title: Open cv face recognition python
body: <p>I started learning some object recognition and I'm interested in <code>openCV</code>. First of all, I tried the tutorial where your face is recognized. I installed numPy and <code>openCV</code>. When I tried running the program below, I received this error: </p>
  
  <blockquote>
    <p>File "path to my program\camera.py", line 4, in 
        face_cascade = cv2.CascadeClassifier('haarcascade_frontalface_default.xml')
    cv2.error:
    D:\Build\OpenCV\opencv-3.1.0\modules\core\src\persistence.cpp:2220:
    error: (-212) haarcascade_frontalface_default.xml(1): Valid XML should
    start with '' in function icvXMLParse</p>
  </blockquote>
  
  <p>I was trying to find the answer to this question everywhere but I failed. I found a lot of other people had this problem, but the solutions didn't work. I tried re-installing python, installing a different <code>openCV</code> etc.</p>
  
  <p>My code is here: </p>
  
  <pre><code>import numpy as np
  import cv2
  
  face_cascade = cv2.CascadeClassifier('haarcascade_frontalface_default.xml')
  
  eye_cascade = cv2.CascadeClassifier('haarcascade_eye.xml')
  
  cap = cv2.VideoCapture(0)
  
  while 1:
      ret, img = cap.read()
      gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)
      faces = face_cascade.detectMultiScale(gray, 1.3, 5)
  
      for (x,y,w,h) in faces:
          cv2.rectangle(img,(x,y),(x+w,y+h),(255,0,0),2)
          roi_gray = gray[y:y+h, x:x+w]
          roi_color = img[y:y+h, x:x+w]
  
          eyes = eye_cascade.detectMultiScale(roi_gray)
          for (ex,ey,ew,eh) in eyes:
              cv2.rectangle(roi_color,(ex,ey),(ex+ew,ey+eh),(0,255,0),2)
  
      cv2.imshow('img',img)
      k = cv2.waitKey(30) &amp; 0xff
      if k == 27:
          break
  
  cap.release()
  cv2.destroyAllWindows()
  </code></pre>
  
  <p>I will be grateful for any help.</p>
  
  <p>P.S.: My <code>xml</code> program starts with <code>&lt;?xml...?&gt;</code></p>