[task #16056] NoiseChisel take a mask image for pixels to ignore

[Mohammad Akhlaghi]

URL:
  <https://savannah.gnu.org/task/?16056>

                 Summary: NoiseChisel take a mask image for pixels to ignore
                 Project: GNU Astronomy Utilities
            Submitted by: makhlaghi
            Submitted on: Sat 16 Oct 2021 12:55:59 AM BST
         Should Start On: Sat 16 Oct 2021 12:00:00 AM BST
   Should be Finished on: Sat 16 Oct 2021 12:00:00 AM BST
                Category: NoiseChisel
                Priority: 5 - Normal
              Item Group: Enhancement
                  Status: None
                 Privacy: Public
        Percent Complete: 0%
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
                  Effort: 0.00

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Details:

Currently, the only way for NoiseChisel to ignore some pixels in an image is
to set them to NaN before calling NoiseChisel. While this is an easy operation
with something like Gnuastro's Arithmetic program, in a large pipeline, it is
slow (a whole new 32-bit floating-point image has to be created), and will
just add to its complexity. 

For pipeline scenarios, it is better to simply have their masks as an unsigned
8-bit integer (with value 1 for pixels to ignore and 0 for pixels to use) and
feed that along with the original image to NoiseChisel (such mask images can
also be wonderfully compressed, so their size will also be very
insignificant).  

Upon reading the input data, NoiseChisel can simply read the mask image also
and set all the masked pixels to NaN internally (before any operation). In
this way no later part of the programs above need to be changed.

So NoiseChisel (and other data analysis programs like Statistics, Segment,
MakeCatalog) should have a '--mask' option to allow the 

This task was defined after a discussion with Sylvain Mottet.




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