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检索条件"任意字段=Conference on Multimedia Content Access - Algorithms and Systems II"

共 179 条记录，以下是111-120 订阅

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Building multicast trees for multimedia streaming in heterogeneous P2P networks

Building multicast trees for multimedia streaming in heterog...

引用

International conference on systems Communications

作者： Tan, XR Datta, S York Univ Dept Comp Sci & Engn Toronto ON M3J 2R7 Canada

ISBN: (纸本)0769524222

P2P networks have been proposed as a scalable, inexpensive solution to the problem of distributing multimedia content over the Internet. Since real P2P systems exhibit considerable heterogeneity in hardware, software and network connections, the design of P2P streaming networks must factor in this variation. There are two different sources of heterogeneity in P2P networks. Most existing work in the literature handle heterogeneity among receivers and requirements by the use of different multimedia encodings of the same content. In this paper we focus on the problems caused by heterogeneity in the network delays connecting receivers to the sender We assume that there is a single multicast tree and a single video stream. We propose new algorithms for building multicast trees for multimedia streaming in heterogeneous P2P networks. Our algorithms differ in the amount of communication and computational resources they require. We compare the performance (using simulations) of our algorithms with an existing algorithm Zigzag [20, 2 1]. Our results show that two of our algorithms (algorithm FollowTree-Landmark-ii and algorithm FollowTree) significantly outperform Zigzag.

关键词： Multicasting

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MediaAlert - A broadcast video monitoring and alerting system for mobile users 05

MediaAlert - A broadcast video monitoring and alerting syste...

引用

3rd International conference on Mobile systems, Applications and Services (MobiSys 2005)

作者： Wei, B Renger, B Chen, YF Jana, R Huang, H Begeja, L Gibbon, D Liu, Z Shahraray, B AT&T Labs Res Florham Pk NJ 07932 USA

ISBN: (纸本)1931971315

We present a system for automatic monitoring and timely dissemination of multimedia information to a range of mobile information appliances based on each user's interest profile. multimedia processing algorithms detect and isolate relevant video segments from over twenty television broadcast programs based on a collection of words and phrases specified by the user. content repurposing techniques are then used to convert the information into a form that is suitable for delivery to the user's mobile devices. Alerts are sent using a number of application messaging and network access protocols including email, short message service (SMS), multimedia messaging service (MMS), voice, session initiation protocol (SIP), fax, and pager protocols. The system is evaluated with respect to performance and user experiences. The MediaAlert system provides an effective and low-cost solution for the timely generation of alerts containing personal, business, and security information.

关键词： mobile devices multimedia processing content repurposing content adaptation service platform news monitoring automatic speech recognition (ASR) multimedia messaging alerting notification

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Integrated multi-objective cross-layer optimization for wireless multimedia transmission

Integrated multi-objective cross-layer optimization for wire...

引用

IEEE International Symposium on Circuits and systems (ISCAS)

作者： van der Schaar, M Tekalp, M Univ Calif Davis Davis CA 95616 USA

ISBN: (纸本)0780388348

Many cross-layer design approaches for wireless multimedia transmission over various networks have been proposed. Truly cross-layer design solutions require joint optimization of multimedia coding, transport/network layer, medium access layer, and physical layer transmission strategies and protocols. The solution often becomes impractical because: i) its computational complexity is high, and ii) it needs to be recomputed as some inputs, such as the content characteristics or network conditions change. To this effect, we propose a novel framework for cross-layer design, which features: i) the joint design strategy selection is adaptive not only to network conditions but also to multimedia content characteristics, ii) the joint design strategy selection is based on off-line learning to address the computational complexity issue, and iii) the off-line learning stage employs a new multiple objective optimization solution.

关键词： Computational complexity

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Differentiation of traffic on access networks

Differentiation of traffic on access networks

引用

1st International conference on multimedia Services access Networks (MSAN05)

作者： Luoma, M Huttunen, A Helsinki Univ Technol Espoo 02015 Finland

ISBN: (纸本)0780393198

Internet is facing a huge change with the increasing penetration of voice terminals and new P2P overlay networks. These changes hit on their hardest to access networks which on the same time need to cope with new stringent requirements of real-time traffic and increased volumes of P2P traffic. These two facts bring urgent need for differentiation of traffic in access networks - not only downstream hut also upstream. Majority of upstream traffic is metafile systems like BitTorrent and Gnutella which distribute the file content in overlay manner to each and every subscriber in metafile system. This brings new challenges for handling the traffic: i) from the user perspective, co-operation within the overlay community but still controlling the resource usage, and ii) from the network provider perspective, minimal waste of scarce access network resources. We show a measurement study of differentiation of IP traffic with goal to minimize the delay of real-time traffic and at the same time to minimize the packet loss of P2P traffic. Our results show that proper grouping of traffic is important at both ends of accesslink.

