Python+opencv实现调取摄像头识别人脸，并将人脸转化为灰度图并保存到本地

本人使用pycharm编写

1.实现代码

import cv2
import numpy as np
save_path = 'E:/YOURS PHOTOS/'
cap = cv2.VideoCapture(0)
face_cascade = cv2.CascadeClassifier("haarcascade_frontalface_alt2.xml")
face_cascade = cv2.CascadeClassifier("C:/Program Files/Python36/Lib/site-packages/cv2/data/haarcascade_frontalface_alt2.xml")
i = 0
while(True):
    ret,frame = cap.read()
    gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)
    faces = face_cascade.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)
        roiImg = frame[y:y+h,x:x+w]
        gray = cv2.cvtColor(roiImg, cv2.COLOR_BGR2GRAY)
        cv2.imwrite(save_path + str(i) + '.jpg',gray)


    cv2.imshow("camera",frame)



    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

cap.release()
cv2.destroyAllWindows()

save_path = ‘E:/YOURS PHOTOS/’ 这部分表示你要储存的路径。
cv2.imwrite(save_path + str(i) + ‘.jpg’,gray) 保存