319-51813-8}, language = {EN}, location = {Klagenfurt, Austria}, talkdate = {2017.01.05}, talktype = {registered} } @InProceedings{Hudelist2017, author = {Hudelist, Marco A and Husslein, Heinrich and Münzer, Bernd and Schoeffmann, Klaus}, booktitle = {Proceedings of the Third IEEE International Conference on Multimedia Big Data (BigMM 2017)}, title = {A Tool to Support Surgical Quality Assessment}, year = {2017}, address = {Laguna Hills, California, USA}, editor = {Chen, Shu-Ching and Sheu, Philip Chen-Yu}, month = {apr}, pages = {2}, publisher = {IEEE}, series = {BigMM'17}, abstract = {In the domain of medical endoscopy an increasing number of surgeons nowadays store video recordings of their interventions in a huge video archive. Among some other purposes, the videos are used for post-hoc surgical quality assessment, since objective assessment of surgical procedures has been identified as essential component for improvement of surgical quality. Currently, such assessment is performed manually and for selected procedures only, since the amount of data and cumbersome interaction is very time-consuming. In the future, quality assessment should be carried out comprehensively and systematically by means of automated assessment algorithms. In this demo paper, we present a tool that supports human assessors in collecting manual annotations and therefore should help them to deal with the huge amount of visual data more efficiently. These annotations will be analyzed and used as training data in the future.}, doi = {10.1109/BigMM.2017.45}, keywords = {data handling, endoscopes, medical image processing, surgery, video signal processing, automated assessment algorithms, human assessor support tool, intervention video recordings, manual annotation collection, medical endoscopy, post-hoc surgical quality assessment, surgical procedure assessment, surgical quality assessment support tool, video archive, visual data, Minimally invasive surgery, Navigation, Quality assessment, Tools, User interfaces, Video recording, generric error rating tool, medical multimedia, surgical quality assessment}, language = {EN}, location = {Laguna Hills, California, USA}, talkdate = {2017.04.21}, talktype = {poster}, url = {http://ieeexplore.ieee.org/document/7966750/} } @InProceedings{Beecks2017, author = {Beecks, Christian and Kletz, Sabrina and Schoeffmann, Klaus}, booktitle = {Proceedings of the Third IEEE International Conference on Multimedia Big Data (BigMM 2017)}, title = {Large-Scale Endoscopic Image and Video Linking with Gradient-Based Signatures}, year = {2017}, address = {Laguna Hills, California, USA}, editor = {Chen, Shu-Ching and Sheu, Philip Chen-Yu}, month = {apr}, pages = {5}, publisher = {IEEE}, series = {BigMM}, abstract = {Given a large-scale video archive of surgical interventions and a medical image showing a specific moment of an operation, how to find the most image-related videos efficiently without the utilization of additional semantic characteristics? In this paper, we investigate a novel content-based approach of linking medical images with relevant video segments arising from endoscopic procedures. We propose to approximate the video segments' content-based features by gradient-based signatures and to index these signatures with the Minkowski distance in order to determine the most query-like video segments efficiently. We benchmark our approach on a large endoscopic image and video archive and show that our approach achieves a significant improvement in efficiency in comparison to the state-of-the-art while maintaining high accuracy.}, doi = {10.1109/BigMM.2017.44}, keywords = {feature signatures, laparoscopic video, medical endoscopy, motion analysis, similarity search, video retrieval}, language = {EN}, location = {Laguna Hills, California, USA}, talkdate = {2017.04.19}, talktype = {registered}, url = {http://ieeexplore.ieee.org/document/7966709/} } @Article{Taschwer2016a, author = {Taschwer, Mario and Marques, Oge}, journal = {Multimedia Tools and Applications}, title = {Automatic Separation of Compound Figures in Scientific Articles}, year = {2016}, issn = {1573-7721}, month = {dec}, pages = {1--30}, abstract = {Content-based analysis and retrieval of digital images found in scientific articles is often hindered by images consisting of multiple subfigures (compound figures). We address this problem by proposing a method (ComFig) to automatically classify and separate compound figures, which consists of two main steps: (i) a supervised compound figure classifier (ComFig classifier) discriminates between compound and non-compound figures using task-specific image features; and (ii) an image processing algorithm is applied to predicted compound images to perform compound figure separation (ComFig separation). The proposed ComFig classifier is shown to achieve state-of-the-art classification performance on a published dataset. Our ComFig separation algorithm shows superior separation accuracy on two different datasets compared to other known automatic approaches. Finally, we propose a method to evaluate the effectiveness of the ComFig chain combining classifier and separation algorithm, and use it to optimize the misclassification loss of the ComFig classifier for maximal effectiveness in the chain.}, address = {New York}, doi = {10.1007/s11042-016-4237-x}, language = {EN}, pdf = {https://www.itec.aau.at/bib/files/fig-separation-mtap.pdf}, publisher = {Springer} } @InProceedings{Taschwer2016, author = {Taschwer, Mario and Marques, Oge}, booktitle = {MultiMedia Modeling}, title = {Compound Figure Separation Combining Edge and Band Separator Detection}, year = {2016}, address = {Cham, Switzerland}, editor = {Tian, Qi and Sebe, Nicu and Qi, Guo-Jun and Huet, Benoit and Hong, Richang and Liu, Xueliang}, month = {jan}, pages = {162--173}, publisher = {Springer International Publishing}, series = {Lecture Notes in Computer Science}, volume = {9516}, abstract = {We propose an image processing algorithm to automatically separate compound figures appearing in scientific articles. We classify compound images into two classes and apply different algorithms for detecting vertical and horizontal separators to each class: the edge-based algorithm aims at detecting visible edges between subfigures, whereas the band-based algorithm tries to detect whitespace separating subfigures (separator bands). The proposed algorithm has been evaluated on two datasets for compound figure separation (CFS) in the biomedical domain and compares well to semi-automatic or more comprehensive state-of-the-art approaches. Additional experiments investigate CFS effectiveness and classification accuracy of various classifier implementations.}, doi = {10.1007/978-3-319-27671-7_14}, isbn13 = {978-3-319-27671-7}, language = {EN}, location = {Miami, FL, USA}, pdf = {https://www.itec.aau.at/bib/files/fig-separation-mmm.pdf}, slides = {https://www.itec.aau.at/bib/files/MMM-2016-Taschwer.pdf}, subtitle = {22nd International Conference, MMM 2016, Miami, FL, USA, January 4-6, 2016}, talkdate = {2016.01.05}, talktype = {registered}, url = {http://link.springer.com/chapter/10.1007/978-3-319-27671-7_14} } @InProceedings{Steinbacher2016, author = {Leibetseder, Andreas and Lux, Mathias}, booktitle = {Proceedings of the Third International Workshop on Gamification for Information Retrieval - co-located with 39th International ACM SIGIR Conference on Research and Development in Information Retrieval (SIGIR 2016)}, title = {Gamifying Fitness or Fitnessifying Games: a Comparative Study}, year = {2016}, address = {Pisa, Italy}, editor = {Hopfgartner, F and Kazai, G and Kruschwitz, U and Meder, M}, month = {jul}, pages = {37-44}, publisher = {CEUR Workshop Proceedings}, volume = {1642}, abstract = {Fitness- or exergames are ubiquitously available, but often lack the main ingredient of successfully gamified systems: fun. This can be attributed to the typical way of designing such games -- highly focusing on specific physical activities, thus, gamifying fitness. Instead, we propose a novel alternate approach to improve motivation for exergaming, which we call fitnessification: integrating physical exercise into very popular games that have been developed keeping fun in mind and frequently are played for long periods of time -- so-called AAA games. In order to evaluate this concept, we have conducted a comparative study examining voluntary participants' reactions to testing an ergometer controlled casual game as well as a modified AAA game. Results indicate strong tendencies of players preferring the newly introduced AAA approach over the casual fitness game.}, issn = {1613-0073}, journal = {International Workshop on Gamification for Information Retrievalic}, language = {EN}, location = {Pisa, Italy}, pdf = {https://www.itec.aau.at/bib/files/__GAMIFIR__Research_Fitnessification.pdf}, talkdate = {2016.07.21}, talktype = {registered}, url = {http://ceur-ws.org/Vol-1642/} } @InProceedings{PrimusTrecVID2016, author = {Primus, Manfred Jürgen and Münzer, Bernd and Petscharnig, Stefan and Schoeffmann, Klaus}, booktitle = {Proceedings of TRECVID 2016}, title = {ITEC-UNIKLU Ad-Hoc Video Search Submission 2016}, year = {2016}, address = {NIST, Gaithersburg, MD, USA}, editor = {Awad, George and Fiscus, Jonathan and Michel, Martial and Joy, David and Kraaij, Wessel and Smeaton, Alan F and Quénot, Georges and Eskevich, Maria and Aly, Robin and Jones, Gareth J F and Ordelman, Roeland and Huet, Benoit and Larson, Martha}, month = {nov}, pages = {10}, publisher = {NIST, USA}, abstract = {In this report we describe our approach to the fully automatic Ad-hoc video search task for TRECVID 2016. We describe how we obtain training data from the web, create according CNN models for the provided queries and use them to classify keyframes from a custom sub-shot detection method. The resulting classifications are fed into a Lucene index in order to obtain the shots that match the query. We also discuss our results and point out potentials for further improvements.}, language = {EN}, location = {Gaithersburg, MD, USA}, talkdate = {2016.11.15}, talktype = {poster} } @InProceedings{Muenzer2016, author = {Münzer, Bernd and Schoeffmann, Klaus and Böszörmenyi, Laszlo}, booktitle = {29th International Symposium on Computer-Based Medical Systems (CBMS'16)}, title = {Domain-Specific Video Compression for Long-term Archiving of Endoscopic Surgery Videos}, year = {2016}, address = {Dublin, Ireland}, editor = {Kane, B and Marshall, A and Soda, P}, month = {jun}, pages = {312-317}, publisher = {IEEE}, doi = {10.1109/CBMS.2016.28}, language = {EN}, location = {Dublin}, talkdate = {2016.06.23}, talktype = {registered} } @Article{Zaharieva_IEEEMM2015, author = {Zaharieva, Maia and Del Fabro, Manfred and Zeppelzauer, Matthias}, journal = {IEEE MultiMedia}, title = {Cross-Platform Social Event Detection}, year = {2015}, month = {jun}, number = {99}, pages = {1--15}, volume = {PP}, address = {New York, NY, USA}, language = {EN}, publisher = {IEEE} } @InProceedings{Zaharieva_ICMR2015, author = {Zaharieva, Maia and Zeppelzauer, Matthias and Del Fabro, Manfred and Schopfhauser, Daniel}, booktitle = {Proceedings of the 5th ACM International Conference on Multimedia Retrieval}, title = {Social Event Mining in Large Photo Collections}, year = {2015}, address = {Shanghai, China}, editor = {Li, Xirong and Zhou, Xiangdong}, month = {jun}, pages = {1--8}, publisher = {ACM}, language = {EN}, talktype = {none} } @InProceedings{Taschwer2015, author = {Taschwer, Mario and Marques, Oge}, booktitle = {{CLEF} 2015 Working Notes}, title = {AAUITEC at ImageCLEF 2015: Compound Figure Separation}, year = {2015}, address = {Padova, Italy}, editor = {Capellato, Linda and Ferro, Nicola and Jones, Gareth and Juan, Eric}, month = {sep}, pages = {9}, publisher = {CLEF Association}, series = {CEUR Workshop Proceedings, ISSN 1613-0073}, volume = {1391}, abstract = {Our approach to automatically separating compound figures appearing in biomedical articles is split into two image processing algorithms: one is based on detecting separator edges, and the other tries to identify background bands separating sub gures. Only one algorithm is applied to a given image, according to the prediction of a binary classifier trained to distinguish graphical illustrations from other images in biomedical articles. Our submission to the ImageCLEF 2015 compound figure separation task achieved an accuracy of 49% on the provided test set of about 3400 compound images. This stays clearly behind the best submission of other participants (85% accuracy), but is by an order of magnitude faster than other approaches reported in the literature.}, language = {EN}, location = {Toulouse, France}, pdf = {https://www.itec.aau.at/bib/files/aauitec-fig-separation.pdf}, slides = {https://www.itec.aau.at/bib/files/poster-aauitec-fig-separation.pdf}, talkdate = {2015.09.09}, talktype = {poster}, url = {http://ceur-ws.org/Vol-1391/25-CR.pdf} } @InProceedings{Primus_CBMI2015, author = {Primus, Manfred Jürgen and Schoeffmann, Klaus and Böszörmenyi, Laszlo}, booktitle = {13th International Workshop on Content-Based Multimedia Indexing}, title = {Instrument Classification in Laparoscopic Videos}, year = {2015}, address = {Los Alamitos, CA, USA}, editor = {Skopal, Tomas and Lokoc, Jakub}, month = {jun}, pages = {1--6}, publisher = {IEEE Computer Society}, abstract = {In medical endoscopy more and more surgeons record videos of their interventions in a long-term storage archive for later retrieval. In order to allow content-based search in such endoscopic video archives, the video data needs to be indexed first. However, even the very basic step of content-based indexing, namely content segmentation, is already very challenging due to the special characteristics of such video data. Therefore, we propose to use instrument classification to enable semantic segmentation of laparoscopic videos. In this paper, we evaluate the performance of such an instrument classification approach. Our results show satisfying performance for all instruments used in our evaluation.}, doi = {10.1109/CBMI.2015.7153616}, isbn10 = {978-1-4673-6870-4}, language = {EN}, location = {Prague, Czech Republic}, talkdate = {2015.06.12}, talktype = {registered}, url = {http://siret.ms.mff.cuni.cz/cbmi2015/} } @InProceedings{Lokoc2015, author = {Lokoc, Jakub and Münzer, Bernd and Schoeffmann, Klaus and del Fabro, Manfred and Primus, Manfred Jürgen and Skopal, Tomas and Lansky, Jan}, booktitle = {Proceedings of the 2015 IEEE International Conference on Multimedia \& Expo Workshops (ICMEW)}, title = {What are the Salient Keyframes in Short Casual Videos? An Extensive User Study using a new Video Dataset}, year = {2015}, address = {Los Alamitos, CA}, editor = {Cesana, Matteo}, month = {jun}, pages = {1-6}, publisher = {IEEE}, language = {EN}, location = {Turin, Italy}, talkdate = {2015.06.29}, talktype = {registered} } @InProceedings{ZaharievaSEM2014, author = {Zaharieva, M and Riegler, M and Del Fabro, M}, booktitle = {Working Notes Proceedings of the MediaEval 2014 Workshop}, title = {Multimodal Synchronization of Image Galleries}, year = {2014}, address = {Vol-1263}, editor = {De Natale, F and Mezaris, V and Conci, N}, month = {oct}, pages = {1--2}, publisher = {CEUR-WS}, language = {EN}, location = {Barcelona, Spain}, talkdate = {2014.10.16}, talktype = {registered} } @InProceedings{ZaharievaSED2014, author = {Zaharieva, M and Schopfhauser, M and Del Fabro, M and Zeppelzauer, M}, booktitle = {Working Notes Proceedings of the MediaEval 2014 Workshop}, title = {Clustering and Retrieval of Social Events in Flickr}, year = {2014}, address = {Vol-1263}, editor = {Petkos, G and Papadopoulos, S and Rizzo, G and Mezaris, V and Troncy, R}, month = {oct}, pages = {1--2}, publisher = {CEUR-WS}, language = {EN}, location = {Barcelona, Spain}, talkdate = {2014.10.16}, talktype = {registered} } @InProceedings{Taschwer2014a, author = {Taschwer, Mario}, booktitle = {Proceedings of the ACM International Conference on Multimedia}, title = {Medical Case Retrieval}, year = {2014}, address = {New York, NY, USA}, editor = {n/a, n/a}, month = {nov}, pages = {639--642}, publisher = {ACM}, series = {MM '14}, doi = {10.1145/2647868.2654856}, isbn13 = {978-1-4503-3063-3}, keywords = {biomedical information retrieval, ImageCLEF medical tasks, multimodal information retrieval}, language = {EN}, location = {Orlando, Florida, USA}, pdf = {https://www.itec.aau.at/bib/files/Taschwer_ACM_MM_2014.pdf}, slides = {https://www.itec.aau.at/bib/files/Taschwer_ACM_MM_2014_slides.pdf}, talkdate = {2014.11.05}, talktype = {registered} } @TechReport{Taschwer2014, author = {Taschwer, Mario}, institution = {Institute of Information Technology (ITEC), Alpen-Adria-Universit\"{a}t}, title = {Textual Methods for Medical Case Retrieval}, year = {2014}, address = {Klagenfurt, Austria}, month = {may}, number = {TR/ITEC/14/2.01}, abstract = {Medical case retrieval (MCR) is information retrieval in a collection of medical case descriptions, where descriptions of patients' symptoms are used as queries. We apply known text retrieval techniques based on query and document expansion to this problem, and combine them with new algorithms to match queries and documents with Medical Subject Headings (MeSH). We ran comprehensive experiments to evaluate 546 method combinations on the ImageCLEF 2013 MCR dataset. Methods combining MeSH query expansion with pseudo-relevance feedback performed best, delivering retrieval performance comparable to or slightly better than the best MCR run submitted to ImageCLEF 2013.}, language = {EN}, pages = {50}, pdf = {https://www.itec.aau.at/bib/files/textual-mcr.pdf} } @InProceedings{Muenzer2014, author = {Münzer, Bernd and Schoeffmann, Klaus and Böszörmenyi, Laszlo and Smulders, Johannes Franciscus and Jakimowicz, Jack J}, booktitle = {27th International Symposium on Computer-Based Medical Systems (CBMS'14)}, title = {Investigation of the Impact of Compression on the Perceptional Quality of Laparoscopic Videos}, year = {2014}, address = {New York City, USA}, editor = {Krol, Marina}, month = {may}, pages = {153-158}, publisher = {IEEE}, language = {EN}, location = {New York City, USA}, talkdate = {2014.05.27}, talktype = {registered} } @InProceedings{CobarzanVBS2014, author = {Cobarzan, Claudiu and Hudelist, Marco Andrea and Del Fabro, Manfred}, booktitle = {MultiMedia Modeling, 20th Anniversary International Conference}, title = {Content-Based Video Browsing with Collaborating Mobile Clients}, year = {2014}, address = {Berlin, Germany}, editor = {Gurrin, C and Hopfgartner, F and Hurst, W and Johansen, H and Lee, H and O'Connor, N}, month = {jan}, pages = {402-406}, publisher = {Springer}, language = {EN}, location = {Dublin, Ireland}, talkdate = {2014.01.07}, talktype = {poster} } @Article{delfabro_mmsj2013, author = {Del Fabro, Manfred and Böszörmenyi, Laszlo}, journal = {Multimedia Systems}, title = {State-of-the-art and future challenges in video scene detection: a survey}, year = {2013}, issn = {0942-4962}, month = {feb}, number = {5}, pages = {427-454}, volume = {19}, address = {Berlin, Heidelberg, New York}, language = {EN}, publisher = {Springer-Verlag} } @InProceedings{Zeppelzauer_MediaEval2013, author = {Zeppelzauer, Matthias and Zaharieva, Maia and Del Fabro, Manfred}, booktitle = {MediaEval 2013 - Multimedia Benchmark Workshop}, title = {Unsupervised Clustering of Social Events}, year = {2013}, address = {Aachen, Germany}, editor = {Larson, Martha and Anguera, Xavier and Reuter, Timo and Jones, Gareth and Ionescu, Bogdan and Schedl, Markus and Piatrik, Tomas and Hauff, Claudia and Soleymani, Mohammad}, month = {oct}, pages = {1--2}, publisher = {CEUR-WS.org/Vol-1043}, language = {EN}, location = {Barcelona, Spain}, pdf = {https://www.itec.aau.at/bib/files/mediaeval2013_submission_37.pdf}, talkdate = {2013.10.19}, talktype = {poster} } @InProceedings{Taschwer2013, author = {Taschwer, Mario}, booktitle = {{CLEF} 2013 Evaluation Labs and Workshop, Online Working Notes}, title = {Text-Based Medical Case Retrieval Using {MeSH} Ontology}, year = {2013}, address = {Padua, Italy}, editor = {Forner, Pamela and Navigli, Roberto and Tufis, Dan}, month = {sep}, pages = {5}, publisher = {CLEF Initiative}, abstract = {Our approach to the ImageCLEF medical case retrieval task consists of text-only retrieval combined with utilizing the Medical Subject Headings (MeSH) ontology. MeSH terms extracted from the query are used for query expansion or query term weighting. MeSH annotations of documents available from PubMed Central are added to the corpus. Retrieval results improve slightly upon full-text retrieval.}, isbn13 = {978-88-904810-5-5}, language = {EN}, location = {Valencia, Spain}, pdf = {https://www.itec.aau.at/bib/files/aau_mcr_mesh.pdf}, slides = {https://www.itec.aau.at/bib/files/poster_clef2013.pdf}, talkdate = {2013.09.24}, talktype = {poster}, url = {http://www.clef-initiative.eu/documents/71612/4b93fc08-a8fa-4985-873d-c2c18bd4cd3d} } @Article{SchoeffmannIJMIR2013, author = {Schoeffmann, Klaus and Ahlström, David and Bailer, Werner and Cobarzan, Claudiu and Hopfgartner, Frank and McGuinness, Kevin and Gurrin, Cathal and Frisson, Christian and Le, Duy-Dinh and Del Fabro, Manfred and Bai, Hongliang and Weiss, Wolfgang}, journal = {International Journal of Multimedia Information Retrieval}, title = {The Video Browser Showdown: a live evaluation of interactive video search tools}, year = {2013}, month = {dec}, pages = {1-15}, address = {Berlin, Germany}, language = {EN}, publisher = {Springer} } @InProceedings{Primus_CBMI2013, author = {Primus, Manfred Jürgen and Schoeffmann, Klaus and Böszörmenyi, Laszlo}, booktitle = {11th International Workshop on Content-Based Multimedia Indexing}, title = {Segmentation of Recorded Endoscopic Videos by Detecting Significant Motion Changes}, year = {2013}, address = {Los Alamitos, CA, USA}, editor = {Czuni, Laszlo}, month = {jun}, pages = {223--228}, publisher = {IEEE Computer Society}, abstract = {In the medical domain it has become common to store recordings of endoscopic surgeries or procedures. The storage of these endoscopic videos provides not only evidence of the work of the surgeons but also facilitates research, the training of new surgeons and supports explanations to the patients. However, an endoscopic video archive, where tens or hundreds of new videos are added each day, needs content-based analysis in order to provide content-based search. A fundamental first step in content analysis is the segmentation of the video. We propose a new method for segmentation of endoscopic videos, based on spatial and temporal differences of motion in these videos. Through an evaluation with 20 videos we show that our approach provides reasonable performance.}, language = {EN}, location = {Veszprem, Hungary}, pdf = {https://www.itec.aau.at/bib/files/CBMI_2013_39.pdf}, talkdate = {2013.06.18}, talktype = {registered} } @InProceedings{Muenzer2013b, author = {Münzer, Bernd and Schoeffmann, Klaus and Böszörmenyi, Laszlo}, booktitle = {IEEE International Symposium on Multimedia (ISM2013)}, title = {Relevance Segmentation of Laparoscopic Videos}, year = {2013}, address = {Anaheim, CA, USA}, editor = {Liao, Anthony Y H}, month = {dec}, pages = {84-91}, publisher = {IEEE}, abstract = {In recent years, it became common to record video footage of laparoscopic surgeries. This leads to large video archives that are very hard to manage. They often contain a considerable portion of completely irrelevant scenes which waste storage capacity and hamper an efficient retrieval of relevant scenes. In this paper we (1) define three classes of irrelevant segments, (2) propose visual feature extraction methods to obtain irrelevance indicators for each class and (3) present an extensible framework to detect irrelevant segments in laparoscopic videos. The framework includes a training component that learns a prediction model using nonlinear regression with a generalized logistic function and a segment composition algorithm that derives segment boundaries from the fuzzy frame classifications. The experimental results show that our method performs very good both for the classification of individual frames and the detection of segment boundaries in videos and enables considerable storage space savings.}, language = {DE}, location = {Anaheim, CA, USA}, talkdate = {2013.12.11}, talktype = {registered} } @InProceedings{Muenzer2013a, author = {Münzer, Bernd and Schoeffmann, Klaus and Böszörmenyi, Laszlo}, booktitle = {Proceedings of the IEEE International Conference on Multimedia and Expo (ICME) 2013}, title = {Improving Encoding Efficiency of Endoscopic Videos by using Circle Detection based Border Overlays}, year = {2013}, address = {San Jose, USA}, editor = {Zabulis, Xenophon}, month = {jul}, pages = {1-4}, publisher = {IEEE}, abstract = {Videos of endoscopic procedures typically feature a circular content area in the image center. This area is surrounded by a dark border that carries no relevant information but is subject to noise. Thus, a considerable proportion of the available bitrate has to be wasted to encode the border regions. We propose to superimpose the border regions with a homogenous black mask so that it can be encoded efficiently with skipped macroblocks. To determine the exact position and size of the circular content area we use an efficient circle detection algorithm. Through an evaluation with 138 videos we show that the border overlay can significantly reduce the bitrate without degrading the visual quality of the content area.}, doi = {10.1109/ICMEW.2013.6618304}, language = {EN}, location = {San Jose, USA}, talkdate = {2013.07.18}, talktype = {poster} } @InProceedings{Muenzer2013, author = {Münzer, Bernd and Schoeffmann, Klaus and Böszörmenyi, Laszlo}, booktitle = {26th International Symposium on Computer-Based Medical Systems (CBMS'13)}, title = {Detection of Circular Content Area in Endoscopic Videos}, year = {2013}, address = {Porto, Portugal}, editor = {Soda, Paolo}, month = {jun}, pages = {534-536}, publisher = {IEEE}, abstract = {The actual content of endoscopic videos is typically limited to a circular area in the image center. This area has a dynamic position and size and is surrounded by a dark, but noisy border. In this paper we present a novel algorithm that (1) classifies which frames of an endoscopic video feature the circular content area and (2) determines its exact position and size, if present. This information is very useful for improving the performance of subsequent analysis techniques. It can also be used for more efficient video encoding and economic printing of still images in findings and reports. The evaluation shows that the proposed method is very accurate, robust and efficient in terms of runtime.