Re: Alternative/Addition to using a CAPTCHA
| From: | Richard Lynch | Date: | Sun, 01 Apr 2007 07:00:58 +0000 |
| Subject: | Re: Alternative/Addition to using a CAPTCHA | ||
| References: | 1 | Groups: | php.general |
| Request: | Send a blank email to php-general+get-251865@lists.php.net to get a copy of this message | ||
On Fri, March 30, 2007 2:29 pm, tg-php@gryffyndevelopment.com wrote:
> For those of you not following, what tedd's done with is blue dot is
> created a larger image that contains a blue dot somewhere. You can
> click in a fairly wide area, but only clicking on the blue dot yields
> a success.
But it's probably not any harder to "crack" than the traditional
WORD_AS_IMAGE captchas -- One just has to write an algorithm to
edge-detect the blue circle instead of edge-detecting the letters and
converting them to ASCII.
Actually, edge-detecting the blue circle is probably easier, when you
get right down to it.
It's the same kind of basic "robot vision" that's covered in CS
Algorithms 101 class.
--
Some people have a "gift" link here.
Know what I want?
I want you to buy a CD from some indie artist.
http://cdbaby.com/browse/from/lynch
Yeah, I get a buck. So?