基于层修复技术的DVC鲁棒传输框架  

The robust transmission scheme of Distributed Video Coding based on the repair layer

作　　者：杨红[1] 卿粼波[1] 何小海[1] 王林[1] 丁灏雲 YANG Hong;QING Linbo;HE Xiaohai;WANG Lin;DING Haoyun(College of Electronics and Information Engineering,Sichuan University,Chengdu Sichuan 610065,China)

机构地区：[1]四川大学电子信息学院,四川成都610065

出　　处：《太赫兹科学与电子信息学报》2023年第1期82-87,共6页Journal of Terahertz Science and Electronic Information Technology

基　　金：国家自然科学基金资助项目(61871278);国家军工委资助项目(2019-JCJQ-JJ-406)。

摘　　要：针对分布式视频编码(DVC)系统鲁棒传输问题,设计了一种基于层修复的DVC系统传输框架。该传输框架首先对关键帧(K帧)同时采用高效视频编码(HEVC)帧内编码和Wyner-Ziv编码,并将校验信息(Wyner-Ziv码流)作为修复层码流存入缓存中。若当前关键帧有丢失,则向编码端请求该帧对应的层修复码流,在解码端对错误块进行修复,获得关键帧解码质量的提升。同时,研究了层修复码率估计算法,利用已成功解码的位平面辅助完成算法重建。实验结果表明,该传输框架利用关键帧的层修复码流对关键帧失真部分进行了修复,提高了关键帧质量,改善了边信息质量,实现了DVC的鲁棒传输。Aiming at the problem of robust transmission in Distributed Video Coding(DVC)system,a DVC system transmission framework based on layer restoration is designed.Firstly,this transmission framework uses the High Efficiency Video Coding(HEVC)frame encoding and Wyner-Ziv coding to encode Key frames(K frames)respectively,and the checking information(Wyner-Ziv codes)is stored in the cache as a layer repair code stream.If the current Key frame is lost,the corresponding layer repair code stream of the frame is requested at the encoding end,and the error block is repaired at the decoder end to obtain the improvement of Key frame decoding quality.At the same time,the algorithm of layer repair coding rate estimation is also studied and the successfully decoded bit plane is employed to complete the algorithm reconstruction.The experimental results show that the transmission framework takes advantage of layer repair code stream of Key frame to repair the distortion part of Key frame.The qualities of Key frame and side information are improved(for example,when the"Kendo"sequence is lost by 5%,the Peak Signal-to-Noise Ratio(PSNR)is increased by 3.5 dB at the bit rate of 1000 kbps),so as to realize the robust transmission of distributed video coding system.

关 键 词：分布式视频编码 WYNER-ZIV编码 关键帧 鲁棒传输 修复层 

分 类 号：TN919.3[电子电信—通信与信息系统]