}, doi = {10.1109/CBMS.2013.6627865}, language = {EN}, location = {Porto, Portugal}, talkdate = {2013.06.20}, talktype = {poster} } @InProceedings{HudelistISM2013, author = {Hudelist, Marco Andrea and Schoeffmann, Klaus and Ahlström, David}, booktitle = {IEEE International Symposium on Multimedia (ISM2013)}, title = {Evaluation of Image Browsing Interfaces for Smartphones and Tablets}, year = {2013}, address = {Los Alamitos, CA, USA}, editor = {Friedland, Gerald and Liu, Zhu and Steinmetz, Nadine}, month = {dec}, pages = {8}, publisher = {IEEE}, language = {EN}, location = {Anaheim, CA, USA}, talkdate = {2013.12.09}, talktype = {registered} } @InProceedings{DelFabro_CBMI2013, author = {Del Fabro, Manfred and Schoeffmann, Klaus and Guggenberger, Mario and Taschwer, Mario}, booktitle = {11th International Workshop on Content-Based Multimedia Indexing}, title = {A Filtering Tool to Support Interactive Search in Internet Video Archives}, year = {2013}, address = {Los Alamitos, CA, USA}, editor = {Czuni, Laszlo}, month = {jun}, pages = {7--10}, publisher = {IEEE Computer Society}, language = {EN}, location = {Veszprem, Hungary}, talkdate = {2013.06.18}, talktype = {poster} } @InProceedings{DelFabro2013a, author = {Del Fabro, Manfred and Münzer, Bernd and Böszörmenyi, Laszlo}, booktitle = {Advances in Multimedia Modeling}, title = {AAU Video Browser with Augmented Navigation Bars}, year = {2013}, address = {Berlin Heidelberg}, editor = {Li, Shipeng and El-Saddik, Abdulmotaleb and Wang, Meng and Mei, Tao and Sebe, Nicu and Yan, Shuicheng and Hong, Richang and Gurrin, Cathal}, month = {jan}, pages = {544-546}, publisher = {Springer}, series = {Lecture Notes in Computer Science Volume 7733}, abstract = {We present an improved version of last year’s winner of the Video Browser Showdown. In a preprocessing step video segments are detected and clustered in several latent classes of similar content based on color and motion information. The navigation bars of our video browser are then augmented with different colors indicating where elements of the detected clusters are located. As humans are able to classify the content of clusters fast, they can benefit from this information when browsing through a video.}, doi = {10.1007/978-3-642-35728-2_9}, isbn10 = {978-3-642-35727-5}, isbn13 = {978-3-642-35728-2}, language = {EN}, location = {Huangshan, China}, subtitle = {19th International Conference, MMM 2013, Huangshan, China, January 7-9, 2013, Proceedings, Part II}, talkdate = {2013.01.08}, talktype = {poster} } @InProceedings{DelFabro2013, author = {Del Fabro, Manfred and Münzer, Bernd and Böszörmenyi, Laszlo}, booktitle = {Advances in Multimedia Modeling}, title = {Smart Video Browsing With Augmented Navigation Bars}, year = {2013}, address = {Berlin Heidelberg}, editor = {Li, Shipeng and El-Saddik, Abdulmotaleb and Wang, Meng and Mei, Tao and Sebe, Nicu and Yan, Shuicheng and Hong, Richang and Gurrin, Cathal}, month = {jan}, pages = {88-98}, publisher = {Springer}, series = {Lecture Notes in Computer Science Volume 7733}, abstract = {While accuracy and speed get a lot of attention in video retrieval research, the investigation of interactive retrieval tools gets less attention and is often regarded as trivial. We want to show that even simple ideas have potential to improve the retrieval performance by giving some automated support to the browsing user. We present a video browsing concept where video segments are clustered in several latent classes of similar content. The navigation bars of our video browser are augmented with different colors indicating where elements of these clusters are located. As humans are able to classify the content of clusters fast, they can benefit from this information when browsing a video. We present a study where we investigated how humans can be supported in different video browsing tasks with a color-based and a motion-based clustering of video content.}, doi = {10.1007/978-3-642-35728-2_9}, isbn10 = {978-3-642-35727-5}, isbn13 = {978-3-642-35728-2}, language = {EN}, location = {Huangshan, China}, subtitle = {19th International Conference, MMM 2013, Huangshan, China, January 7-9, 2013, Proceedings, Part II}, talkdate = {2013.01.08}, talktype = {registered} } @InProceedings{Bailer2013, author = {Bailer, Werner and Schoeffmann, Klaus and Ahlström, David and Weiss, Wolfgang and Del Fabro, Manfred}, booktitle = {Advances in Multimedia Modeling}, title = {Interactive Evaluation of Video Browsing Tools}, year = {2013}, address = {Berlin Heidelberg}, editor = {Li, Shipeng and El-Saddik, Abdulmotaleb and Wang, Meng and Mei, Tao and Sebe, Nicu and Yan, Shuicheng and Hong, Richang and Gurrin, Cathal}, month = {jan}, pages = {81-91}, publisher = {Springer}, series = {Lecture Notes in Computer Science Volume 7732}, abstract = {The Video Browser Showdown (VBS) is a live competition for evaluating video browsing tools regarding their efficiency at known-item search (KIS) tasks. The first VBS was held at MMM 2012 with eight teams working on 14 tasks, of which eight were completed by expert users and six by novices. We describe the details of the competition, analyze results regarding the performance of tools, the differences between the tasks and the nature of the false submissions.}, doi = {10.1007/978-3-642-35728-2_9}, isbn10 = {978-3-642-35724-4}, isbn13 = {978-3-642-35725-1}, language = {EN}, location = {Huangshan, China}, subtitle = {19th International Conference, MMM 2013, Huangshan, China, January 7-9, 2013, Proceedings, Part I}, talkdate = {2013.01.07}, talktype = {registered} } @InProceedings{lux2012did, author = {Lux, Mathias and Huber, Jochen}, booktitle = {Image Analysis for Multimedia Interactive Services (WIAMIS), 2012 13th International Workshop on}, title = {Why did you record this video? An exploratory study on user intentions for video production}, year = {2012}, address = {Los Alamitos, CA, USA}, editor = {O'Connor, Noel and Daras, Petros and Pereira, Fernando}, month = {jan}, organization = {IEEE}, pages = {1-4}, publisher = {IEEE}, abstract = {Why do people record videos and share them? While the question seems to be simple, user intentions have not yet been investigated for video production and sharing. A general taxonomy would lead to adapted information systems and multimedia interfaces tailored to the users' intentions. We contribute (1) an exploratory user study with 20 participants, examining the various facets of user intentions for video production and sharing in detail and (2) a novel set of user intention clusters for video production, grounded empirically in our study results. We further reflect existing work in specialized domains (i.e. video blogging and mobile phone cameras) and show that prevailing models used in other multimedia fields (e.g. photography) cannot be used as-is to reason about video recording and sharing intentions.}, doi = {10.1109/WIAMIS.2012.6226758}, isbn10 = {978-1-4673-0789-5}, isbn13 = {978-1-4673-0791-8}, issn = {2158-5873}, keywords = {Communication, Networking & Broadcasting ; Components, Circuits, Devices & Systems ; Computing & Processing (Hardware/Software) ; Signal Processing & Analysis}, language = {EN}, location = {Dublin, Ireland}, talkdate = {2012.05.25}, talktype = {registered} } @InProceedings{Taschwer2012, author = {Taschwer, Mario}, booktitle = {Advances in Multimedia Modeling}, title = {A Key-Frame-Oriented Video Browser}, year = {2012}, address = {Berlin / Heidelberg}, editor = {Schoeffmann, Klaus and Merialdo, Bernard and Hauptmann, Alexander and Ngo, Chong-Wah and Andreopoulos, Yiannis and Breiteneder, Christian}, month = {jan}, pages = {655-657}, publisher = {Springer}, series = {Lecture Notes in Computer Science}, volume = {7131}, abstract = {We propose a video browser facilitating known-item search in a single video. Key frames are presented as four images at a time and can be navigated quickly in both forward and backward directions using a slider. Alternatively, key frames can be displayed automatically at different frame rates. The user may choose between three mappings of key frames to the four key frame widgets based on video time stamps and color similarity.}, doi = {10.1007/978-3-642-27355-1_68}, isbn13 = {978-3-642-27354-4}, language = {EN}, location = {Klagenfurt}, talkdate = {2012.01.06}, talktype = {poster}, url = {http://dx.doi.org/10.1007/978-3-642-27355-1_68} } @InProceedings{SobeEMCS2012, author = {Sobe, Anita and Elmenreich, Wilfried and Del Fabro, Manfred}, booktitle = {European Meeting on Cybernetics and Systems Research Book of Abstracts}, title = {Self-organizing content sharing at social events}, year = {2012}, address = {Vienna}, editor = {Bichler, Robert and Blachfellner, Stefan and Hofkirchner, Wolfgang}, month = {apr}, pages = {197--200}, publisher = {EMCSR}, language = {EN}, location = {Vienna, Austria}, talkdate = {2012.04.11}, talktype = {registered}, url = {http://www.emcsr.net/wp-content/uploads/2012/EMCSR_Book_of_Abstracts_V2.pdf} } @InProceedings{SchoeffmannWIAMIS2012, author = {Schoeffmann, Klaus and Ahlström, David}, booktitle = {Proceedings of The 13th International Workshop on Image Analysis for Multimedia Interactive Services ({WIAMIS} 2012)}, title = {Using a Cylindrical Interface for Image Browsing to Improve Visual Search Performance}, year = {2012}, address = {Los Alamitos, CA, USA}, editor = {O'Connor, Noel and Daras, Petros and Pereira, Fernando}, month = {may}, pages = {1-4}, publisher = {IEEE}, abstract = {In this paper we evaluate a 3D cylindrical interface that arranges image thumbnails by visual similarity for the purpose of image browsing. Through a user study we compare the performance of this interface to the performance of a common scrollable 2D list of thumbnails in a grid arrangement. Our evaluation shows that the 3D Cylinder interface enables significantly faster visual search and is the preferred search interface for the majority of tested users.}, language = {EN}, location = {Dublin, Ireland}, talkdate = {2012.05.23}, talktype = {registered} } @InProceedings{SchoeffmannMMM12, author = {Schoeffmann, Klaus and Ahlström, David and Böszörmenyi, Laszlo}, booktitle = {Advances in Multimedia Modeling}, title = {Video Browsing with a 3D Thumbnail Ring Arranged by Color Similarity}, year = {2012}, address = {Berlin, Heidelberg, New York}, editor = {Schoeffmann, Klaus and Merialdo, Bernard and Hauptmann, Alexander and Ngo, Chong-Wah and Andreopoulos, Yiannis and Breiteneder, Christian}, month = {jan}, pages = {660--662}, publisher = {Springer}, language = {EN}, location = {Klagenfurt, Austria}, talkdate = {2012.01.06}, talktype = {poster} } @InProceedings{SchoeffmannICMR2012, author = {Schoeffmann, Klaus and Hudelist, Marco Andrea and Schaefer, Gerald and Del Fabro, Manfred}, booktitle = {Proceedings of the 2nd ACM International Conference on Multimedia Retrieval}, title = {Mobile Image Browsing on a 3D Globe}, year = {2012}, address = {New York, NY, USA}, editor = {Horace, H S Ip and Rui, Yong}, month = {jun}, pages = {61:1--61:2}, publisher = {ACM}, abstract = {With users increasingly using their mobile devices such as smartphones as digital photo albums, effective methods for managing these collections are becoming increasingly important. Standard solutions provide only limited facilities for organising, browsing and searching image collections on mobile devices, making it challenging and time-consuming to locate images of interest. In this demo paper, we present an intuitive interface for organising and browsing image collections on mobile devices. Images are arranged on a 3D globe according to colour similarity. To avoid image overlap image thumbnails are placed on a regular grid structure while large image collections are organised using a hierarchical data structure. Through multi-touch user interaction image browsing can be performed in an intuitive and effective manner.}, doi = {10.1145/2324796.2324866}, isbn10 = {978-1-4503-1329-2}, language = {EN}, location = {Hong Kong, China}, talkdate = {2012.06.08}, talktype = {poster}, url = {http://dl.acm.org/citation.cfm?id=2324866} } @InProceedings{SchoeffmannICME2012_1, author = {Schoeffmann, Klaus and Ahlström, David and Böszörmenyi, Laszlo}, booktitle = {Proceedings of the {IEEE} International Conference on Multimedia and Expo ({ICME} 2012)}, title = {3D Storyboards for Interactive Visual Search}, year = {2012}, address = {Los Alamitos, CA, USA}, editor = {Zhang, Jian and Schonfeld, Dan and Feng, David Dagan and Nanyang, Jianfei Cai and Hanjalic, Alan and Magli, Enrico and Pickering, Mark and Friedland, Gerald and Hua, Xian-Sheng}, month = {July}, pages = {848-853}, publisher = {IEEE Computer Society}, abstract = {Interactive image and video search tools typically use a grid-like arrangement of thumbnails for preview purpose. Such a display, which is commonly known as storyboard, provides limited flexibility at interactive search and it does not optimally exploit the available screen estate. In this paper we design and evaluate alternatives to the common two-dimensional storyboard. We take advantage of 3D graphics in order to present image thumbnails in cylindrical arrangements. Through a user study we evaluate the performance of these interfaces in terms of visual search time and subjective performance.}, language = {EN}, location = {Melbourne, Australia}, talkdate = {2012.07.12}, talktype = {registered} } @InProceedings{Muller2012, author = {Müller, Alexander and Lux, Mathias and Böszörmenyi, Laszlo}, booktitle = {Proceedings of the 12th International Conference on Knowledge Management and Knowledge Technologies}, title = {The video summary GWAP: summarization of videos based on a social game}, year = {2012}, address = {New York, NY, USA}, editor = {Lindstaedt, Stefanie and Granitzer, Michael}, month = {jan}, pages = {15:1--15:7}, publisher = {ACM}, series = {i-KNOW '12}, doi = {10.1145/2362456.2362476}, keywords = {games with a purpose, human computation, video retrieval, video summarization}, language = {EN}, talktype = {none}, url = {http://doi.acm.org/10.1145/2362456.2362476} } @TechReport{Muenzer2012, author = {Münzer, Bernd and Schoeffmann, Klaus and Böszörmenyi, Laszlo}, institution = {Institute of Information Technology ({ITEC}), Klagenfurt University}, title = {Detection of Circular Content Area in Endoscopic Videos for Efficient Encoding and Improved Content Analysis}, year = {2012}, address = {Klagenfurt, Austria}, month = {nov}, number = {TR/ITEC/12/2.03}, abstract = {The actual content of endoscopic videos is typically limited to a circular area in the center of the image due to the inherent characteristics of the camera. This area is surrounded by a dark border that fills up the remainder of the rectangular image and is subject to noise. The position and size of the circle is not standardized and usually varies over time. In this paper a robust algorithm is presented that (1) classifies which parts of an endoscopic video feature a circular content area and (2) determines its exact position and size, if present. This information is useful for improving video encoding efficiency, limiting further analysis steps to the relevant area and saving ink when printing still images on findings. Our evaluation shows that the proposed method is very fast, reliable and robust. Moreover, it indicates that by exploiting this information for video encoding a considerable bitrate reduction is possible with the same visual quality.}, language = {EN}, pages = {20}, pdf = {https://www.itec.aau.at/bib/files/CircleDetection.pdf} } @InProceedings{MuellerICME2012, author = {Mueller, Christopher and Smole, Martin and Schoeffmann, Klaus}, booktitle = {Proceedings of the IEEE International Conference on Multimedia and Expo (ICME 2012)}, title = {A Demonstration of A Hierarchical Multi-Layout 3D Video Browser}, year = {2012}, address = {Los Alamitos, CA, USA}, editor = {Zhang, Jian and Schonfeld, Dan and Feng, David Dagan and Nanyang, Jianfei Cai and Hanjalic, Alan and Magli, Enrico and Pickering, Mark and Friedland, Gerald and Hua, Xian-Sheng}, month = {jul}, pages = {665}, publisher = {IEEE Computer Society}, abstract = {This paper demonstrates a novel 3D Video Browser (3VB) that enables interactive search within a single video as well as video collections by utilizing 3D projection and an intuitive interaction. The browsing approach is based on hierarchical search, which means that the user can split a video into several segments. The 3VB disposes a convenient interface that allows flexible arrangement of video segments in the 3D space. It allows for concurrent playback of video segments and flexible inspection of these segments at any desired level of detail through convenient user interaction.}, language = {EN}, location = {Melbourne, Australia}, pdf = {https://www.itec.aau.at/bib/files/A_Demo_of_a_Hierarchical_Multi-Layout_3D_Video_Browser.pdf}, talkdate = {2012.07.10}, talktype = {registered} } @InProceedings{Marques2012, author = {Marques, Oge and Lux, Mathias}, booktitle = {Proceedings of the 35th international ACM SIGIR conference on Research and development in information retrieval}, title = {Visual information retrieval using Java and LIRE}, year = {2012}, address = {New York, NY, USA}, editor = {Hersh, William and Callan, Jamie and Maarek, Yoelle and Sanderson, Mark}, month = {jan}, pages = {1193--1193}, publisher = {ACM}, series = {SIGIR '12}, doi = {10.1145/2348283.2348538}, keywords = {content-based image retrieval, image search, java, visual information retrieval}, language = {EN}, location = {Portland, Oregon, USA}, talkdate = {2012.08.12}, talktype = {registered}, url = {http://doi.acm.org/10.1145/2348283.2348538} } @InProceedings{Lux2012b, author = {Lux, Mathias and Taschwer, Mario and Marques, Oge}, booktitle = {Proceedings of the 20th ACM international conference on Multimedia}, title = {Classification of photos based on good feelings: ACM MM 2012 multimedia grand challenge submission}, year = {2012}, address = {New York, NY, USA}, editor = {Aizawa, Kiyoharu and Babaguchi, Noboru and Smith, John}, month = {jan}, pages = {1367--1368}, publisher = {ACM}, series = {MM '12}, doi = {10.1145/2393347.2396488}, keywords = {affection, image classification, image search, user intentions}, language = {EN}, location = {Nara, Japan}, talkdate = {2012.11.01}, talktype = {registered}, url = {http://doi.acm.org/10.1145/2393347.2396488} } @InProceedings{Lux2012a, author = {Lux, Mathias and Taschwer, Mario and Marques, Oge}, booktitle = {Proceedings of the ACM multimedia 2012 workshop on Crowdsourcing for multimedia}, title = {A closer look at photographers' intentions: a test dataset}, year = {2012}, address = {New York, NY, USA}, editor = {Aizawa, Kiyoharu and Babaguchi, Noboru and Smith, John}, month = {jan}, pages = {17--18}, publisher = {ACM}, series = {CrowdMM '12}, doi = {10.1145/2390803.2390811}, keywords = {digital photos, user intentions}, language = {EN}, location = {Nara, Japan}, talkdate = {2012.10.29}, talktype = {registered}, url = {http://doi.acm.org/10.1145/2390803.2390811} } @InProceedings{Lux2012, author = {Lux, Mathias and Guggenberger, Mario and Müller, Alexander}, booktitle = {Proceedings of the Eighth Artificial Intelligence and Interactive Digital Entertainment International Conference (AIIDE 2012)}, title = {Finding Image Regions with Human Computation and Games with a Purpose}, year = {2012}, address = {Palo Alto, California, USA}, editor = {Riedl, Mark and Sukthankar, Gita}, month = {jan}, pages = {220}, publisher = {Association for the Advancement of Artificial Intelligence (AAAI Press)}, abstract = {Manual image annotation is a tedious and time-consuming task, while automated methods are error prone and limited in their results. Human computation, and especially games with a purpose, have shown potential to create high quality annotations by "hiding the complexity" of the actual annotation task and employing the "wisdom of the crowds". In this demo paper we present two games with a single purpose: finding regions in images that correspond to given terms. We discuss approach, implementation, and preliminary results of our work and give an outlook to immediate future work.}, isbn10 = {978-1-57735-582-3}, keywords = {Games with a Purpose; Human Computation}, language = {EN}, talktype = {none}, url = {http://www.aaai.org/ocs/index.php/AIIDE/AIIDE12/paper/view/5474} } @InProceedings{Kogler2012, author = {Kogler, Marian and Lux, Mathias}, booktitle = {i-KNOW '12 Proceedings of the 12th International Conference on Knowledge Management and Knowledge Technologies}, title = {Robust image retrieval using bag of visual words with fuzzy codebooks and fuzzy assignment}, year = {2012}, address = {New York, NY, USA}, editor = {Lindstaedt, Stefanie}, month = {jan}, pages = {34.1 - 34.4}, publisher = {ACM}, series = {i-KNOW '12}, abstract = {Content-based retrieval systems leverage low level features such as color, texture or local information of images to find similar images to a respective query image. In recent years the Bag of Visual Words (BoVW) approach, which relies on quantized visual information around local image patches, has gained importance in image retrieval. In this paper we focus on fuzzy algorithms, in order to improve the descriptiveness of image descriptors. We extend the BoVW approach by applying fuzzy clustering and fuzzy assignment to take a step towards more effective visual descriptors, which are matched against each other in content-based similarity searches.}, doi = {10.1145/2362456.2362498}, keywords = {bag of visual words, content based image retrieval, fuzzy, visual information retrieval}, language = {EN}, talktype = {none}, url = {http://doi.acm.org/10.1145/2362456.2362498} } @InProceedings{DelFabro2012c, author = {Del Fabro, Manfred and Lux, Mathias and Schoeffmann, Klaus and Taschwer, Mario}, booktitle = {Proceedings of TRECVID 2012}, title = {ITEC-UNIKLU Known-Item Search Submission 2012}, year = {2012}, address = {Gaithersburg, USA}, editor = {Over, Paul and Awad, George and Michel, Martial and Fiscus, Jonathan and Sanders, Greg and Shaw, Barbara and Kraaij, Wessel and Smeaton, Alan and Quénot, Georges}, month = {nov}, pages = {11}, publisher = {National Institute of Standards and Technology (NIST)}, abstract = {In this report we describe our approach to the known-item search task for TRECVID~2012. We describe how we index available metadata and how we gain additional information about the videos using content-based analysis. A rule-based query expansion and query reduction method is applied to increase the number of relevant videos in automatic runs. Furthermore, we describe an approach for quick, interactive filtering of large result sets. We outline how the parameters of our system were tuned for the IACC dataset and discuss our TRECVID 2012 KIS results.}, language = {EN}, location = {Gaithersburg, USA}, talkdate = {2012.11.28}, talktype = {poster}, url = {http://www-nlpir.nist.gov/projects/tvpubs/tv.pubs.org.html} } @InProceedings{DelFabro2012b, author = {Del Fabro, Manfred and Sobe, Anita and Böszörmenyi, Laszlo}, booktitle = {Proceedings of the Fourth International Conferences on Advances in Multimedia (MMEDIA 2012)}, title = {Summarization of Real-Life Events Based on Community-Contributed Content}, year = {2012}, address = {France}, editor = {Davies, Philip and Newell, David}, month = {apr}, pages = {119--126}, publisher = {IARIA}, abstract = {In this paper, we investigate whether community-contributed multimedia content can be used to make video summaries of social events. We implemented an event summarization algorithm that uses photos from Flickr and videos from YouTube to compose summaries of well-known society events, which took place in the last three years. The comparison with a manually obtained ground truth shows a good coverage of the most important situations of these events. We do not claim to produce the best summaries possible, which may be compared to the work of a human director, but we analyze what can be achieved with community-contributed content by now.}, isbn13 = {978-1-61208-195-3}, keywords = {video summarization. event summarization. social media. real-life events. video retrieval. image retrieval. multimedia entertainment.}, language = {EN}, location = {Chamonix Mont-Blanc, France}, pdf = {https://www.itec.aau.at/bib/files/mmedia_2012_6_30_40058.pdf}, talkdate = {2012.05.02}, talktype = {registered}, url = {http://www.thinkmind.org/download.php?articleid=mmedia_2012_6_30_40058} } @InProceedings{DelFabro2012a, author = {Del Fabro, Manfred and Böszörmenyi, Laszlo}, booktitle = {Advances in Multimedia Modeling}, title = {{AAU} Video Browser: Non-Sequential Hierarchical Video Browsing without Content Analysis}, year = {2012}, address = {Berlin, Heidelberg, New York}, editor = {Schoeffmann, Klaus and Merialdo, Bernard and Hauptmann, Alexander and Ngo, Chong-Wah and Andreopoulos, Yiannis and Breiteneder, Christian}, month = {jan}, pages = {639--641}, publisher = {Springer}, abstract = {We participate in the Video Browser Showdown with our easy-to-use video browsing tool. It can be used for getting a quick overview of videos as well as for simple Known Item Search (KIS) tasks. It offers a parallel and a tree-like browsing interface for navigating through the content of single videos or even small video collections in a hierarchical, non-sequential manner. We want to validate whether simple KIS tasks can be completed without a time consuming content analysis in advance.}, doi = {10.1007/978-3-642-27355-1_63}, language = {EN}, location = {Klagenfurt, Austria}, pdf = {https://www.itec.aau.at/bib/files/delfabro_mmm2012_VBS.pdf}, talkdate = {2012.01.06}, talktype = {poster} } @InProceedings{DelFabro2012, author = {Del Fabro, Manfred and Böszörmenyi, Laszlo}, booktitle = {Advances in Multimedia Modeling}, title = {Summarization and Presentation of Real-Life Events Using Community-Contributed Content}, year = {2012}, address = {Berlin, Heidelberg, New York}, editor = {Schoeffmann, Klaus and Merialdo, Bernard and Hauptmann, Alexander and Ngo, Chong-Wah and Andreopoulos, Yiannis and Breiteneder, Christian}, month = {jan}, pages = {630--632}, publisher = {Springer}, abstract = {We present an algorithm for the summarization of social events with community-contributed content from Flickr and YouTube. A clustering algorithm groups content related to the searched event. Date information, GPS coordinates, user ratings and visual features are used to select relevant photos and videos. The composed event summaries are presented with our video browser.}, doi = {10.1007/978-3-642-27355-1_60}, language = {EN}, location = {Klagenfurt, Austria}, pdf = {https://www.itec.aau.at/bib/files/submission_145.pdf}, talkdate = {2012.01.05}, talktype = {poster} } @InProceedings{AhlstroemICME2012, author = {Ahlström, David and Schoeffmann, Klaus}, booktitle = {Proceedings of the 2012 {IEEE} International Conference on Multimedia and Expo Workshops}, title = {A Visual Search User Study on the Influences of Aspect Ratio Distortion of Preview Thumbnails}, year = {2012}, address = {Los Alamitos, CA, USA}, editor = {Zhang, Jian and Schonfeld, Dan and Feng, David Dagan and Nanyang, Jianfei Cai and Hanjalic, Alan and Magli, Enrico and Pickering, Mark and Friedland, Gerald and Hua, Xian-Sheng}, month = {jul}, pages = {546-551}, publisher = {IEEE Computing Society}, language = {EN}, location = {Melbourne, Australia}, talkdate = {2012.07.13}, talktype = {registered} } @InProceedings{ACM2012, author = {Ahlström, David and Hudelist, Marco Andrea and Schoeffmann, Klaus and Schaefer, Gerald}, booktitle = {Proceedings of the 20th ACM international conference on Multimedia}, title = {A User Study on Image Browsing on Touchscreens}, year = {2012}, address = {New York, USA}, editor = {Babaguchi, Noboru and Aizawa, Kiyoharu and Smith, John}, month = {nov}, pages = {pp. 925-928}, publisher = {ACM Digital Library}, abstract = {Default image browsing interfaces on touch-based mobile devices provide limited support for image search tasks. To facilitate fast and convenient searches we propose an alternative interface that takes advantage of 3D graphics and arranges images on a rotatable globe according to color similarity. In a user study we compare the new design to the iPad's image browser. Results collected from 24 participants show that for color-sorted image collections the globe can reduce search time by 23% without causing more errors and that it is perceived as being fun to use and preferred over the standard browsing interface by 70% of the participants.