针对H.264运动估计中当前块的预测运动矢量极可能为最佳运动矢量这一特点,提出一种提前终止算法。根据可变块尺寸模式设定候选阈值,兼顾视频质量和运算复杂度确定最佳阈值,改进绝对误差和匹配准则,在JM10.2平台上验证算法性能。结果表明,新算法在保证视频质量的前提下,每个宏块中节省76.10%—94.12%搜索点数,极大地降低了运算复杂度。 In view of the fact that the predicted motion vector of the current block in H.264 motion estimation is likely to be the best motion vector, an early termination algorithm is proposed. According to the variable block size mode, candidate thresholds are set, both the video quality and computational complexity are taken into consideration to determine the optimal threshold, improve the absolute error and matching criteria, and verify the performance of the algorithm on the JM10.2 platform. The results show that the new algorithm saves 76.10% -94.12% of search points in each macroblock under the premise of ensuring video quality, which greatly reduces the computational complexity.