[Octave-bug-tracker] [bug #52933] [octave-forge] (image) regionprops Perimeter returns incompatible results

[Carnë Draug]

URL:
  <http://savannah.gnu.org/bugs/?52933>

                 Summary: [octave-forge] (image) regionprops Perimeter returns
incompatible results
                 Project: GNU Octave
            Submitted by: carandraug
            Submitted on: Fri 19 Jan 2018 03:41:52 PM UTC
                Category: Octave Forge Package
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: Matlab Compatibility
                  Status: None
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
                 Release: other
        Operating System: Any

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Details:

In Matlab R2014a, regionprops started to use a different algorithm to compute
the Perimeter of objects:

> regionprops function uses new algorithm to calculate perimeter
>
> The regionprops function uses a new algorithm to calculate a perimeter, when
used with the 'Perimeter' option. Because of this change, regionprops returns
different results for the perimeter calculations than it did in earlier
releases.
>
>Compatibility Considerations
>
> While the new algorithm used with regionprops returns more accurate
perimeter calculation, you can get the same return value as previous releases
by specifying the 'perimeterold' option.

Octave's image package only implements their old method. There doesn't seem to
be any details on what the new algorithm does different or where the issue was
with the old one.




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