4
$\begingroup$

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.

  • 2
    You 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
  • 0
    Hmm... maybe some neural network thingie, which will read zip codes off envelopes?2012-08-20
  • 0
    I 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

1 Answers 1