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

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Achieving Interoperability in Conditional access systems through the Dynamic Download and Execution of Cryptographic Software for the IPTV System

Achieving Interoperability in Conditional Access Systems thr...

引用

International conference on Convergence Information Technology

作者： Jinyoung Moon Jungtae Kim Jongyoul Park Euihyun Paik U-Computing Research Group Electronics and Telecommunications Research Institute South Korea

An IPTV system that transmits multimedia contents through the IP network needs to adopt a conditional access system allowing the only entitled subscribers to view the premium content as other pay-TV systems do. Although several standard specifications have been published for interoperable models of conditional access systems, the proposed models are based on the unidirectional or restricted bidirectional broadcasting network and do not utilize the characteristics of the IP network. However, software download scheme through the bidirectional IP network enables it to change existing conditional access systems in a secure way. This paper introduces an interoperable conditional access system that can update any cryptographic software provided by different conditional access system vendors through downloading and executing dynamically the downloaded conditional access software only if the software follows the pre-defined interfaces.

关键词： Cryptography IPTV IP networks Software algorithms Satellite broadcasting multimedia systems Security multimedia communication Information technology Moon

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Embedded Multi-Channel Video Encoder Based on DSP

Embedded Multi-Channel Video Encoder Based on DSP

引用

5th IEEE International Symposium on Embedded Computing

作者： Yao Chunlian Li Wei Meng Qinglei Gao Lihua Beijing Technol & Business Univ Sch Digital Content Beijing 100037 Peoples R China Beihang Univ Sch Comp Sci & Engn Digital Media Lab Beijing 100083 Peoples R China

ISBN: (纸本)9780769533483

To satisfy the requirement of embedded video encoder in various scenarios, an embedded multi-channel video coding system based on multimedia processor-DM642 DSP is designed in this paper. For real-time application requirement, we optimize the encoder at three levels: Firstly, at algorithm level, develop some fast algorithm fitting for LISP;secondly, at system level, adjust the architecture of encoder and optimization data transfer with EDMA;thirdly, at code level, use linear assembly for key code. Experimental results show that the embedded video encoder can compress four channel CIF video data real-time.

关键词： Digital signal processing Video compression Digital signal processing chips Real time systems Signal processing algorithms Hardware Random access memory Video coding Application software Switches

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An agent framework based on signal concepts for highlighting the image semantic content

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19th International conference on Database and Expert systems Applications

作者： Belkhatir, Mohammed Monash Univ Ctr Multimedia Comp Commun & Applicat Clayton Vic 3800 Australia

ISBN: (纸本)9783540856535

This paper addresses the image semantic gap (i.e. the difficulty to automatically characterize the image semantic content through extracted low-level signal features) by investigating the formation of semantic concepts (such as mountains, sky, grass...) in a population of image agents: abstract structures representing the image visual entities. Through the development of processes mapping extracted low-level features to concept-based visual information, our contribution is twofold. First, we propose a learning framework mapping signal (color, texture) and semantic concepts to highlight the image agents. Contrary to traditional architectures considering high-dimensional spaces of low-level extracted signal features, this framework addresses the curse of dimensionality. Then, at the image agent population level, the agents communicate about the perceived semantic concepts with no access to global information or to the representations of other agents, they only exchange conceptual information. While doing so they adapt their internal representations to be more successful at conveying the perceived semantic information in future interactions. The image content is therefore soundly inferred through these concept-based linguistic interactions. The SIR1_Agent prototype implements our theoretical framework and its architecture revolves around functional modules enabling the characterization of concept-based linguistic structures, highlighting the image agents and enforcing interactions and coordination between them.

关键词： semantic-based image indexing & retrieval multi-agent systems

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Design of a recommender system for mobile tourism multimedia selection

Design of a recommender system for mobile tourism multimedia...

