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检索条件"主题词=Multiple description coding"

共 417 条记录，以下是101-110 订阅

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On Symmetric multiple description coding

On Symmetric Multiple Description Coding

引用

IEEE Information Theory Workshop (ITW)

作者： Song, Lin Shao, Shuo Chen, Jun McMaster Univ Dept Elect & Comp Engn Hamilton ON L8S 4K1 Canada

ISBN: (纸本)9781479913213

We derive a single-letter lower bound on the minimum sum rate of multiple description coding with symmetric distortion constraints. For the binary uniform source with the Hamming distortion measure, this lower bound can be evaluated with the aid of a certain minimax theorem. A similar minimax theorem is established in the quadratic Gaussian setting, which is further leveraged to analyze the special case where the minimum sum rate subject to two levels of distortion constraints (with the second level imposed on the complete set of descriptions) is attained;in particular, we determine the minimum achievable distortions at the intermediate levels.

关键词： multiple description coding minimax theorem CENTROSYMMETRIC Lower bound minimum creep rate Minimum Flow abnormal shapes Distortion measurement Automatic incident detection

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Analysis of multiple description coding Algorithm with Time Division of Video Stream in Task of Multipoint Videoconferencing 1

Analysis of Multiple Description Coding Algorithm with Time ...

引用

1st International Scientific-Practical Conference on Problems of Infocommunications Science and Technology (PIC S&T)

作者： Tarakanov, Alexey Gushchina, Olga Yaroslavl State Univ Dept Phys Yaroslavl Russia

ISBN: (纸本)9781479973422

The paper presents analysis of multiple description coding (MDC) algorithm with time division of video stream and discussion of its efficiency in videoconferencing. Time division of video stream in two and three substreams are explored. Various video clips are used for experiments. Obtained results demonstrate that MDC with three descriptors can provide acceptable quality for decoded video in case when one of the descriptors (i.e. 33% of transmitted data) is totally lost.

关键词： multiple description coding videoconferencing H.264 video compression video quality

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AN ADAPTABLE SPATIAL-TEMPORAL ERROR CONCEALMENT METHOD FOR multiple description coding BASED ON ERROR TRACKING

AN ADAPTABLE SPATIAL-TEMPORAL ERROR CONCEALMENT METHOD FOR M...

引用

18th IEEE International Conference on Image Processing (ICIP)

作者： Yang, Meilin Comer, Mary L. Delp, Edward J. Purdue Univ Video & Image Proc Lab VIPER Sch Elect & Comp Engn W Lafayette IN 47907 USA

ISBN: (纸本)9781457713033

multiple description coding (MDC) is one of the most efficient methods to combat error-prone channels especially when retransmission is unacceptable. In applications involving scalable, multicast and P2P environments, it is advantageous to use more than two descriptions. In this paper, we present an adaptable temporal- spatial error concealment method based on error tracking to improve the performance of MDC. A Gilbert model is used as the channel model for burst packet loss simulation. Experimental results demonstrate the efficacy of the proposed method.

关键词： multiple description coding error concealment error tracking Gilbert model

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ERROR PROTECTION OF SCALABLE SOURCES: A COMPARATIVE ANALYSIS OF FORWARD ERROR CORRECTION AND multiple description coding

ERROR PROTECTION OF SCALABLE SOURCES: A COMPARATIVE ANALYSIS...

引用

16th International Conference on Digital Signal Processing

作者： Stoufs, Malyse R. Munteanu, Adrian Barbarien, Joeri Cornelis, Jan Schelkens, Peter IBBT Dept Elect & Informat ETRO B-1050 Brussels Belgium

ISBN: (纸本)9781424432974

In this paper we examine the Distortion-Rate (D-R) performance of two competing approaches for error-resilient transmission of scalable sources over error-prone packet-based memoryless channels. Thereby, we consider scalable Joint Source-Channel coding (JSCC) based on Forward Error Correction (FEC) and scalable multiple description coding (MDC). Our analysis considers memoryless Gaussian input sources encoded using source coders that can achieve theoretical performance bounds. This input source model is independent of actual implementations of the source coders and therefore allows drawing conclusions on the theoretical D-R performance of both approaches. Our comparative analysis indicates that in matched channel conditions, the use of an optimized FEC-based JSCC approach yields significantly better error resilience compared to the use of scalable MDC. Moreover, it is shown that in mismatched conditions a scalable JSCC approach has the potential to outperform a scalable MDC approach.

关键词： Scalable source coding multiple description coding forward error correction error resilience

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ILPS: A Scalable multiple description coding Scheme for H.264

ILPS: A Scalable Multiple Description Coding Scheme for H.26...

引用

2nd International Workshop on Future Multimedia Networking

作者： Favalli, Lorenzo Folli, Marco Univ Pavia Dipartimento Elettr I-27100 Pavia Italy

ISBN: (纸本)9783642024719

The most recent literature indicates multiple description coding (MDC) as a promising coding approach to handle the problem of video transmission over unreliable networks with different quality and bandwidth constraints. We introduce an approach moving from the concept of spatial MDC and introducing some algorithms to obtain sub-streams that are more efficient by exploiting some form of scalability. In the algorithm, we first generate four subsequences by sub-sampling, then two of these subsequences are jointly used to form each of the two descriptions. For each description, one of the original subsequences is predicted from the other one via some scalable algorithms, focusing on the inter layer prediction scheme. The proposed algorithm has been implemented as pre- and post-processing of the standard H.264/SVC coder. The experimental results are presented and we show it provides excellent results.

