use headless opencv

[abe-winter]

Warning ⚠️

I didn't test this (I don't know how)

What changed

• use opencv-headless instead of the full version
• misc cleanup to simplify build

Why

Currently, we install the full version of the opencv python library, which on ubuntu has apt-get dependencies that are not always present (causing the pyinstaller binary to fail to start). Headless seems to fix that. Headless also likely produces smaller binaries (but I didn't check).

⚠️ warning, there may be missing features at runtime from switching from full opencv to headless.

Alternatives

Create a run.sh wrapper which detects the platform and does apt installs where necessary

[penguinland]

Dang, this is, like, 6 months old and nobody has looked at it. Abe, do you still want someone to look at this? If so, fix the merge conflicts and assign me as a reviewer.

[abe-winter]

your call if this is useful -- if yes I will fix up for merge, if not I'll close

the headless version of opencv has fewer system library dependencies and is easier to install

[penguinland]

I talked with Khari: we both think this is useful! Clean it up, and I'll make sure it works on both an Orin Nano and a Raspberry Pi, and we'll go from there.

[abe-winter]

fixed merge conflict but the dist/main produced by pyinstaller seems nonfunctional -- closing this as low pri. feel free to reopen and tinker if you want