[Octave-bug-tracker] [bug #44831] image package: imrotate - different dimensions of output matrix

[H. G.]

URL:
  <http://savannah.gnu.org/bugs/?44831>

                 Summary: image package: imrotate - different dimensions of
output matrix
                 Project: GNU Octave
            Submitted by: hardy
            Submitted on: Di 14 Apr 2015 11:29:04 GMT
                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: 3.8.2
        Operating System: Any

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Details:

Here is a simple script to show the behavior:


clear;
pkg load image;

M = [0 1 0; 0 1 0; 0 1 0];
imrot = imrotate(M, -45, 'nearest' , 'loose', 0)


The result of current Octave (3.8.2) and the imrotate function from the image
package (2.2.2 or 2.4.0) gives the following result with matrix size 4-by-4:


   0   0   0   0
   0   0   1   0
   0   1   0   0
   0   0   0   0


Matlab gives the following result, which has a different size of the output of
5-by-5:


     0     0     0     0     0
     0     0     0     1     0
     0     0     1     0     0
     0     1     0     0     0
     0     0     0     0     0


Both do use the same (default) type of interpolation method (nearest) and the
same extrapolation value (0). Those two values are only explicitly given in my
example script to work around bug #44794 for image-2.2.2.

Nevertheless the resulting matrix differs in size :(




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