The second algorithm is proposed because the method of difference image is not effective when the different information coming from two frames of difference image is too much or too little.
算法二是针对两帧差分图像之间所提供的差异信息过多或过少这两种极端情况，用差影法粗分割对人脸图像进行预处理时失效而提出来的。
The third method is also three-steps algorithm, the difference between the second method and the third method is making a correction on the fine grid.
第三种算法也为一个三步格式，与第二种算法不同之处在于它是在细网格上作进一步校正。
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