Hi Johannes,
I am mostly mobile online. And nearly all of my communications is async. So
irc is not really an option. I mostly snatch here and then 15-30 minutes
coding time. On demosaic algo's, their just different and performance
really depends on camera and noise levels. These are just some simple
examples.
Again a Dropbox link. This time with some samples for amaze, igv and
stagger. With and without the denoising profile on color enabled. Images
are best viewed at 200%.
Mijn main reason for adding the demosaic codes is that sufficient
enlargments will show the mosaic structures from amaze and ppg. With pgg
worse than amaze.
https://www.dropbox.com/sh/mzb6mf02u0b96du/dZdwnW9WF4
Pleae also note the green spikes caused by the denoising profile on color
in some images. Here some stuff seems to go boom.
Cheers,
Gert
P.S. If someone has an article reference for the amaze algorithm I'd
appreciate it.
Op 26 feb. 2014 14:16 schreef "johannes hanika" <[email protected]>:
> hey,
>
> nice, sounds like you're having fun with those demosaicers..
>
> could you upload a small set of comparison images illustrating why you
> think one algo is better than the other, just so we all know what you're
> talking about? preferably with run times.
>
> doxygen, really? do people still do that? the best documentation you'll
> get is #darktable on freenode.
>
> -jo
>
>
>
> On Wed, Feb 26, 2014 at 12:00 PM, Gert van der Plas - Schrama <
> [email protected]> wrote:
>
>> Hi,
>>
>> I branched darktable on github and created a branch named
>> demosaic-algos for version 1.5. I've added two 'experimental' demosaic
>> codes for high noise situations. I have not yet added border
>> interpolation and plan to drop the unused pixels to prevent
>> differences in demosaic rendering. IGV is pretty powerful.
>>
>> - igv with OpenMP support from rawtherapee. Suitable for high noise,
>> i.e. for the Sony NEX-C3 suitable for 1600 iso, 3200 iso and 6400 iso,
>> about 90 minutes work to port.
>> - stagger with OpenMP support, home-brewed. Suitable for very high
>> noise, i.e. for the Sony NEX-C3, under exposed 6400 and 12800 iso
>> shots.
>>
>> I might port more demosaic codes from RawTherapee but amaze and igv
>> seem to give the best results for my camera. Most likely I am
>> interested in adding newer more advanced demosaic codes that perform
>> better than amaze.
>>
>> People who are interested in the algorithms and want to give feedback
>> can go here and pick a commit that is not mentioned to be broken.
>>
>> https://github.com/digitalmole/darktable/tree/demosaic-algos
>>
>> some things one should now:
>>
>> - Currently there is no border interpolation, border pixels are simply
>> as allocated from memory.
>> - Stagger. It does not smooth color noise, it leaves it to the
>> profiled denoising module to remove them. The edge threshold slider is
>> used to enable 'green edge awareness'. Slide it to the left to
>> increase edge-awareness and increase noise. About 0.2-0.3 are nice
>> values for the Sony NEX.
>>
>> Feedback and advice is welcome. Particular on any pitfalls I might
>> encounter.
>>
>> Cheers,
>>
>> Gert
>>
>>
>> --
>> Panta Rhei -- Life is a dance
>>
>>
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