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检索条件"主题词=multiple description coding"

共 417 条记录，以下是351-360 订阅

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Fair rate allocation of scalable multiple description video for many clients

Fair rate allocation of scalable multiple description video ...

引用

Conference on Visual Communications and Image Processing 2005

作者： Taal, JR Lagendijk, RIL Delft Univ Technol Informat & Commun Theory Grp Fac Elect Engn Math & Comp Sci NL-2600 AA Delft Netherlands

ISBN: (纸本)0819459763

dPeer-to-peer networks (P2P) form a distributed communication infrastructure that is particularly well matched to video streaming using multiple description coding. We form M descriptions using MDC-FEC building on a scalable version of the "Dirac" video coder. The M descriptions are streamed via M different application layer multicast (ALM) trees embedded in the P2P network. Client nodes (peers in the network) receive a number of descriptions m < M that is dependent on their bandwidth. In this paper we consider the optimization of the received video qualities, taking into account the distribution of the clients' bandwidth. We propose three "fairness" criteria to define the criterion to be optimized. Numerical results illustrate the effects of the different fairness criteria and client bandwidth distributions on the rates allocated to the compressed video layers and multiple descriptions.

关键词： multiple description coding scalable coding erasure codes peer-to-peer networks error resilience path diversity

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Distribution Preserving Quantization

Distribution Preserving Quantization

引用

作者： Minyue Li KTH Royal Institute of Technology

学位级别：博士

In the lossy coding of perceptually relevant signals, such as sound and im- ages, the ultimate goal is to achieve good perceived quality of the recon- structed signal, under a constraint on the bit-rate. Conventional method- ologies focus either on a rate-distortion optimization or on the preservation of signal features. Technologies resulting from these two perspectives are efficient only for high-rate or low-rate scenarios. In this dissertation, a new objective is proposed: to seek the optimal rate-distortion trade-off under a constraint that statistical properties of the reconstruction are similar to those of the source. The new objective leads to a new quantization concept: distribution preserving quantization (DPQ). DPQ preserves the probability distribution of the source by stochastically switching among an ensemble of quantizers. At low rates, DPQ exhibits a synthesis nature, resembling existing cod- ing methods that preserve signal features. Compared with rate-distortion optimized quantization, DPQ yields some rate-distortion performance for perceptual benefits. The rate-distortion optimization for DPQ facilitates mathematical anal- ysis. The dissertation defines a distribution preserving rate-distortion func- tion (DP-RDF), which serves as a lower bound on the rate of any DPQ method for a given distortion. For a large range of sources and distortion measures, the DP-RDF approaches the classic rate-distortion function with increasing rate. This suggests that, at high rates, an optimal DPQ can ap- proach conventional quantization in terms of rate-distortion characteristics. After verifying the perceptual advantages of DPQ with a rela- tively simple realization, this dissertation focuses on a method called transformation-based DPQ, which is based on dithered quantization and a non-linear transformation. Asymptotically, with increasing dimensional- ity, a transformation-based DPQ achieves the DP-RDF for i. i. d. Gaussian sources and the mean squared error (MSE)

关键词： lossy source coding perceived quality perceptual coding rate-distortion function quantization synthesis distribution preserving quantization distribution preserving rate-distortion function multiple description coding entropy coding

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Lost Label Prediction Algorithm for Three description Lattice Vector Quantization System

Lost Label Prediction Algorithm for Three Description Lattic...

引用

IEEE Region 10 Conference (TENCON)

作者： Teo, Hui Ting Salleh, Mohd Fadzli Mohd Univ Sains Malaysia Sch Elect & Elect Engn Nibong Tebal 14300 Pulau Pinang Malaysia

ISBN: (纸本)9781509025978

Multimedia communication system design encounters great challenges in network congestion and delay sensibility issues. multiple description coding system has recently emerged as a desirable framework for robust multimedia data transmission over the unreliable channels. This paper presents a prediction method of a lost label during transmission called lost label prediction algorithm in order to improve performance of side decoders when there always two of the three channels successfully transmitting the data. The lost label is predicted by putting on the nearest sublattice point between the two available labels. Simulation results show that the improved three descriptions lattice vector quantization system provides lower distortion and better reconstruction quality.

