title: Cropping out an image from an existing image
body: <p>I would like to crop out an image from an existing image. I've taken an image and applied monochrome on it with threshold <code>98%</code> using imagemagick (is this doable in openCV?)</p>
  
  <p>The resulting image is this:</p>
  
  <p><img src="https://i.stack.imgur.com/MKcXt.png" alt="enter image description here"></p>
  
  <p>Now from this Image I would like to crop out another image so that the final image looks like this: </p>
  
  <p><img src="https://i.stack.imgur.com/hMTnv.png" alt="enter image description here"></p>
  
  <p><strong>Question</strong>
  How can I do this in OpenCV? Note, the only reason I want to crop the image is so that I can use <a href="https://stackoverflow.com/a/15699181/131194">this answer</a> to get the part of the text. If there is no need to crop out a new image and instead just concentrate on black part of the image to begin with, that would be great. </p>