}, isbn10 = {978-1-4503-1089-5}, language = {EN}, location = {Nara, Japan}, talkdate = {2012.10.31}, talktype = {registered}, url = {http://dl.acm.org/citation.cfm?id=2393347&coll=DL&dl=ACM&CFID=159013035&CFTOKEN=94655035} } @InProceedings{Wieser2011c, author = {Wieser, Stefan and Böszörmenyi, Laszlo}, booktitle = {2011 IEEE International Symposium on Network Computing and Applications (NCA2011)}, title = {Decentralized topology aggregation for {QoS} estimation in large overlay networks}, year = {2011}, address = {Cambridge, USA}, editor = {Rasmus Løvenstein, Olsen and Paolo, Romano and Tatsuhiro, Tsuchiya}, month = {aug}, pages = {298-302}, publisher = {IEEE}, abstract = {This paper introduces a scalable approach for efficient, low-cost multi-level Quality of Service (QoS) estimation in large overlay networks (ON). We modify an existing distributed partitioning algorithm [1], and use it to create ”QoS maps”. QoS maps empower applications to quickly predict several QoS metrics for any given route, and to obtain multiple alternative routes to any target node in the ON. We show that our modifications of the partitioning algorithm permit the aggregation of large hubs, but still preserve the sublinear runtime of the original heuristic. Simulations with large ONs are performed to evaluate the proposed approach and demonstrate its scalability. Finally, we outline our estimation algorithm that we use to predict QoS and perform QoS aware routing in any given ON.}, language = {EN}, location = {Cambridge, USA}, pdf = {https://www.itec.aau.at/bib/files/NCA2011.pdf}, talkdate = {2011.08.25}, talktype = {registered} } @TechReport{Wieser2011b, author = {Wieser, Stefan and Böszörmenyi, Laszlo}, institution = {Institute of Information Technology (ITEC), Klagenfurt University}, title = {Decentralized topology aggregation for QoS estimation in large overlay networks}, year = {2011}, address = {Klagenfurt, Austria}, month = {mar}, number = {TR/ITEC/01/2.11}, language = {EN}, pages = {26}, pdf = {https://www.itec.aau.at/bib/files/Hierarchical_Aggregation_for_QoS Estimation.pdf} } @TechReport{Sobe2011a, author = {Sobe, Anita and Elmenreich, Wilfried and Böszörmenyi, Laszlo}, institution = {Institute of Information Technology ({ITEC}), Klagenfurt University}, title = {Storage Balancing in Self-organizing Multimedia Delivery Systems}, year = {2011}, address = {Klagenfurt, Austria}, month = {oct}, number = {TR/ITEC/01/2.13, arxiv e-print 1111.0242}, language = {EN}, pages = {16}, url = {http://arxiv.org/abs/1111.0242} } @InProceedings{Sobe2011, author = {Sobe, Anita and Elmenreich, Wilfried and Böszörmenyi, Laszlo}, booktitle = {Proceedings of the Ninth Workshop on intelligent solutions for embedded systems}, title = {Replication for Bio-inspired Delivery in Unstructured Peer-to-Peer Networks}, year = {2011}, address = {Los Alamitos, CA, USA}, editor = {Kucera, Markus and Waas, Thomas}, month = {jul}, pages = {6}, publisher = {IEEE}, language = {EN}, location = {Regensburg, Germany}, talkdate = {2011.07.08}, talktype = {registered} } @InProceedings{Lagger2011, author = {Lagger, Christoph and Lux, Mathias and Marques, Oge}, booktitle = {Workshop on Multimedia on the Web 2011, Proceedings of}, title = {Which video do you want to watch now?}, year = {2011}, address = {Los Alamitos, California, USA}, editor = {Böszörmenyi, Laszlo and Marques, Oge and Lux, Mathia and Klamma, Ralf}, month = {jan}, note = {to appear in IEEE}, pages = {45-48}, publisher = {IEE}, abstract = {Searching and retrieving videos in a meaningful way on the web is still an open problem. The integration of a user's context into search is one of the most promising approaches to enhance current search interfaces and algorithms. We performed two user studies investigating video search, video retrieval, and video sharing behavior. In this paper we present an overview on the findings most promising for enhancing user experience in video retrieval. We propose a software prototype that implements an adaptive video retrieval system, that utilizes the users' intentions to provide better search results in a user interface adapted to the intentions and needs of users.}, doi = {10.1109/MMWeb.2011.15}, isbn10 = {978-1-4577-2043-7}, language = {EN}, location = {Graz}, talkdate = {2011.09.08}, talktype = {registered} } @PhdThesis{DelFabro2011a, author = {Del Fabro, Manfred}, school = {Klagenfurt University}, title = {Non-Sequential Decomposition, Composition and Presentation of Multimedia Content}, year = {2011}, month = {dec}, abstract = {This thesis discusses three major issues that arise in the context of non-sequential usage of multimedia content, i.e. a usage, where users only access content that is interesting for them. These issues are (1) semantically meaningful segmentation of videos, (2) composition of new video streams with content from different sources and (3) non-sequential presentation of multimedia content. A semantically meaningful segmentation of videos can be achieved by partitioning a video into scenes. This thesis gives a comprehensive survey of scene segmentation approaches, which were published in the last decade. The presented approaches are categorized based on the underlying mechanisms used for the segmentation. The characteristics that are common for each category as well as the strengths and weaknesses of the presented algorithms are stated. Additionally, an own scene segmentation approach for sports videos with special properties is introduced. Scenes are extracted based on recurring patterns in the motion information of a video stream. Furthermore, different approaches in the context of real-life events are presented for the composition of new video streams based on content from multiple sources. Community-contributed photos and videos are used to generate video summaries of social events. The evaluation shows that by using content provided by a crowd of people a new and richer view of an event can be created. This thesis introduces a new concept for this emerging view, which is called ``The Vision of Crowds''. The presentation of such newly, composed video streams is described with a simple but powerful formalism. It provides a great flexibility in defining the temporal and spatial arrangement of content. Additionally, a video browsing application for the hierarchical, non-sequential exploration of video content is introduced. It is able to interpret the formal description of compositions and can be adapted for different purposes with plug-ins.}, language = {EN}, pages = {168} } @InProceedings{DelFabro2011, author = {Del Fabro, Manfred and Böszörmenyi, Laszlo}, booktitle = {ACM CHI 2011 Workshop – Data Collection By The People For The People}, title = {The Vision of Crowds: Social Event Summarization Based on User- Generated Multimedia Content}, year = {2011}, address = {http://databythepeople.com/ (May 2011)}, editor = {Robson, Christine and Kandel, Sean and Heer, Jeff and Pierce, Jeff}, month = {may}, pages = {1--5}, publisher = {published on workshop homepage}, abstract = {In this position paper we introduce the idea of generating a superior view of a large social event, based on user-generated -- crowdsourced -- content. Instead of just collecting and making them available in a raw form (as social platforms like YouTube), we automatically generate semantically coherent summarizations of the entire event. The individual consuming user gets thus a compact view generated by a large number of producing users. We call this idea the "Vision of Crowds". A case study has been conducted at a social event where we used user-generated content to automatically generate live reports about that event. Furthermore, we have implemented a GUI that allows users to interactively compose personalized video summaries, based on the user-generated data collected at the case study.}, language = {EN}, location = {Vancouver, BC, Canada}, pdf = {https://www.itec.aau.at/bib/files/The Vision of Crowds - Social Event Summarization Based on User-Generated Multimedia Content.pdf}, talkdate = {2011.05.08}, talktype = {registered} } @Article{Boszormenyi2011, author = {Böszörmenyi, Laszlo and del Fabro, Manfred and Kogler, Marian and Lux, Mathias and Marques, Oge and Sobe, Anita}, journal = {Multimedia Tools and Applications}, title = {Innovative directions in self-organized distributed multimedia systems}, year = {2011}, issn = {1380-7501}, month = {jan}, note = {10.1007/s11042-010-0622-z}, pages = {525-553}, volume = {51}, abstract = {The way by which multimedia contents are produced, delivered across networks, and consumed by intended users have shifted significantly during the past 10 years. In this paper we postulate that, in the near future, flexible and self-organizing facilities will play a dominating role in distributed multimedia systems. We discuss how such systems can be designed, using a three-layer (sensor, distribution, and user layer) architecture, SOMA (Self Organizing Multimedia Architecture), as an example. We also present innovative directions in three main aspects of self-organized multimedia systems: (i) the self-organizing aspects of multimedia user communities, e.g., the wisdom, intentions, and needs of users; (ii) a fresh look at video streams that treat them as a collection of units that can be composed taking user and network aspects into account; and (iii) new delivery paradigms and how self-organization and multimedia delivery can be combined.}, address = {Berlin, Heidelberg, New York}, doi = {10.1007/s11042-010-0622-z}, language = {EN}, publisher = {Springer Verlag} } @InProceedings{Wieser2011a, author = {Wieser, Stefan and Böszörmenyi, Laszlo}, booktitle = {The Second International Conferences on Advances in Multimedia (MMEDIA 2010)}, title = {Flocks: Interest-Based Construction of Overlay Networks}, year = {2010}, address = {Washington, USA}, editor = {Benoit, Huet and Alan, Smeaton and Ketan, Mayer-Patel and Yannis, Avrithis}, month = {jun}, pages = {119-124}, publisher = {IEEE}, abstract = {Self-organizing overlay networks have received a lot of attention in the recent years. However, despite the popularity of content-aware and topology-aware overlay networks, surprisingly little research has been done to combine both approaches. In this paper, we create robust and flexible overlay networks that we call “Flocks”, which can be content-aware, topology-aware, or a combination of both. We model affinity with interests and properties and show the resulting overlay networks work in a decentralized, self-organizing way, and stabilize quickly.}, doi = {10.1109/MMEDIA.2010.22}, journal = {2010 Second International Conferences on Advances in Multimedia (MMEDIA)}, language = {EN}, location = {Athens, Greece}, talkdate = {2010.06.14}, talktype = {registered} } @InProceedings{Sobe2010a, author = {Sobe, Anita and Elmenreich, Wilfried and Böszörmenyi, Laszlo}, booktitle = {Proceedings of the 18th International Conference on Multimedea 2010}, title = {{Towards a self-organizing replication model for non-sequential media access}}, year = {2010}, address = {New York}, editor = {Del Bimbo, Alberto and Chang, Shih-Fu and Smeulders, Arnold}, month = {jan}, pages = {3--8}, publisher = {ACM}, isbn10 = {978-1-60558-933-6}, keywords = {non-sequential, replication, self-organization, video delivery}, language = {EN}, location = {Florence, Italy}, talkdate = {2010.10.29}, talktype = {registered} } @Article{Sobe2010, author = {Sobe, Anita and Böszörmenyi, Laszlo and Taschwer, Mario}, journal = {International Journal on Advances in Software}, title = {{Video Notation (ViNo): A Formalism for Describing and Evaluating Non-sequential Multimedia Access}}, year = {2010}, issn = {1942-2628}, month = {sep}, number = {1 \& 2}, pages = {19-30}, volume = {3}, abstract = {The contributions of this paper are threefold: (1) the extensive introduction of a formal Video Notation (ViNo) that allows for describing different multimedia transport techniques for specifying required QoS; (2) the application of this formal notation to analyzing different transport mechanisms without the need of detailed simulations; (3) further application of ViNo to caching techniques, leading to the introduction of two cache admission policies and one replacement policy supporting nonsequential multimedia access. The applicability of ViNo is shown by example and by analysis of an existing CDN simulation. We find that a pure LRU replacement yields significantly lower hit rates than our suggested popularity-based replacement. The evaluation of caches was done by simulation and by usage of ViNo.}, address = {Valencia, Spain}, language = {EN}, pdf = {https://www.itec.aau.at/bib/files/Intl_Journal_Advances_Software_2010_Vol3.pdf}, publisher = {International Academy, Research and Industry Association (IARIA)}, url = {http://www.iariajournals.org} } @InProceedings{MLux_2010, author = {Chatzchristofis, Sawas and Boutalis, Yiannis and Lux, Mathias}, booktitle = {Agents and Artificial Intelligence}, title = {Combining Color and Spatial Color Distribution Information in a Fuzzy Rule Based Compact Composite Descriptor}, year = {2010}, address = {Heidelberg, Germany}, editor = {Filipe, Joaquim and Fred, Ana and Sharp, Bernadette}, month = {jan}, pages = {pp. 49-60}, publisher = {Springer}, abstract = {In this paper, a novel low level feature for content based image retrieval is presented. The proposed feature structure combines color and spatial color distribution information. The combination of these two features in one vector classifies the proposed descriptor to the family of Composite Descriptors. In order to extract the color information, a fuzzy system is being used, which is mapping the number of colors that are included in the image into a custom palette of 8 colors. The way by which the vector of the proposed descriptor is being formed, describes the color spatial information contained in images. To be applicable in the design of large image databases, the proposed descriptor is compact, requiring only 48 bytes per image. Experiments presented in this paper demonstrate the effectiveness of the proposed technique especially for Hand-Drawn Sketches.}, doi = {10.1007/978-3-642-19890-8_4}, edition = {129}, isbn10 = {978-3-642-19889-2}, isbn13 = {978-3-642-19890-8}, language = {EN}, subtitle = {Communications in Computer and Information Science}, talktype = {none} } @InProceedings{DelFabro2010a, author = {Del Fabro, Manfred and Schoeffmann, Klaus and Böszörmenyi, Laszlo}, booktitle = {Proceedings of HCI in Work and Learning, Life and Leisure 6th Symposium of the Workgroup Human-Computer Interaction and Usability Engineering}, title = {Instant Video Browsing: A Tool for Fast Non-sequential Hierarchical Video Browsing}, year = {2010}, address = {Berlin, Heidelberg, New York}, editor = {Leitner, Gerhard and Hitz, Martin and Holzinger, Andreas}, month = {nov}, pages = {443-446}, publisher = {Springer Verlag GmbH}, abstract = {We introduce an easy-to-use video browsing tool which assists users in getting a quick overview of videos as well as in finding segments of interest. It provides a parallel and a tree-based view for browsing the content of videos -- or even video collections -- in a hierarchical, non-sequential manner. The tool has a plug-in architecture and can be extended both by further presentation methods and by video analysis algorithms.}, doi = {10.1007/978-3-642-16607-5_30}, language = {EN}, location = {Klagenfurt, Austria}, pdf = {https://www.itec.aau.at/bib/files/Instant Video Browsing - A Tool for Fast Non-Sequential Hierarchical Video Browsing.pdf}, talkdate = {2010.11.05}, talktype = {registered} } @InProceedings{DelFabro2010, author = {Del Fabro, Manfred and Böszörmenyi, Laszlo}, booktitle = {Proceedings of the Second International Conference on Advances in Multimedia (MMEDIA 2010)}, title = {Video Scene Detection Based on Recurring Motion Patterns}, year = {2010}, address = {Washington (DC)}, editor = {Böszörmenyi, Laszlo and Burdescu, Dumitru and Davies, Philip and Newell, David}, month = {jun}, pages = {113--118}, publisher = {IEEE}, abstract = {We present an algorithm for video scene detection based on the identification of recurring motion sequences within a video stream. The motion information is extracted in the compressed domain of H.264/AVC videos, no full decoding of the video stream is needed. Based on the motion information our algorithm identifies sequences of adjacent frames with similar motion. Throughout all identified motion sequences we are searching for recurring patterns of similar ones. The most recurring pattern is used for the segmentation of the video stream into scenes. The evaluation shows promising results.}, doi = {10.1109/MMEDIA.2010.26}, language = {EN}, location = {Athens, Greece}, pdf = {https://www.itec.aau.at/bib/files/4068a113.pdf}, talkdate = {2010.06.15}, talktype = {registered} } @InProceedings{Sobe2009b, author = {Sobe, Anita and Böszörmenyi, Laszlo}, booktitle = {2009 First International Conference on Advances in Multimedia}, title = {{Non-sequential Multimedia Caching}}, year = {2009}, address = {Los Alamitos, CA, USA}, editor = {Burdescu, Dan and Dini, Petre}, month = jul, pages = {158--161}, publisher = {IEEE}, series = {MMedia'2009}, doi = {10.1109/MMEDIA.2009.36}, language = {EN}, location = {Colmar, France}, talkdate = {2009.07.25}, talktype = {registered} } @InProceedings{Schoeffmann2009e, author = {Schoeffmann, Klaus and Lux, Mathias and Taschwer, Mario and Böszörmenyi, Laszlo}, booktitle = {ICME'09 Proceedings of the 2009 IEEE international Conference on Multimedia and Expo}, title = {Visualization of Video Motion in Context of Video Browsing}, year = {2009}, address = {Los Alamitos, CA, USA}, editor = {Lin, CY and Cox, I}, month = jul, pages = {658-661}, publisher = {IEEE}, abstract = {We present a new approach for video browsing using visualization of motion direction and motion intensity statistics by color and brightness variations. Statistics are collected from motion vectors of H.264/AVC encoded video streams, so full video decoding is not required. By interpreting visualized motion patterns of video segments, users are able to quickly identify scenes similar to a prototype scene or identify potential scenes of interest. We give some examples of motion patterns with different semantic value, including camera zooms, hill jumps of ski-jumpers, and the repeated appearance of a news speaker. In a user study we show that certain scenes of interest can be found significantly faster using our video browsing tool than using a video player with VCR-like controls.}, issn = {9781424442911}, language = {EN}, talktype = {none}, url = {http://dl.acm.org/citation.cfm?id=1698924.1699086} } @InProceedings{Schoeffmann2009d, author = {Schoeffmann, Klaus and Taschwer, Mario and Böszörmenyi, Laszlo}, booktitle = {Proceedings oft the International Conference on Multimedia and Expo 2009}, title = {Video Browsing Using Motion Visualization}, year = {2009}, address = {Los Alamitos, CA, USA}, editor = {Lin, CY and Cox, I}, month = jul, pages = {1835-1836}, publisher = {IEEE}, abstract = {We present a video browsing tool that uses a novel and powerful visualization technique of video motion. The tool provides an interactive navigation index that allows users to quickly and easily recognize content semantics like scenes with fast/slow motion (in general or according to a specific direction), scenes showing still/moving objects in front of a still/moving background, camera pans, or camera zooms. Moreover, the visualization facilitates identification of similar segments in a video. A first user study has shown encouraging results.}, issn = {1945-788X}, language = {EN}, talktype = {none} } @InProceedings{Schoeffmann2009c, author = {Schoeffmann, Klaus and Böszörmenyi, Laszlo}, booktitle = {Content-Based Multimedia Indexing, 2009. CBMI '09}, title = {Video Browsing Using Interactive Navigation Summaries}, year = {2009}, address = {Los Alamitos, CA, USA}, editor = {Avrithis, Yannis and Kollias, Stefanos}, month = jul, pages = {243-248}, publisher = {IEEE}, abstract = {A new approach for interactive video browsing is described. The novelty of the proposed approach is the flexible concept of interactive navigation summaries. Similar to time sliders, commonly used with standard soft video players, navigation summaries allow random access to a video. In addition, they also provide abstract visualizations of the content at a user-defined level of detail and, thus, quickly communicate content characteristics to the user. Navigation summaries can provide visual information about both low-level features but even high-level features. The concept fully integrates the user, who knows best which navigation summary at which level of detail could be most beneficial for his/her current video browsing task, and provide him/her a flexible set of navigation means. A first user study has shown that our approach can significantly outperform standard soft video players - the state-of-the art “poor man’s” video browsing tool.}, doi = {10.1109/CBMI.2009.40}, issn = {9780769536620}, language = {EN}, location = {Chania, Crete}, talkdate = {2009.06.04}, talktype = {registered} } @InProceedings{Schoeffmann2009b, author = {Schoeffmann, Klaus and Böszörmenyi, Laszlo}, booktitle = {Advance in Semantic Media Adaptation and Personalization}, title = {Interactive Video Browsing of H.264 Content Based on Just-in-Time Analysis}, year = {2009}, address = {Boca Raton, FL, USA}, editor = {Angelides, Marios C and Mylonas, Phivos}, month = feb, pages = {159-179}, publisher = {Auerbach Publications}, isbn10 = {1420076647}, isbn13 = {978-1420076646}, language = {EN}, talktype = {none} } @InProceedings{Schoeffmann2009, author = {Schoeffmann, Klaus and Lux, Mathias and Böszörmenyi, Laszlo}, booktitle = {Advances in Multimedia Modeling}, title = {A Novel Approach for Fast and Accurate Commercial Detection in H.264/AVC Bit Streams Based on Logo Identification}, year = {2009}, address = {Berlin, Heidelberg, New York}, editor = {Huet, Benoit and Smeaton, Alan and Mayer-Patel, Ketan and Avrithis, Yannis}, month = jan, pages = {119-127}, publisher = {Springer}, series = {Lecture Notes in Computer Sciences}, abstract = {Commercial blocks provide no extra value for video indexing, retrieval, archiving, or summarization of TV broadcasts. Therefore, automatic detection of commercial blocks is an important topic in the domain of multimedia information systems. We present a commercial detection approach which is based on logo detection performed in the compressed domain. The novelty of our approach is that by taking advantage of advanced features of the H.264/AVC coding, it is both significantly faster and more exact than existing approaches working directly on compressed data. Our approach enables removal of commercials in a fraction of real-time while achieving an average recall of 97.33% with an average precision of 99.31%. Moreover, due to its run-time performance, our approach can also be employed on low performance devices, for instance DVB recorders.}, doi = {10.1007/978-3-540-92892-8_13}, isbn10 = {978-3-540-92891-1}, language = {EN}, talktype = {none}, url = {http://www.springer.com/computer/information+systems/book/978-3-540-92891-1} } @InProceedings{Lux2009b, author = {Lux, Mathias}, booktitle = {Multimedia, 2009. ISM '09. 11th IEEE International Symposium on}, title = {An Evaluation of Metrics for Retrieval of MPEG-7 Semantic Descriptions}, year = {2009}, address = {Los Alamitos, CA, USA}, editor = {Tsai, Jeffrey and Jain, Ramesh}, month = dec, pages = {546-551}, publisher = {IEEE}, abstract = {MPEG-7 is an extensive multimedia metadata standard covering a huge number of aspects of metadata. However, as with most metadata standards details of usage and application of the standards are – at least partially – open to interpretation. In case of MPEG-7storage and transmission of high level metadata on concept level are defined but retrieval methods are not proposed. So if for instance a user annotates photos using the MPEG-7 semantic description scheme, there are no standardized ways to retrieve the photos based on the annotation. In this paper we propose metrics for retrieval based on the MPEG-7 semantic description scheme and evaluate them in a digital photo retrieval scenario.}, doi = {10.1109/ISM.2009.104}, isbn10 = {978-1-4244-5231-6}, language = {EN}, talktype = {none} } @Article{Lux2009a, author = {Lux, Mathias and Marques, Oge and Schoeffmann, Klaus and Böszörmenyi, Laszlo and Lajtai, Georg}, journal = {Multimedia Tools and Applications}, title = {A novel tool for summarization of arthroscopic videos}, year = {2009}, month = sep, pages = {521 - 544}, abstract = {Arthroscopic surgery is a minimally invasive procedure that uses a small camera to generate video streams, which are recorded and subsequently archived. In this paper we present a video summarization tool and demonstrate how it can be successfully used in the domain of arthroscopic videos. The proposed tool generates a keyframe-based summary, which clusters visually similar frames based on user-selected visual features and appropriate dissimilarity metrics. We discuss how this tool can be used for arthroscopic videos, taking advantage of several domain-specific aspects, without losing its ability to work on general-purpose videos. Experimental results confirm the feasibility of the proposed approach and encourage extending it to other application domains.}, address = {Berlin, Heidelberg, New York}, language = {EN}, publisher = {Springer}, url = {http://www.springerlink.com/content/u037362581245316/} } @InProceedings{Lux2009, author = {Lux, Mathias and Schoeffmann, Klaus and Marques, Oge and Böszörmenyi, Laszlo}, booktitle = {9th Workshop on Multimedia Metadata (WMM'09)}, title = {A Novel Tool for Quick Video Summarization using Keyframe Extraction Techniques}, year = {2009}, address = {Aachen, Germany}, editor = {Grigoras, Romulus and Charvillat, Vincent and Klamma, Ralf and Kosch, Harald}, month = mar, pages = {62-76}, publisher = {http://ceur-ws.org}, abstract = {The increasing availability of short, unstructured video clips on the Web has generated an unprecedented need to organize, index, annotate and retrieve video contents to make them useful to potential viewers. This paper presents a novel, simple, and easy-to-use tool to benchmark different low level features for video summarization based on keyframe extraction. Moreover, it shows the usefulness of the benchmarking tool by developing hypothesis for a chosen domain through an exploratory study. It discusses the results of exploratory studies involving users and their judgment of what makes the summary generated by the tool a good one.}, language = {EN}, talktype = {none}, url = {http://sunsite.informatik.rwth-aachen.de/Publications/CEUR-WS/Vol-441/p04.pdf} } @InProceedings{Kogler2009, author = {Kogler, Marian and Del Fabro, Manfred and Lux, Mathias and Schoeffmann, Klaus and Böszörmenyi, Laszlo}, booktitle = {Proceedings of the 10th International Workshop of the Multimedia Metadata Community on Semantic Multimedia Database Technologies (SeMuDaTe'09) in conjunction with the 4th International Conference on Semantic and Digital Media Technologies (SAMT 2009)}, title = {Global vs. Local Feature in Video Summarization: Experimental Results}, year = {2009}, address = {Aachen, Germany}, editor = {Ralf, Klamma and Harald, Kosch and Lux, Mathias and Florian, Stegmaier}, month = dec, pages = {6}, publisher = {http://ceur-ws.org}, language = {EN}, talktype = {none}, url = {http://sunsite.informatik.rwth-aachen.de/Publications/CEUR-WS/Vol-539/} } @InProceedings{Kofler2009c, author = {Kofler, Christoph and Lux, Mathias}, booktitle = {MM '09 Proceedings of the 17th ACM international conference on Multimedia}, title = {Dynamic presentation adaptation based on user intent classification.}, year = {2009}, address = {NA}, editor = {Gao, Wen and Tui, Yong and Hanjalic, Alan}, month = oct, pages = {1117-1118}, publisher = {NA}, abstract = {Results of internet searches are typically presented as lists. When searching for digital photos different search result presentations however offer different benefits. If users are primarily interested in the visual content of images a thumbnail grid may be more appropriate than a list. For people searching photos taken at a specific place image metadata in the result presentation is of interest too. In this paper we present an application which monitors a user's behavior while searching for digital photos and classifies the user's intention. Based on the intention, the result is adapted to support the user in an optimal way.