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I've already posted this question on Stackoverflow but that place is more specificly for question about programming, so here I am.

I've attended a Machine Learning course and, seeing some nice application about image recognition, I wonder what kind of stuff is used in recognizing what is written in a CAPTCHA. I've googled it and, as far as I understood, there is already a quite good arsenal to attack this problem. What is a good source to learn the most about?

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Short (and questionable) answer: if a CAPTCHA technique is broken, then a new one is created, so the research about breaking CAPTCHAs is pointless in some sense. (unlike cryptography, they don't care about sustainability) – jmad Jun 5 '12 at 6:20
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Human computing works like a charm. See also this old but excellent talk by Luis von Ahn. – Raphael♦ Jun 5 '12 at 11:20
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Note that crossposting is generally discouraged; you should wait some days and have the question migrated if no satisfactory answers have come forth. In this case, it seems you specificly want to have both points of views covered, so I guess it is ok. – Raphael♦ Jun 5 '12 at 11:24

closed as not a real question by Ran G., Pål GD, Raphael♦ Jan 28 at 10:07

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, see the FAQ.