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)