关键词： H.264/SVC multiple description coding scalability inter layer prediction

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multiple description coding Based On Multiwavelets Transforming

Multiple Description Coding Based On Multiwavelets Transform...

引用

2010 IEEE 2nd Symposium on Web Society

作者： Baobin Li School of Information Science and Engineering Graduate University of Chinese Academy of Sciences Beijing,100190,China Qing Ye China Center for Modernization Research Chinese Academy of Science Beijing,100190,China

multiple description coding is a source coding for multiple channels such that a decoder which receives an arbitrary subset of the channels may produce a useful reconstruction,which is one of useful methods for solving the problem of packet losses in network *** this paper,on the basis of multiwavelet transform,a new method of multiple description coding will be presented,and experiments show it works ***,a parametrization of one kind of multifiler banks,which generate multiwavelets with some good properties,will be given.

关键词： multiple description coding multiwavelet parametrization multifllter bank

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Wavelet-based unbalanced un-equivalent multiple description coding for P2P networks

Wavelet-based unbalanced un-equivalent multiple description ...

引用

IEEE International Conference on Telecommunications/IEEE Malaysia International Conference on Communications (ICT-MICC 2007)

作者： Firooz, Mohammad Hamed Ronasi, Keivan Pakravan, Mohammad Reza Avanaki, Alireza Nasiri Univ Tehran Sch Elect & Comp Engn Tehran Iran Sharif Univ Technol Dept Elect Engn Tehran Iran

ISBN: (纸本)9781424410934

Almost all existing multi-description coding (MDC) schemes are designed for media streaming over Internet. In this work, a wavelet-based video MDC technique is introduced that fits the criteria of media streaming over peer-to-peer networks. Our proposed method assigns descriptions to the senders due to their characteristic (Le. bandwidth and availability). In contrast to traditional MDC, different descriptions in the proposed method have different importance in remaking the original media. Our simulation results show considerable improvement of video quality at the receiver (up to 10 dB) as compared to the state-of-the-art.

关键词： hierarchical layered encoding multiple description coding Peer-to-Peer networks wavelet transform

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VIDEO STREAMING USING STANDARD-COMPATIBLE SCALABLE multiple description coding BASED ON SVC

VIDEO STREAMING USING STANDARD-COMPATIBLE SCALABLE MULTIPLE ...

引用

IEEE International Conference on Image Processing

作者： Zhao, Zhijie Ostermann, Joern Leibniz Univ Hannover Inst Informat Verarbeitung Hannover Germany

ISBN: (纸本)9781424479948

In this paper, a scalable multiple description video coding method based on the scalable video extension of H.264/AVC (SVC) is presented. The proposed scheme employs a standard SVC encoder to generate several bit streams which have different bit rates. The spatial enhancement layers of these bit streams are quantized in an unbalanced fashion, while the spatial base layers are coded with the same quantization step size. Balanced multiple scalable descriptions are generated by mixing the pre-encoded scalable bit streams. Each description alone is totally decodable by a standard SVC decoder. A preprocessor before a SVC decoder is employed to extract the packets from the highest quality bit stream. The experimental results show that our proposed scheme achieves improvements of 3.5dB and 3.9dB when compared to the methods based on spatial downspamling and temporal downsampling at 10% packet loss rate.

关键词： Video streaming SVC multiple description coding unbalanced quantization

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Bit-Erasure Channel Decoding for GMM-based multiple description coding

Bit-Erasure Channel Decoding for GMM-based Multiple Descript...

引用

Interspeech Conference 2007

作者： Agiomyrgiannakis, Yannis Stylianou, Yannis Univ Crete Dept Comp Sci Iraklion Greece

ISBN: (纸本)9781605603162

multiple description coding (MDC) is a plausible way to use the diversity of packet networks to increase the robustness of the transmission to packet losses. The redundancy that is introduced via MDC can also be used to increase the robustness of the transmission to bit-errors. This paper presents a novel decoding method for GMM (Gaussian Mixture Model)-based MDC in the presence of detected bit-errors. Particularly for speech transmission over bit-erasure channels, is is shown that the proposed method considerably improves the quality of the received speech spectral envelopes when one side-description is damaged. In highly correlated descriptions, for example, single and double bit-errors can almost be corrected.

关键词： multiple description coding Source/Channel coding bit-erasure channel decoding Speech coding Voice-over-IP

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H.264 multiple description coding based on redundant picture representation

H.264 multiple description coding based on redundant picture...

引用

IEEE International Conference on Image Processing (ICIP 2007)

作者： Tillo, Tammam Grangetto, Marco Olmo, Gabriella Politecn Torino Dipartimento Elettr I-10129 Turin Italy

ISBN: (纸本)9781424414369

In this paper a novel H.264 multiple description technique is proposed. The coding approach is based on the redundant slice representation option, defined in the H.264 standard. In presence of losses, the redundant representation can be used to replace missing portions of the compressed bitstream, thus yielding a certain degree of error resilience. This paper addresses the creation of two balanced descriptions based on the concept of redundant slices, while keeping full compatibility with the H.264 standard syntax and decoding behavior. Moreover, a practical algorithm for redundancy tuning as a function of the packet loss rate is provided. Experimental results demonstrate that the proposed technique favorably compares with other H.264 multiple description approaches.

关键词： multiple description coding H.264 redundant slices

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