[23] | Benjamin Rainer, Christian Timmerer, Self-Organized Inter-Destination Multimedia Synchronization For Adaptive Media Streaming, In Proceedings of the 22st ACM International Conference on Multimedia (ACM, ed.), ACM, New York, NY, USA, pp. 10, 2014.
[bib][url] [pdf] [abstract]
Abstract: Social networks have become pervasive and have changed the way of social interaction. The traditional TV experience drifts from an event tied to a certain place with the family or friends to a location-independent and distributed social experience. Additionally, more and more video on-demand services adopt a pull-based streaming approach. In order to provide a synchronized and distributed TV experience we introduce a self-organized Inter-Destination Multimedia Synchronization (IDMS) framework for adaptive media streaming. In particular, we extend the principles of IDMS to adaptive media streaming over HTTP (i.e., MPEG-DASH) and enable a synchronized multimedia playback among geographically distributed clients. Therefore, we introduce session management to MPEG-DASH and for negotiating on a reference playback timestamp among the participating peers in an IDMS session we propose a distributed control scheme. We evaluate our proposed scheme with respect to scalability and time required for negotiating on the reference playback timestamp. Furthermore, we investigate how to compensate the identified asynchronism by using adaptive media playout with respect to the Quality of Experience (QoE). Therefore, we define a temporal distortion measure for audio and video which allows us to model the impact of playback rate variations on the QoE. This measure is evaluated by conducting a subjective quality assessment using crowdsourcing.
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[22] | Benjamin Rainer, Christian Timmerer, Quality of Experience of Web-based Adaptive HTTP Streaming Clients in Real-World Environments using Crowdsourcing, In First International Workshop on VideoNext: Design, Quality and Deployment of Adaptive Video Streaming (N N, ed.), ACM, Australia, Sydney, pp. 1-6, 2014.
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[21] | Benjamin Rainer, Christian Timmerer, A Quality of Experience Model for Adaptive Media Playout, In Sixth International Workshop on Quality of Multimedia Experience (QoMEX 2014) (Stefan Winkler, ed.), IEEE, Singapore, Singapore, pp. 1-4, 2014.
[bib] [pdf] [abstract]
Abstract: In the past decade Adaptive Media Playout (AMP) has been intensively studied with respect to the detection of when to increase or decrease the playback rate in order to maintain a certain buffer fill state. In this paper we subjectively assess the QoE of AMP with respect to non-periodically and randomly selected content sections of a video sequence by us- ing crowdsourcing. Furthermore, we introduce features that allow to quantify the distortion for audio and video that are caused by increasing or decreasing the playback rate. With these preliminaries we study the correlation between the introduced features and the subjectively assessed QoE. Therefore, we derive a utility model that allows to estimate the QoE with the introduced features. We instantiate and validate the model by the use of the data gathered by the conducted study.
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[20] | Christian Raffelsberger, Hermann Hellwagner, Combined Mobile Ad-Hoc and Delay/Disruption-Tolerant Routing, In Proceedings of the 13th International Conference on Ad-hoc, Mobile, and Wireless Networks (ADHOC-NOW '14) (Song Guo, Pietro Manzoni, Jaime Lloret, Stefan Ruehrup, eds.), Springer, vol. 8487, Berlin Heidelberg, pp. 1-14, 2014.
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[19] | Manfred Jürgen Primus, Segmentation and Indexing of Endoscopic Videos, In Proceedings of the ACM International Conference on Multimedia (n/a n/a, ed.), ACM, New York, NY, USA, pp. 659-662, 2014.
[bib] [abstract]
Abstract: Over the last few years it has become common to archive video recordings of endoscopic surgeries. These videos are of high value for medics, junior doctors, patients and hospital management but currently they are used rarely or not at all. Each day tens to hundreds of hours of new videos are added to archives without metadata that would support content-based search. In order to fully utilize these videos it is necessary to analyze the content of the recordings. Endoscopic videos are in some aspects fundamentally different to other types of videos. Therefore, pre-existing content-based analysis methods must be tested for their ability to operate with this kind of video and, if required, they must be adopted or new methods must be found. Especially, we address video segmentation and indexing in this work. We present our preliminary work and ideas for future work to add content-based information to endoscopic videos.
