[Octave-bug-tracker] [bug #53309] imrotate of +/-90 degrees results in black image when 'crop'

[Tis Veugen]

URL:
  <http://savannah.gnu.org/bugs/?53309>

                 Summary: imrotate of +/-90 degrees results in black image
when 'crop'
                 Project: GNU Octave
            Submitted by: tis
            Submitted on: Fri 09 Mar 2018 03:08:17 PM UTC
                Category: Octave Function
                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: 4.2.1
        Operating System: Microsoft Windows

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Details:

The following command fails:
rotated_image = imrotate( input_image, 90, 'nearest', 'crop' );
For an input RGB image the result is a black image with a 3x3 red dot in the
middle.
I checked the failure for several type of input_image's: uint16 or double; 1
channel or 3 channels.
The problem also occurs when rotation angle is -90 degrees.
No problem happens when command is without the 'crop':
rotated_image = imrotate( input_image, 90, 'nearest' );

Probably, there is an optimization for +/-90 degrees that sucks.




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