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From Tony Collen <colle...@umn.edu>
Subject Re: Warped Text...
Date Sat, 03 Sep 2005 14:22:55 GMT
Pier Fumagalli wrote:
> On 2 Sep 2005, at 16:23, Gianugo Rabellino wrote:
> 
>> On 9/2/05, Pier Fumagalli <pier@betaversion.org> wrote:
>>
>>> Guys,
>>>      for one of our registration projects, we needed to verify that a
>>> user is really in front of the browser (no automatons allowed). I
>>> wrote, then, a little "text-warper" that randomly stretches text for
>>> a user to see (and re-type) and writes out JPEG files.
>>>
>>> In addition to that I wrote a little random-text generator and
>>> encryptor (so that you can be sure the text displayed is nowhere in
>>> your HTML). An example of a generated image is attached here.
>>>
>>
>> Did you look at what Ugo did with captchas?
>>
>> http://agylen.com/2005/05/16/captcha-validator-for-cocoon-forms/
>>
>> Ciao,
> 
> 
> Yep, but SVG IMVHO is quite overkill to generate a simple image...  Plus 
> I suspect that the blurring algorithm is quite easy to recognize  (in 
> terms of running a simple image analysis package over the  generated 
> output).
> 
> I kinda like more random things! :-P :-P
> 
>     Pier
> 


Ugo's work built on some stuff I did a long time ago.  I did a gaussian 
blur on the text just as a proof of concept.  Of course, the SVG filters 
have displacement maps, so ideally you'd add one in addition to the 
stuff that's already there.


Tony

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