I was wondering if anyone knew about Mathematics involved in Captcha Solvers. I'm not interested in spamming, I just it would be interesting to see how to classify letters. I'm certain homology is used to determine the holes of the letter. I also figure that a line is connected only if at least a certain number of pixels are next to each other.
Mathematics involved in Captcha Solving
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algebraic-topology
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2You may be better off asking on another forum. I get the impression [computer vision](http://en.wikipedia.org/wiki/Computer_vision) uses general machine learning techniques more than algebraic topology, really... – 2012-08-20
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0Hmm... maybe some neural network thingie, which will read zip codes off envelopes? – 2012-08-20
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0I agree with Zhen Lin. Notice that captchas tend to be blurred and contain a lot of noise and chopped up letters. I *really* think it belongs to cs.stackexchange.com/ (rather than here, anyhow). I know next to nothing about algebraic topology, but taking into account the multitude of fonts and distortions possible, I think it would be near-impossible to develop an algebraic tool to crack any real captcha. – 2012-08-20