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Improving the performance of multiple description coding based on scalar quantization

IEEE SIGNAL PROCESSING LETTERS 2008年 15卷 329-332页

作者： Tillo, Tammam Olmo, Gabriella Politecn Torino Dept Elect I-10129 Turin Italy

We propose an algorithm that improves the performance of rate-distortion-based multiple description coding (RD-MDC). The gain is particularly significant in the high redundancy region, where RD-MDC suffers a major performance penalty with respect to MDC bounds. The improvement is obtained with negligible additional computational cost, by exploiting the coarse information also at the central decoder. The proposed method can be generalized to all MDC schemes that use scalar quantization, without modifying the quantizer structure. This feature guarantees the generation of descriptions that can be decoded without any modification of the decoder.

关键词： JPEG2000 multiple description coding scalar quantization

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Supporting image and video applications in a multihop radio environment using path diversity and multiple description coding

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IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY 2002年第9期12卷 777-792页

作者： Gogate, N Chung, DM Panwar, SS Wang, Y Fujitsu Network Commun Pearl River NY 10965 USA New York City Dept Transportat Signal Div Long Isl City NY 11101 USA Polytech Inst New York Brooklyn NY 11201 USA

This paper examines the effectiveness of combining multiple description coding (MDC) and multiple path transport (MPT) for video and image transmission in a multihop mobile radio network. The video and image information is encoded nonhierarchically into multiple descriptions with the following objectives. The received picture quality should be acceptable, even if only one description is received and every additional received description contributes to enhanced picture quality. Typical applications will need a higher bandwidth/higher reliability connection than that provided by a single link in current mobile networks. For supporting these, applications, a mobile node may need to set up and use multiple paths to the desired destination, either simply because of the lack of raw bandwidth on a single channel or because of its poor error characteristics, which reduce its effective throughput. In the context of this work, the principal reasons for considering such an architecture are providing high bandwidth and more robust end-to-end connections. We describe a protocol architecture that addresses this need and, with the help of simulations, we demonstrate the feasibility of this system and compare the performance of the MDC-MPT scheme to a system using layered coding and asymmetrical paths for the base and enhancement layers.

关键词： error resilience multiple description coding path diversity video transport over wireless networks

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Quality-Adaptive Proxy Caching for Peer-to-Peer Video Streaming Using multiple description coding

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JOURNAL OF INFORMATION SCIENCE AND ENGINEERING 2009年第3期25卷 687-701页

作者： Ding, Jen-Wen Lan, Shi-Yuan Natl Kaohsiung Univ Appl Sci Dept Informat Management Kaohsiung 807 Taiwan

In the past few years, video streaming has been one of the most prominent applications in the Internet. There are basically two types of approaches to deliver on-demand video streams: infrastructure-based and infrastructure-less. The infrastructure-based approach, also known as the content delivery network (CDN) approach. employs numerous replicate servers and proxies to assist video streaming. The main drawback of this approach is that it is costly to deploy numerous servers and proxies. The infrastructure-less approach, also known as the peer-to-peer (P2P) approach, employs numerous peers to relay video streams. The main drawback of the P2P approach is its instability due to frequent joining/leaving of peers. The state-of-the-art development is to combine the two types of approaches. In this paper, we employ multiple description coding (MDC) to develop a novel P2P-assisted proxy caching scheme, called MP3, for on-demand video streaming. Our simulation results show that with the use of MDC, MP3 call effectively provide adaptive video quality for clients in a heterogeneous network environment.

关键词： adaptive video streaming peer-to-peer computing multimedia proxy cache replacement algorithm multiple description coding

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Filter Banks for Prediction-Compensated multiple description coding

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IEEE TRANSACTIONS ON SIGNAL PROCESSING 2009年第5期57卷 1756-1767页

作者： Wang, Jing Liang, Jie Simon Fraser Univ Sch Engn Sci Burnaby BC V5A 1S6 Canada

In this paper, a prediction-compensated multiple description (MD) coding framework for two-band filter banks is proposed, in which the coefficients in each subband are split into two descriptions. Each description also includes the prediction residuals of the data in the other description. The designs of the optimal orthogonal and biorthogonal filter banks are formulated in a unified framework, and both one-level and multiple-level decompositions are analyzed. Contrary to the existing MD filter banks in the literature, the optimal filter banks in the proposed scheme are quite similar to those in single description coding. Therefore, the method can be applied to systems with single-description-optimized filter banks and still attain near-optimal performance. Image coding results show that this method achieves better performance and lower complexity than the latest JPEG 2000 based MDC.

关键词： Filter bank image coding linear prediction multiple description coding wavelet transform

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Graded Quantization for multiple description coding of Compressive Measurements

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IEEE TRANSACTIONS ON COMMUNICATIONS 2015年第5期63卷 1648-1660页

作者： Valsesia, Diego Coluccia, Giulio Magli, Enrico Politecn Torino Dept Elect & Telecommun I-10129 Turin Italy

Compressed sensing (CS) is an emerging paradigm for acquisition of compressed representations of a sparse signal. Its low complexity is appealing for resource-constrained scenarios like sensor networks. However, such scenarios are often coupled with unreliable communication channels and providing robust transmission of the acquired data to a receiver is an issue. multiple description coding (MDC) effectively combats channel losses for systems without feedback, thus raising the interest in developing MDC methods explicitly designed for the CS framework, and exploiting its properties. We propose a method called Graded Quantization (CS-GQ) that leverages the democratic property of compressive measurements to effectively implement MDC, and we provide methods to optimize its performance. A novel decoding algorithm based on the alternating directions method of multipliers is derived to reconstruct signals from a limited number of received descriptions. Simulations are performed to assess the performance of CS-GQ against other methods in presence of packet losses. The proposed method is successful at providing robust coding of CS measurements and outperforms other schemes for the considered test metrics.

