title: opencv python MatchTemplate function with multiple matches
body: <p>I'am trying to find small picture in a big picture and used MatchTemplate()</p>
  
  <pre><code>img = cv2.imread("c:\picture.jpg")
  template = cv2.imread("c:\template.jpg")
  
  result = cv2.matchTemplate(img,template,cv2.TM_CCOEFF_NORMED)
  y,x = np.unravel_index(result.argmax(), result.shape)
  </code></pre>
  
  <p>Works fine I always get coords of top left corner, but it's only one point. If I have a multiple matches on big picture, how i can get all of them ?  </p>