title: Python + OpenCV = How to crop circle?
body: <p>The below is the code:</p>
  
  <pre><code>self.img = cv2.imread(image,)
  circle = cv2.HoughCircles(self.img, 3,
                            dp=1.5, minDist=1000, minRadius=100, maxRadius=1000)
  red = (0,0,255)
  x = circle[0][0][0]
  y = circle[0][0][1]
  r = circle[0][0][2]
  cv2.circle(self.img, (x, y), r, red, 2)
  
  
  
      x - X
      y - Y
      r - Radius
      For example: 521.25, 506.25, 318.919
  </code></pre>
  
  <p>From the code how to crop the circle from the given example ?</p>