中文说明：将人脸作为输入图像，经db1滤波提取特征点后，将人脸图像转换为灰度图像，再转换为二次转换图像。但是通常只有边界可以从canny边缘检测跟踪。在这个深度显示程序中还采用了cannu边缘检测
English Description：
the human face is given as an input image and it will be converted to gray scale image and then to double converted image after that db1 filter is used to extract the feature points of the image. But normally only boundaries can be tracked from the canny edge detection. In this the depth also shown in the program by using cannu edge detection