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检索条件"任意字段=Conference on Multimedia Computing and Networking"

共 2928 条记录，以下是2211-2220 订阅

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FlexSplit: A workload-aware, adaptive load balancing strategy for media clusters

FlexSplit: A workload-aware, adaptive load balancing strateg...

引用

conference on multimedia computing and networking 2006

作者： Zhang, Q Cherkasova, L Smirni, E Coll William & Mary Dept Comp Sci Williamsburg VA 23187 USA

ISBN: (纸本)0819461113

A number of technology and workload trends motivate us to consider a new request distribution and load balancing strategy for streaming media clusters. First, in emerging media workloads.. a significant portion of the content is short and encoded at low bit rates. Additionally, media workloads display a strong temporal and spatial locality. This makes modern servers with gigabytes of main memory well suited to deliver a large fraction of accesses to popular files from memory. Second, a specific characteristic of streaming media workloads is that many clients do not finish playing an entire media file which results from the browsing nature of a large fraction of client accesses. In this paper, we propose and evaluate two new load-balancing strategies for media server clusters. The proposed strategies, FlexSplit and FlexSplitLard aim to efficiently utilize the combined cluster memory by exploiting specific media workload properties by "tuning" their behavior to media file popularity changes. The ability of the proposed policies to self-adapt to changing workloads across time while maintaining high performance makes these strategies an attractive choice for load balancing in media server clusters.

关键词： Video Computer programming Microelectromechanical systems Computer simulations Data modeling multimedia Performance modeling Video coding Computer science Roads

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TCP-friendly rate control for streaming service over 3G network

TCP-friendly rate control for streaming service over 3G netw...

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2nd IEEE International conference on Wireless Communications, networking and Mobile computing (WiCOM 2006)

作者： Fu, Youming Hu, Ruimin Tian, Gang Wang, Zhongyuan Wuhan Univ Sch Comp Wuhan 430072 Peoples R China Wuhan Univ Natl Multimedia Software Engn Res Ctr Wuhan 430072 Peoples R China

ISBN: (纸本)9781424405169

Rate control is an important issue in streaming applications over wireless network. TFRC is a widely accepted rate control protocol in wired networks, but it has a serious shortcoming that it cannot distinguish the wireless channel error based loss rate from the total packet loss rate measured at streaming client. In this paper, we focus on wireless streaming over 3G network and propose an amended TCP-friendly rate control protocol TFWSRC which makes use of the characteristic of 3G network to distinguish the congestion based packet loss rate from the total packet loss rate. TFWSRC proposes a convenient method to measure the total end to end packet loss rate without considering the jitter problem. It not only inherit the TCP-friendly features of TFRC and also adopts a flexible Increasing strategy of packet sending rate to ensure the presentation quality at streaming client.

关键词： TCP-friendly streaming rate control key packet

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Sender-driven bandwidth differentiation for transmitting multimedia flows over TCP

Sender-driven bandwidth differentiation for transmitting mul...

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conference on multimedia computing and networking 2006

作者： Lau, KH Lee, JYB Chinese Univ Hong Kong Dept Informat Engn Hong Kong Hong Kong Peoples R China

ISBN: (纸本)0819461113

Over the years the Internet has shown extraordinary scalability and robustness in spite of the explosive growth in geographical reach, user population size, as well as network traffic volume. This scalability and robustness is, in no small part, supported by the Internet's transport protocols, the Transmission Control Protocol (TCP) in particular. Nevertheless, with the rapid growth of multimedia-rich contents in the Internet, such as audio and video, the many strengths of TCP in data delivery are slowly imposing bottlenecks in multimedia data delivery where different media data flows often have different needs for bandwidth. As TCP's congestion control algorithm enforces fair bandwidth sharing among traffic flows sharing the same network bottleneck, different media data flows will receive the same bandwidth irrespective of the actual needs of the multimedia data being delivered. This work addresses this limitation by proposing a new algorithm to achieve non-uniforrn bandwidth allocation among TCP flows originating from the same sender passing through the same network bottleneck to multiple receivers. The proposed algorithm, called Virtual Packet Substitution (VPS), has four desirable features: (a) it allows the allocation of bottleneck bandwidth between a group of TCP flows;(b) the resultant traffic flows as a whole, maintain the same fair bandwidth sharing property with other competing TCP flows;(c) it can be implemented entirely in the sender's TCP protocol stack;and (d) it is compatible with and does not require modification to existing TCP protocol stack at the clients. Simulation results show that the proposed VPS algorithm can achieve accurate bandwidth allocation while still maintaining fair bandwidth sharing with competing TCP flows.

