Opencv:视频中人脸检测并保存人脸图片

# OpenCV版本的视频检测
import cv2
 
 
# 图片识别方法封装
def discern(img):
    gray = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)
    cap = cv2.CascadeClassifier(
        "C:Python36Libsite-packagesopencv-masterdatahaarcascadeshaarcascade_frontalface_default.xml"
    )
    faceRects = cap.detectMultiScale(
        gray,scaleFactor=1.2,minNeighbors=3,minSize=(50,50))
    if len(faceRects):
        for faceRect in faceRects:
            x,y,w,h = faceRect
            cv2.rectangle(img,(x,y),(x + h,y + w),(0,255,0),2)  # 框出人脸
    cv2.imshow("Image",img)
 
 
# 获取摄像头0表示第一个摄像头
cap = cv2.VideoCapture(0)
while (1):  # 逐帧显示
    ret,img = cap.read()
    # cv2.imshow("Image",img)
    discern(img)
    if cv2.waitKey(1) & 0xFF == ord(‘q‘):
        break
cap.release()  # 释放摄像头
cv2.destroyAllWindows()  # 释放窗口资源