关键词： Telecommunication traffic

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An architecture of automating production of cross media content for multi-channel distribution

An architecture of automating production of cross media cont...

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1st International conference on Automated Production of Cross Media content for Multi-Channel Distribution

作者： Bellini, P Nesi, P Univ Florence DISIT DSI Distributed Syst & Internet Technol Lab I-50139 Florence Italy

ISBN: (纸本)076952348X

The digital-content market is urging better pricing and value-for-money for industry products and services. This is clearly evident in the recent price policies of majors. Production costs must be drastically reduced without affecting product quality. content providers, aggregators and distributors constantly need to adopt innovative means of increasing efficiency in order to reduce cost. Possible solutions to this challenge could be found by automating, accelerating and restructuring production processes. AXMEDIS architecture and tools aim at reaching those results by: (i) reducing costs for content production with artificial intelligence algorithms for content composition, formatting, protection and workflow management, (ii) reducing distribution and integration costs, increasing accessibility, with a P2P platform at B2B level integrating content management systems and workflows, (iii) providing algorithms and tools for innovative and flexible Digital Rights Management, exploiting MPEG-21 and overcoming its limits, supporting several business and transactions models. AXMEDIS is a large IST FP6 Integrated Project on Research and Development.

关键词： multimedia systems

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Developing a comprehensive system for content-based retrieval of image and text data from a national survey

Developing a comprehensive system for content-based retrieva...

引用

Medical Imaging 2005 conference

作者： Antani, S Natarajan, M Long, JL Long, LR Thoma, GR NIH Lister Hill Natl Ctr Biomed Commun Natl Lib Med DHHS Bethesda MD 20894 USA

ISBN: (纸本)0819457221

The article describes the status of our ongoing R&D at the U.S. National Library of Medicine (NLM) towards the development of an advanced multimedia database biomedical information system that supports content-based image retrieval (CBIR). NLM maintains a collection of 17,000 digitized spinal X-rays along with text survey data from the Second National Health and Nutritional Examination Survey (NHANES ii). These data serve as a rich data source for epidemiologists and researchers of osteoarthritis and musculoskeletal diseases. It is currently possible to access these through text keyword queries using our Web-based Medical Information Retrieval System (WebMIRS). CBIR methods developed specifically for biomedical images could offer direct visual searching of these images by means of example image or user sketch. We are building a system which supports hybrid queries that have text and image-content components. R&D goals include developing algorithms for robust image segmentation for localizing and identifying relevant anatomy, labeling the segmented anatomy based on its pathology, developing suitable indexing and similarity matching methods for images and image features, and associating the survey text information for query and retrieval along with the image data. Some highlights of the system developed in MATLAB and Java are: use of a networked or local centralized database for text and image data;flexibility to incorporate new research work;provides a means to control access to system components under development;and use of XML for structured reporting. The article details the design, features, and algorithms in this third revision of this prototype system, CBIR3.

关键词： content-based image retrieval (CBIR) NHANES ii anterior osteophytes medical image databases medical image informatics image segmentation shape similarity procrustes distance Fourier descriptors polygon approximation

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Ontology-Based access to multimedia Cultural Heritage Collections - The REACH Project

Ontology-Based Access to Multimedia Cultural Heritage Collec...

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Eurocon

作者： C. Doulaverakis Y. Kompatsiaris M.G. Strintzis Centre for Research and Technology Informatics and Telematics Institute Thessaloniki Greece Information Processing Laboratory Electrical and Computer Engineering Department Aristotle University of Thessaloniki Thessaloniki Greece

In this paper, an approach for providing unified access to heterogeneous distributed cultural heritage collections is presented. The proposed approach is developed within the framework of the REACH Greek National Project with the overall aim to provide a Web portal enabling access to different databases of cultural content with emphasis on multimedia material. In order to achieve this, the project employs ontology-based representation of cultural content, multimedia content-based search algorithms, hybrid ontology and content-based access and user-friendly search interfaces. This fusion approach provides users with resources for building queries of multimedia repositories sequentially using multiple individual search tools, and performs higher quality searching. In the current stage of development, real content such as inscriptions and coins from the Greco-Roman time period, has successfully been incorporated in the system

