| 基于多层LDPC的分布式视频编码 |
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| 引用本文： | 巫戈明,孙立峰,钟玉琢.基于多层LDPC的分布式视频编码[J].小型微型计算机系统,2008,29(10). |
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| 作者姓名： | 巫戈明 孙立峰 钟玉琢 |
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| 作者单位： | 1. 清华大学,软件学院,北京,100084
2. 清华大学,计算机系,北京,100084 |
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| 基金项目： | 北京市自然科学基金，国家高技术研究发展计划(863计划) |
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| 摘 要： | 改进了基于多层低密度一致校验码(Multi-level LDPC)的分布式视频解码方法.逐层进行迭代译码,低层向高层传递译码软信息(似然比),迭代译码的内信息通过计算旁信息与码字之间欧氏距获得.相比传统的多级解码方式,提出的解码方式可以减少逐层硬判决带来的信息丢失,从而减小低层向高层的错误传播,更适合于视频数据的Syndrome编码.实验结果表明,该解码方式能提高分布式视频中多层码的解码成功率,从而提高编码效率.
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| 关 键 词： | 分布式视频编码 低密度一致校验码 多层码 |
Decoding Multilevel LDPC in Distributed Video Coding |
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| WU Ge-ming,SUN Li-feng,ZHONG Yu-zhuo.Decoding Multilevel LDPC in Distributed Video Coding[J].Mini-micro Systems,2008,29(10). |
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| Authors: | WU Ge-ming SUN Li-feng ZHONG Yu-zhuo |
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| Affiliation: | WU Ge-ming1,SUN Li-feng2,ZHONG Yu-zhuo21(School of Software,Tsinghua University,Beijing 100084,China)2(Departmen of Computer Science , Technology,China) |
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| Abstract: | An improved algorithm for decoding multilevel LDPC in distributed video coding(DVC)is presented.Multilevel LDPC is decoded level by level,and soft-decision results are passed from lower levels to higher levels.The intrinsic information is obtained by calculating the Euclidean distance between the side information and the candidate codewords.Passing soft-decision results can prevent error propagation,so it's more suitable for non-binary syndrome coding.The simulation results show that the proposed scheme can... |
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| Keywords: | distributed video coding(DVC) low-density parity-check(LDPC) multilevel codes(MLC) |
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