Very interesting article, and an insightful realization. I had no idea Sobel cou... | Hacker News

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		stavros on Jan 19, 2013 \| parent \| context \| favorite \| on: Breaking the MintEye image CAPTCHA in 23 lines of ... Very interesting article, and an insightful realization. I had no idea Sobel could do that.

experiment0 on Jan 19, 2013 [–]

What? Edge detection is pretty much the only use for the Sobel operator.

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

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