title: findHomography with RANSAC wrong outliering
body: <p>I am doing some object detection using features2d (ORB, SIFT etc)</p>
  
  <p>I am investigating further into homography with RANSAC.
  I found out that many good points are marked wrongly as outliers.</p>
  
  <p>There are lots of outliers that shouldn't be outliers inside the object (the book)</p>
  
  <p>I have tried to rise threshold <strong>up to 10</strong> but the result is pretty the same. 
  Can I do something to improve this situation?</p>
  
  <p>Is there something broke with RANSAC ?</p>