title: Inverse Homography
body: <p>I get an H matrix using findHomography function. </p>
  
  <pre><code>H = findHomography(points_src, points_dst);
  </code></pre>
  
  <p>Then, I use H with warpPerspective to get a perspective projection of the image </p>
  
  <pre><code>warpPerspective(im_src, im_dst, H, Size(100, 100));
  </code></pre>
  
  <p>and from here I get a set of points of interest</p>
  
  <pre><code>vector&lt;Point2f&gt; points = some_function(im_dst)
  </code></pre>
  
  <p>Now I want to get back only the set of "points" to the original image and in this way I will now the set of points of interest in the original image.</p>
  
  <p>For this task, I guess that I need to use again warpPerspective with the flag WARP_INVERSE_MAP but this does not work.</p>