Re: Warped Text...

[Pier Fumagalli]

On 3 Sep 2005, at 15:22, Tony Collen wrote:

Pier Fumagalli wrote:

On 2 Sep 2005, at 16:23, Gianugo Rabellino wrote:

On 9/2/05, Pier Fumagalli <[EMAIL PROTECTED]> wrote:

Guys,

user is really in front of the browser (no automatons allowed). I

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.

for one of our registration projects, we needed to verify that a wrote, then, a little "text-warper" that randomly stretches text for

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.

http://cocoon.zones.apache.org/daisy/documentation/blocks/captcha.html

As Sylvain said, this can replace the default "gaussian blur" for the Captchas... I've now committed it as its own block in the 2.1.x branch, so feel free to test it out, and if someone is into CFORMs (ping Ross, where are you - my minions are nowhere to be found on a Sunday night! :- D ), we can try to replace the SVG->Blur->IMAGE with this little Reader. Anyhow, samples are in there, both for a simple CAPTCHA flow and for a more generic showcase of what the CaptchaReader is capable of (not much, but it's all there). As for the "validation" block, the documentation is in Daisy (one gotta love that little piece of junk, makes documenting so easy): http://cocoon.zones.apache.org/daisy/documentation/components/readers/ captchareader.html

Have fun...

    Pier

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