[bug #67989] (Image) Octave image ordfilt2 is slower than matlab

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Follow-up Comment #4, bug #67989 (group octave):

I think `selnth` is the problem.

What is matlab's and if possible Octave's (on the same computer)  time for

ordfilt2(Img(:,:,1), 25, true(7,7));


?

Dmitri.
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