关键词： multiple description coding lattice vector quantization labeling function

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Polar coding for multiple descriptions Using Monotone Chain Rules 55

Polar Coding for Multiple Descriptions Using Monotone Chain ...

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55th Annual Allerton Conference on Communication, Control, and Computing (Allerton)

作者： Bhatt, Alankrita Ghaddar, Nadim Wang, Lele Univ Calif San Diego Elect & Comp Engn La Jolla CA 92093 USA Stanford Univ Elect Engn Stanford CA 94305 USA Tel Aviv Univ Tel Aviv Israel

In this paper, we present a polar coding scheme for the multiple description coding problem. The proposed scheme improves upon the existing joint polarization based scheme by Shi, Song, Tian, Chen, and Dumitrescu and ... 详细信息

ISBN: (纸本)9781538632666

关键词： Polar codes multiple description coding El Gamal-Cover inner bound Monotone chain rules

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A partially reliable transport protocol for multiple-description real-time multimedia traffic

A partially reliable transport protocol for multiple-descrip...

引用

IEEE International Conference on Image Processing (ICIP 2006)

作者： Rossi, Claudio Casetti, Claudio Fiore, Marco Schonfeld, Dan Politecn Torino Dipartimento Elettron Turin Italy Univ Illinois ECE Dept Chicago IL USA

ISBN: (纸本)9781424404810

multiple description coding (MDC) combined with multipath transmission is a viable solution to the growing demand of reliable multimedia video communication over the Internet. Despite the progress in MDC techniques, transport protocols based on TCP cannot efficiently handle multipath transmissions of this kind of traffic. In this paper we present MD-SCTP, a full-multipath partially-reliable SCTP-based protocol, providing different scheduling schemes and featuring a selective retransmission within time-to-delivery constraints of multimedia traffic. Performance analysis proves the validity of our scheduler and of our selective retransmission scheme.

关键词： transport protocols multiple description coding scheduling

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Coded Caching with Uneven Channels: A Quality of Experience Approach 21

Coded Caching with Uneven Channels: A Quality of Experience ...

引用

21st IEEE International Workshop on Signal Processing Advances in Wireless Communications (IEEE SPAWC)

作者： Salehi, MohammadJavad Tolli, Antti Shariatpanahi, Seyed Pooya Univ Oulu Ctr Wireless Commun CWC Oulu 90570 Finland Univ Tehran Coll Engn Sch Elect & Comp Engn Tehran Iran

ISBN: (纸本)9781728154787

The rate performance of wireless coded caching schemes is typically limited by the lowest achievable per-user rate in the given multicast group, during each transmission time slot. In this paper, we provide a new coded caching scheme, alleviating this worst-user effect for the prominent case of multimedia applications. In our scheme, instead of maximizing the symmetric rate among all served users, we maximize the total quality of experience (QoE);where QoE at each user is defined as the video quality perceived by that user. We show the new scheme requires solving an NP-hard optimization problem. Thus, we provide two heuristic algorithms to solve it in an approximate manner;and numerically demonstrate the near-optimality of the proposed approximations. Our approach allows flexible allocation of distinct video quality for each user, making wireless coded caching schemes more suitable for real-world implementations.

关键词： Coded caching uneven channels quality of experience multiple description coding

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Error Resilient Transmission for Block Compressed Sensing of Color Images 7

Error Resilient Transmission for Block Compressed Sensing of...

