title: Image preprocessing for text recognition
body: <p>What's the best set of image preprocessing operations to apply to images for text recognition in EmguCV? </p>
  
  <p>I've included two sample images <a href="http://notsonerdygeeks.onlyatbits.com/upload/sample.png">here</a>.</p>
  
  <p>Applying a low or high pass filter won't be suitable, as the text may be of any size. I've tried median and bilateral filters, but they don't seem to affect the image much.</p>
  
  <p>The ideal result would be a binary image with all the text white, and most of the rest black. This image would then be sent to the OCR engine.</p>
  
  <p>Thanks</p>