OpenCV版本3.3.0，注意模型文件的路径要改成自己所安装的opencv的模型文件的路径，路径不对就会报错，一般在opencv-3.3.0/data/haarcascades 路径下
import numpy as npimport cv2face_cascade = cv2.CascadeClassifier('haarcascade_frontalface_default.xml')cap = cv2.VideoCapture(0)while True: ret,img = cap.read() gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY) faces = face_cascade.detectMultiScale(gray, 1.3, 5) for (x,y,w,h) in faces: cv2.rectangle(img,(x,y),(x+w,y+h),(255,0,0),2) cv2.imshow('img',img) if cv2.waitKey(1) &0xFF == ord('q'): breakcap.release()cv2.destroyAllWindows() 
