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

As you can see, it cannot get any easier than this.

On a different note, the first Q1 2010 Service Pack release for our ASP.NET AJAX controls is out now. The RadCaptcha control received an update to its audio feature - the control will attempt to play the audio file directly in the browser via HTML5 audio or the QuickTime plug-in where available. You can "hear" the difference on our updated online demos.


About the Author

Iana Tsolova

is Product Manager at Telerik’s DevTools division. She joined the company back in the beginning of 2008 as a Support Officer and has since occupied various positions at Telerik, including Senior Support Officer, Team Lead at one of the ASP.NET AJAX teams and Technical Support Director. Iana’s main interests are web development, reading articles related to geography, wild nature and latest renewable energy technologies.

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