[Octave-bug-tracker] [bug #62910] [octave forge] (image) bwslect(..., 4) in Octave behaves like bwslect(..., 8) in MATLAB and vice versa

[Avinoam Kalma]

URL:
  <https://savannah.gnu.org/bugs/?62910>

                 Summary: [octave forge] (image) bwslect(...,4) in Octave
behaves like bwslect(...,8) in MATLAB and vice versa
                 Project: GNU Octave
               Submitter: avinoam
               Submitted: Thu 18 Aug 2022 05:00:19 AM UTC
                Category: Octave Forge Package
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Matlab Compatibility
                  Status: None
             Assigned to: avinoam
         Originator Name: Avinoam
        Originator Email: 
             Open/Closed: Open
                 Release: other
         Discussion Lock: Any
        Operating System: Any


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Follow-up Comments:


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Date: Thu 18 Aug 2022 05:00:19 AM UTC By: Avinoam Kalma <avinoam>

Bug#50071 was "[octave forge] (image) bwfill(...,4) in Octave behaves like
bwfill(...,8) in MATLAB and vice versa".
This bug has been fixed.

But bwslect calls bwfill, and this fix was not good for bwslect.

For example, in MATLAB


>> img = [0,1,0;0,1,1;1,0,1]; A = bwselect(~img,1,1,4)
ans =

   1   0   0
   1   0   0
   0   0   0

>> img = [0,1,0;0,1,1;1,0,1]; A = bwselect(~img,1,1,8)
ans = 

   1   0   0
   1   0   0
   0   1   0


In Octave the results are the opposite.
I will prepare a patch to fix this








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