[Digikam-devel] Fwd: New GreyCstoration

[Gilles Caulier]

---------- Forwarded message ----------
From: Gilles Caulier <caulier.gilles at gmail.com>
Date: 12 mars 2007 16:14
Subject: Re: [Digikam-devel] New GreyCstoration
To: mbing at planet.nl

Restoration plugin ported into svn. I need help about to find Restoration
preset values. Look my commit message for details :

http://websvn.kde.org/trunk/extragear/graphics/digikamimageplugins/restoration/imageeffect_restoration.cpp?revision=641768&view=markup

Thanks in advance for your help

Gilles

2007/3/12, Mike Bing <mvoorberg at yahoo.com>:
>
>
>
> *Gilles Caulier <caulier.gilles at gmail.com>* wrote:
>
> I'm currently porting the code (:=)))
>
> I have just completed "Restoration" plugin at now. The speed is impressive
> (more than 3x : around 10x i think).
>
> I will finalize all source code during this week, including Inpainting and
> Blowup plugins.
>
> I will very appreciate all feedback about this port using current
> implementation from svn...
>
> I will post a commit message in this mailing list when the code will be
> ready to test.
>
> Gilles Caulier
>
> Gilles,
>
> Awesome news. I have sent David a very noisy 400ISO Canon 8Mp image to
> work with and its NeatImage output. He is currently working on getting
> similar results which might gives us some more insights to the correct
> values of the many switches.
>
> As for the speed increase, I'm happy to say I have at least contributed a
> bit there by suggesting to David he include tiling in the processing in
> order to minimize HDD swapping due to memory constraints. I sent him a proof
> of concept in the form of a bash script and he took up on that challenge
> ending up adding even more memory tweaks which resulted in the current
> situation.
>
> The parameter "-tile"  is important to tweak the memory footprint so I
> assume (and hope) it is a setting in the new restoration plugin?
>
> Mike Bing wrote:
> >
> > Do you have any tips on parameters for high-ISO noise? I use:
>
> > greycstoration -restore $X.jpg -dl 1.5 -sigma 3.0 -p1 0.1 -p2 0.9
> > -prec 3 -linear 0 -da 45 -dt   DT  -iter ITER  -visu off -o $X-nr.jpg
> > where I have the following presets:
> >
> >
>
> When you have high-iso noise, a good idea is to increase the '-alpha'
> parameter rather than the 'sigma' one. Actually, it is not very clear
> for me what set of
>  parameters are the best ones. I'm still trying to
>
> understand the exact role of each parameter, I mean not the
> mathematical
> meaning (I can explain this very well..) but the effect in terms of
> psychovision or something like this.
> That's unfortunately research work and a lot of open questions
>
> remain...
>
> Regards,
>
> David.
>
>
>
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