[CREATE] Lens correction database

[Pablo dAngelo]

Hi all,

sorry for not beeing more present here at the moment, but I'm moving to another city right now, and have only very limited internet access.

I'm following the debate and will hopefully comment a bit more on the models in the near future. The k1*r^3+k2*r^5 model is a very standard and proven model and should be included. I need to look at that other model that has been mentioned in a earlier email.

Btw. for very fast processing of multiple images (video stream), it is very practical to precompute the distortion (and even the interpolation coefficients) for every pixel.

ciao
  Pablo

> -----Ursprüngliche Nachricht-----
> Von: Andrew Zabolotny <zap at homelink.ru>
> Gesendet: 23.08.07 20:56:17
> An: create at lists.freedesktop.org
> Betreff: Re: [CREATE] Lens correction database


> 
> From Thu, 23 Aug 2007 08:27:48 +0200
> Gerhard Kulzer <gerhard at kulzer.net> wrote:
> 
> > I have a seemingly stupid question: If we settled for the 5th order
> > model but used the 4th order data until our DB would fill up, then we
> > also can used the fast 3rd order preview mode? Since the 3rd order is
> > available in both models.
> The fast algorithm can be implemented only for the
> 
> rd = k1 * ru^5 + k2 * ru^3
> 
> model; a particular case is when k1 == 0 so you have just k2 * ru^3.
> However I don't quite get it how you're going to get the 3rd or 5th
> order "fast" model from 4th order data... Keep in mind that this is an
> incomplete 5rd order polynom, e.g. fast implementation is possible only
> if in the equation below c4 == c2 == 0:
> 
> rd = c5 * ru^5 + c4 * ru^4 + c3 * ru^3 + c2 * ru^2 + c1 * ru
> 
> -- 
> Andrew
> 
> 
> <hr>
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> http://lists.freedesktop.org/mailman/listinfo/create
> 
> 


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