% Categories: ENTHRONE % Encoding: utf-8 @InProceedings{Timmerer2010_INTL-DPIF, author = {Timmerer, Christian and Hellwagner, Hermann}, booktitle = {Proceedings of the 1st International Digital Preservation Interoperability Framework Symposium}, title = {MPEG-21 digital items in research and practice}, year = {2010}, address = {New York, NY, USA}, editor = {Chang, Wo}, month = {apr}, pages = {8:1-8:8}, publisher = {ACM}, series = {INTL-DPIF}, abstract = {The aim of the MPEG‐21 standard, the so‐called Multimedia Framework, is to enable transparent and augmented use of multimedia resources across a wide range of networks, devices, user preferences, and communities, notably for trading (of bits). As such, it provides an important step in MPEG's standards evolution, i.e., the transaction of Digital Items among Users. This paper provides an overview of applications making use specifically of MPEG‐21 Digital Items and a more in‐depth presentation of a few selected applications in research and practice.}, doi = {10.1145/2039263.2039271}, keywords = {DANAE, ENTHRONE, MPEG-21, P2P-Next, UPnP, application, digital item, digital library, usage}, language = {EN}, location = {Dresden, Germany}, pdf = {https://www.itec.aau.at/bib/files/a8-timmerer.pdf}, slides = {https://www.itec.aau.at/bib/files/DPIF2010_v1.0.pdf}, talkdate = {2010.04.22}, talktype = {registered} } @InCollection{Zahariadis2009, author = {Zahariadis, Theodore and Lamy-Bergot, Catherine and Schierl, Thomas and Grüneberg, Karsten and Celetto, Luca and Timmerer, Christian}, booktitle = {Towards the Future Internet - A European Research Perspective}, publisher = {IOS Press}, title = {Content Adaptation Issues in the Future Internet}, year = {2009}, address = {Amsterdam, Netherlands}, editor = {Tselentis, Georgios and Domingue, John and Galis, Alex and Gavras, Anastasius and Hausheer, David and Krco, Srdjan and Lotz, Volkmar and Zahariadis, Theodore}, month = may, pages = {283-292}, abstract = {Future Media Internet is envisaged to provide the means to share and distribute (advanced) multimedia content and services with superior quality and striking flexibility, in a trusted and personalized way, improving citizens' quality of life, working conditions, edutainment and safety. Based on work that has taken place in projects ICT SEA and ICT OPTIMIX, and the Media Delivery Platforms Cluster of projects, we try to provide the challenges and the way ahead in the area of content adaptation.}, issn = {9781607500070}, keywords = {Future Media Internet, Adaptation, Scalable Video Coding}, language = {EN}, pdf = {https://www.itec.aau.at/bib/files/STAL9781607500070-0283.pdf}, url = {http://www.booksonline.iospress.nl/Content/View.aspx?piid=12006} } @InProceedings{Kofler2009, author = {Kofler, Ingo and Kuschnig, Robert and Hellwagner, Hermann}, booktitle = {Proceedings of the 6th IEEE Consumer Communications and Networking Conference (CCNC)}, title = {In-Network Real-Time Adaptation of Scalable Video Content on a WiFi-ne Router}, year = {2009}, address = {Los Alamitos, CA, USA}, editor = {Gibbs, Simon and Messer, Alan}, month = jan, pages = {2}, publisher = {IEEE}, series = {CCNC}, abstract = {One of the most active research topics in the field of video signal processing is scalable video coding (SVC). The recently published extension of the H.264/AVC video coding standard introduces scalability features by employing a layered encoding of the video stream. In our work we investigated the usage of this scalable extension of H.264/AVC for in-network multimedia adaptation. We developed an RTSP/RTP-based proxy which exploits the layered encoding of the video and can perform real-time video adaptation on an inexpensive off-the-shelf WiFi router. This is achieved by applying a stateful, packet-based adaptation approach that keeps the computational costs at a minimum. With that approach it is possible to simultaneously adapt multiple video streams to varying network conditions or to the capabilities of the consumers' end-devices. In our demonstration we show the streaming of two scalable video streams from a server to a client and the in-network adaptation of the video at the WiFi router. The adaptation can be controlled interactively in the temporal, spatial and SNR domains.