摘要
提出了一种新的1/4像素运动估计算法。新算法根据相邻分数像素点之间高度相关的运动估计匹配误差和运动矢量方向,选择最优整像素点周围最有可能的1/2像素点进行搜索,摈弃可能性较小的1/2像素点,在最优1/2像素点周围进行钻石搜索得到最优的1/4像素点。新算法只搜索7个点,与全搜索的16个点相比少了56.3%。实验证明,与全搜索法相比,新算法的峰值信噪比平均下降了0.06 dB,比特率平均上升了1.3%。
This paper presented a fast algorithm based on highly correlation of motion estimation cost and motion vector direction for H. 264. The new algorithm explored the most probable half-pel positions and abandoned the less probable ones. Then, it applied diamond search to the minimum half-pel to get the best quarter-pel. The new algorithm only examined 7 search points instead of 16 search points in the search algorithm of reference software. The simulation result shows that the proposed algorithm reduced about 56.3% of computation complexity compared to that in reference software but with nearly no peak signal noise rate（PSNR） degradation and bit rate increase.
出处
《计算机应用研究》
CSCD
北大核心
2008年第2期373-375,共3页
Application Research of Computers
基金
国家自然科学基金资助项目(60572152)
陕西省自然科学基金资助项目(2005F26)
关键词
H.264
相关性
匹配误差
运动矢量方向
H. 264
correlation
motion estimation cost
motion vector direction
