摘要：

提出一种新的空间自适应预测算法，将其与H.264运动估计中的非对称十字型多层次六边形格点(UMH)搜索算法相结合，预测当前块的运动趋势。实验结果表明，在峰值信噪比和码率几乎无变化的情况下，该算法相比UMH算法，运动估计时间平均减少了9%，运动搜索点数平均减少了13%，运动估计的复杂度显著降低，编码器的实时性得到增强。

关键词: H.264编码器, 空间预测, 运动估计, 非对称十字型多层次六边形格点算法

Abstract: This paper proposes a spatial-adaptive search algorithm, and combines it with Unsymmetrical Multi-resolution Hexagon(UMH) search algorithm in H.264 to predict the motion trend of present block. Experimental results show that the algorithm can decrease 9% motion estimation time and 13% search points without losing PSNR and bit rate, compared with UMH algorithm. The computational complexity of motion estimation is reduced evidently and real-time characteristic is strengthened.

Key words: H.264 encoder, spatial prediction, motion estimation, Unsymmetrical Multi-resolution Hexagon(UMH) algorithm

中图分类号: 

• TP301.6