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[18] | Daniel Posch, Christian Kreuzberger, Benjamin Rainer, Hermann Hellwagner, Using In-Network Adaptation to Tackle Inefficiencies Caused by DASH in Information-Centric Networks, In Proceedings of the 10th International Conference on Emerging Networking Experiments and Technologies, VideoNext Workshop (Colin Dixon, ed.), ACM Digital Library, New York, NY, USA, pp. 1-6, 2014.
[bib] [pdf] [abstract]
Abstract: The consumption of audio-visual content is the most dominant traffic source in today's Internet. Novel architectural approaches, such as Information-Centric Networking (ICN), are developed to support efficient multimedia dissemination. As ICN and MPEG-DASH have several concepts in common, recent proposals consider a fusion of both technologies. However, MPEG-DASH relies on pure client-driven adaptation. This often rather selfish adaptation strategy inhibits benefits gained from ICN's inherent caching and multi-path transmission capabilities. In order to overcome this challenge, the contribution of this work is the integration of in-network adaptation (INA) in ICN. We illustrate that INA can be realized despite ICN's content-based security model. Our proposal rests on scalable content, which enables INA without management and transmission overhead.
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[17] | Daniel Posch, Christian Kreuzberger, Benjamin Rainer, Hermann Hellwagner, Client Starvation: A Shortcoming of Client-driven Adaptive Streaming in Named Data Networking, In Proceedings of the 1st ACM Conference on Information-Centric Networking (Paulo Mendes, ed.), ACM Digital Library, New York, NY, USA, pp. 1-2, 2014. (to appear)
[bib][url] [doi] [pdf] [abstract]
Abstract: Information-centric Networking (ICN) as a potential Future Internet architecture has to efficiently support the consumption of multimedia content. Recent proposals consider the reuse of MPEG-DASH to provide adaptive streaming in ICN. Due to the fact that MPEG-DASH relies on pure client-driven adaptation, it encounters difficulties dealing with ICN's inherent caching and multi-path transmission. By conducting simulations using the concrete ICN approach Named Data Networking (NDN), we show that pure client-driven adaptation leads to shortcomings. Furthermore, we propose to use in-network adaptation based on scalable content for overcoming these shortcomings in NDN.
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[16] | Daniela Pohl, Social Media Analysis for Crisis Management: A Brief Survey, In E-Letter on Social Media Analysis for Crisis Management, IEEE Computer Society Special Technical Community on Social Networking (STCSN), vol. 2, no. 1, http://stcsn.ieee.net/e-letter/vol-2-no-1, pp. 1-10, 2014.
[bib][url] |
[15] | Daniela Pohl, Abdelhamid Bouchachia, Hermann Hellwagner, Crisis-related Sub-Event Detection Based on Clustering, In E-Letter on Social Media Analysis for Crisis Management, IEEE Computer Society Special Technical Community on Social Networking (STCSN), vol. 2, no. 1, http://stcsn.ieee.net/e-letter/vol-2-no-1, pp. 1-10, 2014, IEEE Computer Society Special Technical Community on Social Networking E-Letter.
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[14] | Bernd Münzer, Klaus Schoeffmann, Laszlo Böszörmenyi, Johannes Franciscus Smulders, Jack J Jakimowicz, Investigation of the Impact of Compression on the Perceptional Quality of Laparoscopic Videos, In 27th International Symposium on Computer-Based Medical Systems (CBMS'14) (Marina Krol, ed.), IEEE, New York City, USA, pp. 153-158, 2014.
[bib] |
[13] | Amro Al-Akkad, Christian Raffelsberger, Alexander Boden, Leonardo Ramirez, Andreas Zimmermann, Tweeting 'When Online is Off'? Opportunistically Creating Mobile Ad-hoc Networks in Response to Disrupted Infrastructure, In Proceedings of the 11th International Conference on Information Systems for Crisis Response and Management (ISCRAM '14) (Star Roxanne Hiltz, Mark S Pfaff, Linda Plotnick, Patrick C Shih, eds.), The Pennsylvania State University, USA, University Park, Pennsylvania, USA, pp. 657-666, 2014.
[bib] [pdf] |
[12] | Amro Al-Akkad, Christian Raffelsberger, How do I get this App? A Discourse on Distributing Mobile Applications Despite Disrupted Infrastructure, In Proceedings of the 11th International Conference on Information Systems for Crisis Response and Management (ISCRAM '14) (Star Roxanne Hiltz, Mark S Pfaff, Linda Plotnick, Patrick C Shih, eds.), The Pennsylvania State University, USA, University Park, Pennsylvania, USA, pp. 560-564, 2014.
