On 2/14/2014 9:40 PM, Nathan Wajsman wrote:
> Thanks. I think I will have another beer now.
You mean, ITIWHABN?
Or UCMPF*
ASFFS Moose
* Una Cerveza Mas, Por Favor
>
> Cheers,
> Nathan
>
> Nathan Wajsman
> Alicante, Spain
> http://www.frozenlight.eu
> http://www.greatpix.eu
> PICTURE OF THE WEEK: http://www.fotocycle.dk/paws
> Blog: http://nathansmusings.wordpress.com/
>
> YNWA
>
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>
>
>
> On Feb 14, 2014, at 6:53 PM, usher99@xxxxxxx wrote:
>
>> CFA--color filter array
>>
>> B to B--- blue to blue
>>
>> R to R----red to red
>>
>> POCS--"Projection onto convex set theory-"--see below excerpt from a
>> paper
>>
>> "Another effective approach of interpolating missing data in
>> chrominance channels is to borrow wavelet theory. Based on the
>> observation that edges across color channels are highly correlated, it
>> is possible to obtain a good estimation of high-frequency band
>> coefficients in chrominance from their luminance counterpart by simple
>> maxrule (13) or mean-corrected synthesis.(8) More systematic approach
>> is based on projection-onto-convex-set (POCS)theory.(21) By alternating
>> the projection onto observation and detail constraint sets, chrominance
>> channels canbe efficiently reconstructed after few iterations. Since
>> POCS-based demosaicing achieves good performance at the price of
>> moderate computational cost, it has been widely used as the benchmark
>> scheme for later works."
>>
>> Here is reference 21: FWIW
>>
>> http://imagenoise.googlecode.com/svn-history/r56/trunk/demosaick/Demosaicing/Demosaicing.pdf
>>
>>
>> Right now if ones uses a converter that avoids the watercolor effect
>> (this effect can be seen in that pinkish fabric from the standard
>> images on imaging resource) ---
>> the trade-off is that you can get these tiny, red-green speckle
>> artifacts in very high contrast areas, particularly with specular
>> highlights.
>>
>> Relatively subtle issues except at near 100% viewing though might
>> bother some especially landscape photogs that like to print large.
>>
>> Point is that there should be a computational way to mitigate if not
>> eliminate the issues. DXO (from a company rep at a show) had looked at
>> the issue and for now decided ( deduced from their forum) waaaay too
>> much work to make it a commercially viable project right now to add to
>> DXO optics pro.
>> (also might take 5min to process a raw file)
>>
>> Am in shopping mode and seemed to get distracted (Indeed totally lost)
>> down some side streets.
>>
>> ARU, Mike (abbeviations are us)
>> --
>> _________________________________________________________________
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>> Themed Olympus Photo Exhibition: http://www.tope.nl/
>>
>>
--
What if the Hokey Pokey *IS* what it's all about?
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