title: How to detect two vertical lines with image processing?
body: <p>I am trying to detect two vertical lines shown in the attached images using some image processing methods. The line are in low contrast.</p>
  
  <p>The location is shown in the first image with yellow arrows.
  The original image is also attached.</p>
  
  <p>I tried using adaptiveThresholding and normal thresholding using maximum and minimum at local windows. But I can't detect the lines.</p>
  
  <p>Any ideas how to detect the two vertical lines in image processing?</p>
  
  <p><a href="https://i.stack.imgur.com/gKnTB.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/gKnTB.jpg" alt="enter image description here"></a></p>
  
  <p><a href="https://i.stack.imgur.com/sjB8q.jpg" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/sjB8q.jpg" alt="enter image description here"></a></p>