一种适宜于H.264/AVC的帧间快速编码算法

A fast inter-frame prediction algorithm applied in H.264/AVC

针对新一代视频编码技术H.264/AVC编码计算复杂度较高,为提高其编码速度,提出了一种新的适宜于H.264/AVC的帧间快速编码算法。首先利用运动和纹理预测可能的编码模式,排除可能性较小的模式;然后利用时间和空间相关性预测各种编码模式的可能性大小和编码顺序,并结合相关性和量化参数利用率失真和残差系数提前终止。实验结果表明,本文算法编码速度能提高72%左右,同时对编码效率影响很小。

H. 264/AVC achieves higher compression efficiency than previous video coding standards. Howerer,this performance gain comes at the cost of an increased computational complexity due to the use of variable block-size motion estimation and multiple reference frames. Thus, it is very important for H. 264/AVC to improve the coding speed, therefore this paper proposes a fast inter-frame coding algo- rithm applied in the H. 264/AVC video coding standard. Firstly,the candidate modes of current MB are predicted based on moving and texture, excluding the coding modes with low probability to be selected by current MB; Secondly, the mode possibilty orders are estimated based on inter-layer and spatial correla- tions, then the modes are sorted into sequential list according to the possibility orders from high to low~ Thirdly, the relationship between mode distribution and variation o{ quantization parameter, temporal and spatial correlation are estimated, then the rate-distortion early termination is proposed combining with the relationshiplFinally, the modes are checked sequentially with the rate-distortion early termination. When the rate-distortion early termination condition is satisfied,the encoding procedure is terminated to improve the coding speed. The experimental results show that the encoding speed for the proposed algo rithm can be improved by 72% with negligible coding loss.