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检索条件"主题词=Multiple description coding"

共 416 条记录，以下是91-100 订阅

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Wyner-Ziv Scheme Based multiple description coding for Robust Video Transmission over Path Diversity Networks 12

Wyner-Ziv Scheme Based Multiple Description Coding for Robus...

引用

12th International Conference on Advanced Technologies for Communications (ATC)

作者： Dinh Trieu Duong Univ Engn & Technol VNU Fac Elect & Telecommun Hanoi Vietnam

ISBN: (纸本)9781728123929

In this paper, we propose a novel multiple description coding method based on the Wyner-Ziv scheme for robust video transmission. In the proposed method, the motion vector (MV) field is encoded into two descriptions, which are transmitted over different paths to the decoder. Unlike the conventional methods, the correlation between descriptions in the proposed method is generated without using any additional redundant data since it can be estimated based on the high spatial correlation of MVs themselves in the MV field. At the decoder, this correlation is then employed as the side information in the Wyner-Ziv scheme to effectively improve the performance of the proposed method. Experimental results show that the proposed method can achieve a wide range of tradeoffs between coding efficiency and error resilience, and provide much better objective and subjective performance than other conventional MDC methods.

关键词： multiple description coding error resilience LDPC coding

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Real-time video delivery using peer-to-peer bartering networks and multiple description coding

Real-time video delivery using peer-to-peer bartering networ...

引用

IEEE International Conference on Systems, Man and Cybernetics

作者： Pouwelse, JA Taal, JR Lagendijk, RL Epema, DHJ Sips, HJ Delft Univ Technol Fac Elect Engn Math & Comp Sci Delft Netherlands

ISBN: (纸本)0780385667

Broadband Internet access using ADSL or cable modems provides sufficient bandwidth for real-time video streaming. If television channels could be distributed on the Internet, each channel would get a world wide audience. However television distribution from a single server does not scale and IP-level multicasting is complex and costly. We propose a solution based on application-level multicasting using a P2P network, called P2P-TV. Each peer receives a video stream and must also forward this stream to others. This paper presents an architecture for streaming video. Our P2P-TV proposal aims to solve three problems that are currently not addressed in other P2P streaming proposals, namely 1) maximizing the usage of all available peer bandwidth, 2) taking current network conditions into account (network awareness), and 3) the Freeriding problem. multiple description coding is an integral part of our solution. By splitting the video stream into smaller streams we can utilize all the bandwidth of a peer multiple streams allow more efficient adaptation of the multicast tree to current network conditions. Bittorrent-like bartering of content is also enabled by using multiple streams.

关键词： peer-to-peer television multicasting freeriding multiple description coding network awareness

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UNEQUAL LOSS-PROTECTED multiple description coding OF SCALABLE SOURCE STREAMS USING A PROGRESSIVE APPROACH

UNEQUAL LOSS-PROTECTED MULTIPLE DESCRIPTION CODING OF SCALAB...

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16th IEEE International Conference on Image Processing

作者： Ardestani, Majid R. Aminlou, Alireza Shirazi, Ali Asghar Beheshti Iran Univ Sci & Technol Dept Elect Engn Tehran Iran Univ Tehran Dept Elect & Comp Engn Tehran Iran

ISBN: (纸本)9781424456536

An analysis-based approach for unequal loss-protected multiple description coding (packetization) of the scalable (prioritized / progressive) source code streams is proposed. For a given number of packets (descriptions) of the known size, unequal loss-protected packetization leads to segment the scalable code stream, such that the source can be reconstructed with the maximum possible fidelity at the decoder side. Here, we find an analytical relation between optimal sizes of any two consecutive segments. This idea yields a low-complexity progressive solution with a performance close to that of local search [1], which has been approved as an efficient method to solve the segmentation problem. Simulation results are used to confirm the efficiency of the proposed method as compared with the local search algorithm.

关键词： Unequal loss-protected packetization multiple description coding scalable code stream joint source-channel coding

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Robust video communication by combining scalability and multiple description coding techniques

Robust video communication by combining scalability and mult...

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Conference on Image and Video Communications and Processing

作者： Wang, HS Ortega, A Univ So Calif Dept Elect Engn Syst Integrated Media Syst Ctr Los Angeles CA 90089 USA

