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()