[602] | Jakub Lokoc, Bernd Münzer, Klaus Schoeffmann, Manfred del Fabro, Manfred Jürgen Primus, Tomas Skopal, Jan Lansky, What are the Salient Keyframes in Short Casual Videos? An Extensive User Study using a new Video Dataset, In Proceedings of the 2015 IEEE International Conference on Multimedia & Expo Workshops (ICMEW) (Matteo Cesana, ed.), IEEE, Los Alamitos, CA, pp. 1-6, 2015.
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[601] | Christian Kreuzberger, Benjamin Rainer, Hermann Hellwagner, Modelling the Impact of Caching and Popularity on Concurrent Adaptive Multimedia Streams in Information-Centric Networks, In IEEE International Conference on Multimedia Expo Workshops (Cesana Matteo, ed.), IEEE, Los Alamitos, CA, USA, pp. 1-6, 2015.
[bib] [doi] [pdf] [abstract]
Abstract: The Internet is nowadays mainly used for streaming of multimedia content, something it was not built for originally. To guarantee user satisfaction, one of the key concepts of the Internet as we know it is bandwidth sharing. While this concept is necessary to provide stability in the network, several issues can arise with adaptive multimedia streaming, e.g., efficiency and stability. Considering Information-Centric Networking (ICN) and its network-inherent caching, those issues tend to become worse. Many researchers have proposed to use traffic shaping on the server to enable fair bandwidth sharing and stabilize clients. However, existing research does not consider content popularity and in-network caching. The contribution of this paper is two-fold. First, we propose a cache-aware traffic shaping policy, in order to guarantee seamless playback of videos. Second, based on content popularity, we calculate an average video quality achieved by this traffic shaping policy for various cache sizes, to show the impact of popularity and caching for multimedia streaming in ICN.
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[600] | Christian Kreuzberger, Daniel Posch, Hermann Hellwagner, A Scalable Video Coding Dataset and Toolchain for Dynamic Adaptive Streaming over HTTP, In Proceedings of the 6th ACM Multimedia Systems Conference (Tsang Ooi Wei, ed.), ACM, New York, NY, USA, pp. 213-218, 2015.
[bib][url] [doi] [pdf] [abstract]
Abstract: With video streaming becoming more and more popular, the number of devices that are capable of streaming videos over the Internet is growing. This leads to a heterogeneous device landscape with varying demands. Dynamic Adaptive Streaming over HTTP (DASH) offers an elegant solution to these demands. Smart adaptation logics are able to adjust the clients' streaming quality according to several (local) parameters. Recent research indicated benefits of blending Scalable Video Coding (SVC) with DASH, especially considering Future Internet architectures. However, except for a DASH dataset with a single SVC encoded video, no other datasets are publicly available. The contribution of this paper is two-fold. First, a DASH/SVC dataset, containing multiple videos at varying bitrates and spatial resolutions including 1080p, is presented. Second, a toolchain for multiplexing SVC encoded videos is provided, therefore making our results reproducible and allowing researchers to generate their own datasets.
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[599] | Marco Andrea Hudelist, Klaus Schoeffmann, Qing Xu, Improving Interactive Known-Item Search in Video with the Keyframe Navigation Tree, In Proceedings of the 21st International Conference on MultiMedia Modelling 2015 (MMM 2015) (Xiangjian He, Suhuai Luo, eds.), Springer, Berlin, Heidelberg, New York, pp. 12, 2015.
