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 estima

测帧间位移的一种方法：下采样后相位相关（精度可到亚像素）N1,N2需要是4的整倍数。-Interframe displacement measurement methods: phase correlation after the down-sampling (sub-pixel accuracy can be) N1, N2 need is a whole multiple of 4.

关于相位相关的算法，用于配准，有些可以达到亚像素-on phase correlation algorithm for registration, and some can reach sub-pixel