关键词： TCP-friendliness proportional fairness video streaming quality of service packet substitution

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DagStream: Locality aware and failure resilient peer-to-peer streaming

DagStream: Locality aware and failure resilient peer-to-peer...

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conference on multimedia computing and networking 2006

作者： Liang, J Nahrstedt, K Univ Illinois Champaign IL 61820 USA

ISBN: (纸本)0819461113

Live peer to peer (P2P) media streaming faces many challenges such as peer unreliability and bandwidth heterogeneity. To effectively address these challenges, general "mesh" based P2P streaming architectures have recently been adopted. Mesh-based systems allow peers to aggregate bandwidth from multiple neighbors, and dynamically adapt to changing network conditions and neighbor failures. However, a drawback of mesh-based overlays is that it is difficult to guarantee network connectivity in a distributed fashion, especially when network locality needs to be optimized. This paper introduces a new P2P streaming framework called DagStream, which (1) organizes peers into a directed acyclic graph (DAG) where each node maintains at least k parents, thus has provable network connectivity (and hence failure resilience), and (2) enables peers to quickly achieve locality awareness in a distributed fashion, thus ensures efficient network resource usage. Our experiment results in both simulation and wide area environment show that with our DagStrearn protocol, peers can quickly self-organize into a locality aware DAG. Further, by selecting additional parents as needed, peers can achieve good streaming quality commensurate with their downlink bandwidth.

关键词： Electronic support measures Data modeling Systems modeling Computer programming Failure analysis Receivers Video Electronic imaging Internet multimedia

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A Hidden Proxy for Seamless & ABC multimedia Mobile Blogging

A Hidden Proxy for Seamless & ABC Multimedia Mobile Blogging

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3rd IEEE Consumer Communications and networking conference

作者： Ghini, Vittorio Cacciaguerra, Stefano Panzieri, Fabio Salomoni, Paola Univ Bologna Dept Comp Sci I-40127 Bologna Italy

ISBN: (纸本)9781424400850

The availability of smart portable telephones, equipped with cameras and microphones, enables portable phone users to capture fragments of audio and video, taken directly from their daily lives. Thus, a new generation of mobile blogs, termed "moBlogs ", is emerging. Conceptually similar to textual Web logs' moBlogs collect text, images, audio and video, captured by mobile devices, and make them available on-line. In addition, the availability of different connectivity options on board the same portable phone (from Bluetooth, through 2.5/3G to WLAN) can improve the ability of the phone users to browse and update the moBlogs of interest to them. Within this scenario, in order to simplify the development of mobile applications for smart portable phones, and to enhance their reusability, it is necessary to provide those applications with appropriate communication support that shields them from the heterogeneities of the multiple connectivity options mentioned above. In this sense, the paper presents an application-transparent middleware designed and developed to provide mobile applications with end-to-end, Always Best Connected (ABC), and seamless connectivity, even in case of handoff events and network interface reconfigurations.

关键词： Mobile computing

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HoLiSTiC: Heterogeneous lightweight sensornets for trusted visual computing

HoLiSTiC: Heterogeneous lightweight sensornets for trusted v...

引用

International conference on Intelligent Information Hiding and multimedia Signal Processing

作者： Kundur, Deepa Okorafor, Unoma Ndili Luh, William Department of Electrical and Computer Engineering

ISBN: (纸本)9780769527451

This paper introduces a novel "HoLiSTiC" framework for visual sensor networks (VisSNs) and studies security issues within this context. The HoLiSTiC paradigm, which encompasses many existing VisSN proposals, effectively exploits heterogeneous wireless sensing and communications for more flexible, practical and scalable visual surveillance. Security aspects of HOLISTIC are considered by highlighting open research problems. Secure routing issues in unidirectional optical free-space sensor networks that form the foundation of the HoLiSTiC transport network are discussed. In addition, a novel distributed security paradigm based on independent media sharing is presented to demonstrate how the interaction of signal processing, networking, and cryptography can benefit VisSNs.

关键词： Video signal processing

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Scheduled RSS feeds for streaming multimedia to the desktop using RSS Enclosures

Scheduled RSS feeds for streaming multimedia to the desktop ...

