An Improved Rate Control Method Based on Modification at Scene Change for H.264  

作　　者：RU Guobao GAO Wenli FU Jianfeng 

机构地区：[1]School of Electronic Information, Wuhan University, Wuhan430072, Hubei, China

出　　处：《Wuhan University Journal of Natural Sciences》2007年第6期1047-1050,共4页武汉大学学报（自然科学英文版）

基　　金：Supported by the National Natural Science Foundation of China (60372057)

摘　　要：This paper presents an improved rate control method for H.264. First, the scene changes are detected by the average absolute difference of the brightness histograms between the adjacent frames. Then, the bit allocation and quantization parameters are adjusted, using a certain threshold. In addition, the calculation of the mean absolute difference （MAD） is modified in an alternative way, which makes the rate distortion optimization （RDO） more accurate. Extensive simulation results show that the proposed method, compared with G012, can improve the average peak signal-to-noise ratio （PSNR） and moderate the image quality.This paper presents an improved rate control method for H.264. First, the scene changes are detected by the average absolute difference of the brightness histograms between the adjacent frames. Then, the bit allocation and quantization parameters are adjusted, using a certain threshold. In addition, the calculation of the mean absolute difference （MAD） is modified in an alternative way, which makes the rate distortion optimization （RDO） more accurate. Extensive simulation results show that the proposed method, compared with G012, can improve the average peak signal-to-noise ratio （PSNR） and moderate the image quality.

关 键 词：brightness histogram mean absolute difference （MAD） rate distortion optimization （RDO） rate control scene change 

分 类 号：TN919[电子电信—通信与信息系统]