[gnuastro-devel] [bug #51372] NoiseChisel segfault when no usable region for sky clumps

[Mohammad Akhlaghi]

URL:
  <http://savannah.gnu.org/bugs/?51372>

                 Summary: NoiseChisel segfault when no usable region for sky
clumps
                 Project: GNU Astronomy Utilities
            Submitted by: makhlaghi
            Submitted on: Mon 03 Jul 2017 04:58:53 PM CEST
                Category: NoiseChisel
                Severity: 3 - Normal
              Item Group: Crash
                  Status: In Progress
                 Privacy: Public
             Assigned to: makhlaghi
             Open/Closed: Open
         Discussion Lock: Any

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Details:

It may happen that the number of usable pixels to define clumps over
un-detected pixels in some tiles are zero. 

However, the sky clump identification and S/N calculations aren't ready for
that. In such a case, at the start of segmentation, NoiseChisel would crash
with a "segmentation fault (core dumped)".

The particular case that this happend was when a large area of the
surroundings of the image were blank. So many tiles were blank. However, the
image and tile sizes resulted in some tiles only having one row of overlap
with the non-blank image. Since all pixels on the edge of a tile are not
considered in finding clumps over the sky region, the result was that there
were actually no usable pixels for sky segmentation within the tile.

This bug was reported by Raúl Infante Sainz and Nacho Trujillo.




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