方法：用基于像素的形态学测量法比较三组的白质密度。
Methods: White matter density was compared among three groups by voxel-based morphometry.
本文论述了一种像素点匹配算法，它融合了光流法和基于颜色密度分布的方法，结合了两者的长处。
I described a point correspondence algorithm in the text, the algorithm combined two methods, optical flow and color density distribution, it also took advantages of them.
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