}, doi = {10.1145/1631272.1631526}, language = {EN}, talktype = {none}, url = {http://dl.acm.org/citation.cfm?id=1631526} } @InProceedings{Kofler2009b, author = {Kofler, Christoph and Lux, Mathias}, booktitle = {Proceedings of I-KNOW ’09 and I-SEMANTICS ’09}, title = {An Exploratory Study on the Explicitness of User Intentions in Digital Photo Retrieval.}, year = {2009}, address = {Graz, Austria}, editor = {Tochtermann, Klaus and Maurer, Hermann}, month = sep, pages = {208-214}, publisher = {TU Graz \& Know Center}, abstract = {Search queries are typically interpreted as specification of information need of a user. Typically the search query is either interpreted as is or based on the context of a user, being for instance a user profile, his/her previously undertaken searches or any other background information. The actual intent of the user – the goal s/he wants to achieve with information retrieval – is an important part of a user’s context. In this paper we present the results of an exploratory study on the interplay between the goals of users and their search behavior in multimedia retrieval.}, language = {EN}, talktype = {none}, url = {http://www.i-know.tugraz.at/2009/papers/an_exploratory_study_explicitness_user_intentions.pdf} } @Article{Karpati2009, author = {Karpati, Peter and Szkaliczki, Tibor and Böszörmenyi, Laszlo}, journal = {Multimedia Tools and Applications}, title = {Designing and scaling distributed VoD servers}, year = {2009}, issn = {1380-7501}, month = jan, pages = {55-91}, volume = {Volume 41, Number 1}, abstract = {Planning Video-on-Demand (VoD) services based on the server architecture and the available equipment is always a challenging task. We created a formal model to support the design of distributed video servers that adapt dynamically and automatically to the changing client demands, network and host parameters. The model makes giving estimations about the available throughput possible, and defines evaluation criteria for VoD services relating to utilization and load balance, video usage, client satisfaction and costs. The dynamism of the frame model originates from the possible state transitions which have to be defined in a core model. The core model is responsible for configuration recommendation which determines how clients are served depending on the properties of their requests, system configuration and system load. Furthermore, it decides on the optimal placement of the server components in the network. The usability of the model is illustrated on examples.}, address = {Berlin, Heidelberg, New York}, language = {EN}, publisher = {Springer}, url = {http://www.springerlink.com/content/1153860131r36v13/?p=c2702cc6a0b347749314ae5367dc47f0&pi=0} } @MastersThesis{DelFabro2009, author = {Del Fabro, Manfred}, school = {Klagenfurt University}, title = {Extensible Toolkit for Non-Linear Video Exploration}, year = {2009}, month = {jan}, abstract = {In this thesis I give an overview of current research done in the fields of video abstraction, video browsing and interactive video retrieval. In these research fields, which are summarized under the term video exploration, new concepts and solutions are developed that should help the users to get more control over video content again. Furthermore, I am going to introduce "FVET", the Flexible Video Exploration Toolkit. This is a platform that has been developed in the scope of this thesis, to be able to experiment with different approaches of video exploration. As it can be extend with plug-ins, it is very flexible regarding future developments. For this purpose an own plug-in architecture has been implemented that addresses especially the needs of video exploration applications.}, language = {EN}, pages = {124} } @InProceedings{Chatzichristofis2009a, author = {Chatzichristofis, Savvas A and Boutalis, Yiannis and Lux, Mathias}, booktitle = {SISAP '09 Proceedings of the 2009 Second International Workshop on Similarity Search and Applications}, title = {An Interactive Content Based Image Retrieval System}, year = {2009}, address = {Los Alamitos, CA, USA}, editor = {Skopal, Thomas and Zezula, Pavel}, month = aug, pages = {151-153}, publisher = {IEEE}, abstract = {This paper presents an image retrieval suite called img(Rummager) which brings into effect a number of new as well as state of the art descriptors. The application can execute an image search based on a query image, either from XML-based index files, or directly from a folder containing image files, extracting the comparison features in real time. In addition the img(Rummager) application can execute a hybrid search of images from the application server, combining keyword information and visual similarity. Also img(Rummager) supports easy retrieval evaluation based on the normalized modified retrieval rank (NMRR) and average precision (AP).}, isbn10 = {978-0-7695-3765-8}, language = {EN}, talktype = {none}, url = {http://www.computer.org/portal/web/csdl/doi/10.1109/SISAP.2009.16} } @InProceedings{Chatzichristofis2009, author = {Chatzichristofis, Savvas A and Boutalis, YS and Lux, Mathias}, booktitle = {Signal Processing, Pattern Recognition and Applications (SPPRA 2009)}, title = {Selection of the proper compact composite descriptor for improving content based image retrieval}, year = {2009}, address = {Calgary, Canada}, editor = {Zagar, B}, month = feb, pages = {00-00}, publisher = {ACTA Press}, abstract = {Compact Composite Descriptors (CCD) are global image features capturing both, color and texture characteristics, at the same time in a very compact representation. In this paper we propose a combination of two recently introduced CCDs (CEDD and FCTH) into a Joint Composite Descriptor (JCD). We further present a method for descriptor selection to approach the best ANMRR that would result from CEDD and FCTH. With our approach the most appropriate descriptor in terms of maximization of information content can be found on a per image basis without knowledge of the data set as a whole. Experiments conducted on three known benchmarking image databases demonstrate the effectiveness of the proposed technique.}, language = {EN}, talktype = {none}, url = {http://www.actapress.com/PaperInfo.aspx?PaperID=34669&reason=500} } @InProceedings{Boeszoermenyi2009a, author = {Böszörmenyi, Laszlo}, booktitle = {Informatik macht Zukunft - Zukunft macht Informatik}, title = {Das Ideal der Ausführbarkeit in der Informatik und Gesellschaft}, year = {2009}, address = {Vienna, Austria}, editor = {Chroust, Gerhard and Mössenböck, Hans-Peter}, month = dec, pages = {117-122}, publisher = {OCG}, issn = {9783854032588}, language = {DE}, talktype = {none}, url = {http://www.siabshop.com/ocgbookshop/product_info.php/info/p50_Informatik-macht-Zukunft---Zukunftsmacht-Informatik.html/XTCsid/612c1725ded1d040d0098ae0fe5612a4} } @InProceedings{Boeszoermenyi2009, author = {Böszörmenyi, Laszlo}, booktitle = {Zeit erinnern}, title = {Können sich Computer erinnern?}, year = {2009}, address = {Klagenfurt, Austria}, editor = {Antonitsch, Peter and Scherbantin, Annette and Theuermann, Anneliese and Wakounig, Vladimir}, month = oct, pages = {205-215}, publisher = {Drava Verlag}, series = {Drava Diskurs}, issn = {9783854356004}, language = {DE}, talktype = {none}, url = {http://ifeb.uni-klu.ac.at/index.php?id=120&tx_ttnews[tt_news]=34&tx_ttnews[backPid]=22&cHash=bb0520ffc9} } @InProceedings{Szkaliczki2008, author = {Szkaliczki, Tibor and Karpati, Peter and Böszörmenyi, Laszlo}, booktitle = {Communication Systems and Networks 2008}, title = {Algorithms for Placement of Storage Components and Videos in Distributed Multimedia Servers}, year = {2008}, address = {Calgary, Canada}, editor = {Salvador, CP}, month = jun, pages = {43-48}, publisher = {ACTA Press}, abstract = {We plan to setup a VoD service built on an innovative multimedia server architecture which enables dynamic adaptation to the changing circumstances. The adaptation happens by replicating the server components and the stored videos based on real-time host and network monitoring and resource constraint analysis. In addition, the terminal capabilities and client preferences are considered. The paper focuses on the challenge of the optimal placement of storage components and the videos in the network. We compare three implemented optimisation algorithms (so called simple, incremental and complex incremental); the latter one can be calibrated against different preferences. We examine the effect of changing weights of the algorithm onto the recommendation.}, issn = {9780889867581}, language = {EN}, talktype = {none}, url = {http://www.iasted.org/conferences/pastinfo-629.html} } @InProceedings{Strohmaier2008a, author = {Strohmaier, Markus and Prettenhofer, Peter and Lux, Mathias}, booktitle = {Proceedings of the Workshop on Common Sense Knowledge and Goal-Oriented Interfaces}, title = {Different Degrees of Explicitness in Intentional Artifacts: Studying User Goals in a Large Search Query Log}, year = {2008}, address = {Aachen, Germany}, editor = {Gordon, Andrew and Havasi, Catherine and Lux, Mathias and Strohmaier, Markus}, month = jan, pages = {10}, publisher = {http://ceur-ws.org}, series = {CEUR Workshop Proceedings}, abstract = {On the web, search engines represent a primary instrument through which users exercise their intent. Understanding the specific goals users express in search queries could improve our theoretical knowledge about strategies for search goal formulation and search behavior, and could equip search engine providers with better descriptions of users’ information needs. However, the degree to which goals are explicitly expressed in search queries can be suspected to exhibit considerable variety, which poses a series of challenges for researchers and search engine providers. This paper introduces a novel perspective on analyzing user goals in search query logs by proposing to study different degrees of intentional explicitness. To explore the implications of this perspective, we studied two different degrees of explicitness of user goals in the AOL search query log containing more than 20 million queries. Our results suggest that different degrees of intentional explicitness represent an orthogonal dimension to existing search query categories and that understanding these different degrees is essential for effective search. The overall contribution of this paper is the elaboration of a set of theoretical arguments and empirical evidence that makes a strong case for further studies of different degrees of intentional explicitness in search query logs.}, language = {EN}, talktype = {none}, url = {http://sunsite.informatik.rwth-aachen.de/Publications/CEUR-WS/Vol-323/paper04.pdf} } @InProceedings{Strohmaier2008, author = {Strohmaier, Markus and Prettenhofer, Peter and Lux, Mathias}, booktitle = {Workshop on Common Sense Knowledge and Goal-Oriented Interfaces (CSKGOI 08)}, title = {Different Degrees of Explicitness in Intentional Artifacts}, year = {2008}, address = {Klagenfurt, Austria}, editor = {Gordon, Andrew and Havasi, Catherine and Lux, Mathias and Strohmaier, Markus}, month = jan, pages = {10}, publisher = {Klagenfurt University}, abstract = {On the web, search engines represent a primary instrument through which users exercise their intent. Understanding the specific goals users express in search queries could improve our theoretical knowledge about strategies for search goal formulation and search behavior, and could equip search engine providers with better descriptions of users’ information needs. However, the degree to which goals are explicitly expressed in search queries can be suspected to exhibit considerable variety, which poses a series of challenges for researchers and search engine providers. This paper introduces a novel perspective on analyzing user goals in search query logs by proposing to study different degrees of intentional explicitness. To explore the implications of this perspective, we studied two different degrees of explicitness of user goals in the AOL search query log containing more than 20 million queries. Our results suggest that different degrees of intentional explicitness represent an orthogonal dimension to existing search query categories and that understanding these different degrees is essential for effective search. The overall contribution of this paper is the elaboration of a set of theoretical arguments and empirical evidence that makes a strong case for further studies of different degrees of intentional explicitness in search query logs.}, language = {EN}, talktype = {none} } @InProceedings{Schoeffmann2008a, author = {Schoeffmann, Klaus and Böszörmenyi, Laszlo}, booktitle = {Proceedings of the 18th International Workshop on Network and Operating Systems Support for Digital Audio and Video}, title = {Fast and Flexible Video Content Browsing based on H.264/AVC Features}, year = {2008}, address = {New York, NY, USA}, editor = {Griwodz, Carsten and Wolf, Lars}, month = may, pages = {115-116}, publisher = {ACM Press}, abstract = {We present a video content browsing tool which is supposed to be used for two purposes: (1) efficiently searching a certain scene within a long video sequence and (2) quickly identifying videos out of interest. Instead of a complex user interface with many features we rather use a simple but flexible player-like interface which can, however, support the user on taking advantage of his/her knowledge about the content semantics. The content analysis is based on some simple features which can be extracted from compressed data of H264/AVC and, thus, allow very fast analysis. An early user study has shown encouraging results.}, doi = {10.1145/1496046.1496075}, isbn10 = {978-1-60558-157-6}, language = {EN}, talktype = {none}, url = {http://www.nossdav.org/2008/} } @InProceedings{Schoeffmann2008, author = {Schoeffmann, Klaus and Böszörmenyi, Laszlo}, booktitle = {Advances in Multimedia Modeling}, title = {Fast Segmentation of H.264/AVC Bitstreams for On-Demand Video Summarization}, year = {2008}, address = {Berlin, Heidelberg, New York}, editor = {Satoh, Shin’ichi and Nack, Frank and Etoh, Minoru}, month = jan, pages = {265-276}, publisher = {Springer}, series = {LNCS 4903}, abstract = {Video summarization methods need fast segmentation of a video into smaller units as a first step, especially if used in an on-demand fashion. We propose an efficient segmentation algorithm for H.264/AVC bitstreams that is able to segment a video in appr. 10% of the time required to decode the video. This is possible because our approach uses features available after entropy-decoding (which is the very first stage of the decoding process) only. More precisely, we use a combination of two features, especially appropriate to H.264/AVC, with different characteristics in order to decide if a new segment starts or not: (1) L1-Distance based partition histograms and (2) ratio of intra-coded macroblocks on a per-frame basis. Our results show that this approach performs well and works for several different encoders used in practice today.}, issn = {0302-9743}, language = {EN}, talktype = {none}, url = {http://www.springerlink.com/content/bv13746227j58713/} } @InProceedings{Marques2008, author = {Marques, Oge and Lux, Mathias}, booktitle = {Proceeding of the 2nd ACM workshop on Multimedia semantics}, title = {An exploratory study on joint analysis of visual classification in narrow domains and the discriminative power of tags}, year = {2008}, address = {New York, NY, USA}, editor = {Fotouhi, Farshad and Grosky, William and Stanchev, Peter}, month = nov, pages = {40-47}, publisher = {ACM Press}, language = {EN}, talktype = {none}, url = {http://portal.acm.org/citation.cfm?doid=1460676.1460685} } @InProceedings{Lux2008d, author = {Lux, Mathias and Granitzer, Gisela and Beham, Günter}, booktitle = {Multimedia Semantics. The Role of Metadata}, title = {User-Centered Multimedia Retrieval Evaluation based on Empirical Research}, year = {2008}, address = {Berlin, Heidelberg, New York}, editor = {Lux, Mathias and Spaniol, Marc}, month = dec, pages = {175-194}, publisher = {Springer}, series = {Studies in Computational Intelligence}, issn = {9783540774723}, language = {EN}, talktype = {none}, url = {http://www.springer.com/engineering/book/978-3-540-77472-3} } @InProceedings{Lux2008c, author = {Lux, Mathias and Marques, Oge and Pitman, Arthur}, booktitle = {Proceedings of the I-KNOW´08 and I-MEDIA´08}, title = {Using Visual Features to Improve Tag Suggesions in Image Sharing Sites}, year = {2008}, address = {Graz, Austria}, editor = {Tochtermann, Klaus and Maurer, Hermann}, month = aug, pages = {425-429}, publisher = {TU Graz \& Know Center}, issn = {0948695x}, language = {EN}, talktype = {none}, url = {http://www.jucs.org} } @InProceedings{Lux2008b, author = {Lux, Mathias}, booktitle = {2008 Ninth International Workshop on Image Analysis for Multimedia Interactive Services}, title = {Revisiting the Vector Retrieval Model in Context of the MPEG-7 Semantic Description Scheme}, year = {2008}, address = {Los Alamitos, CA, USA}, editor = {Hellwagner, Hermann and Timmerer, Christian}, month = apr, pages = {134-138}, publisher = {IEEE}, isbn10 = {978-0-7695-3130-4}, language = {EN}, talktype = {none}, url = {http://www2.computer.org/portal/web/csdl/abs/proceedings/wiamis/2008/3130/00/3130toc.htm} } @InProceedings{Lux2008a, author = {Lux, Mathias and Russ, Christian}, booktitle = {Information Systems and e-Business Technologies, 2nd International United Information Systems Conference}, title = {A Model of Self-Organized Criticality in Emergent Web Systems}, year = {2008}, address = {Berlin, Heidelberg, New York}, editor = {Kaschek, Roland and Kop, Christian and Steinberger, Claudia and Fliedl, Günther}, month = apr, pages = {496-507}, publisher = {Springer}, series = {Lecture Notes in Business Information Processing}, abstract = {Self-organized criticality (SOC) is a measure to identify if complex systems have the potential to build out emergent behavior. This phenomenon is known in many different areas of physics, biology, ecology, economy and social systems. Its core assertion is that an over critical energy input can lead to spontaneous, self-enforcing and unpredictable self-organization. In such a process new structures and orders emerge. “Online Crowds” are masses of internet users who behave and act collectively on the web. They tend to follow specific online trends and can generate tremendous online traffic and attention (cp. Social software like YouTube.com, MySpace.com, Friendster.com, etc.). “Online Crowds” are observed rarely, are hard to predict and even harder to generate artificially. So it is essential for online business ideas to foster and facilitate these “Online Crowds” to reach a critical mass of online users to grow continuously and to produce profit. The paper in hand introduces the “Online Crowds” model (OCM) in context of web information systems employing the concepts of self organization theory and self organization criticality. Furthermore a statistical approach for detection of indicators of self organized criticality is presented along with experiments and preliminary results showing the applicability of the approach.}, issn = {9783540789413}, language = {EN}, talktype = {none}, url = {http://www.springerlink.com/content/m6133627426456v6/} } @InProceedings{Karpati2008a, author = {Karpati, Peter and Szkaliczki, Tibor and Böszörmenyi, Laszlo}, booktitle = {13th International Telecommunications Network Strategy and Planning Symposium}, title = {Modeling and Simulation of the Performance of Distributed Video Services}, year = {2008}, address = {Los Alamitos, CA, USA}, editor = {Sallai, G}, month = sep, pages = {10}, publisher = {IEEE}, issn = {9789638111685}, language = {EN}, talktype = {none}, url = {http://www.networks2008.org} } @InProceedings{Karpati2008, author = {Karpati, Peter and Szkaliczki, Tibor and Böszörmenyi, Laszlo}, booktitle = {Internet and Multimedia Systems and Applications 2008}, title = {Comparing Static and Self-Organizing Behaviours for VoD Servers}, year = {2008}, address = {Calgary, Canada}, editor = {Mandal, M}, month = mar, pages = {44-49}, publisher = {ACTA Press}, issn = {9780889867512}, language = {EN}, talktype = {none}, url = {http://www.actapress.com/Abstract.aspx?paperId=33806} } @Article{Boeszoermenyi2008c, author = {Böszörmenyi, Laszlo}, journal = {IEEE Annals of the History of Computing}, title = {History of Informatics}, year = {2008}, issn = {10586180}, month = sep, pages = {4-7}, address = {Los Alamitos, CA, USA}, language = {EN}, publisher = {IEEE}, url = {http://www.computer.org/portal/site/annals/index.jsp} } @InProceedings{Boeszoermenyi2008b, author = {Böszörmenyi, Laszlo}, booktitle = {Styles of Thinking in Science and Technology}, title = {Styles of thinking in informatics and how dogmatic is our science?}, year = {2008}, address = {Vienna, Austria}, editor = {Hunger, Hermann and Seebacher, Felicitas and Holzer, Gerhard}, month = sep, pages = {412-416}, publisher = {Verlag der Österreichischen Akademie der Wissenschaften}, issn = {9783700168461}, language = {EN}, talktype = {none} } @InProceedings{Boeszoermenyi2008, author = {Böszörmenyi, Laszlo}, booktitle = {Information Systems and e-Business Technologies}, title = {Public Adoption of Digital Multimedia- Why Is It Lagging behind Expectations?}, year = {2008}, address = {Berlin, Heidelberg, New York}, editor = {Kaschek, Rudolf and Kop, Christian and Steinberger, Claudia and Fliedl, Gerhard}, month = apr, pages = {52-58}, publisher = {Springer}, series = {LNBIP}, abstract = {The talk will address a number of problematic issues in current multimedia technology and try to give some positive answers. The term multimedia is used for a mixture of modalities, at least one of them being continuous. In the center of interest are “natural” videos, taken by cameras.}, issn = {18651348}, language = {EN}, location = {Klagenfurt, Austria}, talkdate = {2008.04.24}, talktype = {registered}, url = {http://www.uniscon.org} } @InCollection{Bailer2008, author = {Bailer, Werner and Brunie, Lionel and Döller, Mario and Granitzer, Michael and Klamma, Ralf and Kosch, Harald and Lux, Mathias and Spaniol, Marc}, booktitle = {Encyclopedia of Multimedia}, publisher = {Springer}, title = {Multimedia Metadata Standards}, year = {2008}, address = {Berlin, Heidelberg, New York}, edition = {2}, editor = {Furht, Borko}, month = sep, pages = {568-575}, issn = {9780387747248}, language = {EN}, url = {http://www.springer.com/computer/information+systems+and+applications/book/978-0-387-74724-8} } @InProceedings{Strohmaier2007, author = {Strohmaier, Markus and Lux, Mathias and Granitzer, Michael and Scheir, P and Liaskos, S and Yu, E}, booktitle = {WISE'07 Proceedings of the 2007 international conference on Web information systems engineering}, title = {How Do Users Express Goals on the Web? - An Exploration of Intentional Structures in Web Search}, year = {2007}, address = {Berlin, Heidelberg, New York}, editor = {Weske, M and Hacid, MS and Godart, C}, month = nov, pages = {67-78}, publisher = {Springer}, series = {LNCS 4832}, abstract = {Many activities on the web are driven by high-level goals of users, such as “plan a trip” or “buy some product”. In this paper, we are interested in exploring the role and structure of users’ goals in web search. We want to gain insights into how users express goals, and how their goals can be represented in a semi-formal way. This paper presents results from an exploratory study that focused on analyzing selected search sessions from a search engine log. In a detailed example, we demonstrate how goal-oriented search can be represented and understood as a traversal of goal graphs. Finally, we provide some ideas on how to construct large-scale goal graphs in a semi-algorithmic, collaborative way. We conclude with a description of a series of challenges that we consider to be important for future research.}, issn = {0302-974}, language = {EN}, talktype = {none}, url = {http://www.springerlink.com/content/w4067u12nu7375r4/?p=61bfd2d5edf24a6bbccfd9434ff4224f&pi=7} } @InProceedings{Spielvogel2007b, author = {Spielvogel, Christian and Böszörmenyi, Laszlo}, booktitle = {Second Interantional Workshop on Semantic Media Adaptation and Personalization}, title = {Quality-of-Service Based Video Replication}, year = {2007}, address = {Los Alamitos, CA, USA}, editor = {Mylonas, P and Wallace, M and Angelides, M}, month = dec, pages = {21-26}, publisher = {IEEE}, abstract = {An approach for quality-of-service based replica management in a proxy-to-proxy network is presented. Management decisions are based on a metrics called replication affinity. Replication affinity combines two other affinity metrics we call (1) placement affinity and (2) reallocation affinity. Placement affinity is used to find the best location to enable QoS based media delivery to future clients. Reallocation affinity is used to make media stream replacement decisions in case of insufficient storage space. Using our approach content replacements can be varied in the granularity. Granularity variations are possible for compressed videos by using multiple description coding (MDC). The effect of using replication affinity is evaluated by emulation experiments. For the experiments the network simulator NS-2 has been used.}, doi = {10.1109/SMAP.2007.17}, issn = {0-7695-3040-0}, language = {EN}, location = {Luxemburg}, talkdate = {2007.12.18}, talktype = {registered}, url = {http://ieeexplore.ieee.org/xpl/tocresult.jsp?sortType%3Dasc_p_Sequence%26filter%3DAND%28p_IS_Number%3A4414370%29&refinements=4293320131&pageNumber=1&resultAction=REFINE} } @TechReport{Spielvogel2007a, author = {Spielvogel, Christian and Böszörmenyi, Laszlo}, institution = {Institute of Information Technology ({ITEC}), Klagenfurt University}, title = {Proxy Affinity}, year = {2007}, address = {Klagenfurt, Austria}, month = jul, number = {TR/ITEC/07/2.06}, language = {EN}, pages = {13}, url = {http://www.isys.uni-klu.ac.at/PDF/ChSp_LB_proxyAffinity.pdf} } @InProceedings{Spielvogel2007, author = {Spielvogel, Christian and Böszörmenyi, Laszlo}, booktitle = {Parallel and Distributed Computing and Networks (PDCN 2007)}, title = {Active and Passive Replication of Multimedia Content in a ProXy-to-ProXy Network (X2X)}, year = {2007}, address = {Calgary, Canada}, editor = {Burkhart, H}, month = feb, pages = {303-308}, publisher = {ACTA Press}, abstract = {Active and passive replication are powerful techniques to improve the quality of multimedia streaming. Most systems follow either the active or the passive approach. A well known example for active replication are Content Distribution Networks [8] that replicate data to predefined static locations. In contrast to that, P2P file sharing networks [2, 1] use passive replication where identical content is usually provided by different peers. We suggest a system that combines both techniques using Proxy Affinity, Request Affinity and Replication Affinity considering user preferences, user behaviour, hardware resources and networks capabilities.