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International Conference on Wireless Networks, Communications and Mobile Computing

作者： De Angelis, F Habib, I CUNY City Coll New York NY 10031 USA

ISBN: (纸本)0780393058

This paper presents tin adaptive filtering algorithm for the delivery of multimedia content with different qualify of service (QoS) requirements in time-varying wideband code-division multiple access (W-CDMA) cellular networks. The algorithm objective is to guarantee levels of quality for two different user defined profiles (Premium, or Economy), while attempting to maximize the allocation of the radio channel bandwidth and maintaining the QoS requirements of downloaded traffic flows (audio, video, and data). Our proposed solution is based upon utilizing Genetic algorithms (GAs) to solve a multi-objective function that selects, during a control period, the bit rates and formats for the media codecs of downloaded traffic flows and assigns the air interface channel rate and power to each user, subject to different constraints. To show the performance of the algorithm, W-CDMA systems with and without filtering capabilities are compared.

关键词： adaptive filters bandwidth allocation broadband networks cellular radio code division multiple access filtering theory genetic algorithms multimedia communication quality of service QoS adaptive filtering algorithm code-division multiple access genetic a adaptive filters Code division multiple access Quality of service Genetic Algorithm (GA) multimedia services WCDMA filtering theory Broadband networks bandwidth allocation multimedia content Traffic flow audio video

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Building multicast trees for multimedia streaming in heterogeneous P2P networks

Building multicast trees for multimedia streaming in heterog...

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

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

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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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Moving away from narrow-scope solutions in multimedia content analysis

Moving away from narrow-scope solutions in multimedia conten...

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2nd European Workshop on the Integration of Knowledge, Semantics and Digital Media Technology, EWIMT 2005

作者： Hanjalic, Alan Nesvadba, Jan Benois-Pineau, Jenny Department of Mediamatics Delft University of Technology Delft Netherlands Storage Systems and Applications Group Philips Research Eindhoven Netherlands LABRI UMR CNRS 5800 University of Bordeaux 1 France

ISBN: (纸本)0863415954

Recent research results in the field of multimedia content Analysis (MCA) have been marked by an abundance of theoretical and algorithmic solutions covering narrow application domains only. In this paper we analyze this tendency and its origin in more detail and explain why, in our view, this should not be considered "the way to go" in providing easy access to content in multimedia systems and applications of the future. In particular, we concentrate on the case study of digital video, which we see as a straightforward example of multimedia. Through this case study we will discuss the needs and challenges of improving the generic potential of MCA algorithms.

关键词： multimedia systems

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A content-based methodology for power-aware motion estimation architecture

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IEEE TRANSACTIONS ON CIRCUITS AND systems ii-EXPRESS BRIEFS 2005年第10期52卷 631-635页

作者： Cheng, HW Dung, LR Natl Chiao Tung Univ Dept Elect & Control Engn Hsinchu 300 Taiwan

This paper presents a novel power-aware motion estimation algorithm, called adaptive content-based subsample algorithm (ACSA), for battery-powered multimedia devices. While the battery status changes, the architecture adaptively performs graceful tradeoffs between power consumption and compression quality. As the available energy decreases, the algorithm raises the subsample rate for maximizing battery lifetime. Differing from the existing subsample algorithms, the content-based algorithm first extracts edge pixels from a macro-block and then subsamples the remaining low-frequency part. In this way, we can alleviate the aliasing problem and thus keep the quality degradation low as the subsample rate increases. As shown in experimental results, the architecture can dynamically operate at different power consumption modes with little quality degradation according to the remaining capacity of battery pack while the power overhead of edge extraction is under 0.8%.

关键词： content-based image processing motion estimation (ME) power-aware system subsample algorithm very large-scale integration (VLSI) architecture video compression VLSI image processing

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

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

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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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Evaluation of a monitoring-based architecture for delivery of high quality multimedia content

Evaluation of a monitoring-based architecture for delivery o...

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10th IEEE Symposium on Computers and Communications

作者： Coppens, J Wauters, T De Turck, F Dhoedt, B Demeester, P Univ Ghent Dept Informat Technol B-9000 Ghent Belgium

ISBN: (纸本)0769523730

Currently, a lot of research has been devoted to (i) content distribution, (ii) traffic engineering, (iii) network monitoring and (iv) service enabling platforms. However, the integration of these four individual concepts in a single platform has not yet been studied in enough detail. In this paper we present an architecture for such a robust content delivery service. The combination of both distributed replication of videos and multi-source traffic engineering tackles specific problems such as congested network parts, overloaded servers and the occurrence of flash crowds. Contrary to most existing systems, the content placement and retrieval algorithms in the presented CDN obtain precise network state information from an integrated monitoring system, allowing even a higher efficiency. To validate the performance of the CDN, an exact placement ILP formulation and various RPA heuristics are implemented and simulated.

关键词： multimedia systems

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Advances in multimedia Information systems - 11th International Workshop, MIS 2005, Proceedings

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11th International Workshop on Advances in multimedia Information systems, MIS 2005

ISBN: (纸本)3540287922

The proceedings contain 18 papers. The topics discussed include: early data tailoring for ubiquitous information access in highly dynamic environments;one to many 3D face recognition enhanced through k-d-Tree based spatial access;a rule based approach to message borad topics classification;an indexing approach for representing multimedia objects in high-dimensional spaces based on expectation maximization algorithms;the MX formalism for semantic web compatible representation of music metadata;icon language-based auxiliary communication system interface for language disorders;intelligent delivery of multimedia content in a device aware ubiquitous environments;and harmonic block windows through harmonic windows scheduling.

关键词： multimedia 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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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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Differentiation of traffic on access networks

Differentiation of traffic on access networks

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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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