title: isolate license plate numbers opencv
body: <p>I would like to know how I can process an image of a License plate so I can use this output with an OCR Library like Tesseract.
  Here you can see an example of the image i'm trying to process
  <a href="http://s13.postimage.org/knf9zvxee/vaflo.jpg" rel="nofollow">http://s13.postimage.org/knf9zvxee/vaflo.jpg</a></p>
  
  <p>What I am trying to get in this case is just the String "KND 486".
  So I need to isolate this from everything. You might notice that the string that I am looking for is the biggest one, and as it is a License plate from Argentina, it will always appear 3 letters and then 3 numbers.</p>
  
  <p>As you can see, I've tried to binarize the original picture, but I am not getting the results I expected. 
  Does anyone knows what else should I do?</p>