自学笔记：用python和opencv进行摄像头的人脸检测

import cv2
cascade = cv2.CascadeClassifier("haarcascade_frontalface_alt.xml")
cap = cv2.VideoCapture(0)
while True:
ret,frame = cap.read()
gray = cv2.cvtColor(frame,cv2.COLOR_BGR2GRAY)
#rect = cascade.detectMultiScale(gray,scaleFactor=1.3,minNeighbors=9,minSize=(50,50),flags = cv2.cv.CV_HAAR_SCALE_IMAGE)
rect = cascade.detectMultiScale(gray, scaleFactor = 1.2, minNeighbors = 3, minSize = (32, 32))
for x,y,z,w in rect:
cv2.rectangle(frame,(x,y),(x+z,y+w),(0,0,255),2)
cv2.imshow('frame',frame)
if cv2.waitKey(1) &0xFF == ord('q'):
break
cap.release()
cv2.destroyAllWindows()