opencv获取图像的脸部信息，并显示出来

opencv获取图像的脸部信息，并显示出来

import cv2
import os
if __name__ == '__main__':
    work_path=os.getcwd()
    a=cv2.imread(os.path.join(work_path,'data','7.jpg'),cv2.IMREAD_UNCHANGED)
    face=a[40:150,150:300]
    cv2.imshow('original',a)
    cv2.imshow('face',face)
    cv2.waitKey()
    cv2.destroyAllWindows()