引用

2006 3rd IEEE Consumer Communications and networking conference, CCNC 2006

作者： Curran, Kevin Kinney, Sheila Me Burns, Fergus Meredith, Gary School of Computing and Intelligent Systems University of Ulster Bangor United Kingdom HookableMedia Ltd Sligo IT Incubator Centre Sligo Ireland

ISBN: (纸本)1424400856

Viewing video on the Internet can be troublesome as once a link is clicked on, there inevitably follows a delay while the stream is being buffered. Rich Site Summary (RSS) technology is a web content syndication format commonly used to organise news and the content of news-like sites. RSS has been extended to include tags known as RSS enclosures which allow audio and video to be described in terms of location, duration and size. Once data about each element is established in an RSS format, a program called an aggregator can check the feed frequently for changes and updates and act accordingly. This paper documents a scheduled RSS multimedia prototype which utilises idle computer time (at night) to subscribe to media RSS channels in order to download audio and video content. ©2006 IEEE.

关键词： multimedia systems

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Optimization of an AVS audio decoder on DSP

Optimization of an AVS audio decoder on DSP

引用

2006 International conference on Wireless Communications, networking and Mobile computing, WiCOM 2006

作者： Shuixian, Chen Haojun, Ai Ruimin, Hu Yuhong, Yang Computer School Wuhan Univ. Wuhan 430079 China National Engineering Research Center for Multimedia Software Wuhan Univ. Wuhan 430079 China Hubei Multimedia Network Communications Engineering Laboratory Wuhan Univ. Wuhan 430079 China

ISBN: (纸本)1424405173

The part III of Audio Video Standard of China (AVS) is the first Hi-Fi audio coding standard in China public domain. Through nonlinear quantization and Context-dependent Bitplane entropy Coding (CBC), it offers distinct features of nonlinear quantization noise adaptation and high efficiency Fine Grain Scalability (FGS), but also imposes great challenges on fixed-point implementation with high precision requirement and stringent computational resource restriction. This paper presents tuned optimization strategies for fixed-point arithmetic, buffer manipulation, entropy decoding, and CBC decoding loop reduction to address the challenges. The demonstration real-time implementation on fixed-point DSP TMS320C5509A shows that our design optimization cuts down computational complexity from over 200 MIPs to 60 MIPs while preserving over 15 effective bits precision for 16-bit PCM output. © 2006 IEEE.

关键词： Speech coding

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Novel convergence model for efficient error concealment using information hiding in multimedia streams

Novel convergence model for efficient error concealment usin...

引用

International conference on Signal Processing, Communications and Networks

作者： Kannan, Prasanna

ISBN: (纸本)9781424409969

Error concealment using information hiding has been an efficient tool to combat channel impairments that degrade the transmitted data quality by introducing channel errors/packet losses. The proposed model takes a stream of multimedia content and the binarised stream is subjected to bit level enhanced mapping procedure (PRASAN - Enhanced NFD approach) accompanied with a set of convergence models that ensure a high degree of convergence for a given error norm. The mapping is performed between the current frames with respect to the previous frame in case of video data. This approach often referred to as the correlation generation is followed by convergence mathematical function generation. This function is derived based on trying out the various convergence methodologies in a weighted round robin environment and choosing the best matching function by computing the mean square error. This error is termed map-fault and is kept a minimum. The test data taken are subjected to noisy channel environments and the Power Signal to Noise Ratios obtained experimentally support firmly the advantage of the proposed methodology in comparison to existing approaches.

关键词： NFD convergence lagrange polynomials multimedia coding error concealment turbo coding information hiding PRASAN PRATM models optimum approximation and interpolating polymnomials

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Peer-to-peer multipoint video conferencing using layered video

Peer-to-peer multipoint video conferencing using layered vid...

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IEEE International conference on Image Processing (ICIP 2006)

作者： Akkus, Istemi Ekin Civanlar, M. Reha Oezkasap, Oeznur Kochi Univ Bilgisayar Muihendisligi Boluimui Istanbul Turkey

ISBN: (纸本)9781424404810

A new peer-to-peer architecture for multipoint video conferencing that targets end points with low bandwidth network connections (single video in and out) is presented. It enables end points to create a multipoint conference without any additional networking and computing resources than what is needed for a point-to-point conference. The new architecture is based on layered video coding with two layers at the end points. It allows each conference participant to see any other participant at any given time under all multipoint configurations of any number of users, with a caveat that some participants may have to receive only the base layer video. Layered encoding techniques usable within this architecture are described. A protocol for implementation of the new approach has been developed and simulated. Its performance is analyzed.

关键词： multimedia communication distributed computing teleconferencing internet

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