基于opencv的口罩识别

import cv2
face_detect = cv2.CascadeClassifier(r'C:\Users\1\Desktop\haarcascade_frontalface_alt.xml')
# 识别电脑摄像头，并打开
cap = cv2.VideoCapture(0)
fourcc = cv2.VideoWriter_fourcc(*'XVID')
out = cv2.VideoWriter('output.avi',fourcc, 20.0, (640,480),True)
font = cv2.FONT_HERSHEY_SIMPLEX
while True:
    ret, img = cap.read()
    gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
    faces = face_detect.detectMultiScale(gray, 1.1, 3)
    for (x, y, w, h) in faces:
        # 参数分别为 图片、左上角坐标，右下角坐标，颜色，厚度
        face = img[y:y + h, x:x + w]  # 裁剪坐标为[y0:y1, x0:x1]
        mask_face = face_detect.detectMultiScale(gray, 1.1, 5)
        #ret, frame = cap.read()
        cv2.putText(img, 'Not Wearing A Mask', (0, 130), font, 2, (0, 0, 255), 2, cv2.LINE_AA)
        out.write(img)
        for (x2, y2, w2, h2) in mask_face:
            cv2.rectangle(img, (x2, y2), (x2 + w2, y2 + h2), (0, 0, 255), 2)
    cv2.imshow('Cheney', img)
    print(img)
    cv2.waitKey(3)
cv2.destroyAllWindows()