摘要
为提高H.264/AVC视频编码器的计算速度,提出了一种搜索模式自适应快速运动估计算法(PAFME)。该算法结合了变块尺寸运动估计的特点,利用运动矢量的时空域相关性,预测初始搜索中心;采用多种搜索模式,提出了搜索模式自适应的选择机制,以节省不必要的搜索点和加快搜索速度;避免了陷入局部极小。实验结果表明,与H.264/AVC的参考软件JM12.4相比,该算法使整像素精度运动估计的耗时平均降低了33%左右,同时保持了编码效率基本不变。
In order to increase algorithm speed in H. 264/AVC video coder, a search pattern adaptive fast motion estimation algorithm （PAFME） was presented. This algorithm was combined with the characteristic of variable block size motion estimation and temporal-spatial relation of motion vectors was utilized to predict initial search center. Diverse search patterns and adaptive selec- tion mechanism were employed in order to skip unnecessary search points. Search speed was improved and dropping into the local- minimum was avoided. The experimental results show that, compared with the H. 264/AVC reference software JM12.4, the proposed algorithm reduces about 33% of pixel precision motion estimation consuming time on average with the very similar encoding efficiency.
出处
《机电工程》
CAS
2009年第3期28-31,共4页
Journal of Mechanical & Electrical Engineering