}, doi = {10.1109/CCNC.2009.4785005}, isbn13 = {9781424423088}, language = {EN}, location = {Las Vegas, NV, USA}, pdf = {https://www.itec.aau.at/bib/files/CCNC09_SVC_Adaptation_Router_preprint.pdf}, talkdate = {2009.01.11}, talktype = {poster} } @InProceedings{Timmerer2008h, author = {Timmerer, Christian and Ransburg, Michael and Kofler, Ingo and Hellwagner, Hermann and Souto, Pedro and Andrade, Maria and Carvalho, Pedro and Castro, Helder and Sidibe, Mamadou and Mehaoua, Ahmed and Fang, Li and Lindsay, Adam and Mackay, Michael and Lugmayr, Artur and Feiten, Bernhard}, booktitle = {Proceedings of the 2nd European Symposium on Mobile Media Delivery (EUMOB)}, title = {An Integrated Management Supervisor for End-to-End Management of Heterogeneous Contents, Networks, and Terminals enabling Quality of Service}, year = {2008}, address = {New York, NY, USA}, editor = {Frantti, Tapio and Huusko, Jyrki}, month = jul, pages = {6}, publisher = {ACM}, series = {EUMOB}, abstract = {End-to-end support for Quality of Service (QoS) has been broadly discussed in the literature. Many technologies have been proposed, each focusing on specific aspects for providing QoS guarantees to the end user. However, the integrated management of the end-to-end chain preserving QoS in heterogeneous environments is still a significant issue and insufficiently addressed to date. In this paper we propose an integrated management supervisor that takes into account the requirements from all stakeholders along the multimedia content delivery chain and provides an end-to-end management solution enabling QoS to the end user. This architecture and the subsystems that can be distributed along the end-to-end chain are detailed in this paper.}, language = {EN}, pdf = {https://www.itec.aau.at/bib/files/eumob2008enthrone.pdf}, talktype = {none} } @InProceedings{Timmerer2008f, author = {Timmerer, Christian and Andrade, Maria Teresa and Carvalho, Pedro and Rogai, Davide and Cordara, Giovanni}, booktitle = {Proceedings of ACM Multimedia 2008 2nd International Workshop on the Many Faces of Multimedia Semantics}, title = {The Semantics of MPEG-21 Digital Items Revisited}, year = {2008}, address = {New York, USA}, editor = {Fotouhi, Farshad and Grosky, William I and Stanchev, Peter}, month = oct, pages = {17-23}, publisher = {ACM}, abstract = {The MPEG-21 standard forms a comprehensive multimedia framework covering the entire multimedia distribution chain. In particular, it provides a flexible approach to represent, process, and transact complex multimedia objects which are referred to as Digital Items (DIs). DIs can be quite generic, independent of the application domain, and can encompass a diversity of media resources and metadata. This flexibility has an impact on the level of interoperability between systems and applications, since not all the functionality needs to be implemented. Furthermore, additional semantic rules may be implemented through the processing of the Digital Item which is possibly driven by proprietary metadata. This jeopardizes interoperability and consequently raises barriers to the successful achievement of augmented and transparent use of multimedia resources. In this context, we have investigated and evaluated the interoperability at the semantic level of Digital Items throughout the automated production, delivery and consumption of complex multimedia resources in heterogeneous environments. This paper describes the studies conducted, the experiments performed, and the conclusions reached towards that goal.}, doi = {http://dx.doi.org/10.1145/1460676.1460681}, isbn13 = {978-1-60558-316-7}, keywords = {MPEG-21, Digital Items, Semantics, Evaluation, Metadata.