title: Improve cvFindChessboardCorners
body: <p>Unfortunately, I was not able to find any solution to my question.</p>
  
  <p>What I'm trying to do is to improve the results using the OpenCV-method <code>cvFindChessboardCorners</code> in order to be able to achieve a better camera calibration, because I think that this is the reason why I get poor results undistorting/rectifying images like in my question before (<a href="https://stackoverflow.com/questions/20517989/undistorting-rectify-images-with-opencv">Question: Undistorting/rectify images with OpenCV</a>).</p>
  
  <p>So, what I want to know is, how I can improve the algorithm in order to be able to detect the chessboard corners in all images of this link: 
  <a href="http://abload.de/img/cvfindchessboardcorneoxs73.jpg" rel="nofollow noreferrer">http://abload.de/img/cvfindchessboardcorneoxs73.jpg</a></p>
  
  <p>Everything works fine, only in the two last images the chessboard could not be detected.
  Any help or advice or hint is very welcome!</p>
  
  <p>Thanks in advance!</p>