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What hills are you dying on?
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Actually even for qr codes the pixel count (or rather camera quality) makes a huge difference. Got a new phone last year with much better camera then previous. Suddenly during presentations i didn't need to awkwardly semi stand up and try to get closer. Just recognized the code immediately
I think it has more to do with compute speed. I have a trash camera but high-end CPU on my device, QR codes are instantaneous