[gnuastro-devel] [task #15245] weight-mean operator in astarithmetic

[Raul Infante-Sainz]

URL:
  <https://savannah.gnu.org/task/?15245>

                 Summary: weight-mean operator in astarithmetic
                 Project: GNU Astronomy Utilities
            Submitted by: infantesainz
            Submitted on: Thu 25 Apr 2019 06:42:20 AM UTC
         Should Start On: Thu 25 Apr 2019 12:00:00 AM UTC
   Should be Finished on: Thu 25 Apr 2019 12:00:00 AM UTC
                Category: Arithmetic
                Priority: 5 - Normal
              Item Group: New feature
                  Status: None
                 Privacy: Public
        Percent Complete: 0%
             Assigned to: None
             Open/Closed: Open
         Discussion Lock: Any
                  Effort: 0.00

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Details:

One of the main operations in data reduction is the stacking of images. There
are situations where some images has to be more weighted than others. For
example, in a set of images, if some of them has high noise, it would be
better to weight less that images. Another situation is when images have
different time exposures, those with high time exposure should be weighted
higher, while those with low time exposure should be less weighted.

One possible way could be to define `weight-mean' operator that takes as input
pairs of images and weights. Something like this:

<textarea>
astarithmetic im1.fits 0.5 im2.fits 0.8 im3.fits 0.1 3 weight-mean
--output=stacked.fits
</textarea>






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