关键词： Ontologies Cultural differences Portals multimedia databases Information retrieval content based retrieval Material storage multimedia systems Informatics Telematics

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Distributed content adaptation for pervasive systems

Distributed content adaptation for pervasive systems

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International conference on Information Technology: Coding and Computing (ITCC)

作者： G. Berhe L. Brunie J.-M. Pierson Lyon Research Center for Images and Intelligent Information Systems Institut National des Sciences Appliquées de Lyon France

Pervasive systems are created by introducing wireless communication into distributed multimedia systems. These systems facilitate mobile data access to applications such as health care, tourism and emergency. However new challenges have emerged that has not been adequately addressed in traditional distributed multimedia systems. In pervasive systems, data must be adapted to the user's preferences, device capabilities and network conditions. Several content adaptation techniques have been proposed to fit the data to the usage environment. In this paper we present a distributed content adaptation framework (DCAF) for distributed multimedia systems and its prototype implementation. The architecture takes into consideration client profile, network conditions, content profile (meta-data) and available adaptation services (third party software elements) to construct an optimal dynamic adaptation graph.

关键词： multimedia systems Streaming media Wireless communication Pervasive computing Personal digital assistants Displays Hardware Image converters Software performance Intelligent systems

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An architecture of automating production of cross media content for multi-channel distribution

An architecture of automating production of cross media cont...

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International conference on Automated Production of Cross Media content for Multi-Channel Distribution (AXMEDIS)

作者： P. Bellini P. Nesi DISIT University of Florence Via S. Marta Florence Italy

The digital-content market is urging better pricing and value-for-money for industry products and services. This is clearly evident in the recent price policies of majors. Production costs must be drastically reduced without affecting product quality. content providers, aggregators and distributors constantly need to adopt innovative means of increasing efficiency in order to reduce cost. Possible solutions to this challenge could be found by automating, accelerating and restructuring production processes. AXMEDIS architecture and tools aim at reaching those results by: (i) reducing costs for content production with artificial intelligence algorithms for content composition, formatting, protection and workflow management, (ii) reducing distribution and integration costs, increasing accessibility, with a P2P platform at B2B level integrating content management systems and workflows, (iii) providing algorithms and tools for innovative and flexible digital rights management, exploiting MPEG-21 and overcoming its limits, supporting several business and transactions models. AXMEDIS is a large IST FP6 Integrated Project on Research and Development.

关键词： Grid computing multimedia systems Resource management content management multimedia computing Distributed computing Production systems Marketing and sales Acceleration Optimization methods

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4th International IFIP-TC6 Networking conference, NETWORKING 2005

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4th International IFIP-TC6 Networking conference, NETWORKING 2005

ISBN: (纸本)9783540258094

The proceedings contain 143 papers. The special focus in this conference is on Peer-to-peer networks, Performance of internet protocols I, Wireless security, Network security, Wireless performance, Network service support, Network modeling and simulations, Wireless LANs, Optical networking, Performance of internet & web applications, Ad Hoc networks I, Adaptive networking;Performance of internet protocols ii, Radio resource management, Internet routing, Queuing models, Network monitoring, measurement and profiling, Network management systems;Sensor and Ad Hoc networks, Overlay multicast, Quality of service, Wireless scheduling, Improving multicast communication, Traffic management and engineering I, Ad Hoc networks ii, Traffic management and engineering ii, Mobility management, Bandwidth management, CDMA, Wireless resource management and Posters. The topics include: Topology-aware peer-to-peer on-demand streaming;the scalability of swarming peer-to-peer content delivery;leopard;decentralized and secure accounting for peer-to-peer applications;highly responsive and efficient QoS routing using pre- and on-demand computations along with a new normal measure;experiences and analyses;a formal, comprehensive metric for packet reordering;batch scheduling algorithms for optical burst switching networks;ECC based threshold cryptography for secure data forwarding and secure key exchange in MANET (I);mutual authentication and key exchange protocols with anonymity property for roaming services;an energy-efficient image representation for secure mobile systems;efficient clustering for multicast key distribution in MANETs;using secure coprocessors to protect access to enterprise networks;trusted security devices for bandwidth conservation in IPSec environments and lightweight internet permit system for stopping unwanted packets.

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