[Octave-bug-tracker] [bug #33290] "fspecial" produces NA-results with the "motion" filter shape when its orientation parameter does not equal null

[fidelcastro]

URL:
  <http://savannah.gnu.org/bugs/?33290>

                 Summary: "fspecial" produces NA-results with the "motion"
filter shape when its orientation parameter does not equal null
                 Project: GNU Octave
            Submitted by: transsilvanien
            Submitted on: Mi 11 Mai 2011 14:22:44 GMT
                Category: Libraries
                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: 3.4.0
        Operating System: Other

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Details:

The function fspecial from the image package produces wrong results for the
"motion" filter shape.

When the first parameter is set to "motion" and when the third parameter which
then represents the orientation of the motion is set to something other than
null degrees, then the resulting matrix only contains NA elements.

I have experienced this problem on a Cygwin installation.

Here is an example:


psf = fspecial("motion", 5, 0)
psf =

    0.0 0.0 0.0 0.0 0.0
    0.0 0.0 0.0 0.0 0.0
    0.2 0.2 0.2 0.2 0.2
    0.0 0.0 0.0 0.0 0.0
    0.0 0.0 0.0 0.0 0.0


This is exampl produced correct results, but when I change the orientation
parameter to 10 degrees, then


psf = fspecial("motion", 5, 10)
psf =

    NA  NA  NA  NA  NA
    NA  NA  NA  NA  NA
    NA  NA  NA  NA  NA
    NA  NA  NA  NA  NA
    NA  NA  NA  NA  NA


the returned matrix only contains NA elements. I would expect a correctly
interpolated motion matrix here.




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