双向亚像素运动估计算法，具体步骤如下：

(1) 进行整像素精度的双向运动估计；

(2) 以(1)得到的运动矢量所指向的像素点为中心，内插1/2像素点，再进行双向运动估计；

依此类推，直到得到所需的像素精度为止。

-Bi-directional sub-pixel motion estimation algorithm, concrete steps are as follows: (1) for the whole two-pixel accuracy motion estimation　(2) to (1) obtained by the motion vectors point to point as the center pixel, interpolation 1/2 pixel points, bi-directional motion estimation again　and so on, until the necessary pixel accuracy so far.