}, language = {EN}, pdf = {https://www.itec.aau.at/bib/files/ms41754-timmerer-pre.pdf}, talktype = {none} } @InCollection{Timmerer2008e, author = {Timmerer, Christian and Hellwagner, Hermann}, booktitle = {Encyclopedia of Multimedia}, publisher = {Springer}, title = {MPEG-21 Multimedia Framework}, year = {2008}, address = {Berlin, Heidelberg, New York}, edition = {2}, editor = {Furht, Borko}, month = oct, pages = {463-469}, isbn10 = {0387747249}, isbn13 = {978-0387747248}, language = {EN}, pdf = {https://www.itec.aau.at/bib/files/Encyclopedia_MM_M21_pre.pdf} } @InCollection{Timmerer2008d, author = {Timmerer, Christian and Vetro, Anthony and Hellwagner, Hermann}, booktitle = {Encyclopedia of Multimedia}, publisher = {Springer}, title = {MPEG-21 Digital Item Adaptation}, year = {2008}, address = {Berlin, Heidelberg, New York}, edition = {2}, editor = {Furht, Borko}, month = oct, pages = {457-463}, isbn10 = {0387747249}, isbn13 = {978-0387747248}, language = {EN}, pdf = {https://www.itec.aau.at/bib/files/Encyclopedia_MM_M21_DIA_pre.pdf} } @InCollection{Timmerer2008c, author = {Timmerer, Christian}, booktitle = {Encyclopedia of Multimedia}, publisher = {Springer}, title = {Multimedia Adaptation Decision-Taking}, year = {2008}, address = {Berlin, Heidelberg, New York}, editor = {Furht, Borko}, month = oct, pages = {485-487}, abstract = {Multimedia adaptation decision-taking is referred to as the process of finding the optimal parameter settings for (multiple, possibly in series connected) multimedia content adaptation engines given the properties, characteristics, and capabilities of the content and the context in which it will be processed.}, language = {EN}, pdf = {https://www.itec.aau.at/bib/files/Encyclopedia_MM_ADT_pre.pdf} } @InCollection{Timmerer2008b, author = {Timmerer, Christian and Ransburg, Michael and Hellwagner, Hermann}, booktitle = {Encyclopedia of Multimedia}, publisher = {Springer}, title = {Generic Multimedia Content Adaptation}, year = {2008}, address = {Berlin, Heidelberg, New York}, edition = {2}, editor = {Furht, Borko}, month = oct, pages = {263-271}, isbn10 = {0387747249}, isbn13 = {978-0387747248}, language = {EN}, pdf = {https://www.itec.aau.at/bib/files/Encyclopedia_MM_gBSD_pre.pdf} } @Article{Sidibe2008, author = {Sidibe, Mamadou and Koumaras, Harilaos and Kofler, Ingo and Mehaoua, Ahmed and Kourtis, Anastasios and Timmerer, Christian}, journal = {Journal on Signal, Image and Video Processing}, title = {A novel monitoring architecture for media services adaptation based on network QoS to perceived QoS mapping}, year = {2008}, month = dec, number = {4}, pages = {307-320}, volume = {2}, abstract = {One of the future visions of multimedia networking is the provision of multimedia content at a variety of quality and price levels. Of the many approaches to this issue, one of the most predominant techniques is the concept of Perceived Quality of Service (PQoS), which extends the traditional engineering-based QoS concept to the perceptual satisfaction that the user receives from the reception of multimedia content. In this context, PQoS monitoring is becoming crucial to media service providers (SPs) for providing not only quantified PQoS-based services, but also service assurance based on multimedia content adaptation across heterogeneous networks. This work proposes a novel cross-layer monitoring architecture that utilizes a new Network QoS (NQoS) to PQoS mapping framework at the application level. The resulting QoS monitoring should allow the content delivery system to take sophisticated actions for real time media content adaptation, and aims to provide perceived service performance verification with respect to the QoS guarantees that have been specified in contractual agreements between providers and end-users. A subsequent performance evaluation of the proposed model conducted using a real test-bed environment demonstrates both the accuracy and feasibility of the network level measurements, the NQoS to PQoS mapping and the overall feasibility of the proposed end-to-end monitoring solution.