关键词： Compressed sensing multiple description coding quantization

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multiple description coding over multiple correlated erasure channels

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TRANSACTIONS ON EMERGING TELECOMMUNICATIONS TECHNOLOGIES 2012年第6期23卷 522-536页

作者： Zhao, Songqing Tuninetti, Daniela Ansari, Rashid Schonfeld, Dan Univ Illinois Dept Elect & Comp Engn Chicago IL 60607 USA

This paper examines the use of multiple description coding (MDC) for information transmission over multiple correlated erasure channels. It addresses the problem of optimal rate allocation between descriptions to attain the minimum possible average distortion at the receiver. The rate allocation problem is formulated on the basis of rate-distortion theory for the general case of unbalanced MDC and under the constraint that the total coding rate is fixed. The channel parameters, that is, erasure rates, for which MDC outperforms Single description coding are characterised. It is shown that MDC is optimal when the channel erasure rates are comparable and the total coding rate is large. A heuristic approximation for optimal rate allocation is also presented, which can be readily used in practice to determine the relative rates between descriptions needed to achieve the minimal average distortion. The relationship between the optimal average distortion and the erasure correlation is explored. It is shown that for some cases, such as for equal average erasure probabilities, the average distortion decreases as the channel correlation increases. Copyright (c) 2012 John Wiley & Sons, Ltd.

关键词： multiple description coding average end-to-end distortion erasure channel optimal rate allocation

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multiple description coding ghost imaging

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FRONTIERS IN PHYSICS 2023年 11卷

作者： Zhang, Yi Zhang, Yunhe Chang, Chen Sun, Shuai Liu, Weitao Natl Univ Def Technol Inst Quantum Sci & Technol Coll Sci Changsha Peoples R China Hunan Key Lab Mech & Technol Quantum Informat Changsha Peoples R China

Ghost imaging (GI) reveals its exceptional superiority over conventional cameras in a range of challenging scenarios such as weak illumination or special waveband. For high-performance GI, it is vital to obtain a sequence of high-fidelity bucket signals. However, measurements may suffer from distortion or loss in harsh environments. Here we present multiple description coding ghost imaging, which rests on illumination consisting of different coding patterns to address this challenge. Experimental results indicate that the proposed method is capable of producing satisfactory image even when the sequence of bucket signals is incomplete or highly distorted. This method provides an encouraging boost for GI in practical applications.

关键词： single-pixel imaging ghost imaging multiple description coding Fourier transform undersampling imaging

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Matching pursuits multiple description coding for wireless video

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IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY 2002年第6期12卷 566-575页

作者： Tang, XY Zakhor, A Oracle Corp Redwood Shores CA 94065 USA Univ Calif Berkeley Dept Elect Engn & Comp Sci Berkeley CA 94720 USA

multiple description coding (MDC) is an error-resilient source coding scheme that creates multiple bitstreams of approximately equal importance. The reconstructed signal based on any single bitstream has an acceptable quality. However, a higher quality reconstruction can be achieved with a larger number of bitstreams. We develop a multiple (2) description video coding scheme based on the three-loop structure originally proposed in [1]. We modify the discrete cosine transform structure to the matching pursuits framework and evaluate performance gain using maximum-likelihood (ML) enhancement when both descriptions are available. We find that ML enhancement works best for low motion sequences and results in gains of up to 1.3 dB in terms of average PSNR. Rate distortion performance is characterized. Performance comparison is made between our MDC scheme and single description coding (SDC) schemes over lossy channels, including two state Markov channels and Rayleigh fading channels. We find that MDC outperforms SDC in bursty slowly varying environments. In the case of Rayleigh fading channels, interleaving helps SDC close the gap and even outperform MDC depending on the amount of interleaving performed, at the expense of additional delay.

关键词： matching pursuits multiple description coding wireless video

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A Total Variation Based Approach for Composing Better Pictures in multiple description coding

A Total Variation Based Approach for Composing Better Pictur...

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Conference on Visual Communications and Image Processing (VCIP)

作者： Zhu, Shuyuan Zeng, Bing Hong Kong Univ Sci & Technol Dept Elect & Comp Engn Hong Kong Hong Kong Peoples R China

ISBN: (纸本)9780819482341

One of the important issues in multiple description coding (MDC) for image and video signals is to compose pictures of the "best" quality when more than one description is received at the decoder side. To this goal, a transform-domain overlapping technique combined with some necessary translations in the transform domain is proposed in the popular MDC schemes with staggered quantizers. However, the achievable gain is rather limited. In this paper, we formulate this enhancement problem as a total variation (TV) regularized optimization constrained by the knowledge of the quantization intervals of the DCT coefficients of each composed picture. In this TV-based approach, the transform-domain overlapping technique is used to find the more accurate quantization intervals in which the true DCT coefficients will fall while receiving more than one description. Simulation results demonstrate that such a TV-based enhancement yields a higher quality gain in both objective (e.g. PSNR-based) and subjective (i.e. visual perception) evaluations than using the transform-domain overlapping technique.

关键词： multiple description coding multiple description scalar quantization staggered quantizers total variation

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A Lower Bound on the Sum Rate of multiple description coding With Symmetric Distortion Constraints

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IEEE TRANSACTIONS ON INFORMATION THEORY 2014年第12期60卷 7547-7567页

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

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 erasure distortion measure or Hamming distortion measure, this lower bound can be evaluated with the aid of certain minimax theorems. 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： Erasure distortion Hamming distortion mean squared error minimax theorem multiple description coding saddle point

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