Rate adaptive distributed video coding based on LDPC

Yang Chun Ling; Xia Hongtao; ZHANG Xingshao

doi:10.11834/jig.20101214

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Rate adaptive distributed video coding based on LDPC
Vol. 15, Issue 12, Pages: 1707(2010)
Published Online：13 December 2010，

Published：2010
DOI： 10.11834/jig.20101214
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DOI：

Yang Chun Ling, Xia Hongtao, ZHANG Xingshao. Rate adaptive distributed video coding based on LDPC[J]. Journal of Image and Graphics, 2010, 15(12): 1707. DOI： 10.11834/jig.20101214.

摘要

为了在分布式视频编码（DVC）中取得更好的压缩性能，将校验节点的合并和分裂进行有机结合，提出了一种码率自适应LDPC（RALDPC）编码新方法。该方法首先基于PEG算法构造高压缩比LDPC码字；然后由行均匀分裂得到低压缩比码字；最后通过合并或分裂校验矩阵对应的行来适度调整码率。为保证码字性能，还提出了校验节点合并的3个限制条件，并基于RALDPC提出了一种码率自适应DVC编码方案。实验结果表明，与当前基于Turbo码的DVC方案相比，在原信息和边信息高度或中度相关时，编码性能提高了0.1～0.7dB。

Abstract

In order to achieve better rate distortion (RD) performance in distributed video coding (DVC)

a new rateadaptive low density parity check (RALDPC) coding algorithm is proposed. Firstly

a high compression ratio code is constructed based on progressive edge-growth (PEG) algorithm. Then low compression ratio codes are obtained using row splitting algorithm. The rate can be well adjusted by merging and splitting the parity-check matrix rows. And three restriction conditions for merging check nodes are proposed in order to obtain good performance codes. Based on the RALDPC

a rate adaptive DVC algorithm is proposed

which can achieve better RD performance about 0.1~0.7dB compared to DVC algorithm based on the popular Turbo codes

when the correlation between the original and side information is medium or high.

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Research on Distributed Video Coding

Error protection for key frames in distributed video coding