[gnuastro-devel] [bug #52327] NoiseChisel leaving some regions unlabeld after clump growth

[Mohammad Akhlaghi]

URL:
  <http://savannah.gnu.org/bugs/?52327>

                 Summary: NoiseChisel leaving some regions unlabeld after
clump growth
                 Project: GNU Astronomy Utilities
            Submitted by: makhlaghi
            Submitted on: Wed 01 Nov 2017 09:51:44 PM CET
                Category: NoiseChisel
                Severity: 3 - Normal
              Item Group: Output not reasonable
                  Status: In Progress
                 Privacy: Public
             Assigned to: makhlaghi
             Open/Closed: Open
         Discussion Lock: Any

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Details:

When doing the final growth of true clumps, NoiseChisel currently uses
4-connectivity to expand the clumps. However, we have defined the detections
using 8-connectivity. 

As a result, I just found some rare cases where the detection had an
8-connected region to the main body with no true clump in it. As a result, it
was left unlabeled after the final growth and would somehow get a wrong label
(similar to another object in a completely separate part of the image).

I am now working on the fix...




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