一种结合人眼视觉特性的H.264/AVC码率控制算法  

Human visual system-based rate control algorithm for H.264/AVC

作　　者：郑巧燕[1] 郁梅[1,2] 彭宗举[1] 邵枫[1] 李福翠[1] 蒋刚毅[1,2] 

机构地区：[1]宁波大学信息科学与工程学院,浙江宁波315211 [2]南京大学计算机软件新技术国家重点实验室,江苏南京210093

出　　处：《光电子．激光》2011年第3期440-445,共6页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金资助项目(60872094;60832003;61071120);教育部博士点基金资助项目(20093305120002;200816460003);浙江省自然科学基金资助项目(Y1090752);浙江省教育厅重点资助项目(Z200909361)

摘　　要：针对应用于H.264/AVC视频编码中的码率控制算法G012的不足,提出了一种结合人眼视觉特性的H.264的码率控制算法。首先基于当前帧与前一帧的帧差比值来表示各帧图像的相对复杂程度,以此分配帧级的目标比特数;通过分析图像中的运动信息和纹理特征,给出了一种简单有效的度量宏块视觉敏感度的方法,并在基本单元层利用此视觉敏感度因子进行比特分配。实验结果表明,所提出方法能更加接近目标码率,PSNR波动小,并获得了较好的主观质量。To improve the performance of rate control algorithm G012 for H.264/AVC,a human visual system-based rate control algorithm is proposed in this paper.The frame difference ratio of current frame to its previous frame was utilized to represent the motion complexity of the frame,and to be the guidancefor bit allocation at frame level.Moreover,simple and effective scheme for measuring visual sensitivity of macroblock via analyzing the motion information and texture characteristics of the frames was introduced,and the bit allocation at basic unit was based on the measured visual sensitivity.The experimental results show that the rate output by the proposed algorithm is more close to the target rate,and PSNR fluctuation is lower compared with that of G012 algorithm,So the subjective quality of the reconstructed video signals is more satisfying.

关 键 词：H.264/AVC 码率控制 基本单元层 视觉敏感度因子 

分 类 号：TN919.81[电子电信—通信与信息系统]