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 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.
整个面部的挤压和拉伸，在第五和第八帧分别达到极端形状，延迟于眉毛一祯。
The entire head squashes and stretches, hitting extremes on frames 5 and 8, respectively (trailing the brows by a frame).
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