}, issn = {978-0-88986-6}, language = {EN}, talktype = {none} } @InProceedings{Spaniol2007, author = {Spaniol, Marc and Klamma, Ralf and Lux, Mathias}, booktitle = {Proceedings of I-Media ´07 and I-Semantics ´07}, title = {Imagesemantics: User-Generated Metadata, Content Based Retrieval \& Beyond}, year = {2007}, address = {Graz, Austria}, editor = {Tochtermann, Klaus and Haas, Werner and Kappe, F and Scharl, A}, month = sep, pages = {41-48}, publisher = {TU Graz \& Know Center}, abstract = {With the advent of Web 2.0 technologies a new attitude towards processing contents in the Internet has emerged. Nowadays it is a lot easier to create, share and retrieve multimedia contents on the Web. However, with the increasing amount in contents retrieval becomes more challenging and often leads to inadequate search results. One main reason is that image clustering and retrieval approaches usually stick either solely to the images' low-level features or their user-generated tags (high-level features). However, this is frequently inappropriate since the "real" semantics of an image can only be derived from the combination of low-level and high-level features. Consequently, we investigated a more holistic view on image semantics based on a system called Imagesemantics. This system combines MPEG-7 descriptions for low-level content-based retrieval features and MPEG-7 keywords by a machine learning approach producing joined OWL rules. The rule base is used in Imagesemantics to improve retrieval results.}, doi = {10.3217/jucs-014-10-1792}, edition = {Volume 14, Issue 10}, issn = {0948-695x}, keywords = {MPEG-7, Web 2.0, social media platform, user-generated content}, language = {EN}, talktype = {none}, url = {http://www.jucs.org/jucs_14_10} } @InProceedings{Schoeffmann2007a, author = {Schoeffmann, Klaus and Fauster, Markus and Lampl, Oliver and Böszörmenyi, Laszlo}, booktitle = {Euro-Par 2007 Parallel Processing}, title = {An Evaluation of Parallelization Concepts for Baseline-Profile Compliant H.264/AVC Decoders}, year = {2007}, address = {Berlin, Heidelberg, New York}, editor = {Kermarrec, Anne-Marie and Bougé, Luc and Priol, Thierry}, month = aug, pages = {782-791}, publisher = {Springer}, series = {LNCS 4641}, abstract = {Due to the increasing performance requirements of decoding H.264/AVC in HDTV or larger resolutions, new approaches are necessary to enable real-time processing. According to the current trend to parallel computation in all performance classes, decoding of AVC must be mapped to these architectures even though this is complicated by the increased complexity and many data dependencies in the codec. We propose and evaluate different ways of using multithreading to speed-up our .NET implemented decoder. While slice based approaches scale best, this is not a flexible approach because of the reliance on specially encoded streams. Functional partitioning and macroblock pipelining prove to be a good alternative for almost all evaluated videos.}, issn = {0302-9743}, language = {EN}, location = {Rennes, France}, talkdate = {2007.08.30}, talktype = {registered}, url = {http://www.springerlink.com/content/q14w6788rp777r63/} } @TechReport{Schoeffmann2007, author = {Schoeffmann, Klaus and Böszörmenyi, Laszlo}, institution = {Institute of Information Technology ({ITEC}), Klagenfurt University}, title = {Early Stage Shot Detection for H.264/AVC Bitstreams}, year = {2007}, address = {Klagenfurt, Austria}, month = jul, number = {TR/ITEC/07/2.04}, language = {EN}, pages = {26}, url = {https://www.itec.aau.at/~klschoef/papers/shotdetection.pdf} } @Article{Rollett2007, author = {Rollett, Herwig and Lux, Mathias and Strohmaier, Markus and Dösinger, Gisela and Tochtermann, Klaus}, journal = {International Journal of Learning Technology (IJLT)}, title = {The Web 2.0 way of learning with technologies}, year = {2007}, issn = {1477-8386}, month = jan, pages = {87–107}, volume = {Vol. 3, No. 1}, abstract = {While there is a lot of hype around various concepts associated with the term Web 2.0 in industry, little academic research has so far been conducted on the implications of this new approach for the domain of education. Much of what goes by the name of Web 2.0 can, in fact, be regarded as new kinds of learning technologies, and can be utilised as such. This paper explains the background of Web 2.0, investigates the implications for knowledge transfer in general, and then discusses its particular use in eLearning contexts with the help of short scenarios. The main challenge in the future will be to maintain essential Web 2.0 attributes, such as trust, openness, voluntariness and self-organisation, when applying Web 2.0 tools in institutional contexts.}, address = {Geneva, Switzerland}, language = {EN}, publisher = {Inderscience Publishers}, url = {http://www.inderscience.com/browse/index.php?journalID=87} } @InProceedings{Oberbichler2007b, author = {Oberbichler, Alexander and Böszörmenyi, Laszlo}, booktitle = {Proceedings of I-Know ´07 - 7th International Conference on Knowledge Management}, title = {Printf in 4D User Interfaces}, year = {2007}, address = {Graz, Austria}, editor = {Tochtermann, Klaus and Maurer, Hermann}, month = sep, pages = {377-383}, publisher = {TU Graz \& Know Center}, language = {EN}, talktype = {none} } @TechReport{Oberbichler2007a, author = {Oberbichler, Alexander and Böszörmenyi, Laszlo}, institution = {Institute of Information Technology ({ITEC}), Klagenfurt University}, title = {Framework for 4d user interfaces}, year = {2007}, address = {Klagenfurt, Austria}, month = apr, number = {TR/ITEC/07/2.01}, abstract = {Time- or history-management systems are implemented in a lot of existing applications. The visited web pages in browsers, the undoing list in nearly every editor or the recorded differences in version control systems are only some examples where time-based information plays an important role. Every kind of information (no matter if we talk about the last headlines in the newspaper or the last user inputs on the workstation) without an explicit date description is nearly useless. Due this fact we are wondering why no global time axis for recording general time-based information is integrated in today’s operating systems. We will introduce a time model to record all kinds of user actions and general time-based events as well. As a second part we will analyze how the visual output system can profit from such a global time axis as well. Up to now it takes a great effort to implement animated user interfaces and so they are rarely found on today’s software market. With the global conjunction of time it is possible to generate animations automatically for every kind of information. We explore the ways of using the time dimension for information presentation (for timely and not timely information as well). We will evaluate these so-called 4D user interfaces1 and introduce a programming model to take advantage of the time-dimension in multiple ways.}, language = {EN}, pages = {18} } @TechReport{Oberbichler2007, author = {Oberbichler, Alexander and Böszörmenyi, Laszlo}, institution = {Institute of Information Technology ({ITEC}), Klagenfurt University}, title = {Animated visualization in 4D UI}, year = {2007}, address = {Klagenfurt, Austria}, month = apr, number = {TR/ITEC/07/2.02.}, abstract = {The visualization of temporal information should not be seen as a special case. A lot of applications take already advantage of the time factor (e.g. capturing user events) but nearly all of them implement this feature completely proprietary. So why do we not embed the time as a ”first class citizen” in today’s operating systems that every application can use time based operations in an unified way. Such an invention would not only improve and standardize the capturing of temporal events but it would be of benefit for a temporal visualization system too. Within a 3D visualization space and a global time axis we introduce a printf4D() 1 method. With this method it is possible to display images, videos, text strings or any other kinds of information in an automatically animated way. As a first proposal we demonstrate this function in a ”flow of information” metaphor where information-objects are not displayed all at once but in a flowing manner over a certain period of time. Additionally we will show that printf4D() is not limited to temporal data. It can be extended automatically to any kind of static information.}, language = {EN}, pages = {12} } @Article{Lux2007c, author = {Lux, Mathias and Dösinger, Gisela}, journal = {International Journal of Knowledge and Learning}, title = {From folksonomies to ontologies: employing wisdom of the crowds to serve learning purposes}, year = {2007}, month = oct, number = {No. 4/5}, pages = {515-528}, volume = {Vol 3}, abstract = {Is Web 2.0 just hype or just a buzzword, which might disappear in the near future One way to find answers to these questions is to investigate the actual benefit of the Web 2.0 for real use cases. Within this contribution we study a very special aspect of the Web 2.0 the folksonomy and its use within self-directed learning. Guided by conceptual principles of emergent computing we point out methods, which might be able to let semantics emerge from folksonomies and discuss the effect of the results in self-directed learning.}, address = {NA}, doi = {10.1504/IJKL.2007.016709}, language = {EN}, publisher = {Inderscience Publishers}, url = {http://www.ingentaconnect.com/content/ind/ijkl/2008/00000003/F0020004/art00009} } @InProceedings{Lux2007b, author = {Lux, Mathias and Granitzer, Michael and Kern, Roman}, booktitle = {18th International Workshop on Database and Expert Systems Applications (DEXA 2007)}, title = {Aspects of Broad Folksonomies}, year = {2007}, address = {Los Alamitos, CA, USA}, editor = {Tjoa, A-Min and Wagner, R R}, month = sep, pages = {283-287}, publisher = {IEEE}, abstract = {Folksonomies, collaboratively created sets of metadata, are becoming more and more important for organising information and knowledge of communites in the Web. While for a single user the difference to keyword assignment is marginal, the power of folksonomies emerges from the collaborative aspects. Folksonomies are already issue of research.Within this publication we analyse underlying statistical properties of broad folksonomies aiming to identify laws and characteristics, which allow inferring properties for folksonomy based retrieval. The actual benefit of folksonomies for retrieval and the derived methods are concluded from experiments with aggregated data from del.icio.us1.}, doi = {10.1109/DEXA.2007.40}, isbn10 = {0-7695-2932-1}, issn = {1529-4188}, language = {EN}, talktype = {none} } @Article{Lux2007a, author = {Lux, Mathias}, journal = {ÖGAI Journal}, title = {Web 2.0: Die soziale Komponente im World Wide Web}, year = {2007}, issn = {0254-4326}, month = mar, pages = {14-18}, address = {Wien}, language = {DE}, publisher = {Österreichische Gesellschaft für Artificial Intelligence} } @InProceedings{Lux2007, author = {Lux, Mathias and Dösinger, Gisela and Beham, Günter}, booktitle = {Datenbanksysteme in Business, Technologie und Web (BTW 2007)}, title = {Empirical Studies in Multimedia Retrieval Evaluation}, year = {2007}, address = {NA}, editor = {Jarke, Matthias and Seidl, Thomas and Quix, Christoph and Kensche,David and Conrad, Stefan and Rahm, Erhard and Klamma, Ralf and Kosch, Harald and Granitzer, Michael and Apel, Sven and Rosenm, Marko and Saake, Gunter and Spinczyk, Olaf}, month = mar, pages = {199-217}, publisher = {NA}, abstract = {The evaluation of retrieval mechanisms for inter-method comparison is necessary in academic as well as in applied research. A major issue in every evaluation is in which way and to what extent the actual perception of the user from the target user group is integrated. Within multimedia retrieval systems the impressions and perceptions of users vary much more than in text retrieval. Empirical studies are a common tool in social science and offer a way to research the correlation between the user perception and the computed similarity between pairs of multimedia documents or a query and the set of results. This approach can be used to complement and extend current evaluation approaches. Within this contribution we summarize general methods from social science and psychology for the interested reader in the area of computer science with some knowledge about statistics. Furthermore we give two examples of undertaken empirical experiments and their outcomes. Within the first one the perception of users is investigated and compared to factors like background and gender, while in the second study metrics are tested upon their ability to reflect the notion of similarity of users. Both experiments aim to give examples and insight on how empirical studies can be used in multimedia research in general and multimedia retrieval evaluation in special.}, issn = {3-86130-929-7}, language = {EN}, talktype = {none}, url = {http://pdf.aminer.org/000/069/740/empirical_studies_in_multimedia_retrieval_evaluation.pdf} } @InProceedings{Lang2007, author = {Lang, Margit and Kosch, Harald and Stars, S and Kettner, Cartsten and Lachner, Janine and Oborny, Doris}, booktitle = {Proceedings of the 8th International Workshop on Image Analysis for Multimedia Interactive Services (WIAMIS 2007)}, title = {Recognition of Botanical Bloom Characteristics from Visual Features.}, year = {2007}, address = {Los Alamitos, CA, USA}, editor = {Kompatsiaris, Y and Avrithis, Y}, month = jun, pages = {27-27}, publisher = {IEEE}, abstract = {There is a number of image retrieval systems which allow a fast similarity search in large image databases. But to our knowledge there are no image retrieval systems which bring together information extraction from the image as well as object recognition and classification of the object analyzed. This paper introduces techniques to enable the extraction of botanical characteristics from visual features to support semi-automatic plant recognition. The identification of plants requires recognition and determination of plant species specific features such as bloom colour, inflorescences, shape of blooms, number of petals and shape of leaves. Our approach is to improve an existing medicinal plant database, called MedPhyt, by this basic requirement. We demonstrate the first steps towards a semiautomatic system for the identification of a plant species or at least plant families by the combination of both bloom colour and contour information under consideration of a specific content and knowledge domain using the features of MPEG-7.}, issn = {076952818X}, language = {EN}, talktype = {none} } @InProceedings{Cobarzan2007, author = {Cobarzan, Claudiu and Böszörmenyi, Laszlo}, booktitle = {Proceedings of the 15th Euromicro Conference on Parallel, Distributed and Network-based Processing}, title = {Further Developments of a Dynamic Distributed Video Proxy-Cache System}, year = {2007}, address = {Los Alamitos, CA, USA}, editor = {Ambra, P D and Guarracino, M R}, month = jan, pages = {349-357}, publisher = {IEEE}, issn = {1066-6192}, language = {EN}, talktype = {none} } @InProceedings{Boeszoermenyi2007b, author = {Böszörmenyi, Laszlo}, booktitle = {Information und Gesellschaft - Technologien einer sozialen Beziehung}, title = {Die Henne, modernes Bewusstsein, das Ei moderne Technik?}, year = {2007}, address = {Wiesbaden, Germany}, editor = {Greif, Hajo and Mitrea, Oana and Werner, Matthias}, month = sep, pages = {41-46}, publisher = {Deutscher Universitäts-Verlag und der VS Verlag für Sozialwissenchaften}, issn = {9783835070073}, language = {DE}, talktype = {none}, url = {https://www.itec.aau.at/~laszlo/publications/Proceedings/LB_2008_Beitrag_Information_und_Gesellschaft_Kurzfassung.pdf} } @InProceedings{Zufferey2006, author = {Zufferey, Michael and Kosch, Harald}, booktitle = {Proceedings of the 48th International Symposium ELMAR-2006}, title = {Semantic Adaptation of Multimedia Content}, year = {2006}, address = {Zadar}, editor = {Grgic, M and Grgic, S}, month = jun, pages = {319-322}, publisher = {IEEE}, abstract = {The increasing diversity of devices and the heterogeneity of networks pose nowadays a challenge in the delivery and consumption of multimedia content. In this context, the Part 7 of the MPEG-21 standard formally named Digital Item Adaptation (DIA) targets the adaptation of multimedia content based on usage environment, such as network characteristics, terminal capabilities and user characteristics. But, MPEG-21 DIA does not take into account MPEG-7 semantics description tools, which provide means for a conceptual (semantic) description that is close to the human understanding of multimedia content. Therefore, to fill this gap, we proposed and implemented an interactive and user-centric framework called Semantic Adaptation Framework (SAF). The SAF provides facilities for the generation of all the required semantic metadata and enables an MPEG-21 adaptation engine to semantically adapt the multimedia content in order to provide the user with the best possible experience.}, issn = {13342630}, language = {EN}, talktype = {none} } @Article{Tochtermann2006, author = {Tochtermann, Klaus and Lux, Mathias}, journal = {WISU - Das Wirtschaftsstudium}, title = {Suchen mithilfe semantischer Metadaten}, year = {2006}, issn = {0340-3084}, month = dec, pages = {1557 - 1563}, volume = {12/06}, abstract = {Daten zu Daten werden Metadaten genannt. Sie ermöglichen die effektive Organisation, Administration und Suche nach Daten aller Arten. Demgegenüber erlaufebn Ontologen die Formalisierung der Fakten und die detailgenaue Beschreibung von Domänenwissen. In vielen Anwendungsbereichen haben sich die klassischen Metadatenformate als zu einfach und Ontologien als zu komplex erwiesen, was zu neuen Formaten führte. Hier wird ein gemeinsames Modell für solche Formate vorgestellt, das sich zur Datensuche eignet.}, address = {NA}, language = {DE}, publisher = {NA}, url = {http://www.wisu.de} } @InProceedings{Spielvogel2006, author = {Spielvogel, Christian and Böszörmenyi, Laszlo and Schoeffmann, Klaus}, booktitle = {Minema Workshop Proceedings}, title = {An adaptive and self-organizing Proxy-to-Proxy Middleware}, year = {2006}, address = {Leuven}, editor = {Universität, Leuven}, month = feb, pages = {6}, publisher = {Eigenverlag Universität Leuven}, language = {EN}, talktype = {none} } @InProceedings{Lux2006c, author = {Lux, Mathias and Scheir, P and Granitzer, Michael and Lindstaedt, S}, booktitle = {6th International Conference on Knowledge Management}, title = {Special Track on Advanced Semantic Technologies - Introduction}, year = {2006}, address = {Graz}, editor = {Tochtermann, Klaus and Maurer, Hermann}, month = sep, pages = {249-251}, publisher = {Eigenverlag in Kooperation mit Springer Verlag}, issn = {0948695x}, language = {EN}, talktype = {none} } @Article{Lux2006b, author = {Lux, Mathias and Klieber, Werner and Granitzer, Michael}, journal = {Journal of Universal Knowledge Management}, title = {On the Complexity of Annotation with the High Level Metadata}, year = {2006}, month = aug, number = {1}, pages = {54-58}, volume = {Vol1}, abstract = {High level metadata provides a way to manage, organize and retrieve multimedia data based on the actual content using content descriptions. The MPEG-7 Semantic Description Scheme provides tools for storing expressive and interpretable high level metadata. As it is currently impossible for computers to create high level metadata autonomously, users have to create the annotations manually. Generally the manual annotation of multimedia content is understood as laborious and complex task. Within this publication we assess the complexity of the annotation task for the MPEG-7 Semantic Description Scheme within a small user evaluation and the results of the evaluation are discussed.}, address = {Graz, Austria}, language = {EN}, publisher = {TU Graz \& Know Center}, url = {http://www.google.at/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=0CBwQFjAA&url=http%3A%2F%2Fciteseerx.ist.psu.edu%2Fviewdoc%2Fdownload%3Fdoi%3D10.1.1.108.3864%26rep%3Drep1%26type%3Dpdf&ei=gYlZUJG-GsrftAbKxYHgAQ&usg=AFQjCNGyOPvZO8TUItZ8PcqiLxXprYgQwA&sig2=IBS-1ay5hqskcgp8L2PlHg&cad=rja} } @InProceedings{Lux2006a, author = {Lux, Mathias and Meyer zu Eissen, Sven and Granitzer, Michael}, booktitle = {Proceedings of the Workshop on Text-Based Information Retrieval TIR 06}, title = {Graph Retrieval with the Suffix Tree Model}, year = {2006}, address = {Riva del Garda}, editor = {Stein, Benno and Kao, Odej}, month = aug, pages = {30-34}, publisher = {Università di Trento, Italy}, abstract = {The paper in hand presents an adoption of the suffix tree model for the retrieval of labeled graphs. The suffix tree model encodes path information of graphs in an efficient way and so reduces the size of the data structures compared to path index based approaches, while offering a better runtime performance than subgraph isomorphism based methods. Within a specific use case we evaluate the correlation of the developed method to human judgement and compare the correlation values to other methods. We show that in our use case, which is the retrieval of digital photos annotated with MPEG-7 using the MPEG-7 Semantic Description Scheme, the presented algorithm performs better than other methods.}, issn = {1613-0073}, language = {EN}, talktype = {none}, url = {http://sunsite.informatik.rwth-aachen.de/Publications/CEUR-WS//Vol-205/} } @Article{Lux2006, author = {Lux, Mathias and Jarke, Matthias and Kosch, Harald}, journal = {Journal of Universal Knowledge Management}, title = {MPEG and Multimedia Metadata Community Workshop Results 2005}, year = {2006}, month = aug, number = {1}, pages = {1-3}, volume = {Vol.1}, abstract = {The year 2005 was a successful year for the MPEG and Multimedia Metadata Community. The community was founded within a first workshop in March 2005 in Klagenfurt, Austria, initiated and organized by Harald Kosch. A second workshop, which took place at the I-Know 05, the International Conference for Knowledge Management 2005 in Graz, Austria, was organized by Mathias Lux and Michael Granitzer to enlarge the community and to plan future joint activities. With a third workshop at the RWTH Aachen, Germany, organized by Marc Spaniol and Ralf Klamma, the community grew further, aims of the community were clarified and the schedule for 2006 was developed. Within the three workshops a lot of topics and projects have been discussed. The JUKM special issue on the MPEG and Multimedia Metadata Community Workshop Results 2005 aims to distribute results of community discussions and projects of the community members. The contributions to this issue have been presented by at least one of the authors at one of the above mentioned workshops. The discussion of the community has been integrated and a scientific paper has been generated. The publication has then been peer reviewed by community members. Two different types of contributions have been accepted. Technical notes are smaller in size, but present valuable partial results of ongoing research. Full papers provide more in depth discussion of applications and approaches as well as results and conclusions. From the various presentations of the three workshops in 2005 six topics have been selected for publication, whereas only the last contribution is not a full paper but a technical note.}, address = {Graz, Austria}, language = {EN}, publisher = {TU Graz \& Know Center}, url = {http://www.jucs.org/jukm_1_1/mpeg_and_multimedia_metadata/jukm_01_01_0001_0003_editorial.pdf} } @InProceedings{Lampl2006, author = {Lampl, Oliver and Stellnberger, Elmar and Böszörmenyi, Laszlo}, booktitle = {Modular Porgramming Languages}, title = {Programming Language Concepts for Multimedia Application Development}, year = {2006}, address = {Heidelberg, Germany}, editor = {Lightfoot, David and Szyperski, Clemens}, month = sep, pages = {23-37}, publisher = {Springer Verlag}, series = {Proceedings of 7th Joint Modular Languages Conference (JMLC)}, issn = {0302-9743}, language = {EN}, talktype = {none} } @Article{KoflerVogt2006, author = {Kofler-Vogt, Andrea and Kosch, Harald and Heuer, Jörg}, journal = {EURASIP Journal on Applied Signal Processing}, title = {BeTrIS - an index system for MPEG-7 streams}, year = {2006}, issn = {1110-8657}, month = jan, pages = {1-11}, abstract = {The ISO/IEC Motion Picture Group (MPEG) issued in 2002 a standard, called MPEG-7, which enables the content description of multimedia data in XML. The standard supports applications to exchange, identify and filter multimedia contents based on MPEG-7 descriptions. However, especially mobile applications that deal with MPEG-7 suffer from limited bandwidth, low computational power and limited battery life. In this document we describe an index system that allows filter mechanisms and random access to encoded MPEG-7 streams and which overcome the limitation of the network and the consuming terminal. Encoding is applied in order to reduce the data rate of the XML documents to be transmitted. The indexed parts of the encoded streams can be accessed without the need to deserialize the complete stream. Furthermore, the system is evaluated and results of the experimental evaluation are discussed.}, address = {NA}, language = {EN}, publisher = {NA}, url = {http://www.hindawi.com/GetArticle.aspx?doi=10.1155/ASP/2006/15482} } @InProceedings{Karpati2006, author = {Karpati, Peter and Szkaliczki, Tibor and Böszörmenyi, Laszlo}, booktitle = {Methods and tools for development of semantic enabled systems and services for multimedia content, interoperability and reusability}, title = {Abstracting Characterizing Distributed VoD Servers}, year = {2006}, address = {Budapest, Ungarn}, editor = {Böszörmenyi, Laszlo and Simonics, Istvan and Pavlov, Radoslav}, month = aug, pages = {16-30}, publisher = {Eigenverlag Universität Klagenfurt/Projekt Hubuska}, language = {EN}, talktype = {none} } @InProceedings{Granitzer2006a, author = {Granitzer, Michael and Neidhart, T and Lux, Mathias}, booktitle = {Proceedings of the 17th International Conference on Database and Expert Systems Applications (DEXA'06)}, title = {Learning Term Spaces based on Visual Feedback}, year = {2006}, address = {Los Alamitos, CA, USA}, editor = {Tjoa, A Min and Wagner, R}, month = sep, pages = {176-180}, publisher = {IEEE Computer Society}, abstract = {Extracting and visualizing concepts and relationship between text documents strongly depends on the used similarity measure. In order to provide meaningful visualizations and to extract useful knowledge from document collections, user needs must be captured by the internal representation of documents, and the used similarity measure. In most applications the Vector Space Model and the Cosine similarity are used therefore and serve as good approximations. Nevertheless, influencing similarities between documents is rather hard, since parameter tuning relies heavily on expert knowledge of the underlying algorithms, and the influence of different weighting schemes and similarity measures is not known before. In this paper we present an approach on how to adapt the vector space representation of documents by giving visual feedback to the system. Our approach starts by clustering a corpus of text documents and visualizing the results using multi dimensional scaling techniques. Afterwards, a 2D landscape visualization is shown which can be manipulated by the user. Based on these manipulations the high dimensional representation of the documents is adapted to fit the users need more precisely. Our experiments show that iterating these steps results in an adapted representation of documents and similarities, generating layouts as intended by the user and furthermore increases clustering accuracy. While this paper only investigates the influence on clustering and visualization, the method itself may also be used for increasing classification and retrieval performance since it adapts to the users need of similarity.