基于场景切换的码率控制方法  

Rate Control Algorithm Based on Scene Change

作　　者：王悦[1] 薛永林[1] 

机构地区：[1]清华大学数字电视技术研究中心,北京100084

出　　处：《电视技术》2009年第12期17-20,37,共5页Video Engineering

摘　　要：H.264及AVS所采用的码率控制算法未包含对场景切换的相应处理,因而导致场景切换及后续帧编码质量严重下降。为有效解决该问题,提出了一种附加运算量很小的场景切换检测的方法,以及在图像组(GoP)重新分组的基础上对新GoP第1个P帧的量化参数加以调整的场景切换处理方法。实验证明,使用该算法后的测试结果在序列平均PSNR和码率控制准确程度上均有改善,并有效减少了缓冲区上溢的发生。The rate control scheme adopted by H.264 and AVS doesn＇t include solutions for scene change, which leads to serious quality degradation in scene change frames and adjacent frames. In this paper, a scene change detection method with little additional calculation is proposed, as well as a scene change processing algorithm which adjusts the quantization parameter of the first P frame in the new group based on group re-division mechanism. Experimental results prove that the algorithm improves the average PSNR of the sequence and the rate accuracy, and reduces the occurrence of buffer overflow substantially.

关 键 词：视频编码 场景切换检测 重分组 

分 类 号：TN919.8[电子电信—通信与信息系统]