[bib] |
[598] | Hermann Hellwagner, Severin Kacianka, Adaptive Video Streaming for UAV Networks, In MoVid '15 Proceedings of the 7th ACM International Workshop on Mobile Video (Pal Halvorsen, Nikil Dutt, eds.), ACM International Conference on Multimedia Systems, New York, USA, pp. 25-30, 2015. (to appear)
[bib] [doi] [abstract]
Abstract: The core problem for any adaptive video streaming solution, particularly over wireless networks, is the detection (or even prediction) of congestion. IEEE 802.11 is especially vulnerable to fast movement and change of antenna orientation. When used in UAV networks (Unmanned Aerial Vehicles), the network throughput can vary widely and is almost impossible to predict. this paper evaluates an approach originally developed by Kofler for home networks, in a single-hop UAV wireless network setting: the delay between the sending of an IEEE 802.11 packet and the receipt of its corresponding acknowledgement is used as an early indicator of the link quality and as a trigger to adapt (reduce or increase) the video stream' s bitrate. Our real-world flight-tests indicate, that this avoids congestion and can frequently avoid the complete loss of video pictures which happens without adaptation.
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[597] | Claudiu Cobarzan, Marco Andrea Hudelist, Klaus Schoeffmann, Manfred Jürgen Primus, Mobile Image Analysis: Android vs. iOS, In Proceedings of the 21st International Conference on MultiMedia Modelling 2015 (MMM 2015) (Xiangjian He, Suhuai Luo, eds.), Springer, Berlin, Heidelberg, New York, pp. 12, 2015.
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[596] | Christian Beecks, Klaus Schoeffmann, Mathias Lux, Merih Seran Uysal, Thomas Seidl, Endoscopic Video Retrieval: A Signature-based Approach for Linking Endoscopic Images with Video Segments, In Proceedings of the IEEE International Symposium on Multimedia 2015 (ISM 2015) (Alberto Del Bimbo, Shu-Ching Chen, Haohong Wang, Heather Yu, Roger Zimmermann, eds.), IEEE, Los Alamitos, CA, pp. 1-6, 2015.
[bib] [abstract]
Abstract: In the field of medical endoscopy more and more surgeons are changing over to record and store videos of their endoscopic procedures, such as surgeries and examinations, in long-term video archives. In order to support surgeons in accessing these endoscopic video archives in a content-based way, we propose a simple yet effective signature-based approach: the Signature Matching Distance based on adaptive-binning feature signatures. The proposed distance-based similarity model facilitates an adaptive representation of the visual properties of endoscopic images and allows for matching these properties efficiently. We conduct an extensive performance analysis with respect to the task of linking specific endoscopic images with video segments and show the high efficacy of our approach. We are able to link more than 88% of the endoscopic images to their corresponding correct video segments, which improves the current state of the art by one order of magnitude.
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[595] | Florian Bacher, Benjamin Rainer, Hermann Hellwagner, Towards Controller-aided Multimedia Dissemination in Named Data Networking, In Proceedings of IEEE International Conference on Multimedia and Expo Workshops (available not, ed.), IEEE, Los Alamitos, CA, USA, pp. 1-6, 2015.
[bib] [doi] [pdf] [abstract]
Abstract: Software Defined Networking (SDN) and Named Data Networking (NDN) are two topics which have received lots of attention in the networking research community in recent years. While both have emerged independently from each other we believe that their core features can be well aligned to each other. Hence combining both may hold potential benefits for network operators. In this paper we investigate the advantage of having a central SDN controller which is aware of the complete topology of an underlying NDN network. In our approach we use the controller for routing Interests for names unknown to the forwarding elements and to find alternative routes in case of link congestion. Another advantage of SDN is the ability to analyze and control the network on an application-layer component which communicates with the controller. This allows the development of application-aware networks that support the specific needs of the applications that use them. As an example use case we assumed a network whose main purpose is to disseminate multimedia content with Zipf-distributed popularity among users. Having an application layer which knows about content popularity statistics we improve the dissemination of multimedia content by instructing dedicated nodes in the network to prefetch content which is expected to become popular in their geographical region or autonomous system (AS) in the near future. The aim of this approach is to reduce the distance to potential consumers and reduce the load of the core network.
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[594] | Christian Timmerer, Carsten Griwodz, Ali Cengiz Begen, Thomas Stockhammer, Bernd Girod, Guest Editorial: Adaptive Media Streaming, In IEEE Journal on Selected Areas in Communications, IEEE Communications Society, vol. 32, no. 4, New York, NY, USA, pp. 681-683, 2014.
