| 基于LDPC的码率自适应分布式视频编码 |
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| 引用本文： | 杨春玲,夏洪涛,张兴绍.基于LDPC的码率自适应分布式视频编码[J].中国图象图形学报,2010,15(12):1707-1713. |
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| 作者姓名： | 杨春玲 夏洪涛 张兴绍 |
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| 作者单位： | 华南理工大学电子与信息学院,华南理工大学电子与信息学院 |
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| 基金项目： | 国家自然科学基金项目(60972135)；中央高校基本科研业务费专项资金项目(2009ZM0231)；广东省自然科学基金项目(06025642)。 |
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| 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。
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| 关 键 词： | 分布式视频编码 低密度奇偶校验(LDPC)码 码率自适应 PEG算法 校验式 |
| 收稿时间： | 4/11/2009 7:46:35 PM |
| 修稿时间： | 8/6/2010 10:44:56 AM |
Rate adaptive distributed video coding based on LDPC |
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| Yang Chun Ling,Xia Hongtao and ZHANG Xingshao.Rate adaptive distributed video coding based on LDPC[J].Journal of Image and Graphics,2010,15(12):1707-1713. |
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| Authors: | Yang Chun Ling Xia Hongtao and ZHANG Xingshao |
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| Affiliation: | YANG Chunling1),XIA Hongtao1),2),ZHANG Xingshao1)1)(School of Electronic and Information Engineering,South China University of Technology,Guangzhou 510640)2)(China Unicom Co.,Ltd.Guangzhou Branch,Guangzhou 510630) |
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| 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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| Keywords: | distributed video coding(DVC) low density parity check(LDPC) rate-adaptive progressive edge-growth(PEG) algorithm syndrome |
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