关键词: H.264, 运动矢量, 空间相关性, 运动估计, 整像素运动块

Abstract: With the development of fast integer pixel motion estimation algorithms, the proportion of the computational cost of fractional pixel motion estimation in that of the whole motion estimation has become more and more significant. To reduce the complexity of fractional pixel motion estimation, a novel method of H.264 fractional pixel motion estimation based on the spatial correlation of motion vector is proposed. It predicts Integer Pixel Motion Block（IPMB） using the spatial correlation of motion vector. It skips the fractional pixel search process for IPMB. Experimental results show that combined with the full fractional pixel search algorithm, the proposed algorithm can reduce 60% of fractional pixel search points while maintaining the search accuracy basically compared with the pure full fractional pixel search algorithm. The proposed algorithm can be combined with other fractional pixel search algorithm to get better coding performance.

Key words: H.264, motion vector, spatial correlation, motion estimation, Integer Pixel Motion Block（IPMB）