[cyode]

Bit off-topic: can anyone recommend resources (videos/papers/tutorials) that could help me learn how QR barcode detection and scanning itself is implemented?

I've been thinking that building a basic scanner from scratch (i.e. only using vanilla cpp/python/whatever + image processing libraries, but nothing barcode-specific) could teach me a lot.

[lgvld]

I guess it helps to understand how to generate a QR code: https://www.nayuki.io/page/qr-code-generator-library (see also the references at the end)

Good luck. ;-)