Fun with RadCaptcha for ASP.NET AJAX and OCR software

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Published on Tue, 20 Apr 2010 00:00:00 GMT Indexed on 2010/04/20 16:54 UTC
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A friend of mine was evaluating OCR software and finally decided to go with FineReader. I was curious what would happen if we put the RadCaptcha control in. Will the advanced OCR manage to decode it or not? At first he showed me a test run with the RadCaptcha demo description, to get an idea of the basic output:

 Recognized Image

 Naturally, the captured description text was no problem - only a few characters were misread but then corrected with the spellcheck. Next, the real test was performed:

CAPTCHA test 1  CAPTCHA test 2

 These were only a couple of the results, but there is no need to post the rest of the tests - none of the RadCaptcha images were recognized by the OCR software. Here are the CaptchaImage settings used in the tests:

  • Background Noise Level: Low /default value
  • Line Noise Level: Low /default value
  • Font Warp Factor: Low /Medium is default value...

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