基于时空冗余及不等错误保护的分布式多视点视频编码容错传输  

Error Resilient Transmission for Tistributed Multi-view Video Coding Based on Spatial-temporal Redundancy and Unequal Error Protection

作　　者：熊珊珊 卿粼波[1] 陈真真[1,2] 杨红 何小海[1] XIONG Shan-shan;QING Lin-bo;CHEN Zhen-zhen;YANG Hong;HE Xiao-hai(School of Electronic Information Engineering,Sichuan Univ,Chengdu 610065,China;H3C Big Data Technology Co.Ltd.,Zhengzhou 450000,China)

机构地区：[1]四川大学电子信息学院,成都610065 [2]新华三大数据技术有限公司,郑州450000

出　　处：《科学技术与工程》2018年第29期84-90,共7页Science Technology and Engineering

基　　金：四川大学优秀青年学者基金(2015SCU04A11);国家自然科学基金(61471248)资助

摘　　要：在分布式多视点视频编码(distributed multi-view video coding,DMVC)数据传输过程中,编码方式不同导致K帧与WZ帧受信道误码影响也不相同,因此提出了一种DMVC整体容错传输框架,针对K帧及WZ帧特性设计了不同的容错保护传输方案并进行有效融合。针对K帧的容错传输问题,首先根据左、右相邻视点的对应K帧,利用DIBR算法产生的空间边信息对丢失块进行初始修复;然后根据K帧同一视点内的相邻已解码帧,生成它的时间参考帧,对K帧的丢失块进行重修复。针对WZ帧的容错传输问题,提出了基于不等错误保护(unequal error protection,UEP)的编码算法,根据不同频带的各个比特面的重要性不同,对低频带、高比特面进行更加合理的码率分配,在不增加编码端复杂度的前提下提高了WZ帧的误码容错性能。实验结果表明:在K帧和WZ帧均出现丢包的情况下(丢包率为5%～15%),相比K帧采用传统的帧内错误隐藏加WZ帧采用参考文献码率的算法,本文方案对视频序列重建图像的BD-PSNR平均提升了2.39～4.68 d B,且随着丢包率的增加,提升效果更加显著。In the typical DMVC system,the different coding scheme results in different error influence to transmission error in wireless channel for K frames and WZ frames.A new error resilient DMVC coding scheme is proposed for better error resilience,in which different coding methods are designed specifically for K frame and WZ frame.For K frames,firstly,the losing blocks led by transmission error are initially repaired with the spatial side information of adjacent viewpoints applying DIBR algorithm.Then,the spatial side information for decoded K frame is generated based on the adjacent decoded WZ frames in the same view.For WZ frames on the other hand,a new coding scheme based on UEP is designed,a new rate allocation algorithm regarding the different level of significance for different frequency bands,bitplanes is proposed.As a result the robustness of WZ frames is improved without increasing the complexity of the encoder.Experimental results show that the error resilience performance have been improved significantly for both the K frames and WZ frames.More specifically,compared with conventional error concealment algorithms for K frames and rate allocation algorithms for WZ frame,the BD-PSNR for different video sequences can be improved from 2.39 to 4.68 dB,at the packet loss ratio of transmission from 5%~15%.In the meantime,the higher of the channel error,the more improvement can be achieved.

关 键 词：分布式视频编码 多视点视频编码 容错传输 不等错误保护 

分 类 号：TN919.8[电子电信—通信与信息系统]