}, language = {EN}, talktype = {none} } @InProceedings{Granitzer2006, author = {Granitzer, Michael and Kosch, Harald and Lux, Mathias}, booktitle = {6th International Conference on Knowledge Management}, title = {5th Multimedia Metadata Community Workshop - Introduction}, year = {2006}, address = {Graz}, editor = {Tochtermann, Klaus and Maurer, Hermann}, month = sep, pages = {568-569}, publisher = {Eigenverlag in Kooperation mit Springer Verlag}, issn = {0948695x}, language = {EN}, talktype = {none} } @InProceedings{Zufferey2005, author = {Zufferey, Michael and Kosch, Harald}, booktitle = {n Proceedings of the 6th International Workshop on Image Analysis for Multimedia Interactive Services (WIAMIS 2005)}, title = {Semantic Adaptation of Multimedia Content}, year = {2005}, address = {Montreux}, editor = {Dufaux, F and Ebrahimi, T and Strintzis, M}, month = apr, pages = {4}, publisher = {WIAMIS}, abstract = {The increasing diversity of devices and the heterogeneity of networks pose nowadays a challenge in the delivery and consumption of multimedia content. In this context, the Part 7 of the MPEG-21 standard formally named Digital Item Adaptation (DIA) targets the adaptation of multimedia content based on usage environment, such as network characteristics, terminal capabilities and user characteristics. But, MPEG-21 DIA does not take into account MPEG-7 semantics description tools, which provide means for a conceptual (semantic) description that is close to the human understanding of multimedia content. Therefore, to fill this gap, we propose an interactive and user-centric framework called Semantic Adaptation Framework (SAF). The SAF provides facilities for the generation of all the required semantic metadata and enables an MPEG-21 adaptation engine to semantically adapt the multimedia content in order to provide the user with the best possible experience.}, issn = {283990067X}, language = {EN}, talktype = {none} } @TechReport{Taschwer2005, author = {Taschwer, Mario and Müller, Armin and Böszörmenyi, Laszlo}, institution = {Institute of Information Technology ({ITEC}), Klagenfurt University}, title = {Integrating Semantic Search and Adaptive Streaming of Video Segments: the {DAHL} Project}, year = {2005}, address = {Klagenfurt, Austria}, month = {jan}, number = {TR/ITEC/05/2.04}, type = {final report}, abstract = {The DAHL project aimed at demonstrating some of the research achievements at ITEC by extending anexisting web application with content-based search mechanisms and an adaptive streaming environment for video data. The search is based on MPEG-7 descriptions of video data, and video retrieval uses an MPEG-4 conforming adaptive streaming server and player, which allows to adapt the video stream dynamically to client capabilities, user preferences, and available network bandwidth. This report describes the design, implementation, and integration work done in the DAHL project.}, keywords = {semantic video querying, adaptive video streaming, {MPEG-7} annotation tool}, language = {EN}, pages = {34} } @TechReport{Spielvogel2005a, author = {Spielvogel, Christian and Böszörmenyi, Laszlo and Tusch, Roland}, institution = {Institute of Information Technology ({ITEC}), Klagenfurt University}, title = {A Quality of Service based Infrastructure for Adaptive Video Servers}, year = {2005}, address = {Klagenfurt, Austria}, month = feb, number = {TR/ITEC/04/2.14.}, abstract = {We argue for the need of a tool that is able to provide QoS aware server applications with accurate information about current as well as predicted network characteristics. To address this issue, we present the design and evaluation of DANEF - a system that is able to estimate, process and forecast bottleneck bandwidth, available bandwidth, delay, jitter and loss of a certain path. Active measurements are performed by sending small ICMP packet trains and forecasts are performed by applying fast allgorithms that need only small initialization sets. The accuracy of the measurements is achieved by applying an efficient and innovative filtering mechanism, the correctness of the forecasts is achieved by dynamically selecting the best fitting forecast model and by considering the forecast error of previous samples. Our evaluation has shown that DANEF's measurement results are significantly more precise than those yield by the 5 most widely used tools called Bprobe, Cprobe, Pathload, Pathchar and Network Weather Service.}, language = {EN}, pages = {8} } @InProceedings{Spielvogel2005, author = {Spielvogel, Christian and Böszörmenyi, Laszlo}, booktitle = {Proceedings of IASTED International Conference on Internet and Multimedia Systems and Applications (EuroIMSA 2005)}, title = {Measurement and Prediction of Network Characteristics}, year = {2005}, address = {Grindelwald}, editor = {Hamza, M H}, month = feb, pages = {227-233}, publisher = {ACTA Press}, abstract = {We present the extension of an adaptive distributed multimedia streaming server architecture (ADMS) towards a Quality of Service based network infrastructure. The key component of the extension is the distributed active network estimation and forecasting tool (DANEF). It is able to estimate, process and forecast bottleneck bandwidth, available bandwidth, delay, jitter and loss of a certain path between the streaming server and the requesting client. Using this information, the server node that offers the best QoS for a certain client is selected from a set of possible candidates. Active measurements are performed by sending ICMP [15] packet trains and forecasts are performed by applying fast algorithms that need only small initialization sets. The accuracy of the measurements is achieved by applying an efficient and innovative filtering mechanism, the correctness of the forecasts is achieved by dynamically selecting the best fitting forecast model and by considering the forecast error of previous samples. We have compared DANEF to other already existing measurement tools like BProbe, Cprobe, Pathload, Pathchar and Network Weather Service. As can be found in the evaluation part of this paper DANEF is much better suited for estimating QoS characteristics in the context of multimedia streaming than the other 5 tools it has been compared to.}, issn = {088986484}, language = {EN}, talktype = {none} } @InProceedings{Mueller2005, author = {Müller, Armin and Kropfberger, Michael and Böszörmenyi, Laszlo}, booktitle = {Technology-enhanced Learning with Ubiquitous Applications of Integrated Web, Digital TV and Mobile Technologies}, title = {Annotation and presentation of content-variations in a web-based search environment for video}, year = {2005}, address = {Budapest}, editor = {Simonics, Istvan}, month = jul, pages = {67-74}, publisher = {Eigenverlag}, abstract = {In recent years there has been a big increase in the amount and usage of all different kinds of multimedia data. Ranging from digital video broadcasting over the Internet to sharing digital photos and videos from the last holidays with others, multimedia is around everywhere today. Multimedia metadata help us to manage and search for information in these data. They offer searching for keywords as well as semantic search for textual descriptions of complex activities in audio, video and image. Based upon the research and implementation of the DAHL project, we present an approach for the annotation and presentation of content-variations of videos. First we want to have a look at muvino, a tool for creating MPEG-7 metadata descriptions of videos. After that the presentation of search results, especially the variations of videos or video segments is highlighted}, issn = {963311361X}, language = {EN}, talktype = {none} } @Article{Libsie2005, author = {Libsie, Mulugeta and Kosch, Harald}, journal = {Journal of Digital Information Management}, title = {Content-Aware Segment-Based Video Adaptation}, year = {2005}, issn = {0972-7272}, month = jun, number = {Vol. 2}, pages = {88-94}, volume = {3}, abstract = {Video adaptation is an active research area aiming at delivering heterogeneous content to yet heterogeneous devices under different network conditions. It is an important component of multimedia data management to address the problem of delivering multimedia data in distributed heterogeneous environments. This paper presents a novel method of video adaptation called segment-based adaptation. It aims at applying different reduction methods on different segments based on physical content. The video is first partitioned into homogeneous segments based on physical characteristics. Then optimal reduction methods are selected and applied on each segment with the objective of minimizing quality loss and/or maximizing data size reduction during adaptation. In addition to this new method of variation creation, the commonly used reduction methods are also implemented. To realize variation creation, a unifying framework called the Variation Factory is developed. It is extended to the Multi-Step Variation Factory, which allows intermediary videos to serve as variations and also as sources to further variations. Our proposals are implemented as part of a server component, called the Variation Processing Unit (VaPU) that generates different versions of the source and an MPEG-7 metadata document.}, address = {Chennai, India}, language = {DE}, publisher = {Digital Information Research Foundation}, url = {http://www.dirf.org/jdim/v3i2.asp} } @Article{Kosch2005c, author = {Kosch, Harald and Döller, Mario}, journal = {Datenbank Spektrum}, title = {MPEG: Überblick und Integration in Multimedia-Datenbanken}, year = {2005}, month = nov, pages = {26-35}, volume = {Heft 15/5. Jahrgang}, abstract = {Unser Tutorial gibt einen Überblick über die neuesten MPEG-Standards MPEG-7/21/A/B und streicht ihre Bedeutung für Multimedia-Datenbanken heraus.}, address = {Heidelberg}, language = {DE}, publisher = {Springer} } @InProceedings{Kosch2005b, author = {Kosch, Harald and Döller, Mario}, booktitle = {Multimedia and Expo, 2005. ICME 2005. IEEE International Conference on}, title = {Approximating the selectivity of multimedia range queries}, year = {2005}, address = {Amsterdam}, editor = {Smeulders, A}, month = jul, pages = {382-385}, publisher = {IEEE Computer Society}, abstract = {This paper introduces a new approach of approximating the selectivity of multimedia range queries. Estimating the selectivity of a range query is a pre-requisite to optimize a multimedia database query. We use the DBSCAN clustering technique for finding high density areas in the data set. Then, the selectivity is approximated with the help of a density function in combination with the volume of the query’s hypersphere. Our approach is fast and accurate which was evaluated on an image data set using the MPEG-7 Scalable Color Descriptor. The technique is integrated with the help of the extensible optimizer architecture in the Oracle multimedia database system.}, issn = {0-7803-9331-7}, language = {EN}, talktype = {none} } @Article{Kosch2005a, author = {Kosch, Harald and Böszörmenyi, Laszlo and Döller, Mario and Libsie, Mulugeta and Kofer, Andrea and Schojer, Peter}, journal = {IEEE MultiMedia}, title = {The life-cycle of Multimedia Metadata}, year = {2005}, month = mar, number = {1}, pages = {80-86}, volume = {12}, abstract = {During its lifetime, multimedia content undergoes different stages or cycles fromproduction to consumption. Content is created, processed or modified in a postproduction stage, delivered to users, and finally, consumed. Metadata, or descriptive data about the multimedia content, pass through similar stages but with different time lines.1 Metadata may be produced, modified, and consumed by all actors involved in the content production-consumption chain. At each step of the chain, different kinds of metadata may be produced by highly different methods and of substantially different semantic value.}, address = {Washington}, language = {EN}, publisher = {IEEE} } @InProceedings{Kosch2005, author = {Kosch, Harald and Arrich, Alexander}, booktitle = {Kommunikation in Verteilten Systemen (KiVS) 2005}, title = {Methodik und Software zur Erstellung und Konsum von MPEG-21 Digital Items}, year = {2005}, address = {Kaiserslautern}, editor = {Mueller, P and Gotzhein, R and Schmitt, J B}, month = feb, pages = {256-270}, publisher = {Springer Verlag}, series = {Informatik aktuell}, abstract = {Im MPEG-21 Multimedia Framework Standard spielt das Digital Item als fundamentale Transaktions- und Austauscheinheit eine zentrale Rolle. Dieser Artikel beschreibt eine Methodik und Software zur Erstellung und den Konsum von Digital Items. Das Softwarewerkzeug setzt sich aus zwei Teilen zusammen: Der DI Builder erlaubt es Benutzern MPEG-21 Digital Items zu erstellen, die mit dem DI Consumer konsumiert werden können. Der Konsum eines Digital Items umfasst das Abspielen von Mediendateien und die Betrachtung der Metadaten eines Digital Items. Die Software demonstriert Teile des MPEG-21 Standards, im speziellen Teil 2-Digital Item Declaration, Teil 3-Digital Item Identifcation, Teil 5-Rights Expression Language, Teil 6-Rights Data Dictionary und Teil 7-Digital Item Adaptation.}, issn = {3-540-24473-5}, language = {DE}, talktype = {none} } @InProceedings{KoflerVogt2005, author = {Kofler Vogt, Andrea and Kosch, Harald and Heuer, Jörg}, booktitle = {Proceedings of the 6th International Workshop on Image Analysis for Multimedia Interactive Services (WIAMIS 2005)}, title = {Indexing of MPEG-7 Streams}, year = {2005}, address = {Montreux}, editor = {Dufaux, F and Ebrahimi, T and Strintzis, M}, month = apr, pages = {00}, publisher = {IEEE}, abstract = {The ISO/IEC Motion Picture Group (MPEG) issued in 2002 a standard, called MPEG-7, which enables the content description of multimedia data in XML. The standard supports applications to exchange, identify and filter multimedia contents based on MPEG-7 descriptions. However, processing MPEG-7 documents on mobile terminals is problematic, since the verbose XML is not adequate to limited bandwidth, low computational power and limited battery life. In this document we describe an index system that allows filtering and random access to encoded MPEG-7 streams and which overcomes the limitation of the network and the consuming terminal. Encoding is applied in order to reduce the data rate of the XML documents to be transmitted. The indexed parts of the encoded streams can be accessed without the need to deserialize the complete stream. Furthermore, the system is evaluated and results of the experimental evaluation are discussed.}, language = {EN}, location = {Montreux, Switzerland}, talkdate = {2005.04.14}, talktype = {none} } @InProceedings{Kettner2005, author = {Kettner, Cartsten and Kosch, Harald and Lang, Margit and Lachner, Janine and Oborny, Doris and Teppan, Erich}, booktitle = {Database Theory - ICDT 2005}, title = {Creating a Medicinal Plant Database}, year = {2005}, address = {Edinburgh}, editor = {Eiter, T and Libkin, L}, month = {jan}, pages = {413}, publisher = {Springer Verlag}, series = {LNCS}, abstract = {This paper presents the experiences of creating the information system MEDPHYT which is built to collect data on the complete European pharmaceutical and toxicological plant world whose representatives are determined by medical and therapeutic benefit. Focus of the database content is the plant with description of their botanical characteristics, and history of discovery of therapeutic use, etymology, and synonyms. Apart the botanical characterisation there is information on both medical relevant biochemical compounds and their physicochemical characteristics, and toxicological as well as pharmaceutical facts. These data sets determine the basic system of MEDPHYT.}, issn = {3-540-24288-0}, language = {EN}, talktype = {none} } @TechReport{Karpati2005, author = {Karpati, Peter and Szkaliczki, Tibor and Böszörmenyi, Laszlo}, institution = {Institute of Information Technology ({ITEC}), Klagenfurt University}, title = {Mathematical model for distributed VoD servers}, year = {2005}, address = {Klagenfurt, Austria}, month = {jan}, abstract = {Universal Multimedia Access (UMA) has become a driving concept behind a significant amount of research activities. One of MPEG’s (Moving Pictures Experts Group) responses to UMA is MPEG-21 Digital Item Adaptation (DIA). In this paper we present how tools as specified within DIA (i.e., normative XML-based description formats) are applied in streaming and constrained environments enabling piece-wise multimedia content adaptation including the adaptation decision-taking process and the actual resource adaptation in a coding format-independent way. Additionally, we demonstrate how the metadata overhead imposed by DIA tools can be reduced by means of appropriate metadata encoding tools.}, language = {EN}, pages = {115}, series = {TR/ITEC/05/2.13} } @Article{Goldschmidt2005, author = {Goldschmidt, Balázs and Tusch, Roland and Böszörmenyi, Laszlo}, journal = {Scalable Computing: Practice and Experience}, title = {A CORBA-based Middleware for an Adaptive Streaming Server}, year = {2005}, month = jul, number = {No 2}, pages = {83-92}, volume = {Vol 6}, address = {Timisoara, Romania}, language = {EN}, publisher = {SCPE} } @TechReport{Domokos2005, author = {Domokos, Csaba and Széll, Erika and Karpati, Peter and Böszörmenyi, Laszlo}, institution = {Institute of Information Technology ({ITEC}), Klagenfurt University}, title = {Mixed and Weighted Measures for Client Behavior Prediction in a Proactive Video Server}, year = {2005}, address = {Klagenfurt, Austria}, month = {jan}, number = {TR/ITEC/05/2.09}, abstract = {The precision of the predictors used in the ADMS[1] can be determined by similarity. There are already such measures[2] given, but we do not know exactly what efficiency they have and how well they show the difference between two lists. Kendall’s tau • Spearman’s footrule • Ulam’s distance We examined the characteristics of these similarity measures and developed some more measures that fit better our needs. One of the main goals is to consider the similarity more important at the begin of list, than at the end of list. Because the clients at the begin of the list probably will request more videos. During our work we defined 20 special ordered lists with 17 elements each. We tested the different measures on these lists. We also tested the Kemeny distance, which was defined in paper[3]. We modified the Spearman’s footrule and the Ulam’s distance according to the goal defined above (the top of the list considerate with higher weight (Weighted Spearman’s footrule, Weighted Ulam’s distance). Using the already known measures we developed a more complex, mixed measure, which uses more factors when defining the similarity. Finally we compared the 7 different measures using the artificially defined lists. With using the similarity measures we can tell how good the predictors[2] work in ADMS project. We could order the predictors by goodness, testing them on a real database (the World Cup ’98 Website’s access log).}, language = {EN}, pages = {40} } @TechReport{Cobarzan2005, author = {Cobarzan, Claudiu and Böszörmenyi, Laszlo}, institution = {Institute of Information Technology ({ITEC}), Klagenfurt University}, title = {Dynamic proxy-cache multiplication inside LANs}, year = {2005}, address = {Klagenfurt, Austria}, month = feb, number = {TR/ITEC/05/2.02}, abstract = {Proxy-cache deployment in the LANs has become a current practice aimed at increasing the availability of the data while also reducing client perceived latency, reduce the load on origin servers as well as the external network bandwidth consumption. As the load increases, due to an increase in client’s requests for both cached and non-cached data, it often happens that one single proxy-cache can not handle all the incoming requests. For those situations, when request dropping and cache replacement becomes necessary, we propose an alternative, namely proxy-cache splitting. Our solution is to dynamically deploy additional proxy-caches inside the LAN, and divert towards them some of the requests addressed to the original proxy-cache(s). By doing this we can achieve even better response time, load balancing, higher availability and robustness of the service than in the case in which a single proxy-cache is used.}, language = {EN}, pages = {22} } @InProceedings{Boeszoermenyi2005, author = {Böszörmenyi, Laszlo}, booktitle = {From Computer Literacy to Informatics Fundamentals}, title = {Teaching: People to People – About People (A plea for the historic and human view)}, year = {2005}, address = {Heidelberg, Germany}, editor = {Mittermeir, Roland}, month = feb, pages = {93-103}, publisher = {Springer Verlag}, series = {LNCS}, abstract = {The importance of the historical and human aspects of the didactics of informatics is discussed. The threefold human aspects of teaching: by, for and about people is explored. Using the example of the notion of the procedure, the potential of the historical discussion is investigated. A strengthening of the historical and human view is required both in university research and in the curricula of the informatics education at both secondary and university levels.}, issn = {978-3-540-253}, language = {EN}, talktype = {none} } @InProceedings{Szkaliczki2004, author = {Szkaliczki, Tibor and Böszörmenyi, Laszlo}, booktitle = {Distributed and Parallel Systems: Cluster and Grid Computing (DAPSYS 2004, Austrian-Hungarian Workshop on Distributed and Parallel Systems, Budapest, Hungary September 19-22, 2004)}, title = {Incremental Placement of Nodes in a Large-Scale Adaptive Distributed Multimedia Server}, year = {2004}, address = {New York [u. a.]}, editor = {Zoltan, Juhasz and Kacsuk, Peter and Kranzlmüller, Dieter}, month = {jan}, pages = {165-172}, publisher = {Springer}, series = {Kluwer International Series in Engineering and Computer Science}, issn = {0-387-23094-7}, language = {EN}, talktype = {none} } @TechReport{Spielvogel2004a, author = {Spielvogel, Christian and Böszörmenyi, Laszlo and Tusch, Roland}, institution = {Institute of Information Technology ({ITEC}), Klagenfurt University}, title = {Good enough Predictive QoS}, year = {2004}, address = {Klagenfurt, Austria}, month = {jan}, number = {TR/ITEC/04/2.14}, abstract = {We argue for the need of a tool that is able to provide QoS aware server applications with accurate information about current as well as predicted network characteristics. To address this issue, we present the design and evaluation of DANEF - a system that is able to estimate, process and forecast bottleneck bandwidth, available bandwidth, delay, jitter and loss of a certain path. Active measurements are performed by sending small ICMP packet trains and forecasts are performed by applying fast allgorithms that need only small initialization sets. The accuracy of the measurements is achieved by applying an efficient and innovative filtering mechanism, the correctness of the forecasts is achieved by dynamically selecting the best fitting forecast model and by considering the forecast error of previous samples. Our evaluation has shown that DANEF's measurement results are significantly more precise than those yield by the 5 most widely used tools called Bprobe, Cprobe, Pathload, Pathchar and Network Weather Service.}, language = {EN}, pages = {12} } @TechReport{Spielvogel2004, author = {Spielvogel, Christian and Böszörmenyi, Laszlo}, institution = {Institute of Information Technology ({ITEC}), Klagenfurt University}, title = {An alternative way of providing QoS without support from the network}, year = {2004}, address = {Klagenfurt, Austria}, month = {jan}, abstract = {We argue for the need of a tool that is able to provide QoS aware server applications with accurate information about current as well as predicted network characteristics. To address this issue, we present the design and evaluation of DANEF - a system that is able to estimate, process and forecast bottleneck bandwidth, available bandwidth, delay, jitter and loss of a certain path. Active measurements are performed by sending small ICMP packet trains and forecasts are performed by applying fast allgorithms that need only small initialization sets. The accuracy of the measurements is achieved by applying an efficient and innovative filtering mechanism, the correctness of the forecasts is achieved by dynamically selecting the best fitting forecast model and by considering the forecast error of previous samples. Our evaluation has shown that DANEF's measurement results are significantly more precise than those yield by the 5 most widely used tools called Bprobe, Cprobe, Pathload, Pathchar and Network Weather Service.}, language = {EN}, pages = {15} } @InProceedings{Libsie2004, author = {Libsie, Mulugeta and Kosch, Harald}, booktitle = {Multimedia Signal Processing, 2004 IEEE 6th Workshop on}, title = {Video Adaptation Using The Variation Factory}, year = {2004}, address = {Washington}, editor = {n, A}, month = sep, pages = {403-406}, publisher = {IEEE}, abstract = {Video adaptation is an active research area aiming at delivering heterogeneous content to yet heterogeneous devices under different network conditions. This paper presents an architecture for generating variations (different versions) from methods such as video transcoding, media conversion and summarization. The work in this paper concentrates on video data and aims to show video variation supported with metadata as an approach to adaptation to enable ubiquitous access. By video products are defined and the variation factory is introduced It generates different versions of the source and an MPEG-7 metadata document. The information contained in the metadata document helps the system to identify the most appropriate version that meets the required quality of service (QoS). In addition to the implementation of the commonly used reduction methods, two novel methods, viz. object-based and segment-based variations are introduced. Our proposals are implemented and experimentally validated.}, doi = {10.1109/MMSP.2004.1436578}, isbn10 = {0-7803-8578-0}, language = {EN}, talktype = {none} } @Article{Kosch2004, author = {Kosch, Harald and Moustefaoui, Ahmed and Böszörmenyi, Laszlo and Brunie, Lionel}, journal = {Multimedia Tools and Applications}, title = {Heuristics for Optimizing Multi-clip Queries in Video Databases}, year = {2004}, month = mar, number = {3}, pages = {235-262}, volume = {22}, abstract = {A multi-clip query requests multiple video clips. In this paper we address the multi-clip query optimization problem. We propose a new heuristics called Restricted Search Interval that maximizes clip sharing between queries and consequently reduces the workload of the video server. An adaptation of our heuristics for optimizing the response time of the query is presented as well. The experimental results show that the suggested heuristics reduces the server workload by about 68% in comparison to a classical heuristic approach.}, address = {Heidelberg, Germany}, language = {EN}, publisher = {Springer} } @TechReport{Karpati2004, author = {Karpati, Peter and Kocsor, A and Böszörmenyi, Laszlo}, institution = {Institute of Information Technology ({ITEC}), Klagenfurt University}, title = {Client Behaviour Prediction in a Proactive Video Server}, year = {2004}, address = {Klagenfurt, Austria}, month = {jan}, number = {TR/ITEC/04/2.18}, abstract = {We present a possibility how to add proactive behaviour to Video-on-Demand systems. To do so we propose categorizing videos and using external information as well as observing the behaviour of our clients. We examined 23 predictor functions on artificial and real datasets using different similarity measures to compare them. Our model is quite simple; therefore some extensions are proposed at the end.