多张人脸识别

 1 import cv2 as cv
 2 def face_detect_demo():
 3     # 将图片转化为灰度图片
 4     gray = cv.cvtColor(img,cv.COLOR_BGR2GRAY)
 5     # 加载特征数据
 6     face_detector = cv.CascadeClassifier(‘D:/Opencv/opencv/sources/data/haarcascades/haarcascade_frontalface_default.xml‘)
 7     faces = face_detector.detectMultiScale(gray,scaleFactor=1.01,minNeighbors=4,maxSize=(30,30))
 8     for x,y,w,h in faces:
 9         print(x,y,w,h)
10         cv.rectangle(img,(x,y),(x+w,y+h),color=(0,255,0),thickness=2)
11         cv.circle(img,center=(x+w//2,y+h//2),radius=w//2,color=(0,0,255),thickness=2)
12     cv.imshow(‘result‘,img)
13 # 加载图片
14 img = cv.imread(‘C:/Users/87823/Desktop/NBA2.jfif‘)
15 face_detect_demo()
16 cv.waitKey(0)
17 cv.destroyAllWindows()