适用于H.264/AVC的快速帧内预测算法  

A Fast Intra Prediction Algorithm Applied in H.264/AVC

作　　者：宋建斌[1] 李波[1] 李炜[1] 吴波[1] 

机构地区：[1]北京航空航天大学计算机学院数字媒体室,北京100083

出　　处：《电子学报》2007年第4期668-672,共5页Acta Electronica Sinica

基　　金：国家自然科学基金(No.60505007);新世纪优秀人才支持计划基金;武器装备预研基金;教育部博士点基金;ERIPKU基金

摘　　要：帧内预测算法极大地提高了I帧的压缩比率,但极高的计算复杂度与视频系统中计算资源有限、应用环境实时性要求高形成矛盾.本文提出了帧内预测快速算法,根据图像复杂程度进行块尺寸的选择,对于4×4块,利用环形滑动窗口动态缩小预测模式选择范围,定义简化的块匹配准则并采用计算及时终止策略.实验证明,在保持恢复图像质量几乎不降的同时,速度能提高到两倍多.快速算法具有额外计算量小,提速效果明显等特点.Intra prediction applied in H.264/AVC improve compression efficiency gready of I flame.But the full search algorithm is computationaUy expensive and there exist conflict with some real time application and embedded systems just holding limited calculation resource. In order to promote prediction speed, a fast intra prediction algorithm is proposed which select appropriate coding block size based on complexity of the image, use annular slide window to select prediction mode dynamically and define a simple block match regulation. Experiments prove it is so practical and valid that the match speed has been doubled while the quality of reconstruct picture is nearly not decrease.

关 键 词：视频编码 帧内预测 块尺寸 环形滑动窗口 块匹配准则 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]