A Kind of Distributed Video Compression Scheme Based on Rateless Low-Density Parity-Check Codes

CAI Shu-ting; WANG Qin-ruo; XIE Yun; YIN Ming

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A Kind of Distributed Video Compression Scheme Based on Rateless Low-Density Parity-Check Codes

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- A Kind of Distributed Video Compression Scheme Based on Rateless Low-Density Parity-Check Codes
- Acta Electronica Sinica Vol. 37, Issue 11, Pages: 2535-2540(2009)
- 作者机构：
  
  1. 广东工业大学自动化学院,广东,广州,510006
  2. 东南大学信息科学与技术学院,江苏,南京,210096
  3. 广东工业大学自动化学院广东广州,510006
  4. 东南大学信息科学与技术学院江苏南京,210096
- 作者简介：
- 基金信息：
- DOI：
  CLC： TN919.82
- Published：2009
- 稿件说明：
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CAI Shu-ting, WANG Qin-ruo, XIE Yun, et al. A Kind of Distributed Video Compression Scheme Based on Rateless Low-Density Parity-Check Codes[J]. Acta Electronica Sinica, 2009, 37(11): 2535-2540.
DOI：

CAI Shu-ting, WANG Qin-ruo, XIE Yun, et al. A Kind of Distributed Video Compression Scheme Based on Rateless Low-Density Parity-Check Codes[J]. Acta Electronica Sinica, 2009, 37(11): 2535-2540. DOI：

摘要

针对固定码率LDPC码进行视频压缩时存在自适应能力差的问题

提出了一种基于无比率LDPC编码的Wyner-Ziv视频压缩机制.算法的主要思想是对部分变量节点调整删余比率以达到码率自适应的目的.同时采用一种新的在编码端进行码率估计的方法

克服了当前分布式编码码率调整需要反馈通道的问题

并为无比率LDPC编码设计多种编码模式提供了保障.实验结果表明

相对于LDPCA编码

提出的编码机制提升了系统率失真性能大约1-2dB

相对Motion-oracle算法解码复杂度要低2个数量级.

Abstract

To overcome the poor adaptive ability of the fixed-rate Low-Density Parity-Check (LDPC) codes when applied to video compression

a kind of distributed video compression scheme based on rateless LDPC is proposed.The main idea of the algorithm is that part of variable node is punctured to adjust the puncturing ratio for rate adaptive ability.A novel rate estimation method is also proposed in encoder

it can solve the problem of needing the feedback channel for rate control in distributed video coding currently

and supply the rateless LDPC to design multiple code mode.Experiments results show that proposed scheme access the 1-2dB gain of rate distortion (RD) compared with rate-adaptive LDPC Accumulate (LDPCA) codes.The decoder complexity magnitude of proposed scheme is 2 orders less than the motion-oracle algorithm.

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