On Fri, March 30, 2007 2:29 pm, tg-php@xxxxxxxxxxxxxxxxxxxxxx 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? -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
