中文说明：将所以的人脸图像规一化，用灰度投影法定位脸的左右两侧，再用灰度投影大致定位眼睛，根据眼睛的距离进行几何缩放，将人脸规一化。
English Description：
The gray projection method is used to locate the left and right sides of the face, and then the gray projection method is used to roughly locate the eyes. According to the distance between the eyes, geometric scaling is used to normalize the face.