H.264帧内预测模式选择快速算法  

Fast intra-prediction mode selection algorithm for H.264

作　　者：孙杨[1] 王英坤[1] 徐伯庆[1] 

机构地区：[1]上海理工大学光电信息与计算机工程学院,上海200093

出　　处：《计算机工程与应用》2012年第26期148-151,205,共5页Computer Engineering and Applications

摘　　要：帧内预测是H.264视频编码标准的重要组成部分。为了保证在图像质量和编码比特率大致不变的前提下,减少帧内预测模式选择的编码时间,提出了一种基于4′4块的纹理方向性和4′4块与16′16块之间的相关性并通过设置双阈值进行选择预测模式的快速算法。实验结果表明该算法与帧内预测编码的全搜索算法相比,编码时间节约了35%～40%,信噪比损失了0.03～0.1dB。Intra-prediction is an important part of H.264. A fast algorithm for intra-prediction mode decision is pre- sented in this paper to ensure image with less performance degradation and bit-rate increase, while reducing intra- prediction coding time. It uses the texture direction of 4 x 4 block and the correlation between 4 ~ 4 block and 16 x 16 block to predict the intra-frame mode, which chosen by double thresholds. Experimental results show that compared with the full searching algorithm, this algorithm can decrease the coding time by 35%-40%, while PSNR drops 0.03-0.1 dB.

关 键 词：H.264 帧内预测 模式选择 率失真优化 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]