[Octave-bug-tracker] [bug #51719] image: watershed unit test failure

[Rafael Laboissiere]

URL:
  <http://savannah.gnu.org/bugs/?51719>

                 Summary: image: watershed unit test failure
                 Project: GNU Octave
            Submitted by: rlaboiss
            Submitted on: Thu 10 Aug 2017 07:12:54 AM UTC
                Category: Octave Forge Package
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Incorrect Result
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: other
        Operating System: GNU/Linux

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Details:

Using Octave 4.2.1 and package image 2.6.1, the following unit test in
watershed:


## The following test is required for Matlab compatibility.  There must be
## something specific about their implementation that causes it to return
## this value.  Even when solving it on paper, we get different results.
%!test
%! im = [
%!     2     3    30     2
%!     3    30     3    30
%!   255    31    30     4
%!     2   255    31    30
%!     1     2   255     5];
%! 
%! labeled8 = [
%!     1     1     0     3
%!     1     1     0     3
%!     0     0     0     0
%!     2     2     0     4
%!     2     2     0     4];
%! assert (watershed (im), labeled8);


fails with the following message:


error: ASSERT errors for:  assert (watershed (im, 8),labeled8)

  Location  |  Observed  |  Expected  |  Reason
   (3,4)          3            0         Abs err 3 exceeds tol 0
   (4,4)          0            4         Abs err 4 exceeds tol 0
octave:74> assert (watershed (im), labeled8)
error: ASSERT errors for:  assert (watershed (im),labeled8)

  Location  |  Observed  |  Expected  |  Reason
   (3,4)          3            0         Abs err 3 exceeds tol 0
   (4,4)          0            4         Abs err 4 exceeds tol 0





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