title: Python, OpenCV and Sudokus
body: <p>With the PDF below, I would like to do the following things.</p>
  
  <ol>
  <li>Localize the four sudoku grids so as to treat each of them separately.</li>
  <li>For each grid picture, I would like to obtain a matrix of the pictures corresponding to each cell.</li>
  <li>Finally, I would like to "find" the values printed in each cell.</li>
  </ol>
  
  <p>The problem is that I'm a real beginner with OpenCV (I've bought a book about OpenCV with Python but I've not received it yet).</p>
  
  <p>I'm not a beginner in Python, neither in math so every clue is welcomed.</p>
  
  <p><img src="https://i.stack.imgur.com/sSdrf.png" alt="enter image description here"></p>