Oh yeah, that's way more than I need ;) I just have some control points
that need to be made into a curve to correct the different quadrants of
the image like the manufacturer expects them to be.
On the bright side, I did a quick hacky implementation today by making
the "curve" just a series of line segments in between the control
points, and the results are looking great. Visible seams totally
disappeared from my images. So now I just need to implement an _actual_
curve function and I'll have something I can submit.
On 11/29/2017 06:04 PM, Aurélien PIERRE wrote:
Some doc if you want :
https://www.researchgate.net/publication/224711059_Colour_Filter_Array_Demosaicking_using_Cubic_Spline_Interpolation
Although I'm not sure it is what you are looking for. But the results
look good.
*Aurélien PIERRE*
aurelienpierre.com <http://aurelienpierre.com>
------------------------------------------------------------------------
Le 2017-11-29 à 10:33, Roman Lebedev a écrit :
On Wed, Nov 29, 2017 at 6:19 PM, Robert Bieber<d...@biebersprojects.com> wrote:
On 11/29/2017 02:13 AM, Roman Lebedev wrote:
and RawSpeed is LGPL2. so that not is even an option.
Ahh, good point.
1. Will any of those curve_tools functions in DT do what the cubic_spline
function in dcraw (reproduced below for reference) does? I'm not really
familiar with calculating curves, but I'm a bit worried that it seems
like
they're all geared towards interpolating a single point on a curve, which
I'm assuming would be very slow compared to the approach dcraw takes of
calculating all the points on the curve and then just doing a lookup for
each pixel.
Let's not do premature optimizations :)
Implement the most dumbest/simplest variant, that is actually readable,
then i'll add tests and a benchmark; and *then* a specialized, faster
implementation *may* be added.
So I should implement cubic spline from scratch? I'll have a go at it,
what's the worst that could go wrong? ;)
Well, to put it another way, that dcraw cubic_spline() is just plain hideous.
I don't feel like merging it as-is just so that i will have to
remplement it soon after.
Thanks,
Robby
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