python opencv 演示示例

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()