NYCPHP Meetup

[David Mintz]

Fascinating. Initially I was thinking, oops, bad form, I shoulda googled
before I asked "what's a Captcha." But WTF, this is too interesting. What
a demented/delightful cat-and-mouse dynamic.

On Tue, 10 Feb 2004, Joel De Gan wrote:

> > what's a Captcha?
>
> Captcha is an image verification.
> it is supposed to stop bots, but there are quite a few people who write
> anti-captcha programs (I have had to do some for my work to get around
> images)
> Here is one I made for my email whitelist that is very effective in
> keeping spam out of my inbox
> http://lucifer.intercosmos.net/mail/
>
> The source is on the main site for creating them in php.
>
> to get around them you can utilize a program called gocr
> (gocr.sourceforge.net) which is a very easily trainable commandline
> program that output the OCR chars from an image. You can get around
> colors using imagemagik 'convert' and lines are easily removed be
> converting an image to black and white, then placing into a
> multi-dimensional array in php and identifying vertical and horizontal
> lines and removing them.
>
> it is pretty easy, here are some functions for doing it.
<snip />


---
David Mintz
http://davidmintz.org/

        "Anybody else got a problem with Webistics?" -- Sopranos 24:17