中文说明：人脸识别的基本方法是先将图像二值化处理，再进行一系列操作，从而勾画出人脸区域，但基本方法对某些图像不能进行准确的区域勾画。方法的改进中加入了腐蚀与膨胀这两个步骤，从而能精确的勾画出人脸区域。
English Description：
Face recognition methods is to first image binarization, and then through a series of actions, so as to outline the face area, but the basic method for certain image cannot be accurately sketched. Improvement of erosion and dilation are joined in these two steps, thus accurately sketched out the face area.