引用

International conference on Internet multimedia Services Architecture and Applications, IMSAA

作者： Robert P. Biuk-Aghai Simon Fong Yain-Whar Si Department of Computer and Information Science Faculty of Science and Technology University of Macau Taipa Macao China

Applications that deliver multimedia content to and display such content on mobile devices have become increasingly common in recent years. When faced with a large amount of content, unfamiliar users can make use of each otherspsila recommendations, through recommender systems, to find content of interest to them. As a case in point we present the design of a recommender system that can be used by tourists to request a travel itinerary, and subsequently browse multimedia content for each recommended tourist spot. The techniques combined in our recommender system include genetic algorithms and fuzzy logic. Recommendations are chosen to match a user profile based on a userpsilas personal preferences. Our system design has wide applicability in multimedia systems where the user requires assistance in content selection.

关键词： Recommender systems multimedia systems Fuzzy logic Genetic algorithms Mobile computing Job shop scheduling Computer displays Algorithm design and analysis Processor scheduling Ubiquitous computing

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Proceedings - P2P'08, 8th International conference on Peer-to-Peer Computing

Proceedings - P2P'08, 8th International Conference on Peer-t...

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P2P'08, 8th International conference on Peer-to-Peer Computing

ISBN: (纸本)9780769533186

The proceedings contain 42 papers. The topics discussed include: transaction rate limiters for peer-to-peer systems;incentives against hidden action in QoS overlays;securing peer-to-peer content sharing service from poisoning attacks;popularity-aware prefetch in P2P range caching;query workload driven summarization for P2P query routing;Chordella- a hierarchical peer-to-peer overlay implementation for heterogeneous, mobile environments;visualizing transactional algorithms for DHTs;a NAT traversal mechanism for peer-to-peer networks;P2P information retrieval and filtering with MAPS;hierarchical codes: how to make erasure codes attractive to peer-to-peer storage systems;EAD: an efficient and adaptive decentralized file replication algorithm in P2P file sharing systems;and towards an incentive mechanism for peer-to-peer multimedia live streaming systems.

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Satcom convergence in the IP multimedia Subsystems (IMS)

Satcom convergence in the IP Multimedia Subsystems (IMS)

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作者： Le Saux, Michèle Donadio, Roberto Pirio, Stéphane European Space Agency TEN-TTG Postbus 299 2200 AG Noordwijk Netherlands

ISBN: (纸本)9781563479410

The role of satellite telecommunications systems in the Next Generation Networks (NGN) has so far been peripheral. Satellites have been used for years for broadcasting, multicasting and content contribution in the radio and television world. They have been used for IP connectivity to large under-serviced areas. They have been used for mobile communications with systems such as Inmarsat. However, most satellite networks have been stand-alone and have not seen a tight integration with the terrestrial fixed and mobile network operators. The European Space Agency is supporting research and development in space telecommunications within its Advanced Research in Telecommunications systems (ARTES) programme in order to help European and Canadian industry in their efforts to maintain competitiveness on the world market. In the area of satellite telecommunications systems and ground segment, several activities have been devoted to the development of new-generation two-way satellite IP-access networks for the provision of Internet services. A strategic element of our activities is to ensure that satellite networks and components can be seamlessly integrated in commercial terrestrial telecommunications networks. With this purpose in mind, the Agency has issued tenders to investigate the role of satellite in the context of the IP convergence process and the IP multimedia Subystem (IMS). The objective of these projects is to demonstrate that satcom broadband systems can be seamlessly integrated within an IMS network, with compatible protocols and performance allowing the support of advanced multimedia applications. Copyright © 2008 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

关键词： Competition

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MPEG-7 enhanced ubi-multimedia access —Convergence of user experience and technology

MPEG-7 enhanced ubi-multimedia access —Convergence of user ...

