| 一种基于无比率LDPC编码的分布式视频压缩机制 |
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| 引用本文： | 蔡述庭,王钦若,谢云,尹明. 一种基于无比率LDPC编码的分布式视频压缩机制[J]. 电子学报, 2009, 37(11): 2535-2540 |
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| 作者姓名： | 蔡述庭 王钦若 谢云 尹明 |
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| 作者单位： | 广东工业大学自动化学院,广东广州,510006;东南大学信息科学与技术学院,江苏南京,210096;广东工业大学自动化学院,广东广州,510006 |
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| 基金项目： | 广东省自然科学基金研究团队，广东工业大学青年基金 |
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| 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.
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| 关 键 词： | 无比率LDPC 码率控制 Wyner-Ziv编码 删余码 |
| 收稿时间： | 2008-10-28 |
A Kind of Distributed Video Compression Scheme Based on Rateless Low-Density Parity-Check Codes |
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| CAI Shu-ting,WANG Qin-ruo,XIE Yun,YIN Ming. A Kind of Distributed Video Compression Scheme Based on Rateless Low-Density Parity-Check Codes[J]. Acta Electronica Sinica, 2009, 37(11): 2535-2540 |
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| Authors: | CAI Shu-ting WANG Qin-ruo XIE Yun YIN Ming |
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| Affiliation: | CAI Shu-ting1,2,WANG Qin-ruo1,XIE Yun1,YIN Ming1(1.Faculty of Automation,Guangdong University of Technology,Guangzhou,Guangdong 510006,China,2.School of Information Science and Engineering,Southeast University,Nanjing,Jiangsu 210096,China) |
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| 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,a... |
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| Keywords: | rateless low-density parity-check rate control wyner-ziv code punctured code |
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