}, address = {London, United Kingdom}, doi = {10.1007/s11760-008-0083-2}, language = {EN}, pdf = {https://www.itec.aau.at/bib/files/SIVP08_MonitoringArchitecture_Preprint.pdf}, publisher = {Springer} } @InProceedings{Ransburg2008, author = {Ransburg, Michael and Timmerer, Christian and Hellwagner, Hermann}, booktitle = {Multimedia Semantics: The role of Metadata}, title = {Dynamic and Distributed Multimedia Content Adaptation based on the MPEG-21 Multimedia Framework}, year = {2008}, address = {Berlin, Heidelberg, New York}, editor = {Lux, Mathias and Granitzer, Michael and Spaniol, Marc}, month = feb, pages = {3-24}, publisher = {Springer}, abstract = {Today, there are many technologies in place to establish an infrastructure for the delivery and consumption of multimedia content. In practice, however, several elements of such an infrastructure are often stand-alone systems and a big picture of how these elements relate to each other or even fit together is not available. Therefore, MPEG-21 aims to provide an open framework for interoperable multimedia delivery and consumption. This requirement for interoperability results in a great diversity of XML-based metadata, which describes the media data on semantic or syntactic levels, in order to make it more accessible to the user. This metadata can be of considerable size, which leads to problems in streaming scenarios. Other than media data, XML metadata has no concept of samples, thus inhibiting streamed (and timed) processing, which is natural for media data. In order to address the challenges and requirements resulting from this situation, the concept of streaming instructions is introduced. These streaming instructions facilitate the fragmentation of content-related metadata, the association of media and metadata fragments with each other, and the synchronized streaming and processing of those fragments. Based on these capabilities, a dynamic and distributed multimedia content adaptation framework can be built.}, doi = {10.1007/978-3-540-77473-0_1}, isbn10 = {3540774726}, isbn13 = {978-3540774723}, language = {EN}, talktype = {none} } @InProceedings{Prangl2008a, author = {Prangl, Martin and Kofler, Ingo and Hellwagner, Hermann}, booktitle = {Proceedings of the 4th International Conference on Networking and Services (ICNS)}, title = {Towards QoS Improvements of TCP-based Media Delivery}, year = {2008}, address = {Los Alamitos, CA, USA}, editor = {Bi, Jun and Chin, Kim and Dini, Cosmin and Lehmann, Leo and Pheanis, David C}, month = mar, pages = {188-193}, publisher = {IEEE}, series = {ICNS}, abstract = {The amount of audiovisual data available on the Internet and thus of multimedia communication over today's networks is increasing at a rapid pace. Despite the availability of specific media transport protocols like RTP, most content providers make use of the well-established and reliable TCP protocol to deliver audiovisual content over the Internet. The reason is that TCP-based data delivery in general is much less complicated for the clients to be served and over today's networks traversed (including proxies and firewalls), than making use of UDP-based RTP connections. However, in case of network bandwidth fluctuations and packet losses, TCP-based media delivery may lead to annoying jerky playback at the client side, due to retransmissions and late arrival of media data. This papers deals with TCP-based perceptual QoS improvement mechanisms for increasing the media experience for the consumer under unstable network conditions. Our approach is based on media content adaptation (transcoding) to fit the actual network bandwidth continuously monitored by the sender. The proposed mechanisms are applied at the application level at the server side, leaving the existing TCP implementation untouched and therefore enabling transparent use of existing media players. An evaluation of a realistic use case is presented which underlines the efficency of our approach.