使用联合比特面译码的分布式视频编码  

A Distributed Video Coding Method Using Joint Bit-Planes Decoding Algorithm

作　　者：王尊亮[1] 李学明[1] 

机构地区：[1]北京邮电大学多媒体技术中心,北京100876

出　　处：《北京邮电大学学报》2010年第3期88-92,共5页Journal of Beijing University of Posts and Telecommunications

基　　金：北京市自然科学基金项目(4072019)

摘　　要：为了避免分布式视频编码(DVC)采用独立比特面译码存在的信源间相关性弱化,提出了一种联合比特面译码(JBPD)算法.该方法利用量化系数已解码比特平面的结果作为先验信息,对其他比特平面进行解码,避免了独立比特面解码时存在的信源间相关性弱化,更充分利用了Wyner-Ziv帧与关键帧间的相关性,可在不增加解码复杂度的情况下提升分布式视频编码的率失真性能.仿真结果表明,在其他环节相同时,采用联合比特面译码算法的分布式视频编码系统比采用独立比特面译码的系统比特率有较大降低,且随着量化级数的增多,性能提升更为明显.In order to avoid correlation weakening between sources when bit-planes are decoded independently in distributed video coding（DVC）,a joint bit-planes decoding（JBPD） algorithm is proposed.The JBPD algorithm uses the decoded bit-plane results as prior knowledge to decode other bitplanes to avoid correlation weakening between sources when bit-planes are decoded independently.The algorithm also makes full use of correlation between Wyner-Ziv frames and key frames.Therefore the ratedistortion performance of distributed video coding can be enhanced without increasing decoding complexity.Simulations indicate that,compared with the independent bit-planes decoding system,the proposed algorithm can achieve better bit-rate saving under the same condition,its performance improves more apparently with the increase of quantization levels.

关 键 词：分布式视频编码 联合比特面译码 低复杂度视频编码 分布式信源编码 

分 类 号：TN919.8[电子电信—通信与信息系统]