基于相关性的H.264自适应模式判决算法  

Adaptive mode decision algorithm for H.264 based on correlation

作　　者：朱金秀[1] 曹宁[2] 李国选[1] 

机构地区：[1]河海大学计算机及信息工程学院,江苏常州213022 [2]河海大学电气工程学院,南京210098

出　　处：《计算机应用研究》2010年第1期371-373,共3页Application Research of Computers

基　　金：河海大学创新基金资助项目(2008B002-03)

摘　　要：提出了一种基于时空相关性的H.264自适应模式快速判决算法。该算法首先根据前帧已编码宏块各模式的比率大小顺序来确定当前宏块模式判决顺序;利用前帧中宏块编码模式的平均率失真及当前帧的图像复杂度自适应地预测当前帧宏块相应编码模式的阈值。实验表明,本算法平均可以节省编码时间75%以上,同时PSNR下降约为0.07 dB,有利于实时应用。This paper proposed a fast adaptive mode decision algorithm based on spatial-temporal correlation. The mode decision order of current MB was determined by the order of the ratio of coded MB modes in previous frame. It calculated each average rate- distortion cost of the related mode in pervious frames and the image complexity. Then,used them predicate adaptively the decision threshold of related mode for current MB to determine whether to terminate early. The experimental results show that the proposed method can save the encoding time up to 75% on average with 0.07 dB performance degradation that can be used in real-time applications.

关 键 词：自适应阈值 图像复杂度 率失真优化 模式判决 

分 类 号：TN919.8[电子电信—通信与信息系统]