Python调用笔记本摄像头并实现人脸检测

人脸检测，眼睛检测，笑脸检测。比较笨拙，自己调试吧。

#Python中实现视频流中的人脸检测
import cv2
cap = cv2.VideoCapture(0)
face = cv2.CascadeClassifier(r'./haarcascade_frontalface_default.xml')
eye =  cv2.CascadeClassifier(r'./haarcascade_eye.xml')
smile = cv2.CascadeClassifier(r'./haarcascade_smile.xml')
while(1):
    ret,frame = cap.read()
    gray = cv2.cvtColor(frame,cv2.COLOR_RGB2GRAY)
    faces = face.detectMultiScale(gray,1.1,3,0,(200,100))
    for (x,y,w,h) in faces:
        img = cv2.rectangle(frame,(x,y),(x+w,y+h),(255,255,0),2)
        gray_roi = gray[y:y+h,x:x+h]
        eyes = eye.detectMultiScale(gray_roi,1.02,3,0,(50,50))
        for (ex,ey,ew,eh) in eyes:
            cv2.rectangle(img,(x+ex,y+ey),(x+ex+ew,y+ey+eh),(0,255,0),2)
    smiles = smile.detectMultiScale(gray,1.1,3,0,(100,100))
    for (sx,sy,sw,sh) in smiles:
        cv2.rectangle(frame,(sx,sy),(sx+sw,sy+sh),(0,255,255),2)
    cv2.imshow('Cam',frame)
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break
cap.release()
cv2.destroyAllWindows()