在数字视频处理中经常需要考虑斑点去除问题。运动矢量估计是斑点检测和去除的基本步骤。在斑点存在的区域，运动向量的估计可能会出现较大的偏差。大多数算法只通过空间上运动矢量的相关性来进行修正。本文根据空间上和时间上图像灰度和运动矢量相关的特点，并考虑块分级之间运动矢量的相关性，提出了一种运动估计的修正方法。仿真结果显示，本文的方法是有效的。

In the processing of digital video it is commonly needed to wipe out blotches in the image. Motion estimation is a basic step for this end. Sometimes, motion vectors may be far away from the true motion vector in the blotch area. Existing algorithms consider only spatial relations among motion vectors. These techniques are unsatisfactory to remove blotches completely. To improve this point, a method for estimating motion vectors considering the spatial and temporal relations among motion vectors is developed. At the same time, relations among hierarchical blocks are also considered in this paper. The result shows that the method is effective.