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A comment on Breaking the MintEye image CAPTCHA in 23 lines of Python.

Re:Breaking the MintEye image CAPTCHA in 23 lines of Python by StavrosK on Saturday January 19, 2013 @08:16AM (#5083306)
Very interesting article, and an insightful realization. I had no idea Sobel could do that.
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Re:Breaking the MintEye image CAPTCHA in 23 lines of Python by experiment0 on Saturday January 19, 2013 @11:28AM (#5083784)
What? Edge detection is pretty much the only use for the Sobel operator.

http://en.wikipedia.org/wiki/Sobel_operator

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