精细的可伸缩性视频编码中容错技术的研究

 精细的可伸缩性视频编码生成的增强层码流在有误码的信道中传输时,正确解码的比特数由信道误码率决定,而不是由信道带宽决定,这将严重影响图像质量.本文提出了一种新的分级的增强层码流结构,在这种新的增强层码流中加入各种同步符,将码流分为许多不同的段.当码流在传输过程中出现错误时,只有发生错误的那段码流不能解码,从而有效地减少了传输错误的影响.在MPEG-4的FGS上的实验结果表明我们提出的增强层码流结构比原来的FGS增强层码流结构有更好的鲁棒性.

Error Resilience Methods for FGS Coding Scheme

In the FGS (Fine Granularity Scalability) enhancement bitstream,the error resilient technique are not considered. when delivering video bitstream over error prone channel,the actual decoded bits are only a small part of received data due to the transmitted errors even if a great deal of enhancement bitstream is transmitted to the decoder. In this paper,a new architecture of enhancement layer bitstream with resynchronization markers and Header Extension Code (HEC) is proposed for efficient error localization and recovery. Experimental results show that,at the same channel conditions,the proposed enhancement bitstream is more robust than that of the original enhancement bitstream in MPEG 4 standard.