ISBN: (纸本)0819448222

Layered coding (LC) and multiple description coding (MDC) have been proposed as two different kinds of "quality adaptation" schemes for video delivery over the current Internet or wireless networks. To combine the advantages of LC and MDC, we present a new approach - multiple description Layered coding (MDLC), to provide reliable video communication over a wider range of network scenarios and application requirements. MDLC improves LC in that it introduces redundancy in each layer so that the chance of receiving at least one description of base layer is greatly enhanced. Though LC and MDC are each good in limit cases (e.g., long end-to-end delay for LC vs. short delay for MDC), the proposed MDLC system can address intermediate cases as well. Same as a LC system with retransmission, the MDLC system can have a feedback channel to indicate which descriptions have been correctly received. Thus a low redundancy MDLC system can be implemented with our proposed runtime packet scheduling system based on the feedback information. The goal of our scheduling algorithm is to find a proper on-line packet scheduling policy to maximize the playback quality at the decoder. Previous work on scheduling algorithms has not considered multiple decoding choices due to the redundancy between data units, because of the increase in complexity involved in considering alternate decoding paths. In this paper, we introduce a new model of Directed Acyclic HyperGraph (DAHG) to represent the data dependencies among frames and layers, as well as the data correlation between descriptions. The impact of each data unit to others is represented by messages passing along the graph with updates based on new information received. Experimental results show that the proposed system provides more robust and efficient video communication for real-time applications over lossy packet networks.

关键词： multimedia communication layered coding multiple description coding multiple description layered coding scheduling

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A HIGH VIDEO QUALITY multiple description coding SCHEME FOR LOSSY CHANNELS

A HIGH VIDEO QUALITY MULTIPLE DESCRIPTION CODING SCHEME FOR ...

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IEEE International Conference on Multimedia and Expo (ICME)

作者： Kazemi, Mohammad Sadeghi, Khosrow Shirmohammadi, Shervin Sharif Univ Technol Tehran Iran Univ Ottawa Sch Informat Technol & Engn Distributed & Collaborat Virtual Environm Res Lab Ottawa ON Canada

ISBN: (纸本)9781612843490

multiple description coding (MDC) is a technique where multiple streams from a source are generated, each individually decodable and mutually refinable. In this paper, a new Mixed Layer MDC (MLMDC) scheme is presented which achieves a higher side quality compared to conventional MDCs. The improved side performance leads to higher average video quality at the receiver in lossy networks. For each DCT coefficient, we generate two coefficients: Base Coefficient (BC) and Enhancement Coefficient (EC) which are combined together. When all descriptions are available, they are decomposed and decoded to achieve high quality video. When one description is not available, we use estimation to extract as much of the BC as possible from the received description. The algorithm is implemented in JM16.0 and its performance for two-description and four-description coding is verified by experiments.

关键词： Video coding Video Transmission multiple description coding Redundancy-Rate-Distortion Video Packet Loss Mitigation

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Error resilient image communication using content-based multiple description coding

Error resilient image communication using content-based mult...

引用

3rd International Conference on Information Technology: coding and Computing (ITCC 2002)

作者： Shirani, S McMaster Univ Dept Elect & Comp Engn Hamilton ON Canada

ISBN: (纸本)076951507X

multiple description coding has been studied as an approach for transmission of images over error Prone environments. The multiple description coding method proposed here takes into account the content of the image and provides the least amount of degradation, caused by loss of descriptors, for those areas of the image which are of greater interest. This is achieved by employing a non-linear geometrical transform to odd redundancy mainly to the area of interest followed by a partitioning of the nonlinearly transformed image into sub-images which are coded and transmitted over separate channels, Simulations show that this approach yields exceptional performance even when only one descriptor is received. Moreover, the method proposed here can be implemented through pre- and post-processing of the image data, without modification to the source codecs (e.g., JPEG).

关键词： multiple description coding error resilience coding source/channel coding image communication content-based image processing

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Scalable multiple description coding of video using motion compensated temporal filtering and embedded multiple description scalar quantization

Scalable multiple description coding of video using motion c...

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Conference on Wavelet Applications in Industrial Processing II

作者： Verdicchio, F Munteanu, A Gavrilescu, A Cornelis, J Schelkens, P Free Univ Brussels Interdisciplinary Inst Broadband Technol IBBT Dept Elect & Informat Proc ETRO B-1050 Brussels Belgium

ISBN: (纸本)0819455601

Real time delivery of video over best-effort and error-prone networks requires compression systems that dynamically adapt the rate to the available channel capacity and exhibit robustness to loss of some data as retransmission is often impractical. Error resiliency, however, significantly lowers the coding performance when rigid design is performed based on a worst-case scenario. This paper presents a scalable video coding scheme that couples the compression efficiency of the open-loop architecture with the robustness of multiple description source coding. The use of embedded multiple description quantization and a novel channel-aware rate-allocation allows for shaping on-the fly the output bit-rate and the degree of resiliency without resorting to channel coding. As a result, robustness to data losses is traded for better visual quality when transmission occurs over reliable channels, while error resilience is introduced when noisy links are involved. The advantage of our proposal is demonstrated in the context of packet-lossy networks comparing the performance of similar instantiations of the video codec employing non-scalable redundancy.

关键词： robust source coding multiple description coding error resilience scalable video coding

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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 ...

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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...

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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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