}, doi = {10.1109/ICNS.2008.10}, isbn13 = {978-0-7695-3094-9}, language = {EN}, location = {Gosier, Guadaloupe}, pdf = {https://www.itec.aau.at/bib/files/prangl-tQosTcpMediaDelivery.pdf}, talkdate = {2008.03.19}, talktype = {registered} } @InProceedings{Prangl2008, author = {Prangl, Martin and Kofler, Ingo and Hellwagner, Hermann}, booktitle = {Proceedings of the 1st International Conference on Ambient Media and Systems (Ambi-sys)}, title = {An MPEG-21-driven Utility-based Multimedia Adaptation Decision Taking Web Service}, year = {2008}, address = {Brussels, Belgium}, editor = {Whitaker, Roger M and Liang, Ben}, month = feb, pages = {8}, publisher = {ICST}, series = {Ambi-sys}, abstract = {Supporting transparent delivery and convenient use of multimedia content across a wide range of networks and devices is still a challenging task within the multimedia research community; Universal Multimedia Access (UMA) is a vision that has been pursued for quite some time. In multimedia frameworks, content adaptation is the core concept to make progress toward this goal. Most media adaptation engines targeting UMA scale the content w.r.t. terminal capabilities and network resource constraints and do not sufficiently consider end user preferences or even the utility of the adapted content for the user. Based on our previous work and the support of the MPEG-21 framework, we present a transparent solution to provide a content utility-aware adaptation decision for such utility-unaware multimedia frameworks. The idea is to outsource the challenging utility-aware adaptation decision taking task, which takes many factors into consideration and leads to a complex optimization problem. A realistic use case is adopted to show how related external multimedia frameworks can easily integrate and use our proposed adaptation decision taking Web Service.}, isbn13 = {978-963-9799-16-5}, language = {EN}, location = {Quebec, Canada}, pdf = {https://www.itec.aau.at/bib/files/ADTService-final.pdf}, talkdate = {2008.02.12}, talktype = {registered} } @Article{Kuschnig2008, author = {Kuschnig, Robert and Kofler, Ingo and Ransburg, Michael and Hellwagner, Hermann}, journal = {Journal of Visual Communication and Image Representation}, title = {Design options and comparison of in-network H.264/SVC adaptation}, year = {2008}, month = dec, number = {8}, pages = {529-542}, volume = {19}, 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.}, address = {Amsterdam}, doi = {10.1016/j.jvcir.2008.07.004}, keywords = {Scalable video coding (H.264/SVC), In-network adaptation, RTP/RTSP MANE, MPEG-21 Digital Item Adaptation (DIA), Generic Bitstream Syntax Description (gBSD)}, language = {EN}, pdf = {https://www.itec.aau.at/bib/files/JVCIR08_In-network_H.264-AVC_Adaptation.pdf}, publisher = {Elsevier B.V.} } @Article{Kofler2008a, author = {Kofler, Ingo and Seidl, Joachim and Timmerer, Christian and Hellwagner, Hermann and Ahmed, Toufik}, journal = {Journal on Signal, Image and Video Processing}, title = {Using MPEG-21 for Cross-layer Multimedia Content Adaptation}, year = {2008}, month = dec, number = {4}, pages = {355-370}, volume = {2}, 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.}, address = {London, United Kingdom}, doi = {10.1007/s11760-008-0088-x}, keywords = {Multimedia content adaptation · Cross-layer design · MPEG-21 Digital Item Adaptation · Rate control}, language = {EN}, pdf = {https://www.itec.aau.at/bib/files/SIVP08_CrossLayer_Preprint.pdf}, publisher = {Springer} } @InProceedings{Kofler2008, author = {Kofler, Ingo and Prangl, Martin and Kuschnig, Robert and Hellwagner, Hermann}, booktitle = {Proceedings of the 18th International Workshop on Network and Operating Systems Support for Digital Audio and Video (NOSSDAV)}, title = {An H.264/SVC-based Adaptation Proxy on a WiFi Router}, year = {2008}, address = {New York, NY, USA}, editor = {Wolf, Lars and Griwodz, Carsten}, month = may, pages = {63-68}, publisher = {ACM}, series = {NOSSDAV}, 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.