python opencv 演示示例

一、环境安装

pip install opencv-python

二、打开摄像头显示人脸项目

import cv2
face_casade=cv2.CascadeClassifier(cv2.data.haarcascades+'haarcascade_frontalface_default.xml')cap=cv2.VideoCapture(0)while True:ret,frame=cap.read()if ret:gray=cv2.cvtColor(frame,cv2.COLOR_BGR2GRAY)faces=face_casade.detectMultiScale(gray,1.3,5)for(x,y,w,h) in faces:cv2.rectangle(frame,(x,y),(x+w,y+h),(255,0,0),2)cv2.imshow('mawlan',frame)if cv2.waitKey(1)==ord('q'):break
cap.release()
cv2.destroyAllWindows()