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[593] | Christian Timmerer, Benjamin Rainer, The Social Multimedia Experience, In IEEE Computer, IEEE Computer Society, vol. 47, no. 3, Los Alamitos, CA, USA, pp. 67-69, 2014.
[bib] [pdf] [abstract]
Abstract: Inter-destination multimedia synchronization and quality of experience are critical to the success of social TV, which integrates television viewing with social networking.
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[592] | Mathias Lux, Desara Xhura, Alexander Kopper, User Intentions in Digital Photo Production: A Test Data Set, In MultiMedia Modeling (C Currin, F Hopfgartner, W Hurst, H Johansen, H Lee, N O’Connor, eds.), Springer International Publishing, Heidelberg, New York, pp. 172-182, 2014.
[bib] [abstract]
Abstract: Taking a photo with a digital camera or camera phone is a process triggered by a certain motivation. People want for instance to document the progress of a task, others want to preserve a moment of joy. In this contribution we present an openly available dataset with 1,309 photos along with annotations specifying the intentions of the photographers. This data set is the result of a large survey on Flickr and shall provide a common basis for joint research on user intentions in photo production. The survey data was validated using Amazon Mechanical Turk. Besides discussing the process of creating the data set we also present information of the structure and give statistics on the data set.
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[591] | Mathias Lux, Glenn Macstravic, The LIRE Request Handler: A Solr Plug-In for Large Scale Content Based Image Retrieval, Chapter in MultiMedia Modeling (C Gurrin, F Hopfgartner, W Hurst, H Johansen, H Lee, N O’Connor, eds.), Springer, Heidelberg, New York, pp. 374-377, 2014.
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[590] | M Zaharieva, M Riegler, M Del Fabro, Multimodal Synchronization of Image Galleries, In Working Notes Proceedings of the MediaEval 2014 Workshop (F De Natale, V Mezaris, N Conci, eds.), CEUR-WS, Vol-1263, pp. 1-2, 2014.
[bib] |
[589] | M Zaharieva, M Schopfhauser, M Del Fabro, M Zeppelzauer, Clustering and Retrieval of Social Events in Flickr, In Working Notes Proceedings of the MediaEval 2014 Workshop (G Petkos, S Papadopoulos, G Rizzo, V Mezaris, R Troncy, eds.), CEUR-WS, Vol-1263, pp. 1-2, 2014.
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[588] | Xiaoxiao Luo, Qing Xu, Mateu Sbert, Klaus Schoeffmann, Video Navigation on Tablets with Multi-Touch Gestures, In Multimedia and Expo (ICME), 2014 IEEE International Conference on (Touradj Ebrahimi, Shipeng Li, Houjun Wang, Jie Yang, eds.), IEEE, Los Alamitos, CA, USA, pp. 6, 2014.
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[587] | Christian Timmerer, Ali Cengiz Begen, Over the Top Content Delivery: State of the Art and Challenges Ahead, In Proceedings of the 2014 ACM Multimedia Conference (Kien Hua, Yong Rui, Ralf Steinmetz, Alan Hanjalic, Apostol Natsev, Wenwu Zhu, eds.), ACM, New York, NY, USA, pp. 1231-1232, 2014.
[bib] [doi] [pdf] [slides] [abstract]
Abstract: In this tutorial we present state of the art and challenges ahead in over-the-top content delivery. It particular, the goal of this tutorial is to provide an overview of adaptive media delivery, specifically in the context of HTTP adaptive streaming (HAS) including the recently ratified MPEG-DASH standard. The main focus of the tutorial will be on the common problems in HAS deployments such as client design, QoE optimization, multi-screen and hybrid delivery scenarios, and synchronization issues. For each problem, we will examine proposed solutions along with their pros and cons. In the last part of the tutorial, we will look into the open issues and review the work-in-progress and future research directions.