引用

IEEE International conference on Ubi-Media Computing

作者： Yong Rui Microsoft Research Redmond WA USA

ISBN: (纸本)9781424418657

Unlike early versions of MPEG, MPEG-7 is shifting from a data-compression standard to a multimedia content description standard. As a result, it will have much broader implications for the human-computer interaction research. There are countless ways that the MPEG-7 metadata description framework can enhance userspsila experiences in accessing multimedia content. In this paper, we will report the algorithms that we developed for automatic generation of MPEG-7psilas description schemes (DSs): a video Table of contents DS to enhance active video browsing, a Summary DS to enable direct use of a meta-data producerpsilas annotation, and a Still Image DS to allow interactive content-based image retrieval. Experimental results and user studies demonstrated the usefulness of MPEG-7psilas meta-data framework and effectiveness of our proposed automatic DS generation techniques.

关键词： MPEG 7 Standard Transform coding Human computer interaction Signal processing algorithms Video compression Streaming media Image retrieval content based retrieval Watches Video on demand

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Smart content delivery on the Internet

Smart content delivery on the Internet

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8th International conference on algorithms and Architectures for Parallel Processing, ICA3PP 2008

作者： Shen, Hong School of Computer Science University of Adelaide

ISBN: (纸本)9783540695004

As the ever-growing Internet applications in the emerging e-society are centered in sharing of various types of digital contents, content delivery on the Internet as a hot topic has been attracting most attentions. Web caching is an important technology for improving the efficiency of content delivery. As an emerging technology en-route caching computes locations among caches on access paths to store copies of an object such that specified objectives (such as satisfying future access demands to the object) are achieved. In this talk, I will first give an overview on recent developments in efficient content delivery. I will then introduce our recent work in tackling this problem by applying the technique of en-route caching, and present efficient solutions to the problem in systems containing single server and multiple servers respectively. While the problem is NP-hard in the general case, our solutions apply dynamic programming technique and run in polynomial-time in the worst case for both unconstrained and constrained cases in the network topologies of trees (for broadcast delivery) and linear arrays (for point-to-point delivery) respectively. They are shown theoretically either optimal or convergent to optimal. Finally, I will show some possible extensions of our solutions to other system settings. © 2008 Springer-Verlag Berlin Heidelberg.

关键词： Dynamic programming

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EM Combination Channel Estimation Algorithm for Interleave-Division Multiple access systems

EM Combination Channel Estimation Algorithm for Interleave-D...

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International conference on multimedia and Information Technology, MMIT

作者： Feng Yang Jianhao Hu Xingzhong Xiong National Key Laboratory of Communication University of Electronic Science and Technology Chengdu China National Key Laboratory of Communication University of Electronic Science and Technology Zigong China Sichuan University of Science and Engineering China

A new channel estimation approach based on expectation maximization (EM) algorithm is proposed for the interleave-division multiple access systems (IDMA). The combination channel estimation is used in the proposed algorithm. The pilot sequences are used to estimate the channel information at the first iteration. The pilot and the soft estimates from the decoders are combined to refine the channel coefficients in the following estimation iterations. The proposed approach greatly reduces the complexity. The simulation results indicate that the bit-error-rate performance of the proposed algorithm is very close to that of ideal channel estimation and the algorithm based on posteriori information is more accurate than that using extrinsic information.

关键词： Channel estimation Signal processing algorithms Multiaccess communication Statistics Iterative algorithms Multiuser detection Iterative decoding Multiple access interference Intersymbol interference multimedia systems

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Universal multimedia access Model for Video Delivery

Universal Multimedia Access Model for Video Delivery

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International conference on Grid and Pervasive Computing Workshops, GPC

作者： Svetlana Kim Yong-Ik Yoon Department of Multimedia Science Sookmyung Women''s University Seoul South Korea

The multimedia content delivery chain poses today many challenges. There are increasing terminal diversity, network heterogeneity and the pressure to satisfy the user preferences. The situation encourages the need for the customized contents in order to provide the user in the best possible experience. In this paper, we address the problem of multimedia customization. For the customized content, we suggest the UMA (universal multimedia access) model that uses the multimedia content description MPEG-7 standard and the MPEG-21 multimedia framework.

关键词： multimedia computing MPEG 7 Standard Bandwidth Probes Standards development Auditory displays Pervasive computing Videoconference Cities and towns multimedia systems

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