Python: 快速实现人脸识别
首先安装opencv：（在jupyter notebook里）
1 ! pip install opencv-python
接下来，从电脑的摄像头读取视频，识别视频内的人脸。
1 import cv2 2 3 face_cascade = cv2.CascadeClassifier('haarcascade_frontalface_default.xml') 4 5 cap = cv2.VideoCapture(0) # 0 means read video form camera of your computer 6 7 while True: 8 _, img = cap.read() 9 10 # img = cv2.imread('people.png') 11 12 gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY) 13 14 faces = face_cascade.detectMultiScale(gray, 1.1, 4) 15 16 for (x,y,w,h) in faces: 17 cv2.rectangle(img, (x,y), (x+w, x+h), (255, 0, 0), 2) 18 19 cv2.imshow('img', img) 20 21 k = cv2.waitKey(30) & 0xff 22 if k == 27: 23 break 24 25 cap.erlease()
从YouTube上学到的：
