[KLUG Members] human vs bot

[Mike Williams]

Does anybody know why these things are so hard for an OCR program to 
handle?  I know the human eye has a much easier time with recognizing 
characters than a computer does, but with all the hardware we can throw 
at a problem, do a few lines scratched through the figure really confuse 
a computer that much?  I'm just imagining the screaming that will occur 
when somebody figures out a simple algorithm to strip out the lines.


> From:
> Bruce Smith <bruce at armintl.com>
>
>
>Not wanting to reinvent the wheel for a fairly standard piece of code
>these days, I'm wondering if anyone can point me to an example snippet.
>
>I want to verify that the data entered in a form was done by a real
>person, and not a bot.  I'm looking to add a graphic containing random
>numbers (and/or letters) that the person has to enter into a text box
>before they press SUBMIT.  Usually the graphic is obscured with lines
>and/or the characters are not evenly placed in the graphic.  (to mess
>with bots using OCR type readers, I assume)
>
>In the rare chance you haven't run across this, go to http://joker.com/
>type a domain name in the "SEARCH WHOIS" text box, and click "GO".
>
>Can anyone point me to some example PHP code to do this?  TIA!    :-) 
>
> - BS
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