摘要： 针对差错信道下视频信源的不等差错保护问题，设计一个新的信道码码率分配策略，对一个图片组中不同位置的帧给予不同强度的保护。该策略考虑了视频信源的误码扩散问题，分析了差错掩盖方法与信道失真计算的关系，通过在编码端有效估计信道差错所引入的失真并建立最优码率分配问题，利用遗传算法快速得到最优的信道码码率分配方案。实验采用H.264视频编码标准，结果证明该策略能较好地提升视频传输系统性能。

关键词: 不等差错保护, H.264/AVC标准, 遗传算法, RS码, 率失真

Abstract: This paper analyzes the Unequal Error Protection(UEP) problem of video via error channel and describes a novel channel code rate allocation scheme, which discriminates frames in a Group Of Pictures(GOP) and provides different intensity of protection. The system takes into account the error propagation problem of video and the error concealment method used by the decoder to estimate the distortion introduced by channel error and formulates the optimal rate allocation problem. After that, genetic algorithm is utilized to solve the problem and gets the optimal result. Experiments with H.264/AVC video compression standard show that the method effectively improves the performance of the system.

Key words: Unequal Error Protection(UEP), H.264/AVC, genetic algorithm, Reed Solomon(RS) code, rate distortion

中图分类号: 

• TP301.6