scipy.ndimage.morphology.binary_opening performance vs. cv2.morphologyEx

[Benny Lichtner]

Hey, all. I've been using scipy.ndimage.morphology.binary_opening on images 
around 15000 x 5000 in size (scans of old seismograms!). I did a quick 
comparison with open cv's cv2.morphologyEx and noticed the cv2 opening was 
about 10x faster.

Is this expected? I don't know much about how scipy and opencv differ under 
the hood. If unexpected, I'll take a closer look at the two.

(I was kindly pointed to this google group by folks replying to my github 
issue: https://github.com/scipy/scipy/issues/5333.)

--Benny
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