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[586] | Christian Timmerer, Markus Waltl, Benjamin Rainer, Niall Murray, Sensory Experience: Quality of Experience Beyond Audio-Visual, Chapter in Quality of Experience: Advanced Concepts, Applications and Methods (Sebastian Möller, Alexander Raake, eds.), Springer, Heidelberg, pp. 351-365, 2014.
[bib] [abstract]
Abstract: This chapter introduces the concept of Sensory Experience which aims to define the Quality of Experience (QoE) going beyond audio-visual content. In particular, we show how to utilize sensory effects such as ambient light, scent, wind, or vibration as additional dimensions contributing to the quality of the user experience. Therefore, we utilize a standardized representation format for sensory effects that are attached to traditional multimedia resources such as audio, video, and image contents. Sensory effects are rendered on special devices (e.g., fans, lights, motion chair, scent emitter) in synchronization with the traditional multimedia resources and shall stimulate also other senses than hearing and seeing with the intention to increase the Quality of Experience (QoE), in this context referred to as Sensory Experience.
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[585] | Christian Timmerer, MPEG Column: 107th MPEG Meeting, In ACM SIGMultimedia Records, ACM, vol. 6, no. 1, New York, NY, USA, pp. 1-2, 2014.
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[584] | Christian Timmerer, Markus Waltl, Benjamin Rainer, Stefan Lederer, Hermann Hellwagner, Enhancing 3D Video to enable a Fully Immersive Sensory Experiences, In IEEE Multimedia Communications Technical Committee E-Letter, IEEE Communications Society [online], vol. 9, no. 1, New York, NY, USA, pp. 23-26, 2014.
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[583] | Christian Timmerer, Christopher Mueller, Stefan Lederer, Adaptive Media Streaming over Emerging Protocols, In 2014 NAB Broadcast Engineering Conference Proceedings & CD (not available, ed.), National Association of Broadcasters (NAB), Washington DC, USA, pp. 4, 2014.
[bib] [pdf] [slides] [abstract]
Abstract: The emerging MPEG standard Dynamic Adaptive Streaming over HTTP (MPEG-DASH) is designed for media delivery over the top of existing infrastructures and enables smooth multimedia streaming towards heterogeneous devices including both wired and wireless environments. The MPEG-DASH standard was designed to work with HTTP-URLs but mandates neither the actual version nor which underlying protocols to be used. This paper will provide a detailed introduction into emerging protocols (HTTP/2.0 and beyond) to be used in the context of adaptive media streaming, specifically DASH.
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[582] | Mario Taschwer, Medical Case Retrieval, In Proceedings of the ACM International Conference on Multimedia (n/a n/a, ed.), ACM, New York, NY, USA, pp. 639-642, 2014.
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[581] | Mario Taschwer, Textual Methods for Medical Case Retrieval, Technical report, Institute of Information Technology (ITEC), Alpen-Adria-Universität, no. TR/ITEC/14/2.01, Klagenfurt, Austria, pp. 50, 2014.
[bib] [pdf] [abstract]
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.
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[580] | Klaus Schoeffmann, David Ahlstrom, Marco Andrea Hudelist, 3-D Interfaces to Improve the Performance of Visual Known-Item Search, In Multimedia, IEEE Transactions on, IEEE, vol. 16, no. 7, Los Alamitos, CA, USA, pp. 10, 2014.
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[579] | Klaus Schoeffmann, Manfred Del Fabro, Tibor Szkaliczki, Laszlo Böszörmenyi, Jörg Keckstein, Keyframe extraction in endoscopic video, In Multimedia Tools and Applications, Springer US, New York, pp. 1-20, 2014.
[bib][url] [doi] |
[578] | Klaus Schoeffmann, The Stack-of-Rings Interface for Large-Scale Image Browsing on Mobile Touch Devices, In Proceedings of the ACM International Conference on Multimedia 2014 (ACM MM 2014) (Kien Hua, Yong Rui, Ralf Steinmetz, eds.), ACM, New York, NY, USA, pp. 1097-1100, 2014.
[bib] |