On Wed, Feb 26, 2014 at 7:04 PM, Gert van der Plas - Schrama <
gertvdp...@gmail.com> wrote:
> Run times. Time complexity is O (1)
>
in the number of pixels? impressive. i was more interested in output of
`darktable -d perf' in milliseconds for example.
j.
> for stagger. No clue for igv. But its not perceptible slower than ppg or
> amaze on my first generation mobile i7 using OpenMP.
>
> Best,
>
> Gert
> Op 26 feb. 2014 14:16 schreef "johannes hanika" <hana...@gmail.com>:
>
>> 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 <
>> gertvdp...@gmail.com> 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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>>
>>
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