Motion Estimation ,运动估计

1、Motion Estimation in x264

 

x264's ME methods in order from best quality to worst:
SATD Exhaustive (tesa)
Exhaustive (esa/full)
Uneven Multi-Hex (umh)
Hexagon (hex)
Diamond (dia/epzs)

 

x264 has 5 fullpel motion estimation modes: 
radius-1 diamond, 
radius-2 hex (default), 
UMH (somewhat similar to JM), 
exhaustive (implemented fast via sequential elimination), 
and Hadamard exhaustive (implemented approximately via thresholded sequential elimination).

参考:X264的运动估计算法研究  作者: 丁超, 陈涛, DING Chao, CHEN Tao

 

2、Motion Estimation in HM

 

 

HM 中8PointDiamondSearch 和8PointSquareSearch 算法,默认使用是8PointDiamondSearch,但是Diamond算法的搜索点要比Square要多,Square算法不论半径是多大时一圈都是8个点,而根据代码中的Diamond算法,只有在半径小于等于8时一圈才是8个点,而当半径大于8时,一圈要搜索4+3*4 =16个点,除了搜索菱形的四个顶点外,还搜索了每条边1/4、2/4、3/4处的点。

 

posted @ 2013-03-05 16:40  mlj318  阅读(618)  评论(0编辑  收藏  举报