OpenCV人脸识别

import cv2
 
filename = 'pic.jpg'
 
def detect(filename):
    face_cascade = cv2.CascadeClassifier('./haarcascade_frontalface_default.xml')
 
    img = cv2.imread('pic.jpg')
    print(1)
    gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
    faces = face_cascade.detectMultiScale(gray,1.3,5)
 
    for (x,y,w,h) in faces:
        img = cv2.rectangle(img,(x,y),(x+w,y+h),(255,0,0),2)
    cv2.namedWindow("Image")
    cv2.imshow("Image",img)
    cv2.waitKey(0)
 
detect(filename)