}, language = {EN}, pages = {15} } @InProceedings{Goldschmidt2004, author = {Goldschmidt, Balázs and Skaliczki, Tibnor and Böszörmenyi, Laszlo}, booktitle = {Eur-Par 2004, Parallel Processing}, title = {Placement of Nodes in an Adaptive Distributed Multimedia Server}, year = {2004}, address = {Pisa, Italy}, editor = {Danelutto, M and Laforenza, D and Vanneschi, M}, month = {jan}, pages = {776-783}, publisher = {Springer}, series = {LNCS}, abstract = {Multimedia services typically need not only huge resources but also a fairly stable level of Quality of Services. This requires server architectures that enable continuous adaptation. The Adaptive Distributed Multimedia Server (ADMS) of the University Klagenfurt is able to dynamically add and remove nodes to the actual configuration, thus realizing the offensive adaptation approach. This paper focuses on the optimal placement of nodes for hosting certain ADMS components (the so-called data collectors, collecting and streaming stripe units of a video) in the network. We propose four different algorithms for host recommendation and compare the results gained by running their implementations on different test networks. The greedy algorithm seems to be a clear looser. Among the three other algorithms (particle swarm, linear programming and incremental) there is no single winner of the comparison, they can be applied in a smart combination.}, issn = {0302-9743}, language = {EN}, talktype = {none} } @InProceedings{Tusch2003, author = {Tusch, Roland and Spielvogel, Christian and Kröpfl, Michael and Böszörmenyi, Laszlo}, booktitle = {Proceedings of Information Technologies and Communications (ITCom), Internet Multimedia Management Systems IV, Orlando, USA}, title = {An Adaptive Distributed Multimedia Streaming Server in Internet Settings}, year = {2003}, address = {Orlando}, editor = {Panchanathan, S and Zhang, T and Smith, JR}, month = {jan}, pages = {312-323}, publisher = {SPIE}, abstract = {We present an adaptive distributed multimedia server architecture (ADMS) that builds upon the idea of offensive adaptivity, where the server proactively controls its layout through replication or migration of server components to recommended hosts. Proactive actions are taken when network or server resources become critical when fulfilling client demands. Recommendations are provided by a so-called “host recommender” which represents an integral part of Vagabond2 - the middleware used for component distribution. Recommendations are based on measured or estimated server and network resource availabilities. Network distance and host resource metrics - obtained from network and host resource services respectively - may be communicated as MPEG-21 DIA descriptors. Finally we evaluate our architecture in a real-world streaming scenario.}, language = {EN}, talktype = {none}, url = {http://spie.org/conferences/programs/03/it/index.cfm?fuseaction=proceedings} } @Article{Podlipnig2003, author = {Podlipnig, Stefan and Böszörmenyi, Laszlo}, journal = {ACM Computing Surveys (CSUR)}, title = {A survey of Web cache replacement strategies}, year = {2003}, issn = {0360-0300}, month = dec, pages = {374 - 398}, volume = {Volume 35 , Issue 4}, abstract = {Web caching is an important technique to scale the Internet. One important performance factor of Web caches is the replacement strategy. Due to specific characteristics of the World Wide Web, there exist a huge number of proposals for cache replacement. This article proposes a classification for these proposals that subsumes prior classifications. Using this classification, different proposals and their advantages and disadvantages are described. Furthermore, the article discusses the importance of cache replacement strategies in modern proxy caches and outlines potential future research topics.}, address = {New York, USA}, language = {EN}, publisher = {ACM} } @Article{Kosch2003, author = {Kosch, Harald and Heuer, Jörg}, journal = {Informatik Spektrum}, title = {MPEG-7 Aktuelles Schlagwort}, year = {2003}, issn = {0170-6012}, month = apr, number = {2}, pages = {164}, volume = {26}, abstract = {Die Moving Picture Experts Group, eine Arbeitsgruppe der ISO SC29, ist seit 1988 aktiv und hat mit ihren MPEG-1/2/4 einen entscheidenden Einfluss auf die Multimedia-Industrie genommen.Mit der Verabschiedung MPEG-7 wurde von der Moving Picture Experts Group (MPEG) im März 2002 als Internationaler Standard verabschiedet. Nach der erfolgreichen Einführung der Standards MPEG-1/2/4 zur audiovisuellen Kodierung von Inhalten ist MPEG-7 ein Standard, der ein Austauschformat für Beschreibungen von multimedialen Inhalten festlegt.}, address = {Heidelberg}, language = {DE}, publisher = {Springer}, url = {http://www.ifi.uni-klu.ac.at/ITEC/Publications/showabs?pnr=2003-0194-HKAJ} } @InProceedings{Doeller2003, author = {Döller, Mario and Kosch, Harald}, booktitle = {SPIE Conference on Multimedia Computing and Networking 2003 (MMCN03), Santa Clara, CA, January 29-31, 2003}, title = {An MPEG-7 Multimedia Data Cartridge}, year = {2003}, address = {Santa Clara, USA}, editor = {Rajkumar, Ragunathan}, month = jan, pages = {240}, publisher = {SPIE}, series = {Electronic Imaging Science and Technology}, abstract = {Broadly used Database Management Systems (DBMS) are not able to tackle the requirements of multimedia in querying, indexing and content modeling. Therefore, extenders for multimedia data types have been proposed. These extensions, however, offer only limited semantic modeling and rely on basic index structures which do not meet the whole nature of multimedia, for instance for a Nearest-Neighbor Search. In this context, the paper presents a methodology for enhancing extensible ORDBMS for multimedia data. In particular, we introduce an MPEG-7 Multimedia Data Cartridge which includes a semantically rich metadata model for multimedia content relying on the MPEG-7 standard. Furthermore, to fulfill the needs for efficient multimedia query processing, we created in this Cartridge a new indexing and query framework for various types of retrieval operations}, isbn10 = {9780819448194}, issn = {0-89298-244-5}, language = {EN}, talktype = {none}, url = {http://www.fim.uni-passau.de/fileadmin/files/lehrstuhl/kosch/Papers/2003/2003-0257-HKAM.pdf} } @InProceedings{Boeszoermenyi2003a, author = {Böszörmenyi, Laszlo and Tusch, Roland}, booktitle = {Suchbilder. Visuelle Kultur zwischen Algorithmen und Archiven}, title = {Inhaltsbasierte Suche in Videoarchiven}, year = {2003}, address = {Berlin}, editor = {Heidenreich, Ernst}, month = {jan}, pages = {67-75}, publisher = {Kulturverlag Kadmos}, abstract = {Bei der Indizierung von Videoarchiven haben im allgemeinen bessere Ergebnisse einen höheren Preis. Automatische Indizierung, basierend auf physikalischen Eigenschaften, kann für viele Bereiche (wie z.B. ein Grossteil der Unterhaltung) ausreichend gute Ergebnisse erzielen. Sie ist allerdings in der Genauigkeit der Fragestellungen eingeschränkt, und zwingt uns – oft unbewusste – Suchkriterien auf. Wenn es uns wichtig ist, auf fein differenzierte Fragen genaue Antworten zu erhalten (wie das z.B. in wissenschaftlich/technischen Systemen meistens der Fall ist), so sind wir auf eine zumindest teilweise manuelle Annotierung angewiesen. In einem kombinierten System – wie dem VIDEX-Modell – können die physikalischen Eigenschaften dazu benutzt werden, den manuellen Annotierungsprozess zu erleichtern. Kombinierte Systeme dieser Art bieten beide Arten der Indizierung an und kombinieren sie miteinander. Längerfristig ist zu erwarten, dass sich zu jeder Anwendung die angemessenen Indizierungs- und Suchmethoden herausstellen. Die zwei Verfahren – das automatische und das teils manuelle – sollten nicht als Gegner, sondern als Partner angesehen werden.}, issn = {3-931659-35-6}, language = {DE}, talktype = {none} } @TechReport{Boeszoermenyi2003, author = {Böszörmenyi, Laszlo and Tusch, Roland and Goldschmidt, Balázs}, institution = {Institute of Information Technology ({ITEC}), Klagenfurt University}, title = {A Mobile Agent-based Infrastructure for an Adaptive Multimedia Server}, year = {2003}, address = {Klagenfurt, Austria}, month = {jan}, abstract = {This paper introduces a mobile agent-based infrastructure for an adaptive multimedia server enabling a dynamic migration or replication of certain multimedia applications among a set of available server nodes. It discusses the requirements from both, the server’s and the middleware’s point of view to each other and comes up with a specification and implementation of a CORBA-based interface between them.}, language = {EN}, pages = {12} } @InProceedings{Podlipnig2002, author = {Podlipnig, Stefan and Böszörmenyi, Laszlo}, booktitle = {IEEE International Conference on Multimedia and Expo (ICME)}, title = {Replacement Strategies for Quality Based Video Caching}, year = {2002}, address = {Lausanne, Schweiz}, editor = {Swiss, Federal Institute of Technology}, month = aug, pages = {5}, publisher = {IEEE}, abstract = {Due to the future dominance of video data video caching will be an important performance factor in future networked multimedia systems. A major component of video caches is the replacement strategy. This paper presents replacement strategies for video caches that incorporate quality reduction and the use of metadata given by the content provider. The strategies are evaluated by simulation.}, issn = {0780373049}, language = {EN}, talktype = {none} } @InProceedings{Libsie2002, author = {Libsie, Mulugeta and Kosch, Harald}, booktitle = {Proceedings of the tenth ACM international conference on Multimedia}, title = {Content Adaptation of Multimedia Delivery and Indexing using MPEG-7.}, year = {2002}, address = {New York, USA}, editor = {Rowe, Lawrence and Merialdo, Bernard and Muehlhaeuser, Max and Ross, Keith and Dimitrova, Nevenka}, month = dec, pages = {644-646}, publisher = {ACM}, abstract = {This work introduces a framework for adapting MPEG-4 intra- and inter-Elementary Streams and for encoding the results in an MPEG-7 stream to be used for resource adaptation on the delivery path to the user.}, doi = {10.1145/641007.641134}, isbn10 = {1-58113-620-X}, keywords = {MPEG-7, MPEG4, multimedia indexing, resource adaptation}, language = {EN}, talktype = {none} } @InProceedings{Kosch2002d, author = {Kosch, Harald and Döller, Mario}, booktitle = {Proceedings of the 10th International Conference on Multimedia, Antibes, France, Nov. to Dec. 2002.}, title = {Demonstration of an MPEG-7 Multimedia Data Cartridge.}, year = {2002}, address = {New York, NY, USA}, editor = {Rowe, Lawrence and Merialdo, Bernard and Muehlhaeuser, Max and Ross, Keith and Dimitrova, Nevenka}, month = dec, pages = {85-86}, publisher = {ACM Press}, abstract = {Multimedia Database Systems (MMDBMS) organize and store multimedia data for content retrieval. The relying multimedia data models represent abstractions of media objects for querying, indexing, and so on. However, most currently available implementations reval shortcomings. Either they are limited by one kind of multimedia data supported or by the capacity of their semantic modelling. Despite the upcoming MPEG-7 standard for representing low-level and high-level features of multimedia and respective annotation and use tools (see http://www.mpeg-industry.com), we are not aware of any MMDBMS product which integrates this standard for the purpose of a more meaningful indexing and querying. In this context, our paper presents a Multimedia Data Cartridge (MDC) for demonstration at ACM Multimedia 2002 that implements an object-relational data model for the core part of the MPEG-7 standard. It is an open and extensible system realized with the Oracle Data Cartridge technology. Oracle offers with that technology a mechanism for extending the capabilities of an Oracle database (e.g., type system, query processing and indexing) for the users needs. Besides the more effective modelling of multimedia content, efficient retrieval was considered. Efficient query processing is guaranteed through new database indexing mechanisms. Innately, most database systems provide only a limited number of integrated access methods such as B-trees. Available multimedia database extension packages (e.g., DataBlades of Informix) rarely handle indexing of d-dimensional data (e.g., feature vectors with d>2) or advanced similarity search functionalities (e.g., k-NN search). These circumstances limit the use of database systems in multimedia. For overcoming this drawback, we introduce an Multimedia Indexing Framework (MIF) relying on the GiST framework. Finally, in order to use the MMDBMS we provide query and presentation interfaces which automatically adapt to their usage environment.}, doi = {10.1145/641007.641024}, language = {EN}, pdf = {https://www.itec.aau.at/bib/files/p85-doller.pdf}, talktype = {none} } @Article{Kosch2002c, author = {Kosch, Harald and Moustefaoui, A and Brunie, Lionel}, journal = {Multimedia Tools and Applications}, title = {Semantic based Prefetching in News-on-Demand Video Server}, year = {2002}, month = nov, pages = {159-179}, volume = {Vol 18}, abstract = {The Multimedia Description Standard MPEG-7 is an International Standard since February 2002. It defines a huge set of description classes for multimedia content, for its creation and its communication. This article investigates what MPEG-7 means to Multimedia Database Systems (MMDBSs) and vice versa. We argue that MPEG-7 has to be considered complementary to, rather than competing with, data models employed in MMDBSs. Finally we show by an example scenario how these technologies can reasonably complement one another..}, address = {Heidelberg, Germany}, language = {EN}, publisher = {Springer}, url = {http://www.springerlink.com/content/gr9uwpdmlk2varl6/} } @InProceedings{Kosch2002b, author = {Hameurlain, Abdelkader and Morvan, Franck and Tomsich, Philipp and Bruckner, Robert M and Kosch, Harald and Brezany, Peter}, booktitle = {Database and Expert Systems Applications, Aix-en-Provence, France, Proceedings of the 13th International Conference on Database and Expert Systems Applications}, title = {Mobile query optimization based on agent-technology for distributed data warehouse and OLAP applications}, year = {2002}, address = {Berlin [u. a.]}, editor = {Hameurlain, Abdelkader and Cicchetti, Rosine and Traunmüller, Roland}, month = sep, pages = {795-799}, publisher = {Springer Verlag}, series = {Lecture Notes in Computer Science}, abstract = {This book constitutes the refereed proceedings of the 13th International Conference on Database and Export Systems Applications, DEXA 2002, held in Aix-en-Provence, France, in September 2002. The 89 revised full papers presented together with three invited papers and a position paper were carefully reviewed and selected from 241 submissions. The papers are organized in topical sections on Web, workflow, data warehouses and datamining, applications, XML, distributed systems, knowledge engineering, advanced databases, queries, information retrieval, and indexing.}, issn = {3-540-44126-3}, language = {EN}, talktype = {none}, url = {http://dl.acm.org/citation.cfm?id=646130.679339} } @Article{Kosch2002a, author = {Kosch, Harald and Atnafu, Solomon}, journal = {Information Processing Letter}, title = {A Multimedia Join by the Method of Nearest Neighbour Search}, year = {2002}, issn = {0020-0190}, month = jun, number = {Issue 5}, pages = {269-276}, volume = {Vol. 82}, abstract = {Multimedia databases; Processing of a multimedia join; Nearest neighbor search.}, address = {Oxford, UK}, language = {EN}, pdf = {https://www.itec.aau.at/bib/files/2002-0002-HKAS.pdf}, publisher = {Elsev}, url = {http://www.sciencedirect.com/science?} } @Article{Kosch2002, author = {Kosch, Harald}, journal = {Sigmod Records, ACM Press}, title = {MPEG-7 and Multimedia Database Systems}, year = {2002}, month = jun, number = {No. 2}, pages = {34-39}, volume = {Vol. 31}, address = {New York, NY, USA}, doi = {http://doi.acm.org/10.1145/565117.565123}, language = {EN}, publisher = {ACM}, url = {http://www.acm.org/sigmod/record/issues/0206/index.html} } @InProceedings{Boeszoermenyi2002, author = {Böszörmenyi, Laszlo and Tusch, Roland and Goldschmidt, Balázs}, booktitle = {Distributed and parallel systems: cluster and grid computing}, title = {A Mobile Agent-based Infrastructure for an Adaptive Multimedia Server}, year = {2002}, address = {Boston}, editor = {Kacsuk, Peter and Kranzlmüller, Dieter and Nemeth, Zsolt and Volkert, Jens}, month = {jan}, pages = {141-148}, publisher = {Kluwer Academic Publishers/Springer Verlag}, abstract = {This paper introduces a mobile agent-based infrastructure for an adaptive multimedia server enabling a dynamic migration or replication of certain multimedia applications among a set of available server nodes. It discusses the requirements from both, the server’s and the middleware’s point of view to each other and comes up with a specification and implementation of a CORBA-based interface between them.}, issn = {1-4020-7209-0}, language = {EN}, talktype = {none} } @InProceedings{Kosch2001c, author = {Kosch, Harald and Böszörmenyi, Laszlo and Bachlechner, Alexander and Hanin, Christian and Hofbauer, Christian and Lang, Margit and Riedler, Carmen and Tusch, Roland}, booktitle = {VLDB 2001, Proceedings of 27th International Conference on VeryLarge Data Bases, Roma, Italy, September, 11-14, 2001}, title = {SMOOTH-A Distributed Multimedia Database System}, year = {2001}, address = {Orlando, Fla.}, editor = {Apers, P M G and Atzeni, P and Ceri, St and Paraboschi, St and Ramamohanarao, K and Snodgrass, KT}, month = sep, pages = {713-714}, publisher = {Morgan Kaufmann}, issn = {1-55860-804-4}, language = {EN}, pdf = {https://www.itec.aau.at/bib/files/P713.pdf}, talktype = {none} } @InProceedings{Kosch2001a, author = {Kosch, Harald and Sampaio P, Falcone and Hameurlain, A and Brunie, Lionel}, booktitle = {Euro-Par 2001: Parallel Processing 7th International Euro-Par Conference Manchester, UK August 28-31, 2001, Proceedings}, title = {Parallel and Distributed Databases, Data Mining and Knowledge Discovery}, year = {2001}, address = {Berlin [u. a.]}, editor = {Sakellariou, R and Keane, J and Gurd, J and Freeman, L}, month = aug, pages = {278-279}, publisher = {Springer Verlag}, series = {LNCS}, issn = {3-540-42495-4}, language = {EN}, talktype = {none} } @InProceedings{Kosch2001, author = {Kosch, Harald and Döller, Mario and Böszörmenyi, Laszlo}, booktitle = {Multimedia Databases and Image Communication, Second International Workshop MDIC 2001, Amalfi, Italy, September 17-18, 2001; Proceedings}, title = {Content-based Indexing and Retrieval Supported by Mobile Agent Technology}, year = {2001}, address = {Berlin [u. a.]}, editor = {Tucci, M}, month = {jan}, pages = {152-165}, publisher = {Springer Verlag}, series = {LNCS}, abstract = {This book constitutes the refereed proceedings of the Second International Workshop on Multimedia Databases and Image Communication, MDIC 2001, held in Amalfi, Italy, in September 2001. The 16 revised full papers presented together with two invited papers were carefully reviewed and selected for inclusion in the book. The papers are organised in topical sections on image and visual computing applications, multimedia technology, image and visual information querying and browsing, and video indexing and communication.}, issn = {3-540-42587-X}, language = {EN}, talktype = {none} } @TechReport{Boeszoermenyi2001a, author = {Böszörmenyi, Laszlo and Becker, Christian and Kosch, Harald and Stary, Christian}, institution = {Institute of Information Technology ({ITEC}), Klagenfurt University}, title = {Quality of Service in Distributed Object Systems and Distributed Multimedia Object/Component Systems}, year = {2001}, address = {Klagenfurt, Austria}, month = {jan}, number = {TR/ITECC/01/2.05}, abstract = {The workshop investigated, to what extent can component technology help to enhance the quality of distributed multimedia systems. Especially, to what extent can we achieve better reuse of multimedia content, reuse of code, interoperability, portability and performance. All authors agreed upon the necessity of building distributed multimedia systems of components as opposed to monolithic systems. The granularity of the components is an open issue, it can be stated, however, that most contributors presented solutions with rather heavy-weight components. Some of the presentations required explicitly standardization of multimedia formats, both for content and meta data. Most presenters touched the topic of multimedia-aware standardized middleware. Available middleware standards still do not support to a sufficient extent techniques to provide a guaranteed quality of service, and fit thus not well to be used for distributed multimedia. Multimedia system providers are often not interested to publish their interfaces. Thus, even if the internal design is component-oriented, the rest of the world has not much gain from this. Academic research can push openness and have a positive influence on industry. KEYWORDS Distributed Multimedia Systems, Quality of Service, Middleware, Component based Distributed Multimedia Systems, Adaptivity.}, language = {EN}, pages = {22} } @InProceedings{Atnafu2001a, author = {Atnafu, Solomon and Brunie, Lionel and Kosch, Harald}, booktitle = {International Database Engineering and Applications Symposium (IDEAS) 2001, July 2001, Proceedings}, title = {Similarity -Based Operators and Query Optimization for Multimedia Database Systems}, year = {2001}, address = {Los Alamitos, Calif. [u.a.]}, editor = {Adiba, ME and Collet, Ch and Bipin, C}, month = jul, pages = {346-355}, publisher = {IEEE Computer Society}, issn = {0-7695-1140-6}, language = {EN}, talktype = {none} } @InProceedings{Atnafu2001, author = {Atnafu, Solomon and Brunie, Lionel and Kosch, Harald}, booktitle = {Advances in Web-Age Information Management. Second International Conference, WAIM 2001, Xi'an, China, July 9-11, 2001. Proceedings}, title = {Similarity-Based Operators in Image Database Systems}, year = {2001}, address = {Berlin [u. a.]}, editor = {Wang, XS and Yu, G and Lu, H}, month = {jan}, pages = {14-25}, publisher = {Springer Verlag}, series = {LNCS}, issn = {3-540-42298-6}, language = {EN}, talktype = {none} } @InProceedings{Tusch2000, author = {Tusch, Roland and Kosch, Harald and Böszörmenyi, Laszlo}, booktitle = {Proceedings ACM Multimedia 2000 : Los Angeles, California, October 30 - November 4, 2000}, title = {VIDEX: Integrated Generic Video Indexing Approach}, year = {2000}, address = {Reading, Mass.}, editor = {Ghandeharizadeh, Shahram and Chang, Shih-Fu and Fischer, Stephen and Konstan, Joseph A and Nahrstedt, Klara}, month = dec, pages = {448-451}, publisher = {ACM}, isbn10 = {1-58113-198-4}, issn = {0-2014-8566-4}, language = {EN}, talktype = {none} } @InProceedings{Moustefaoui2000, author = {Moustefaoui, Ahmed and Kosch, Harald and Böszörmenyi, Laszlo and Brunie, Lionel}, booktitle = {Proceedings of IEEE Conference Multimedia and Expo. ICME 2000: 30 July - 2 August 2000, New York, USA/ IEEE Signal Processing Society}, title = {Multi-Clip Query Optimization in Video Databases}, year = {2000}, address = {Piscataway, NJ}, editor = {Basu, Sankar}, month = {jan}, pages = {363-366}, publisher = {IEEE Servoce Center}, abstract = {A multi-clip query requests multiple video clips. We address the multi-clip query optimization problem. We propose a new heuristic called restricted search interval that maximizes clip sharing between queries and consequently reduces the workload of the video server. The experimental results show that the suggested heuristics reduce the server workload by about 68.7% in comparison to a classical heuristic approach.}, doi = {10.1109/ICME.2000.869616}, issn = {0-7803-6536-4}, language = {EN}, location = {New York}, pdf = {https://www.itec.aau.at/bib/files/00869616.pdf}, subtitle = {IEEE Interantional Conference on Multimedia & Expo 2000}, talkdate = {2000.08.31}, talktype = {registered}, url = {http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=869616&tag=1} } @InProceedings{Kosch2000e, author = {Kosch, Harald and Tusch, Roland and Böszörmenyi, Laszlo and Bachlechner, Alexander and Dörflinger, Bernhard and Hofbauer, Christian and Riedler, Carmen}, booktitle = {Proceedings ACM Multimedia 2000 : Los Angeles, California, October 30 - November 4, 2000}, title = {The SMOOTH Video DB -Demonstration of an Integrated Generic Indexing Approach}, year = {2000}, address = {Reading, Mass.}, editor = {Ghandeharizadeh, Shahram and Chang, Shih-Fu and Fischer, Stephen and Konstan, Joseph and Nahrstedt, Klara}, month = dec, pages = {448-451}, publisher = {Addison-Wesley [u. a.]}, isbn10 = {1-58113-198-4}, language = {EN}, pdf = {https://www.itec.aau.at/bib/files/10.1.1.87.1278.pdf}, talktype = {none} } @InProceedings{Kosch2000d, author = {Kosch, Harald and Breidler, Kurt and Böszörmenyi, Laszlo}, booktitle = {Distributed and Parallel Systems - From Concepts to Architectures}, title = {The Parallel Video Server SESAME-KB}, year = {2000}, address = {Boston, Mass.}, editor = {Kacsuk, Peter and Kotsis, Gabriele}, month = sep, pages = {151-154}, publisher = {Kluwer Academic Publ}, series = {The Kluwer international series in engineering and computer science}, abstract = {This paper presents the parallel video server SESAME-KB, by the means of its architectural design, striping, scheduling, caching and admission policy. Furthermore we compare our prototype to approaches which influenced our realization. Keywords: Parallel Video Server, Parallel Systems and Communication.}, issn = {0-7923-7892-X}, language = {EN}, talktype = {none} } @InProceedings{Kosch2000c, author = {Kosch, Harald}, booktitle = {Dexa 2000 Workshop Proceedings, W 10, Greenwich (UK), Sept 2000, Tutorial Abstract}, title = {CORBA, Web and Databases}, year = {2000}, address = {Greenwich, London}, editor = {Tjoa, A M and Wagner, R and Al-Zobaidie, A}, month = sep, pages = {674}, publisher = {IEEE CS Press}, issn = {0-7695-0680-1}, language = {EN}, talktype = {none} } @InProceedings{Kosch2000b, author = {Kosch, Harald and Breidler, Kurt and Böszörmenyi, Laszlo}, booktitle = {11th International Workshop on Database and Expert Systems Applications (DEXA'00)6-8 September 2000 , Greenwich, London}, title = {A Comparative Study of Selected Parallel Video Servers}, year = {2000}, address = {U.K., Greenwich}, editor = {Tjoa, A M and Wagner, R R and Al-Zobaidie, A}, month = sep, pages = {669-673}, publisher = {IEEE CS Press}, abstract = {This paper compares different selected and representative parallel video servers, including our server SESAME-KB, by the means of their architectural design, striping, scheduling, caching and admission policy. It is shown that these parallel video servers can support a high number of concurrent accesses, but will also reveal missing components, as bottlenecks. Finally we point to further developments}, doi = {10.1109/DEXA.2000.875095}, isbn10 = {0-7695-0680-1}, language = {EN}, talktype = {none} } @InProceedings{Kosch2000a, author = {Kosch, Harald and Slota, Renata and Nikolow, Darin and Podlipnig, Stefan and Breidler, Kurt}, booktitle = {High-Performance Computing and Networking, 8th International Conference, HPCN Europe 2000 Amsterdam, May 8-10, 2000 Proceedings}, title = {MMSRS-Multimedia Storage and Retrieval System for a Distributed System}, year = {2000}, address = {Berlin [u. a.]}, editor = {Bubak, Marian}, month = may, pages = {517-524}, publisher = {Springer Verlag}, series = {LNCS}, abstract = {The Multimedia Storage and Retrieval System described in this paper is aimed at storing and retrieving medical multimedia data such as images and videos. There are three significant problems that automatically need to be addressed: providing enough capacity to fit Terabytes of MPEG files, efficient extraction of video fragments from MPEG files and quality of service issues. We are working on two different approaches to build MMSRS. The first one, described in this article, utilizes commercial HSM software for managing the tertiary storage hardware. The second approach that we have started to investigate is an attempt to build a specialised storage management system from scratch.