[Octave-bug-tracker] [bug #41984] Package Image 2.2.1 (imsmooth)- bug into the Bilateral filter

[Marc Vivet]

URL:
  <http://savannah.gnu.org/bugs/?41984>

                 Summary: Package Image 2.2.1 (imsmooth)- bug into the
Bilateral filter
                 Project: GNU Octave
            Submitted by: marcvivet
            Submitted on: dj 27 mar 2014 22:54:16 GMT
                Category: Octave Forge Package
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Inaccurate Result
                  Status: None
             Assigned to: None
         Originator Name: Marc Vivet
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: 3.8.1
        Operating System: Microsoft Windows

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Details:

When using the function imsmooth configured to perform a Bilateral filter,
results in a shifted image.

For instance:

ima_out = imsmooth(ima_in, 'Bilateral', 2, 10);

where ima_in is the input image, 2 is the spatial sigma and 10 is the range
sigma.

This causes that ima_out is not aligned to ima_in.

The problem seems to be caused by the file __bilateral__.cc and the amount of
shift is proportinal to the spatial sigma for the X and Y axis.

It can be computed as <spatial sigma>*3 on the X and Y axes.





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