x264中基于参数选择的算法优化  

Optimization algorithm based on parameter selection in x264

作　　者：刘晓芳[1] 夏哲雷[1] 殷海兵[1] 孟雷雷 

机构地区：[1]中国计量学院信息工程学院,浙江杭州310018

出　　处：《中国计量学院学报》2013年第4期403-408,共6页Journal of China Jiliang University

摘　　要：H.264的高压缩率是以高计算复杂度为代价,为了实现编码性能与复杂度之间的最优折中,依据峰值信噪比(PSNR)以度量失真度以及离线搜索率失真性能,通过调整编码器控制参数,来计算不同模式下编码的复杂度以及率失真度性能,使在一定率失真度下编码复杂度尽可能小.今基于主流编码器x264,关注Ref、Partitions、Trellis和Me四个参数,通过大量实验,得出率失真-复杂度(J-C)数据,依据这些数据可以快速计算出单位复杂度的率失真性能,以此寻找最优的编码器控制参数组合.In H.264the high compression rate was obtained at the cost of the high computational complexity. In order to achieve the optimal compromise between coding performance and complexity,PSNR was used to measure distortion and offline search rate-distortion performance.The coding complexity and distortion rate of different modes were calculated by adjusting the control parameters to get the smallest coding complexity in given distortion rates.Now,we got the rate distortion-complexity(J-C)data by experiments based on the mainstream encoder x264and the parameters of Ref,Partitions,Trellis and Me.The best encoder control parameter combination is found based on the data.

关 键 词：峰值信噪比 复杂度 率失真性能 

分 类 号：TN919.81[电子电信—通信与信息系统]