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[11] | Marco Andrea Hudelist, Klaus Schoeffmann, David Ahlström, Evaluating Alternatives to the 2D Grid Interface for Mobile Image Browsing, In International Journal of Semantic Computing, World Scientific, Singapore, pp. 25, 2014.
[bib][url] [doi] |
[10] | Marco Andrea Hudelist, Claudiu Cobârzan, Klaus Schoeffmann, OpenCV Performance Measurements on Mobile Devices, In Proceedings of International Conference on Multimedia Retrieval (Joemon Jose, Keith Van Rijsbergen, eds.), ACM, New York, NY, USA, pp. 479:479-479:482, 2014.
[bib][url] [doi] |
[9] | Tobias Hoßfeld, Christian Keimel, Christian Timmerer, Crowdsourcing Quality-of-Experience Assessments, In Computer, IEEE Computer Society, vol. 47, no. 9, Los Alamitos, CA, USA, pp. 98-102, 2014.
[bib] [doi] [pdf] [abstract]
Abstract: Crowdsourced quality-of-experience (QoE) assessments are more cost-effective and flexible than traditional in-lab evaluations but require careful test design, innovative incentive mechanisms, and technical expertise to address various implementation challenges.
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[8] | Tobias Hoßfeld, Matthias Hirth, Pavel Korshunov, Philippe Hanhart, Bruno Gardlo, Christian Keimel, Christian Timmerer, Survey of Web-based Crowdsourcing Frameworks for Subjective Quality Assessment, In 2014 IEEE International Workshop on Multimedia Signal Processing (MMSP 2014) (Susanto Rahardja, Zhengyou Zhang, Fernando Pereira, Alexander Loui, eds.), IEEE, Piscataway, N.J. 08854, U.S.A., pp. 6, 2014.
[bib] [pdf] [abstract]
Abstract: The popularity of the crowdsourcing for performing various tasks online increased significantly in the past few years. The low cost and flexibility of crowdsourcing, in particular, attracted researchers in the field of subjective multimedia evalua- tions and Quality of Experience (QoE). Since online assessment of multimedia content is challenging, several dedicated frameworks were created to aid in the designing of the tests, including the support of the testing methodologies like ACR, DCR, and PC, setting up the tasks, training sessions, screening of the subjects, and storage of the resulted data. In this paper, we focus on the web-based frameworks for multimedia quality assessments that support commonly used crowdsourcing platforms such as Amazon Mechanical Turk and Microworkers. We provide a detailed overview of the crowdsourcing frameworks and evaluate them to aid researchers in the field of QoE assessment in the selection of frameworks and crowdsourcing platforms that are adequate for their experiments.
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[7] | Stefan Lederer, Christopher Mueller, Christian Timmerer, Hermann Hellwagner, Adaptive Multimedia Streaming in Information-Centric Networks, In IEEE Network, IEEE, vol. 28, no. 6, IEEE Communications Society, pp. 91-96, 2014.
[bib] [abstract]
Abstract: ICN has received a lot of attention in recent years, and is a promising approach for the Future Internet design. As multimedia is the dominating traffic in today's and (most likely) the Future Internet, it is important to consider this type of data transmission in the context of ICN. In particular, the adaptive streaming of multimedia content is a promising approach for usage within ICN, as the client has full control over the streaming session and has the possibility to adapt the multimedia stream to its context (e.g. network conditions, device capabilities), which is compatible with the paradigms adopted by ICN. In this article we investigate the implementation of adaptive multimedia streaming within networks adopting the ICN approach. In particular, we present our approach based on the recently ratified ISO/IEC MPEG standard Dynamic Adaptive Streaming over HTTP and the ICN representative Content-Centric Networking, including baseline evaluations and open research challenges.
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[6] | Torsten Andre, Karin Anna Hummel, Angela Schoellig, Evsen Yanmaz, Mahdi Asadpour, Christian Bettstetter, Pasquale Grippa, Hermann Hellwagner, Stephan Sand, Siwei Zhang, Application-Driven Design of Aerial Communication Networks, In IEEE Communications Magazine, IEEE, vol. 52, no. 5, IEEE Communications Society, pp. 129-137, 2014.
