[31] | Michael Mackay, David Hutchison, Michael Ransburg, Hermann Hellwagner, Combined Adaptation and Caching of MPEG-4 SVC in Streaming Scenarios, In 2008 Ninth International Workshop on Image Analysis for Multimedia Interactive Services (Hermann Hellwagner, Christian Timmerer, eds.), IEEE, Los Alamitos, CA, USA, pp. 101-104, 2008.
[bib][url] [pdf] [abstract]
Abstract: A key objective of the ENTHRONE II Project is the ability to optimise the delivery of multimedia content to a wide group of heterogeneous users. One example of this is in the cooperative deployment of adaptation and caching functionality in the edge network. This hybrid approach makes it possible not only to store content locally, thus minimising the cost incurred through subsequent requests, but also to better serve heterogeneous groups of users by dynamically adapting the content to suit a wide range of terminal devices. In this paper, we describe and evaluate how the cooperative deployment of MPEG-21-based adaptation and caching of MPEG-4 SVC can result in improvements both in the quality of the content received at the user terminal and the resources consumed during the delivery
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[30] | Mathias Lux, Gisela Granitzer, Günter Beham, User-Centered Multimedia Retrieval Evaluation based on Empirical Research, In Multimedia Semantics. The Role of Metadata (Mathias Lux, Marc Spaniol, eds.), Springer, Berlin, Heidelberg, New York, pp. 175-194, 2008.
[bib][url] |
[29] | Mathias Lux, Oge Marques, Arthur Pitman, Using Visual Features to Improve Tag Suggesions in Image Sharing Sites, In Proceedings of the I-KNOW´08 and I-MEDIA´08 (Klaus Tochtermann, Hermann Maurer, eds.), TU Graz & Know Center, Graz, Austria, pp. 425-429, 2008.
[bib][url] |
[28] | Mathias Lux, Revisiting the Vector Retrieval Model in Context of the MPEG-7 Semantic Description Scheme, In 2008 Ninth International Workshop on Image Analysis for Multimedia Interactive Services (Hermann Hellwagner, Christian Timmerer, eds.), IEEE, Los Alamitos, CA, USA, pp. 134-138, 2008.
[bib][url] |
[27] | Mathias Lux, Christian Russ, A Model of Self-Organized Criticality in Emergent Web Systems, In Information Systems and e-Business Technologies, 2nd International United Information Systems Conference (Roland Kaschek, Christian Kop, Claudia Steinberger, Günther Fliedl, eds.), Springer, Berlin, Heidelberg, New York, pp. 496-507, 2008.
[bib][url] [abstract]
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.
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[26] | Mathias Lux, ed., Semantische Metadaten. Ein Modell für den Bereich zwischen Metadaten und Ontologien, Verlag Dr. Müller, Saarbrücken, Germany, pp. 152, 2008.
[bib][url] [abstract]
Abstract: Für Rechner nachvollziehbare semantische Information kann mithilfe von Konzepten und Abhängigkeiten zwischen den Konzepten modelliert werden. Auf diese Art kann semantische Information als Graph dargestellt werden, wie es zum Beispiel beim Multimedia Metadaten Standard MPEG-7 der Fall ist. In dieser Arbeit wird das Modell der semantischen Metadaten vorgestellt, das die Einfachheit und den Nutzen von klassischen Metadaten mit der Ausdrucksstärke von Ontologien kombiniert. Mithilfe dieses Modells wird auf Basis von graphentheoretischen Methoden die Suche in semantischen Informationen ermöglicht. Metriken und Modelle für das Retrieval werden eingeführt und anschließend hinsichtlich ihrer Semantik gegenüber dem Benutzerempfinden evaluiert. Zusätzlich wird für die praktische Anwendung der Ergebnisse eine beispielhafte Architektur einer Suchmaschine für semantische Informationen vorgestellt.
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[25] | Fernando López, Dietmar Jannach, José M Martínez, Christian Timmerer, Hermann Hellwagner, Narciso García, Multimedia Adaptation Decisions Modelled as Non-deterministic Operations, In 2008 Ninth International Workshop on Image Analysis for Multimedia Interactive Services (Hermann Hellwagner, Christian Timmerer, eds.), IEEE, Los Alamitos, CA, USA, pp. 46-49, 2008.
[bib][url] [pdf] [abstract]
Abstract: This paper describes how a multimedia adaptation framework can automatically decide the sequence of operations to be executed in order to adapt an MPEG-21 Digital Item to the MPEG-21 description of the usage environment in which it will be consumed. The main innovation of this work with respect to previous multimedia adaptation decision models is that in the proposed approach decisions can be made without knowing the exact behaviour of the operations that are going to be executed.