}, doi = {10.1007/3-540-45492-6_52}, issn = {3-540-67553-1}, language = {EN}, talktype = {none}, url = {http://www.springerlink.com/content/r334107699313461/} } @Article{Kosch2000, author = {Kosch, Harald}, journal = {Future Generation Computer Systems}, title = {Managing the operator ordering problem in parallel data-Bases}, year = {2000}, month = may, number = {No 3}, pages = {665-676}, volume = {Vol 16}, abstract = {This paper focuses on parallel query optimization. We consider the operator problem and introduce a new class of execution strategies called Linear-oriented Bushy Trees (LBT). Compared to the related approach of the General Bushy Trees (GBT) a significant complexity reduction of the operator ordering problem can be derived theoretically and demonstrated experimentally (e.g. compared with GBTs, LBTs authorize optimization time improvement that can reach up to 49%) without losing quality. Finally we demonstrate that existing commercial parallel query optimizers need little extension mod ifications in order to handle LBTs.}, address = {Langford Lane, Kidlington, Oxford OX5 1GB, United Kingdom}, keywords = {Parallel databases, Parallel query optimization, Linear-oriented Bushy Trees, Extending existing optimizers}, language = {EN}, pdf = {https://www.itec.aau.at/bib/files/1998-0039-Kosc.pdf}, publisher = {Elsevier} } @Article{Hoelzl2000, author = {Hölzl, Günter and Böszörmenyi, Laszlo}, journal = {Future Generation Computer Systems}, title = {Distributed Federative QoS Resource Managment-Extended version}, year = {2000}, month = apr, number = {Issue 6, No 16}, pages = {717-725}, volume = {Vol. 16}, address = {Oxford, United Kingdom}, language = {EN}, pdf = {https://www.itec.aau.at/bib/files/2000-0019-GHAL.pdf}, publisher = {Elsevier} } @Article{Boeszoermenyi2000, author = {Böszörmenyi, Laszlo}, journal = {APL-Journal}, title = {Computer im Kindergarten?}, year = {2000}, issn = {1438-4531}, month = {jan}, number = {Nr. 1}, pages = {29-33}, volume = {Jg. 19}, abstract = {Es läuft eine spannende Diskussion darüber, wie früh man Kinder an den Computer heranführen sollte. Jenseits solcher Intellektuellen-Diskussionen machen manche Firmen schon seit Jahren enorme Geschäfte mit Software und Hardware für Kinder im Kindergartenalter. Auch der erste Computer für Babys hat schon seinen Siegeszug auf dem amerikanischen Markt angetreten. Mit den Geschäftemachern zu diskutieren, ist wahrscheinlich nicht viel klüger als gegen Windmühlen zu kämpfen. Diese Firmen könnten ihre Geschäfte nicht machen, wenn es nicht viele Eltern, Großeltern, Pädagogen und Psychologen gäbe, die den Computer kleinen Kindern mit guter Absicht in die Hand geben. Die folgende Diskussion spricht die wohlwollenden Erwachsenen an, die sich für Kinder verantwortlich fühlen und sich nicht entscheiden können, wann und wie Kinder mit dem Phänomen Computer konfrontiert werden sollten.}, address = {Mannheim, Berlin, Nürnberg, Germany}, language = {DE}, pdf = {https://www.itec.aau.at/bib/files/p008EZ-01-1997.pdf}, publisher = {APL-Journal}, url = {http://www.rhombos.de/shop/c/file/000189/APL12000.pdf} } @InProceedings{Kosch1999, author = {Kosch, Harald and Slota, R and Böszörmenyi, Laszlo and Kitowski, J and Otfinowski, J and Wójcik, P}, booktitle = {High-Performance Computing and Networking}, title = {A Distributed Medical Information System for Multimedia Data - The first Years Experience of the PARMED Project}, year = {1999}, address = {Berlin [u. a.]}, editor = {Bubak , M and Williams, R and Afsarmanesh, H and Hertzberger, B}, month = apr, pages = {543-546}, publisher = {Springer Verlag}, series = {LNCS}, issn = {3-540-67553-1}, language = {EN}, talktype = {none} } @Article{Boeszoermenyi1999h, author = {Böszörmenyi, Laszlo}, journal = {Tani-Tani}, title = {Computer az óvodában?}, year = {1999}, month = dec, pages = {4-14}, address = {Budapest, Hungary}, language = {HU}, publisher = {Tani-Tani} } @Article{Boeszoermenyi1999g, author = {Böszörmenyi, Laszlo}, journal = {APL-Journal}, title = {Parallel Programming}, year = {1999}, month = nov, number = {Nr. 2}, pages = {85-89}, volume = {Jg. 18}, address = {Mannheim, Berlin, Nürnberg, Germany}, language = {EN}, publisher = {APL-Journal} } @InProceedings{Boeszoermenyi1999f, author = {Böszörmenyi, Laszlo}, booktitle = {Proceedings of the Workshop on Object-Oriented Technology}, title = {Introducing OO with Bottom-up Approach, Structured First}, year = {1999}, address = {Berlin, Heidelberg, New York}, editor = {Moreira, Ana and Demeyer, Serge}, month = oct, pages = {340-342}, publisher = {Springer Verlag}, series = {LNCS}, abstract = {Object-Oriented Technology.}, edition = {1743}, issn = {3-540-66954-X}, language = {EN}, location = {Lisbon, Portugal}, talkdate = {1999.06.16}, talktype = {registered} } @InProceedings{Boeszoermenyi1999e, author = {Böszörmenyi, Laszlo and Eisner, Robert and Groiss, Herbert}, booktitle = {10th DEXA 1999 Workshop Proceedings, Sept 1-3 1999, Florence, Italy}, title = {Adding Distribution to a Workflow Managment System}, year = {1999}, address = {Los Alamitos, Calif. [u. a.]}, editor = {Bench-Capon, Trevor and Soda, Giovanni and Tjoa, A Min}, month = sep, pages = {17-21}, publisher = {IEEE CS Press}, abstract = {The Workflow Management System AltaVista Works has been extended to be able to process workflows in a distributed, partly even parallel manner. Build-time data are replicated over all participating workflow servers. The distribution of workflow execution is based on migration. Instead of the usual static re-partitioning, a highly dynamic management of distribution is applied.}, doi = {10.1109/DEXA.1999.795118}, issn = {0-7695-0281-4}, language = {EN}, talktype = {none} } @InProceedings{Boeszoermenyi1999d, author = {Böszörmenyi, Laszlo and Kosch, Harald and Schordan, Markus}, booktitle = {Proceedings of the 3rd International Austrian-Israeli Technion Symposium}, title = {JavaSet - extending Java by persistent sets}, year = {1999}, address = {Wien}, editor = {Gutmann, Helmut}, month = apr, pages = {58-66}, publisher = {Austrian Technion Society}, issn = {3-9501023-0-2}, language = {EN}, pdf = {https://www.itec.aau.at/bib/files/10.1.1.47.3866.pdf}, talktype = {none} } @InProceedings{Boeszoermenyi1999c, author = {Böszörmenyi, Laszlo and Kosch, Harald and Slota, Renata}, booktitle = {Proceedings of the 3rd International Austrian-Israeli Technion Symposium, 26.-27. April 1999, RISC Linz, Austrian Technion Society}, title = {PARMED-Information system for long distance collaboration in medicine}, year = {1999}, address = {Wien}, editor = {Gutmann, Helmut}, month = apr, pages = {157-164}, publisher = {Austrian Technion Society}, abstract = {This paper describes the PARMED project initiative The aim of PARMED is to provide medical stu with a large virtual database of image and video data distributed over several medical centers Clients can access the PARMED system by an active client software which provides graphical interfaces to query the virtual database Incoming video streams and image data is postprocessed by the active client software to allow analysis of this data for diagnostics or virtual teaching Quality of service and security aspects are crucial for such kind of distributed system and will be addressed with priority}, issn = {3-9501023-0-2}, language = {EN}, pdf = {https://www.itec.aau.at/bib/files/1999-0001-BoKS.pdf}, talktype = {none} } @InProceedings{Boeszoermenyi1999b, author = {Böszörmenyi, Laszlo and Hölzl, Günter and Pirker, Emanuel}, booktitle = {Parallel Computatuin. 4th International ACPC Conference Including Special Tracks on Parallel Numerics (ParNum'99) and Parallel Computing in Image Processing, Video Processing, and Multimedia Salzburg, Austria, February 16-18, 1999, Proceedings}, title = {Parallel Cluster Computing with IEEE-1394}, year = {1999}, address = {Berlin [u. a.]}, editor = {Zinterhof, Peter and Vajtersic, Marian and Uhl, Andreas}, month = feb, pages = {552-532}, publisher = {Springer Verlag}, series = {LNCS}, abstract = {Diverging demands on computer networks, such as high bandwidth, guaranteed quality of service and low latency lead to growing heterogeneity. IEEE1394-1995 is a standardized low-cost highperformance serial-bus-system with both isochronous and asynchronous operation. It might be an interesting candidate for all-round local and system area networks, providing a good compromise in fulfilling the above demands for low costs. Beside providing some technical background we show the possibilities and advantages of building parallel clusters on top of IEEE1394-1995. The main advantage is that minimal speed-up can be guaranteed, as shown on the basis of the parallel implementation of discrete Fourier transformation.}, isbn10 = {3-540-65641-3}, issn = {3-540-65641-3}, language = {EN}, pdf = {https://www.itec.aau.at/bib/files/1999-0003-BoHP.pdf}, talktype = {none} } @Article{Boeszoermenyi1999a, author = {Böszörmenyi, Laszlo and Stopper, Andreas}, journal = {Simulation Practice and Theory}, title = {Semi-automatic parallelization of object-oriented simulations}, year = {1999}, issn = {0928-4869}, month = {jan}, number = {Issue 4}, pages = {295-307}, volume = {Vol. 7}, abstract = {An approach is introduced for semi-automatic parallelization of object-oriented simulations. The basic idea is to prepare parallelization at the earliest possible stage in the life-cycle of the creation of new simulations (i.e. at modeling), thus minimizing causality conflicts at run-time. The object-oriented model of a simulation is enriched by hints, describing the estimated load and communication costs between major classes and objects. This helps to grasp the inherent parallelism of the model. Based on this additional information, a partitioning with minimal communication between partitions can be generated automatically. Remaining dependency-conflicts must be resolved at run-time. The GoSim [A. Stopper, GoSim, ein Ansatz zur Beschleunigung diskreter, objektorientierter, verteilter Simulationen, Ph.D. Thesis, Institute of Informatics, University Klagenfurt, 1997] simulation system is presented, which implements the described proposal and provides semi-automatic parallelization of large-scale and/or high-performance simulations. It provides a description language, a partitioning tool, a program-skeleton generator and a simulation engine. Some measurements prove the usability of the approach.}, address = {Oxford, United Kingdom}, language = {EN}, publisher = {Elsevier} } @InProceedings{Boeszoermenyi1999, author = {Böszörmenyi, Laszlo and Wickner, Andreas and Wolf, Harald}, booktitle = {Euro-Par 1999, Parallel Processing, Proceedings of 5th International EuroPar Conference, Toulouse, France, August 31 - September 3, 1999}, title = {Performance Evaluation of Object Oriented Middleware}, year = {1999}, address = {Berlin [u. a.]}, editor = {Amestoy, Patrick and Berger, Philippe and Daydé, Michael and Duff, Iain and Frayssé, Valerie and Giraud, Luc and Ruiz, Daniel}, month = {jan}, pages = {258-261}, publisher = {Springer Verlag}, series = {LCNS}, abstract = {A method for evaluating several aspects of the performance of object oriented middleware is introduced. Latency, data transfer, parameter marshalling and scalability are considered. A portable benchmark toolkit has been developed to implement the method. A number of actual middleware products have been measured, such as C++ and Java based CORBA implementations, DCOM and Java/RMI. The measurements are evaluated and related to each other.}, doi = {10.1007/3-540-48311-X_31}, isbn10 = {978-3-540-66443-7}, issn = {3-540-66443-2}, language = {EN}, talktype = {none}, url = {http://www.enseeiht.fr/events/europar99/} } @InProceedings{Angster1999, author = {Angster, Erzsébet and Bergin, Joseph and Böszörmenyi, Laszlo}, booktitle = {Object-Oriented Technology: ECOOP´99 Workshop Reader; ECOOP´99 Workshops, Panels, and Poster: Lisbon, Portugal, June 14-18, 1999; Proceedings}, title = {Introducing OO Programming - with Special Emphasis on Concrete Examples}, year = {1999}, address = {Berlin [u. a.]}, editor = {Demeyer, Serge and Moreira, A}, month = {jan}, pages = {338-358}, publisher = {Springer Verlag}, abstract = {This book constitutes the joint refereed post-proceedings of 20 workshops, one panel session, and one poster session held during the 13th European Conference on Object-Oriented Programming, ECOOP'99, in Lisbon, Portugal in June 1999. The volume presents overviews of the 20 workshops as well as more than 200 individual short presentations by the contributing authors in a coherent and systematic way. The wealth of up-to-date information provided spans the whole spectrum of object technology, from theoretical and foundational issues to applications in various domains.}, doi = {10.1007/3-540-46589-8_20}, issn = {3-540-66954-X}, language = {EN}, talktype = {none}, url = {http://www.springerlink.com/content/8fxf7j38q9vtbd0u/} } @InProceedings{Amme1999, author = {Amme, Wolfram and Schordan, Markus and Böszörmenyi, Laszlo and Rossak, Willibald}, booktitle = {Object-Oriented Technology, ECOOP 99 Workshop Reader. ECOOP´99 Workshops, panels, posters, Lisbon, Portugal, June 14-18, 1999 Proceedings}, title = {PAOLA-Program Analysis of Object-Oriented Languages}, year = {1999}, address = {Berlin [u. a.]}, editor = {Moreiera, Anna and Demeyer, Serge}, month = oct, pages = {143-146}, publisher = {Springer Verlag}, series = {LNCS}, abstract = {Aliasing in Object-Oriented Systems.}, issn = {3-540-66954-X}, language = {EN}, location = {Lisbon, Portugal}, talktype = {none} } @InProceedings{Boeszoermenyi1998b, author = {Böszörmenyi, Laszlo and Kosch, Harald}, booktitle = {High-Performance Computing and Networking}, title = {High Performance Sets}, year = {1998}, address = {Heidelberg}, editor = {Sloot, Peter and Bubak, Marian and Hertzberger, Bob}, month = apr, pages = {972-974}, publisher = {Springer}, series = {LNCS}, abstract = {This short paper presents a system offering parallel persistent and polymorphic sets of objects, on the level of an existing general purpose object-oriented programming language, like Modula-3 and JAVA. The user of such a system gets distribution and persistence in the same natural way, as users of traditional systems get volatile arrays of numbers of objects. In addition, advantages are taken from sophisticated optimization techniques.}, issn = {3-540-64443-1}, language = {DE}, talktype = {none} } @InProceedings{Boeszoermenyi1998a, author = {Böszörmenyi, Laszlo and Weich, Carsten}, booktitle = {Proceedings of Database and Expert Systems Applications (DEXA '98)}, title = {Simple and Efficient Transactions for a Distributed Object Store}, year = {1998}, address = {Wien}, editor = {Wagner, Roland}, month = {jan}, pages = {693-698}, publisher = {IEEE}, abstract = {Even the more or less "canonical'', lower-level architecture of information systems needs to be revisited from time to time. Notions like persistence and transactions belong traditionally to the area of database management systems. There are, however, many applications, such as CAD, VLSI design or simulation, which need persistence and could take advantage of transactions, but require especially fast implementations not provided by DBMS. In this paper we are describing a low-level transaction concept used to implement our parallel main memory object store (PPOST), to provide main memory access times combined with the safety and convenience of transactions.}, doi = {10.1109/DEXA.1998.707480}, isbn10 = {0-8186-8353-8}, issn = {0818683538}, language = {EN}, pdf = {https://www.itec.aau.at/bib/files/00707480.pdf}, talktype = {none} } @Article{Boeszoermenyi1998, author = {Böszörmenyi, Laszlo}, journal = {Software - Concepts \& Tools}, title = {Why Java is not my favorite first-course language}, year = {1998}, issn = {0945-8115}, month = {jan}, number = {Volume 19, Number 3}, pages = {141-145}, abstract = {The choice of the first-course programming language for a university-level computer science curriculum has pedagogical ramifications in terms of comprehensibility and mastery of fundamental concepts. This paper compares the merits of Java and Modula-3 as a first-course language.}, address = {Berlin, Heidelberg, New York}, doi = {10.1007/s003780050017}, language = {EN}, pdf = {https://www.itec.aau.at/bib/files/1998_LB_Java.pdf}, publisher = {Springer} } @InProceedings{Boeszoermenyi1997c, author = {Böszörmenyi, Laszlo and Mittermeir, Roland}, booktitle = {Modular Programming Language}, title = {Choosing Modula-3 as "Mother Tongue"}, year = {1997}, address = {Heidelberg}, editor = {Mössenböck, Hans-Peter}, month = mar, pages = {382}, publisher = {Springer}, series = {LNCS}, abstract = {Choosing the "First Computer Language" is still a crucial issue. While the debate is quite often conducted on the language level, the arguments for making the choice are rather of much deeper methodological, didactical, and non-technical nature. Here, we describe the decision process that lead us to choose Modula-3 as the first language to be taught to informatics students at the Universität Klagenfurt and report on the experience gained.}, issn = {0302-9743}, language = {EN}, talktype = {none} } @Article{Boeszoermenyi1997b, author = {Böszörmenyi, Laszlo}, journal = {Erziehungskunst - Monatsschrift zur Pädagogik Rudolf Steiners}, title = {Informatik in der Schule}, year = {1997}, month = feb, pages = {113-121}, address = {Stuttgart, Germany}, language = {DE}, pdf = {https://www.itec.aau.at/bib/files/EZ-02-1997.pdf}, publisher = {Erziehungskunst}, url = {http://www.erziehungskunst.de/archiv/jahrgang-1990-1999/jahrgang-1997/februar-1997/} } @Article{Boeszoermenyi1997a, author = {Böszörmenyi, Laszlo and Eder, Karl-Heinz and Weich, Carsten}, journal = {Simulations Practice and Theory}, title = {A Very Fast Parallel Object Store for Very Fast Applications}, year = {1997}, month = {jan}, pages = {605-622}, volume = {Volume 5, Numbers 7-8}, abstract = {An architecture for a memory-resident, Parallel and Persistent ObjectSTore (PPOST) is suggested. Different object-oriented databases might be built on top of PPOST. The term memory-resident (or main memory based) means that the primary storage device is main memory. Persistence is guaranteed automatically by managing secondary and stable storage devices (such as main memory with uninterrupted power supply, discs and tapes). The architecture is able to take advantage of available main memory in a parallel or distributed environment. Thus, transactions can be actually performed with memory-speed, without being limited by the size of the memory of a given computer. Such an architecture is especially advantageous for applications requiring very fast answers, such as CAD or high-performance simulation.}, address = {Oxford, United Kingdom}, language = {EN}, pdf = {https://www.itec.aau.at/bib/files/1997-0041-BoEW.pdf}, publisher = {Elsevier} } @Article{Boeszoermenyi1997, author = {Böszörmenyi, Laszlo and Eder, Karl-Heinz}, journal = {Parallel Computing}, title = {M3Set - A Language for Handling of Distributed and Persistent Sets of Objects}, year = {1997}, month = {jan}, number = {13}, pages = {1897-1912}, volume = {22}, abstract = {We claim that distributed object-oriented systems must provide a higher level of abstraction to their users, than usually provided. Especially, it is necessary to provide application-oriented, intelligent aggregates of objects with transparent distribution of their elements. Beside that, it seems to be not only reasonable, but also relatively easy to connect persistence with distribution. A system, offering distributed and persistent polymorphic sets of objects, on the level of a clean, type safe programming language is introduced. The user of such a system gets distribution and persistence in the same "natural" way, as users of traditional systems get volatile arrays of numbers or classes of objects.}, address = {Oxford, United Kingdom}, keywords = {Distributed object management, Parallel distributed languages, Parallel distributed databases, Object-oriented languages, Modula-3}, language = {EN}, publisher = {Elsevier}, url = {http://www.sciencedirect.com/science/article/pii/S0167819196000841} } @InProceedings{Eder1996, author = {Eder, Karl-Heinz and Böszörmenyi, Laszlo}, booktitle = {DEXA '96 Proceedings of the 7th International Workshop on Database and Expert Systems Applications}, title = {Optimized Parallel Sets for Data Intensive Applications}, year = {1996}, address = {Heidelberg}, editor = {Wagner, Roland and Thoma, Helmut}, month = sep, pages = {185}, publisher = {Springer Verlag}, series = {LNCS}, abstract = {An extension of a general-purpose programming language (gpPL) is presented. It enables parallelism, persistence and query optimization based on sets. The authors demonstrate that in gpPLs the primitive "set" can be generalised for the needs of database and expert system applications. Side-effect free declarative queries, based on set expressions, can be optimized and executed in parallel. Individual optimization and parallelization are integral parts of the language system and compiler. Very different combinations of persistent or volatile, and parallel or sequential, and optimized or non-optimized implementations are possible. This is eased by the fact that a great part of the implementation is located outside the compiler with the help of predefined interfaces. Different algebras, optimizers or algorithms can be considered. The same program can be executed without modification in various systems or platforms.}, doi = {http://doi.ieeecomputersociety.org/10.1109/DEXA.1996.558293}, edition = {LNCS 1134}, isbn10 = {0-8186-7662-0}, issn = {3-540-61656-X}, language = {EN}, talktype = {none} } @InProceedings{Boeszoermenyi1996b, author = {Böszörmenyi, Laszlo and Stopper, Andreas}, booktitle = {Directory of Simulation Software, 1996}, title = {Acceleration of Distributed, Object-Oriented Simulations Using a Graph-Optimizing Approach}, year = {1996}, address = {Genoa, Italy}, editor = {Bruzzone, Agostino and Kerckhoffs, Eugene}, month = {jan}, pages = {56}, publisher = {Society for Computer Simulation International}, series = {Proceedings of ESS´96, Genoa, Italy}, abstract = {An approach to accelerate distributed, object-oriented simulations is presented in this paper. It is based on the assumption that a higher acceleration can be achieved in an easier way, if the problem is alread tackled early at the modeling stage [STOP 95]. The user adds hints about the communication behavior and frequencies of object classes to the simulation model. Based on this information, an object graph is generated and distributed to a selected number of partitions. The distribution phase is fully automatic. As a result a distribution of the problem nearby the communication optimum is generated. In the next phase the distributed simulation program (code) is generated. In a final step the user only has to code the methods of the object classes and run the simulation. The major advantage of this approach is that the user is freed from the difficult task of finding a good distribution for the problem to be simulated, which is an important factor for the overall performance of the simulation. Another advantage is the possibility to vary model information (hints) about the communication, and get a new (quasi optimal) version of the simulation automatically generated.}, issn = {1-565-55099-4}, language = {EN}, pdf = {https://www.itec.aau.at/bib/files/1996-0020-StBo.pdf}, talktype = {none} } @InCollection{Boeszoermenyi1996a, author = {Böszörmenyi, Laszlo}, booktitle = {25 Jahre Universität Klagenfurt}, publisher = {Carinthia GmbH}, title = {Woher kommt die Information?}, year = {1996}, address = {Klagenfurt, Austria}, editor = {Klagenfurt, Universitaet}, month = {jan}, pages = {278}, issn = {3-9500593-0-X}, language = {DE} } @InProceedings{Boeszoermenyi1995a, author = {Böszörmenyi, Laszlo and Stopper, Andreas}, booktitle = {Eurosim´95}, title = {A Distributed, Object Oriented Simulation System based on Hints}, year = {1995}, address = {Vienna}, editor = {Breitenecker, Felix and Husinsky, Irmgard}, month = sep, pages = {1356}, publisher = {Elsevier}, series = {Proceedings of the 1995 EUROSIM Conference}, abstract = {A hint-based, distributed, discrete, object-oriented simulation system is described. In course of the design phase of the simulation model, explicit hints can be provided concerning dependencies and information flow inside the model. The process of parallelization consists of two major steps. In the first step, the abstract model, enriched with user-supplied hints is mapped onto an arbitrary number of active units. In the second step, the active units are mapped onto a given number of physical nodes, characterized by their processing capacity and by the communication latency between them. The distribution scheme may be dynamic, i.e. simulation objects can change their location in course of the simulation, in order to get better performance. Klaus.Leopold 05.04.2001.}, issn = {0-444-82241-0}, language = {EN}, talktype = {none} } @InProceedings{Boeszoermenyi1994b, author = {Böszörmenyi, Laszlo and Eder, Karl-Heinz}, booktitle = {Proceedings of the Joint Modular Languages Conference}, title = {Adding Parallel and Persistent Sets to Modula-3}, year = {1994}, address = {Ulm}, editor = {Schulthess, Peter}, month = sep, pages = {201-216}, publisher = {Universitätsverlag Ulm}, abstract = {Parallel and persistent object sets are suggested to be incorporated into general-purpose programming languages. Two alternative implementations are presented. The actual form of the proposal is an extension of Modula-3.}, language = {EN}, location = {Ulm}, pdf = {https://www.itec.aau.at/bib/files/1994-0012-BoEd.pdf}, talkdate = {1994.09.28}, talktype = {registered} } @Article{Boeszoermenyi1994, author = {Böszörmenyi, Laszlo}, journal = {Erziehungskunst - Monatsschrift zur Pädagogik Rudolf Steiners}, title = {Phantasie und TV-Gewalt}, year = {1994}, month = mar, number = {3}, pages = {210-212}, volume = {58. Jahrgang}, address = {Stuttgart, Germany}, language = {DE}, publisher = {Erziehungskunst}, url = {http://www.erziehungskunst.de/archiv/jahrgang-1990-1999/jahrgang-1994/maerz-1994/} } @Article{Boeszoermenyi1993a, author = {Böszörmenyi, Laszlo}, journal = {Didaktische Zeitschrift des IST-Zentrums Linz}, title = {Informatik in der Grundschule}, year = {1993}, month = {jan}, pages = {15-17}, address = {Linz, Austria}, language = {DE}, publisher = {Interdisziplinäre Zentrum für Soziale Kompetenz} } @Article{Boeszoermenyi1993, author = {Böszörmenyi, Laszlo}, journal = {Structured Programming}, title = {A Comparison of Modula-3 and Oberon-2: extended version}, year = {1993}, month = {jan}, number = {1}, pages = {15-22}, volume = {Volume 14}, address = {Berlin, Heidelberg, New York}, language = {EN}, publisher = {Springer} } @Article{Boeszoermenyi1992a, author = {Böszörmenyi, Laszlo}, journal = {Informatik in der Schule - Informatik für die Schule}, title = {Informatik und Wissenschaftsgeschichte}, year = {1992}, issn = {3205055322}, month = sep, pages = {not available}, volume = {10}, abstract = {Informatik in der Schule - Informatik für die Schule.}, address = {Vienna, Austria}, language = {DE}, publisher = {Böhlau} } @InProceedings{Boeszoermenyi1992, author = {Böszörmenyi, Laszlo}, booktitle = {Proceedings of the 7th Joint Conference of the Austrian Computer Society (OCG) and the John von Neumann Society for Computing Sciences (NJSZT), Klagenfurt, 1992}, title = {A Comparison of Modula-3 and Oberon-2}, year = {1992}, address = {Berlin, Heidelberg, New York}, editor = {Mittermeir, Roland}, month = {jan}, pages = {126-137}, publisher = {Springer}, abstract = {Proceedings of the 7th Joint Conference of the Austrian Computer Society (OCG) and the John von Neumann Society for Computing Sciences (NJSZT), Klagenfurt, 1992.}, issn = {3211824081}, language = {EN}, location = {Klagenfurt}, talkdate = {--}, talktype = {none} }