基于可伸缩视频编码Hierarchical-B结构的恒定质量控制  

Constant Quality Control for Hierarchical-B Structure in Scalable Video Coding

作　　者：谈永敏[1,2] 杨小康[1,2] 宋利[1,2] 

机构地区：[1]上海交通大学电子工程系图像通信与信息处理研究所,上海200240 [2]上海交通大学上海市数字媒体处理与传输重点实验室,上海200240

出　　处：《中国图象图形学报》2007年第10期1827-1831,共5页Journal of Image and Graphics

基　　金：国家自然科学基金项目(60625103);国家高技术研究发展计划863项目(2006AA01Z124)

摘　　要：针对H.264视频编码标准可伸缩扩展部分采用Hierarchical-B结构实现了时域上的可分级特性.同时与传统的IPPP或者IBP编码结构相比,在编码增益上也有较大的提高。但其特殊的预测结构会造成图像质量的抖动,在有快速运动和场景切换时此现象尤甚。提出了一种简单的基于PSNR和MAD的恒定质量控制算法,通过在帧级选择合适的量化参数来限制图像质量的波动范围。该算法在JVT规定的标准基础上进行了仿真,实验结果表明,PSNR的方差大幅减小,并基本接近目标PSNR。The scalable extension of H. 264 video coding standard （SVC） has achievesd temporal scalability using Hierarchical-B structure. Compared to traditional coding structures like IPPP and IBBP, it has a significant coding gain as well. However, due to its hierarchical prediction dependency, quality fluctuation among consecutive frames may sometimes occur. Such situation usually gets worse when high motion or scene changes exist. In this paper, we propose a simple but effective constant quality algorithm based on PSNR and MAD measures. Restriction to the possible fluctuation is realized by adapting the quantization parameter （QP） at frame level. We simulate our method based on JVT official specification. Experimental results show that our algorithm has greatly reduced the PSNR variance and obtained the target PSNR simultaneously.

关 键 词：恒定质量 Hierarchical—B结构 可伸缩视频编码 

分 类 号：TN919.81[电子电信—通信与信息系统]