title: OpenCV cvFindContours questions
body: <p>I'm following this guide: <a href="http://www.aishack.in/2010/08/sudoku-grabber-with-opencv/2/" rel="nofollow">http://www.aishack.in/2010/08/sudoku-grabber-with-opencv/2/</a>
  and modifying to iOS 5.0.</p>
  
  <p>I managed to find the largest contour (the sudoku "board"), however, it only locates the surrounding square, without the lines inside, as in the tutorial. can this be easily solved?</p>
  
  <p>I'll try and find a way around it, but still would like to know. thanks!</p>