title: Choosing Lines From Hough Lines
body: <p>I'm using Hough Lines to do corner detection for this image. i plan to find the intersection of the lines as the corner.
  This is the image.
  <img src="https://i.stack.imgur.com/tvOX2.jpg" alt="enter image description here"></p>
  
  <p>Unfortunately, Hough return lots of lines for each line I expect
  <img src="https://i.stack.imgur.com/PlyQJ.jpg" alt="enter image description here"></p>
  
  <p>How do I tune the Hough Lines so there is only four lines each corresponds to actual line on the image?</p>