title: AttributeError: 'module' object has no attribute 'QueryFrame'
body: <p>I am trying to test to decode a qr code real time using python and <strong>openCV 3.0</strong>.But now I am getting an error message on my terminal. I tried to search on the internet but I still unable to solve it. Can I know whats the error.</p>
  
  <p>This is my Python code:</p>
  
  <pre><code>import cv2 as cv
  
  import zbar
  
  def scanner_procces(frame,set_zbar):    
      set_width = 100.0 / 100
      set_height = 90.0 / 100
  
      coord_x = int(frame.width * (1 - set_width)/2)
      coord_y = int(frame.height * (1 - set_height)/2)
      width = int(frame.width * set_width)
      height = int(frame.height * set_height)
  
      get_sub = cv.GetSubRect(frame, (coord_x+1, coord_y+1, width-1, height-1))
  
      cv.Rectangle(frame, (coord_x, coord_y), (coord_x + width, coord_y + height), (255,0,0))
  
      cm_im = cv.CreateImage((get_sub.width, get_sub.height), cv.IPL_DEPTH_8U, 1)
      cv.ConvertImage(get_sub, cm_im)
      image = zbar.Image(cm_im.width, cm_im.height, 'Y800', cm_im.tostring())
  
      set_zbar.scan(image)
      for symbol in image:
              print '\033[1;32mResult : %s symbol "%s" \033[1;m' % (symbol.type,symbol.data)
  
      cv.ShowImage("webcam", frame)
      cv.WaitKey(10)
  
  
  if __name__ == "__main__":
  
      cv.namedWindow("webcam", cv.WINDOW_AUTOSIZE)
      capture = cv.VideoCapture(0)
      set_zbar = zbar.ImageScanner()
      while True:
          frame = cv.QueryFrame(capture)
          scanner_procces(frame,set_zbar)
  </code></pre>
  
  <p>This is the error code:</p>
  
  <pre><code>AttributeError: 'module' object has no attribute 'QueryFrame'
  </code></pre>
  
  <p>This is the traceback message:</p>
  
  <pre><code>init done 
  opengl support available 
   select timeout
  Traceback (most recent call last):
    File "realtimetestwebcam.py", line 38, in &lt;module&gt;
      scanner_procces(frame,set_zbar)
    File "realtimetestwebcam.py", line 9, in scanner_procces
      coord_x = int(frame.width * (1 - set_width)/2)
  AttributeError: 'numpy.ndarray' object has no attribute 'width'
  </code></pre>
  
  <p>Is it the error because of the opencv version? Thank you.</p>