引用

IEEE 7th Global Conference on Consumer Electronics (GCCE)

作者： Huang, Yen-Chieh Chen, Po-Liang Chang, Feng-Cheng Huang, Hsiang-Cheh Natl Feng Shan Senior High Sch Kaohsiung Taiwan Natl Univ Kaohsiung Kaohsiung Taiwan Tamkang Univ New Taipei Taiwan

ISBN: (纸本)9781538663097

Block compressed sensing (BCS) is a new research branch in compressed sensing, which is famous for its superior performances. Evaluations between compression and reconstructed quality are based on the error- free transmission, and we look for the error resilient transmission of BCS over lossy channels. We propose to employ multiple description coding (MDC) to protect the BCS coefficients at the encoder. Then, protected coefficients are ready for transmitting over multiple lossy channels. Finally, we apply the capability of MDC and the high correlations between color planes for image reconstruction. Simulations have presented the enhancements of protected image qualities for the proposed algorithm.

关键词： block compressed sensing multiple description coding error resilience lossy channels

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A Novel Layered Error Resilient Method for SPIHT-Coded Images over Packet Networks

A Novel Layered Error Resilient Method for SPIHT-Coded Image...

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International Conference on Industry, Information System and Material Engineering

作者： Sun, WenZhu Wang, HongYu Wang, Jie Dalian Univ Technol Fac Elect Informat & Elect Engn Dalian 116023 Peoples R China

ISBN: (纸本)9783037850275

This paper presents a layered error resilient scheme for Set Partitioning in Hierarchical Trees (SPIHT) coding which incorporates the multiple description coding (MDC) into the data partition. The major feature of this scheme is that the MDC is adopted in the process of packetizing the spatial orientation trees, so as to protect the important information bits according to different importance and channel state. The proposed scheme can allocate redundancy accurately and flexibly, by differentiating importance of bits through different bit planes. Experimental results show that the proposed method achieves good performance over packet erasure channels.

关键词： Error-resilience multiple description coding bit plane coding set partitioning in hierarchical trees (SPIHT) joint source-channel coding

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multiple description multi-watermarking with tabu search approaches

Multiple description multi-watermarking with tabu search app...

引用

Conference on Visual Communications and Image Processing 2005

作者： Pan, JS Huang, CY Huang, HC Liao, BY Huang, KC Natl Kaohsiung Univ Appl Sci Kaohsiung 807 Taiwan

ISBN: (纸本)0819459763

Digital watermarking is one of the useful solutions for digital rights management systems, and it is also a popular research topic in the last decade. However, most watermarking related literature focus on how to resist intentional attacks by applying benchmarks to watermarked media to estimate the effectiveness of the watermarking algorithm. Only a few papers concentrate on the error resilient transmission of watermarked media. In this paper, we propose an innovative algorithm on vector quantization (VQ) based image watermarking, suitable for error-resilient transmission over noisy channels. By incorporating watermarking with multiple description coding (MDC), our proposed schemes for embedding multiple watermarks can efficiently overcome channel impairments while retaining the capability for copyright and ownership protection. In addition, we employ one optimization technique, called tabu search, to optimize both the watermarked image quality, and the robustness of the extracted watermarks. Simulations demonstrate the utility and practicability of our proposed algorithm.

关键词： watermarking error resilience multiple description coding vector quantization tabu search

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GRADED QUANTIZATION: DEMOCRACY FOR multiple descriptionS IN COMPRESSED SENSING

GRADED QUANTIZATION: DEMOCRACY FOR MULTIPLE DESCRIPTIONS IN ...

引用

IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： Valsesia, Diego Coluccia, Giulio Magli, Enrico Politecn Torino Italy Dipartimento Elettron & Telecomunicaz Turin Italy

ISBN: (纸本)9781479903566

The compressed sensing paradigm allows to efficiently represent sparse signals by means of their linear measurements. However, the problem of transmitting these measurements to a receiver over a channel potentially prone to packet losses has received little attention so far. In this paper, we propose novel methods to generate multiple descriptions from compressed sensing measurements to increase the robustness over unreliable channels. In particular, we exploit the democracy property of compressive measurements to generate descriptions in a simple manner by partitioning the measurement vector and properly allocating bit-rate, outperforming classical methods like the multiple description scalar quantizer. In addition, we propose a modified version of the Basis Pursuit Denoising recovery procedure that is specifically tailored to the proposed methods. Experimental results show significant performance gains with respect to existing methods.

关键词： Compressed sensing multiple description coding error resilience

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