Aaarrrrrrggghhhh! Spent all day trying to get my head around the differences between the two versions of the Python wrappers for OpenCV. Basically, the old version is contained within the new wrapper. So for the new version:

import cv2 as cv

but for the old version – that works with all the tutorials online! – use:

import as cv

Grrrr – can’t believe it took me that long to work it out.


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