Now a days text recognition within image is possible.
For example in Microsoft onenote you can search a text in image. So is it a chance for bots to tweak the CAPTCHA ?
By using the same technique can bots answer some CAPTCHA.

  • part of the question belongs to Super User and rest is argumentative rather than a question. – Shamim Hafiz Jun 19 '11 at 17:50
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    @Gunner: have removed the argumentative part.Thanks :) – Ajinkya Jun 19 '11 at 17:58

In case you haven't noticed, the text is usually visually garbled and mutilated to make it difficult/impossible for OCRs to work in CAPTCHAs. Non-altered, straightly rendered texts are easy to OCR out. But of course the recognition gets better and better. The race is on, but as humans suffer from difficult texts as well, new approaches are preferable.

  • Ya I observed that many texts are either too simple or too difficult to recognize. – Ajinkya Jun 19 '11 at 18:00
  • Some strings are so congested that, a human user has no option but to enter a wrong try or click "Try another". – Shamim Hafiz Jun 20 '11 at 5:32


Read there. Not to mention, they also convert scanned books to highlightable digital books by having a sample of users decode the same captcha.

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    I was unaware of this. Is it legal/ ethical ? – Ajinkya Jun 19 '11 at 18:03
  • @Ajinkya: Surely not ethical, even though it could be legal. – Shamim Hafiz Jun 20 '11 at 5:31
  • did you mean google.com/recaptcha ? They're digitising old texts to make them freely available on the internet, I wouldn't say it's unethical at all. – stib Jan 23 '14 at 6:43

Of course the captcha can be deciphered by bots , google's reCaptcha is the work of bots, the bot generates the captcha images it cannot decipher while digitizing real books and then throws it at humans to decipher it . They are continually modifying the code to obscure the text making it more difficult for bots to decipher. But eventually bots do catchup , afterall recaptcha is the work of a bot reading scanned text :)

  • Yes, reading the contents of regular font text is quite trivial, but those present on Captcha are deliberately garbled as much as possible. – Shamim Hafiz Jun 20 '11 at 5:35

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