H.264中4×4块的快速帧内预测算法  

Fast Intra-frame Prediction Algorithm for 4×4 Block in H.264

作　　者：王启文[1] 黄东军[1] 

机构地区：[1]中南大学信息科学与工程学院,长沙410083

出　　处：《计算机工程》2010年第2期217-219,共3页Computer Engineering

基　　金：国家自然科学基金资助项目(60873188)

摘　　要：视频压缩标准H.264/AVC的压缩率很高,但其算法复杂,编码时间较长。针对帧内4×4块提出基于方向预测模式度量的快速预测算法,通过对当前4×4块帧内预测方向的度量,利用相邻块和相邻方向预测模式的相关性进行帧内模式预测。实验结果表明,与全搜索算法相比,在采用全I帧编码的情况下,该算法的编码时间减少43%,输出的视频比特率仅增加0.8%,且PSNR基本保持不变。Video compression standard H.264/AVC has high compression ratio,but its algorithm is complex and the coding time is long. Aiming at the intra-frame 4×4 block,this paper proposes a fast prediction algorithm based on measurement of direction prediction mode. By measuring the intra-frame prediction direction of 4×4 block,it uses the correlation between neighboring blocks and neighboring direction prediction mode to predict the intra-frame mode. Experimental results show that compared with the full searching algorithm,this algorithm can decrease the coding time by 43% and only increase the output video bit rate by 0.8% while keeping PSNR almost unchanged.

关 键 词：帧内预测 预测方向 率失真优化 

分 类 号：TP37[自动化与计算机技术—计算机系统结构]