title: Find Homography matrix from Fundamental matrix
body: <p>I'm trying to compute Homography matrix <code>H</code> given a set of correspondences and the Fundamental matrix <code>F</code>.</p>
  
  <p>From the principle of Epipolar geometry I know this can be done by cross product of epiline and <code>F</code> from <a href="http://www.cs.unc.edu/~marc/tutorial/node44.html" rel="nofollow noreferrer">Epipole Geometry</a></p>
  
  <p><code>[e_ij] x F_ij  = H_ij</code></p>
  
  <p><img src="https://i.stack.imgur.com/kmwRf.jpg" alt="Epipolar image"></p>
  
  <p>I'm using <code>OpenCV</code> for finding Fundamental matrix <code>F</code> from set of matches between two views using <code>cv::findFundamentalMat()</code>.</p>
  
  <p>My question is that how can I find <code>e_ij</code> and how to use it in order to compute <code>H</code>. In <code>OpenCV</code> there is a function <code>cv::computeCorrespondEpilines()</code> that finds epilines corespond to each given point.</p>
  
  <p>It's worth mentioning that I'm not interested in computing <code>H</code> directly from set of matches but only from computed Fundamental matrix.</p>
  
  <p>Thanks</p>