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From wikipedia

reCAPTCHA is a system ... that uses CAPTCHA to help digitize the text of books while protecting websites from bots

I have a lot of scanned documents that I'd like to convert, and would like to introduce a captcha on my website, so why not kill two birds with one stone?

The reCAPTCHA project has it's own agenda though focusing on archives of The New York Times and books from Google Books.

Does a similar project exist that I could host and thereby dictate the books/docs that are digitised?

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This question is constructive but off topic. It is an exact duplicate of a question on Stack Overflow that predates our site. See this question, stackoverflow.com/questions/244179/… –  RandomBen Oct 7 '11 at 13:45
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@RandomBen I think Craig's looking for a way to use a CAPTCHA-like system to digitise books, not to validate user input (as in that SO question). –  Nick Oct 7 '11 at 13:50
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@Craig My advice would be to use Google's own Optical Character Recognition system to upload your images and convert them to text on the fly (demo and more info). A self-hosted CAPTCHA system would be too slow to convert whole books. reCAPTCHA is only employed to use humans to convert unknown words, not whole documents. –  Nick Oct 7 '11 at 13:50
    
@Nick Correct I'm not looking for a general open source captcha system. –  Craig Oct 7 '11 at 13:57
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@paulmorriss The page you linked to says that the books are first scanned and digitised using OCR, then "reCAPTCHA improves the process of digitizing books by sending words that cannot be read by computers to the Web in the form of CAPTCHAs for humans to decipher." I think the whole point is to translate words OCR can't handle. –  Nick Oct 7 '11 at 14:15

1 Answer 1

Use Google's OCR to digitize those books. As for using your own books to translate, there isn't currently third-party software available for that. For added reasoning against this, an excerpt from the CAPTCHA Site;

Should I Make My Own CAPTCHA?

In general, making your own CAPTCHA script (e.g., using PHP, Perl or .Net) is a bad idea, as there are many failure modes. We recommend that you use a well-tested implementation such as reCAPTCHA.

Further, he spoke at a TED conference on the subject of reCAPTCHA. If you do infact intend on making your own, might as well study up.

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