[bib] [abstract]
Abstract: Networks of micro aerial vehicles (MAVs) equipped with various sensors are increasingly used for civil applications, such as monitoring, surveillance, and disaster management. In this article, we discuss the communication requirements raised by applications in MAV networks. We propose a novel system representation that can be used to specify different application demands. To this end, we extract key functionalities expected in an MAV network. We map these functionalities into building blocks to characterize the expected communication needs. Based on insights from our own and related real-world experiments, we discuss the capabilities of existing communications technologies and their limitations to implement the proposed building blocks. Our findings indicate that while certain requirements of MAV applications are met with available technologies, further research and development is needed to address the scalability, heterogeneity, safety, quality of service, and security aspects of multi-MAV systems.
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[5] | Hermann Hellwagner, The BRIDGE Project - Bridging Resources and Agencies in Large-Scale Emergency Management, In E-Letter on Social Media Analysis for Crisis Management, IEEE Computer Society Special Technical Community on Social Networking (STCSN), vol. 2, no. 1, http://stcsn.ieee.net/e-letter/vol-2-no-1, pp. 1-10, 2014, IEEE Computer Society Special Technical Community on Social Networking E-Letter.
[bib][url] [abstract]
Abstract: BRIDGE is a European collaborative project established within the Security Research sector of the European Commission. The basic goal of BRIDGE is to contribute to the safety of citizens by developing technical and organisational solutions that improve crisis and emergency management in EU member states. A (middleware) platform is being developed that is to provide technical support for multi-agency collaboration in large-scale emergency relief efforts. Several tools and software systems are being implemented and tested to support first responders in their efforts. Beyond technical considerations, organisational measures are being explored to ensure interoperability and cooperation among involved parties; social, ethical and legal issues are being investigated as well. A focus of the project is to demonstrate and validate its results in the course of real-world emergency response exercises. Since most of the BRIDGE work is beyond the scope of this e-letter on social networking, only a brief overview of the BRIDGE goals and work will be given. However, one thread of work is relevant in the context of social networking and deserves to be covered more closely: automatic detection of notable sub-events of a crisis from social networks. This activity makes use of crisis-related information coming from citizens via social networks and thus contributes to building an improved operational picture in a crisis situation and to better planning and performing crisis response tasks.
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[4] | Gheorghita Ghinea, Christian Timmerer, Weisi Lin, Stephen Gulliver, Mulsemedia: State of the Art, Perspectives, and Challenges, In ACM Transactions on Multimedia Computing, Communications, and Applications (TOMM), ACM, vol. 11, no. 1s, New York, NY, USA, pp. 17:1-17:23, 2014.
[bib] [pdf] [abstract]
Abstract: Mulsemedia—multiple sensorial media—captures a wide variety of research efforts and applications. This article presents a historic perspective on mulsemedia work and reviews current developments in the area. These take place across the traditional multimedia spectrum—from virtual reality applications to computer games—as well as efforts in the arts, gastronomy, and therapy, to mention a few. We also describe standardization efforts, via the MPEG-V standard, and identify future developments and exciting challenges the community needs to overcome.
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[3] | Gheorghita Ghinea, Christian Timmerer, Weisi Lin, Stephen Gulliver, Guest Editorial: Special Issue on Multiple Sensorial (MulSeMedia) Multimodal Media: Advances and Applications, In ACM Transactions on Multimedia Computing, Communications, and Applications (TOMM), ACM, vol. 11, no. 1s, New York, NY, USA, pp. 9:1-9:2, 2014.
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[2] | Claudiu Cobarzan, Marco Andrea Hudelist, Manfred Del Fabro, Content-Based Video Browsing with Collaborating Mobile Clients, In MultiMedia Modeling, 20th Anniversary International Conference (C Gurrin, F Hopfgartner, W Hurst, H Johansen, H Lee, N O'Connor, eds.), Springer, Berlin, Germany, pp. 402-406, 2014.
[bib] |
[1] | Claudiu Cobarzan, Klaus Schoeffmann, How do Users Search with Basic HTML5 Video Players?, In Proceedings of the 20th International Conference on MultiMedia Modeling (MMM2014) (Noel O'Connor, Wolfgang Hurst, Hyowon Lee, Cathal Gurrin, eds.), Springer, Berlin Heidelberg, pp. 12, 2014.
[bib] |