Create a pytest helper to aid users in running tests against directories of images

[virtuald]

Ideally, if your image processing code were structured correctly, such a helper would allow you to compute scores for each image and compare them to known values, so that as you improve your image processing code you can be assured that you haven't broken other cases you're tuning for.

There's a lot of boilerplate for this sort of thing, would be useful.

[mcolinj]

openCV permits you to open a directory full of images as if it were a capture device and it "captures" then one by one in lexical order.

[virtuald]

Oh? That sounds pretty cool, would be a good thing to build around then!