摘要
针对移动网络中低时延视频应用的诸多约束,提出了一种速率控制和容错编码相结合的H.264视频通信新方案.采用预编码阶段估计出的视频帧及其内部宏块对传输差错的敏感度,设计了自适应的帧级和宏块级目标比特分配方法.根据视频片(slice)中对差错敏感的宏块所占的百分比为其设置了重要性等级,采用Turbo码对不同重要性的片进行不均等差错保护(UEP).实验结果显示,此方案与传统的H.264速率控制与容错算法相比,在解码端可以获得超过1dB的亮度PSNR增益.
A joint H. 264 rate control and error resilience coding scheme is proposed to overcome constraints of low delay mobile video applications. The estimated transmission error sensitivity （ES） of the current frame and its contained macroblocks （MB） derived in pre-encoding stage are used to adaptively allocate target bits for frame and MB respectively. An importance level is set to each video slice based on the percentage of its contained high ES MBs, and an unequal error protection （UEP） with Turbo-codes is applied to slices based on their importance levels. Simulation shows that our scheme can obtain more than 1 dB luminance PSNR gain on average compared with the conventional H. 264 rate control and error resilience algorithms.
出处
《北京邮电大学学报》
EI
CAS
CSCD
北大核心
2008年第3期80-83,88,共5页
Journal of Beijing University of Posts and Telecommunications
关键词
视频编码
速率控制
容错编码
video coding
rate control
error resilience
