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

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.