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[24] | Janine Lachner, Hermann Hellwagner, Information and Communication Systems for Mobile Emergency Response, In Information Systems and e-Business Technologies (Proc. 2nd International United Information Systems Conference, UNISCON 2008 (Roland Kaschek, Christian Kop, Claudia Steinberger, Günther Fliedl, eds.), Springer, Berlin, Heidelberg, New York, pp. 213-224, 2008.
[bib] [pdf] [abstract]
Abstract: This discussion paper attempts to propose emergency response and disaster management as worthwhile areas of applied research for the informa-tion system community. The typical requirements, entities and activities in-volved in specifically mobile emergency response operations are summarized. Recent research contributions in this area are exemplarily reviewed in order to give a deeper insight into the role and use of mobile information and communi-cation systems. Finally, the major challenges and research needs regarding in-formation systems are summarized, with a view to draw the attention of infor-mation systems researchers to this interesting and important field.
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[23] | Robert Kuschnig, Ingo Kofler, Michael Ransburg, Hermann Hellwagner, Design options and comparison of in-network H.264/SVC adaptation, In Journal of Visual Communication and Image Representation, Elsevier B.V., vol. 19, no. 8, Amsterdam, pp. 529-542, 2008.
[bib] [doi] [pdf] [abstract]
Abstract: This paper explores design options and evaluates implementations of in-network, RTP/RTSP based adaptation MANEs (Media Aware Network Elements) for H.264/SVC content streaming. The obvious technique to be employed by such an adaptation MANE is to perform SVC specific bitstream extraction or truncation. Another mechanism that can be used is description (metadata) driven, coding format independent adaptation based on generic Bitstream Syntax Descriptions (gBSD), as specified within MPEG-21 Digital Item Adaptation (DIA). Adaptation MANE architectures for both approaches are developed and presented, implemented in end-to-end streaming/adaptation prototype systems, and experimentally evaluated and compared. For the gBSD based solution, open issues like the granularity of bitstream descriptions and of bitstream adaptation, metadata overhead, metadata packetization and transport options, and error resilience in case of metadata losses, are addressed. The experimental results indicate that a simple SVC specific adaptation MANE does clearly outperform the gBSD based adaptation variants. Yet, the conceptual advantages of the description driven approach, like coding format independence and flexibility, may outweigh the performance drawbacks in specific applications.
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[22] | Harald Kosch, Laszlo Böszörmenyi, Günther Hölbling, Danail Coquil, Jörg Heuer, eds., Personalization of Mobile Multimedia Broadcasting, Hindawi, New York, USA & Cairo, Egypt, pp. 6, 2008.
[bib] |
[21] | Ingo Kofler, Christian Timmerer, Hermann Hellwagner, Optimization-based Multimedia Adaptation Decision-Taking, Chapter in Encyclopedia of Multimedia (Borko Furht, ed.), Springer, New York, USA, pp. 699-704, 2008.
[bib] [doi] [pdf] |
[20] | Ingo Kofler, Joachim Seidl, Christian Timmerer, Hermann Hellwagner, Toufik Ahmed, Using MPEG-21 for Cross-layer Multimedia Content Adaptation, In Journal on Signal, Image and Video Processing, Springer, vol. 2, no. 4, London, United Kingdom, pp. 355-370, 2008.
[bib] [doi] [pdf] [abstract]
Abstract: This paper presents a cross-layer model—formulated using interoperable description formats—for the adaptation of scalable H.264/MPEG-4 AVC (i.e., SVC) content in a video streaming system operating on aWireless LANaccess network without QoS mechanisms.SVCcontent adaptation on the server takes place on the application layer using an adaptation process compliant with the MPEG-21 Digital Item Adaptation (DIA) standard, based on input comprised of MPEG-21 DIA descriptions of content and usage environment parameters. The latter descriptions integrate information from different layers, e.g., device characteristics and packet loss rate, in an attempt to increase the interoperability of this cross-layer model, thus making it applicable to other models. For the sake of deriving model parameters, performance measurements from two wireless access point models were taken in account. Throughout the investigation it emerged that the behavior of the system strongly depends on the access point. Therefore, we investigated the use of end-to-end-based rate control algorithms for steering the content adaptation. Simulations of rate adaptation algorithms were subsequently performed, leading to the conclusion that a TFRC-based adaptation technique (TCP-Friendly Rate Control) performs quite well in adapting to limited bandwidth and varying network conditions. In the paper we demonstrate howTFRC-based content adaptation can be realized using MPEG-21 tools.
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[19] | Ingo Kofler, Martin Prangl, Robert Kuschnig, Hermann Hellwagner, An H.264/SVC-based Adaptation Proxy on a WiFi Router, In Proceedings of the 18th International Workshop on Network and Operating Systems Support for Digital Audio and Video (NOSSDAV) (Lars Wolf, Carsten Griwodz, eds.), ACM, New York, NY, USA, pp. 63-68, 2008.
