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From Tony Collen <>
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 <> 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?
>> 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.


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