Python OpenCV face detection code sometimes raises `'tuple' object has no attribute 'shape'`

Question

I am trying to build a face detection application in python using opencv.
Please see below for my code snippets:

 # Loading the Haar Cascade Classifier
c         


        

Answer 1

import numpy as np 
import cv2

face_cascade = cv2.CascadeClassifier('haarcascade_frontalface_default.xml')
image = cv2.imread('myfriends.jpg')
grayImage = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
faces = face_cascade.detectMultiScale(grayImage)
print ("Number of faces detected: " + str(faces.shape[0]))
for (x,y,w,h) in faces:
    cv2.rectangle(image,(x,y),(x+w,y+h),(0,255,0),1) 
cv2.rectangle(image, ((0,image.shape[0] -25)),(270, image.shape[0]), (255,255,255), -1) 
cv2.putText(image, "Number of faces detected: " + str(faces.shape[0]), (0,image.shape[0] -10), cv2.FONT_HERSHEY_TRIPLEX, 0.5, (0,0,0), 1)
cv2.imshow('Image with faces',image)
cv2.waitKey(0)
cv2.destroyAllWindows()