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

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Follow-up Comment #5, bug #67989 (group octave):

Octave image ordfilt2 time is not greatly affected by the min/mean/max
selection. They are all around 7.5 to 8.5. "25" is higher. 

>> tic;ordfilt2(Img(:,:,1), 1, true(7,7));;toc
Elapsed time is 7.58806 seconds.
>> tic;ordfilt2(Img(:,:,1), 25, true(7,7));;toc
Elapsed time is 8.4012 seconds.
>> tic;ordfilt2(Img(:,:,1), 49, true(7,7));;toc
Elapsed time is 7.76185 seconds.

ML's number is still around 0.1-0.2 sec.  In general, for reference purpose,
the numbers in my original post are still valid. ML is 20x plus faster
regardless uint8 or double.  

Not sure if this helps.


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