[bib] [doi] [pdf] [abstract]
Abstract: Recent advances in video coding technology like the scalable extension of the MPEG-4 AVC/H.264 video coding standard pave the way for computationally cheap adaptation of video content. In this paper we present our work on a lightweight RTSP/RTP proxy that enables in-network stream processing. Based on an off-the-shelf wireless router that runs a Linux-based firmware we demonstrate that the video adaptation can be performed on-the-fly directly on a network device. The paper covers design and implementation details of the proxy as well as a discussion about the actual adaptation of the SVC stream. Based on experimental evaluations we show that our approach can handle a reasonable number of concurrent sessions for a typical home deployment scenario. Furthermore, the paper covers possible applications in which adaptation on the network device can be beneficial.
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[18] | Julius Köpke, Roland Tusch, Hermann Hellwagner, Laszlo Böszörmenyi, Context-aware hoarding of Multimedia Content in a large-scale Tour Guide Scenario, In Proceedings of the International Conference on Signal Processing and Multimedia Applications (Pedro Assunção, Sérgio Faria, eds.), INSTICC Press, Setubal, pp. 15-23, 2008.
[bib][url] |
[17] | Peter Karpati, Tibor Szkaliczki, Laszlo Böszörmenyi, Modeling and Simulation of the Performance of Distributed Video Services, In 13th International Telecommunications Network Strategy and Planning Symposium (G Sallai, ed.), IEEE, Los Alamitos, CA, USA, pp. 10, 2008.
[bib][url] |
[16] | Peter Karpati, Tibor Szkaliczki, Laszlo Böszörmenyi, Comparing Static and Self-Organizing Behaviours for VoD Servers, In Internet and Multimedia Systems and Applications 2008 (M Mandal, ed.), ACTA Press, Calgary, Canada, pp. 44-49, 2008.
[bib][url] |
[15] | Dietmar Jannach, Christian Timmerer, Hermann Hellwagner, Knowledge-based Multimedia Adaptation Decision-Taking, Chapter in Encyclopedia of Multimedia (Borko Furht, ed.), Springer, Berlin, Heidelberg, New York, pp. 391-394, 2008.
[bib] [pdf] |
[14] | Hermann Hellwagner, Challenges toward Adaptive Behavior of Distributed Multimedia Systems, In Advances in Multiagent Systems, Robotics and Cybernetics: Theory and Practice (Volume II) (George E Lasker, Jochen Pfalzgraf, eds.), The International Institute for Advanced Studies in Systems Research and Cybernetics, Tecumseh, pp. 15-19, 2008.
[bib] [pdf] [abstract]
Abstract: The multimedia community is pursuing, among others, the vision of Universal Multimedia Access (UMA). UMA denotes the concept that any multimedia content should be available anywhere, anytime, on any device, tailored to the user's needs and preferences, accessible for the user in a transparent and convenient way. Key to achieving this vision is to realize collaborative adaptive behavior of the involved distributed multi-media system components (server, media-aware net-work elements like proxies or gateways, and clients), based on intense metadata exchange and multimedia content negotiation, adaptation, or personalization. This paper outlines the key challenges and the state of the art in achieving such adaptive behavior. The major challenges have been tackled recently and many of the building blocks of UMA have become or are becoming available from standardization groups, which are instrumental in this area to ensure interop-erable use of the media and metadata items. However, making use of these standards in practical multimedia systems raises additional issues, both of conceptual nature and in terms of implementation. Based on years of contributions to ISO/IEC MPEG standardization efforts and of research work into adaptive multimedia systems, we will give an overview of these challenges, discuss the state of the art, and introduce an emerging principled solution for format-independent multimedia content adaptation.
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[13] | Michael Granitzer, Mathias Lux, Marc Spaniol, eds., Multimedia Semantics - The Role of Metadata, Springer, Berlin, Heidelberg, New York, pp. 261, 2008.
[bib][url] [abstract]
Abstract: The multimedia metadata community (www.multimedia-metadata.info), wherefrom this book originated, brings together experts from research and industry in the area of multimedia metadata research and application development. The community bridges the gap between an academic research and an industrial scale development of innovative products. By summarizing the work of the community this book contributes to the aforementioned fields by addressing these topics for a broad range of readers.
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[12] | Andrew Gordon, Catherine Havasi, Mathias Lux, Markus Strohmaier, eds., Proceedings of the Workshop on Common Sense Knowledge and Goal-Oriented Interfaces, http://ceur-ws.org/Vol-323/, Aachen, Germany, pp. online, 2008.
