一种HEVC整像素运动估计优化算法  

Integer Pixel Motion Estimation Optimization Algorithm of HEVC

作　　者：崔岩松[1] 赵佳瑜[1] 任维政[1] 

机构地区：[1]北京邮电大学智能交通信息与网络技术实验室,北京100876

出　　处：《电视技术》2015年第3期61-63,共3页Video Engineering

摘　　要：对HEVC整像素运动估计算法进行优化,目的是在保持编码视频压缩后码流率和解码视频图像质量基本不变的同时,降低编码耗时。首先,统计了不同视频序列的进行帧间预测时整像素运动估计的搜索步长的分布。进而根据统计结果,改进了不同搜索步长下的分支搜索模板。同时调整了整像素运动估计的提前终止条件。最终比较了测试视频序列优化前后编码输出的YUV分量、码流和耗时。实验结果表明,对于class E(1 920×1 080)视频序列,在编码后视频质量的客观值(YUV分量)最多下降0.182 2 d B,比特率最多上升0.40%,耗时最少下降1.25%。Aiming at reducing coding time consuming, the algorithm of inter pixel motion of HEVC is optimized, while keeping high compression ratio of video and same encoded image quality. Firstly, the distribution of the size of search step in integer pixel motion estimation of different video sequences is counted. Then according to statistical results, the branch search templates in dif- ferent search step length are improved, while adjusting the inter pixel motion estimation termination condition. Finally, results of YUV component value, output bit stream and time-consuming are compared between before and after optimization encoded video sequences. Experimental results show that, for the class E（ 1 920 × 1 080） video sequences, these video quality objective values （YUV component） fall by 0. 182 2 dB. bit rate rise to 0. 40% , and time consuming at least decrease 1.25%.

关 键 词：视频编码 HEVC 帧间编码 运动估计 

分 类 号：TN919[电子电信—通信与信息系统] TB91[电子电信—信息与通信工程]