考虑视频内容的H.265/HEVC帧层码率分配算法  

H.265/HEVC frame-level bitrate allocation algorithm considering video content

作　　者：李维[1] 杨付正[2] 任鹏[2] 

机构地区：[1]西安理工大学印刷包装与数字媒体学院,陕西西安710048 [2]西安电子科技大学通信工程学院,陕西西安710071

出　　处：《通信学报》2015年第9期76-81,共6页Journal on Communications

基　　金：国家自然科学基金资助项目(61371089;61072102);高等学校学科创新引智计划基金资助项目(B08038);校科研启动基金资助项目(108-256211407)~~

摘　　要：为了保证一定视频质量下编码器输出的码率符合给定的目标码率,提出一种考虑视频内容特性的H.265/HEVC帧层码率分配算法。首先从率失真理论分析的角度推导出影响输出码率的主要因素,然后根据视频编码原理,预测出帧内容复杂度参数,从而建立一种更有效的帧层码率分配算法。实验结果表明,所提算法可以使帧层目标码率与编码码率保持更好的一致性,且重构视频质量平均提高了0.103 d B。In order to guarantee the consistency between the coded bits and target bits, a frame-level bitrate allocation algorithm considering the content feature was proposed for H.265/HEVC codec. The main factors to affect the output bitrate were first discussed by the analysis of rate-distortion theory. According to the video coding principle, the related parameter was then predicted to reflect the content complexity. Finally, an efficient frame-level bitrate allocation algorithm was constructed. Experimental results show that the target bits and coded bits keep a better consistency, and the reconstruction video quality is improved by 0.103 d B in average.

关 键 词：码率分配 内容特性 速率控制 H.265/HEVC 

分 类 号：TN911.72[电子电信—通信与信息系统]