[bib][url] |
[11] | Andrew Gordon, Catherine Havasi, Mathias Lux, Markus Strohmaier, eds., Workshop on Common Sense Knowledge and Goal-Oriented Interfaces, Klagenfurt University, Klagenfurt, Austria, pp. nA, 2008.
[bib] |
[10] | Michael Eberhard, Luca Celetto, Christian Timmerer, Emanuele Quacchio, Hermann Hellwagner, An Interoperable Streaming Framework for Scalable Video Coding based on MPEG-21, In STreaming Day'08 Proceedings (Luca Fanucci, Fabrizio Rovati, Christian Timmerer, eds.), University of Parma, Parma, pp. 4, 2008.
[bib] [pdf] [abstract]
Abstract: In this paper, an interoperable streaming framework for the adaptation and streaming of scalable multimedia content is presented. The streaming framework’s architecture for Video on Demand (VoD) as well as multicast streaming is presented. The VoD test-bed allows each client to set up a separate streaming session and receive the bitstreams in a quality tailored to the clients requirements, while the multicast test-bed provides a layered scalable multicast to all clients and every client needs to decide which layers to subscribe to. After the description of the architectures, a comparison in terms of performance of the MPEG-21 DIA metadata-based adaptation approach to an SVC-specific adaptation approach is presented. Furthermore, optimizations for both adaptation approaches are presented and the performance improvements due to the optimizations are discussed.
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[9] | Michael Eberhard, Luca Celetto, Christian Timmerer, Emanuele Quacchio, Hermann Hellwagner, Fabrizio S Rovati, An Interoperable Streaming Framework for Scalable Video Coding based on MPEG-21, In Proceedings of the 5th IET Visual Information Engineering Conference Conference (VIE’08) (Ebroul Izquierdo, Guizhong Liu, eds.), IET, London, pp. 723-728, 2008.
[bib] [pdf] [abstract]
Abstract: This paper presents an interoperable framework for the streaming of scalable multimedia content such as Scalable Video Coding (SVC). In particular, the framework’s architecture for both, Video on Demand (VoD) and multicast streaming, is presented. The architecture includes a detailed description of the adaptation engine – conforming to MPEG-21 Digital Item Adaptation – as well as the integration of the adaptation engine into VideoLAN’s VLC media player, which provides the streaming server and client for the framework. Following the description of the architecture, a comparison in terms of performance of the generic MPEG-21 DIA-based adaptation approach, which is utilized by the described demo, versus an SVC-specific adaptation approach is presented and possible further improvements for both approaches are investigated.
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[8] | Michael Eberhard, Luca Celetto, Christian Timmerer, Emanuele Quacchio, Hermann Hellwagner, Fabrizio S Rovati, An Interoperable Multimedia Delivery Framework for Scalable Video Coding based on MPEG-21 Digital Item Adaptation, In Proceedings of the IEEE International Conference on Multimedia and Expo 2008 (ICME’08) (Jörn Ostermann, Touradj Ebrahimi, eds.), IEEE, Los Alamitos, CA, USA, pp. 1607-1608, 2008.
[bib] [pdf] [abstract]
Abstract: In this paper we present an interoperable multimedia delivery framework for scalable video coding based on MPEG-21 Digital Item Adaptation (DIA). In can be used to transmit scalable video contents within heterogeneous usage environments where the properties of the usage environment (e.g., terminal/network capabilities) may change dynamically during the streaming session. The usage environment is signaled by interoperable description formats provided by the DIA standard. Additionally, the adaptation itself is done by exploiting the standard's generic adaptation approach, i.e., independent of the actual coding format. Thus, the overall framework is also applicable for other scalable coding formats.
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[7] | Michael Eberhard, Luca Celetto, Christian Timmerer, Emanuele Quacchio, Hermann Hellwagner, Performance Analysis of Scalable Video Adaptation: Generic versus Specific Approach, In 2008 Ninth International Workshop on Image Analysis for Multimedia Interactive Services (Hermann Hellwagner, Christian Timmerer, eds.), IEEE, Los Alamitos, CA, USA, pp. 43-50, 2008.
[bib] [pdf] [abstract]
Abstract: This paper provides a performance analysis of adaptation approaches designed for scalable media resources. In particular, we investigate the streaming of media resources compliant to the Scalable Video Coding (SVC) extensions of Advanced Video Coding (AVC)within heterogeneous environments, i.e., terminals and networks with different capabilities. Therefore, we have developed a test-bed in order to analyze two different approaches for the adaptation of scalable media resources, namely a generic approach that is applicable independently of the actual scalable coding format used and a specific approach especially built for SVC.The results show that if adaptation is required the generic approach clearly outperforms the approach specifically built for SVC
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