title: MATLAB ButtonDownFcn
body: <p>I have a project of "Optical Character Recognition" in MATLAB and i need your help:</p>
  
  <ol>
  <li><p>how do i recognize when the user press the mouse on an image?
  i trying to do this with ButtonDownFcn but even when i just printing message
  the message is not printed.  </p></li>
  <li><p>i want to allow the user to select the license plate from the image.
  how can i do this and save the Pixels of the selected area?</p></li>
  </ol>
  
  <p>thanks in advance.</p>