title: vehicle number plate verification issue
body: <p>I am developing an automatic number plate verification system. I have managed to locate the number plate area(rectangles) on the vehicle image but I need to filter out the non-number plate rectangular areas on the image.</p>
  
  <p>I am using criterias such as</p>
  
  <ol>
  <li><p>Minimum number plate width x height so that smaller non-number plate areas can be filtered out</p></li>
  <li><p>Number plate width/ height ratio </p></li>
  </ol>
  
  <p>these two criterion has helped me reduce the number of non number plate areas. but still I have a few candidate regions which are not number plate areas. Can someone suggest me some criteria that i could use to return the exact number plate region.</p>
  
  <p>I am using C# and aforge.net</p>
  
  <p>Thanks</p>