hi,
a few modules have similar requirements. you can have a look for
instance in the ashift.c module, where it says:
// only for preview pipe: collect input buffer data and do some other
evaluations
if(self->dev->gui_attached && g && piece->pipe->type ==
DT_DEV_PIXELPIPE_PREVIEW)
{
there is a 2nd pipeline, the preview pipe, which runs on the full
image but downscaled resolution (it's what you see when you pan the
image zoomed in in darkroom mode).
cheers,
jo
On Fri, Feb 17, 2017 at 11:47 AM, Heiko Bauke <heiko.ba...@mail.de> wrote:
> Hi,
>
> as I recently mentioned I am working on an automatic haze removal module for
> darktable. Adopting the useless module I added a new module to the
> correction group and placed this new module into an appropriate place in the
> pixel pipe. The only missing part is the actual implementation of the
> process method. Here, I got stuck with the following problem:
>
> A central step in automatic haze removal is to estimate the color and
> intensity of the global diffuse background light. This is done by
> estimating the amount of haze in each pixel by investigating the local
> neighborhood of each pixel. Then the 2%, let's say, brightest pixels among
> the 2% of the most hazy pixels of the whole image yield the global diffuse
> background light. The problem now is that, only some region of interest is
> accessible in the process function, but I need access to the whole (possibly
> scaled) image data. Thus, my question is how can I extract global image
> features in the pixelpipe?
>
> If I would determine the global diffuse background light just on the basis
> of the region of interest the result of the haze removal process would
> depend on the chosen image section in the darkroom preview, which is very
> undesirable.
>
>
> Heiko
>
> --
> -- Number Crunch Blog @ https://www.numbercrunch.de
> -- Cluster Computing @ http://www.clustercomputing.de
> -- Professional @ https://www.mpi-hd.mpg.de/personalhomes/bauke
> -- Social Networking @ https://www.researchgate.net/profile/Heiko_Bauke
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