}, doi = {10.1145/1496046.1496061}, keywords = {Multimedia adaptation, in-network adaptation, RTSP, RTP, H.264, scalable video coding}, language = {EN}, location = {Braunschweig, Germany}, pdf = {https://www.itec.aau.at/bib/files/NOSSDAV08_AdaptationProxyRouter-preprint.pdf}, talkdate = {2009.05.29}, talktype = {registered} } @InCollection{Jannach2008, author = {Jannach, Dietmar and Timmerer, Christian and Hellwagner, Hermann}, booktitle = {Encyclopedia of Multimedia}, publisher = {Springer}, title = {Knowledge-based Multimedia Adaptation Decision-Taking}, year = {2008}, address = {Berlin, Heidelberg, New York}, edition = {2}, editor = {Furht, Borko}, month = oct, pages = {391-394}, isbn10 = {0387747249}, isbn13 = {978-0387747248}, language = {EN}, pdf = {https://www.itec.aau.at/bib/files/Encyclopedia_MM_AI-ADTE_pre.pdf} } @Book{Mylonas2007, author = {Mylonas, Phivos and Wallace, Manolis and Angelides, Marios C and Hellwagner, Hermann and Agius, Harry}, publisher = {IEEE}, title = {Second International Workshop on Semantic Media Adaptation and Personalization (SMAP 2007)}, year = {2007}, address = {Los Alamitos, CA, USA}, month = dec, isbn10 = {0769530400}, isbn13 = {978-0769530406}, language = {EN}, pages = {269}, url = {http://www.smap2007.org/} } @InProceedings{Kofler2007a, author = {Kofler, Ingo and Timmerer, Christian and Ahmed, Toufik and Hellwagner, Hermann}, booktitle = {Proceedings of the Second International Workshop on Semantic Media Adaptation and Personalization (SMAP)}, title = {Towards MPEG-21-based Cross-layer Multimedia Content Adaptation}, year = {2007}, address = {Los Alamitos, CA, USA}, editor = {Mylonas, Phivos and Wallace, Manolis and Angelides, Marios C}, month = dec, pages = {3-8}, publisher = {IEEE}, series = {SMAP}, abstract = {The adaptation of multimedia resources is a common method to enable the transport and consumption of audio-visual content in constrained environments. An important aspect in this field is adaptation decision-taking, which aims to find adaptation parameters that maximize the quality for the consumer while considering the constraints of the networks and terminals involved. In this paper we focus on improving the adaptation of audio-visual content by maximizing the perceived quality. This can be realized by using a multimedia quality model and content-related metadata. We present an approach to derive this content-related metadata from subjective tests and use it for adaptation decision-taking within the MPEG-21 multimedia framework.}, doi = {10.1109/SMAP.2007.34}, isbn10 = {0769530400}, isbn13 = {978-0769530406}, language = {EN}, location = {London, United Kingdom}, pdf = {https://www.itec.aau.at/bib/files/MPEG-21XL_SMAP2007.pdf}, talkdate = {2009.05.29}, talktype = {registered} } @InProceedings{Kofler2006a, author = {Kofler, Ingo and Hellwagner, Hermann}, booktitle = {Proceedings of the 2nd International Conference on Automated Production of Cross Media Content for Multi-channel Distribution ({AXMEDIS})}, title = {MPEG-21-based Cross-Resource Adaptation Decision-Taking}, year = {2006}, address = {Firenze, Italy}, editor = {Kia, Ng and Badii, Atta and Bellini, Pierfrancesco}, month = dec, pages = {207-214}, publisher = {Firenze University Press}, series = {AXMEDIS}, abstract = {The adaptation of multimedia resources is a common method to enable the transport and consumption of audio-visual content in constrained environments. An important aspect in this field is adaptation decision-taking, which aims to find adaptation parameters that maximize the quality for the consumer while considering the constraints of the networks and terminals involved. In this paper we focus on improving the adaptation of audio-visual content by maximizing the perceived quality. This can be realized by using a multimedia quality model and content-related metadata. We present an approach to derive this content-related metadata from subjective tests and use it for adaptation decision-taking within the MPEG-21 multimedia framework.}, language = {EN}, location = {Leeds, United Kingdom}, pdf = {https://www.itec.aau.at/bib/files/AXMEDIS2006MPEG21CrossResourceAdaptationDecisionTaking.pdf}, talkdate = {2006.12.13}, talktype = {registered} }