I want to make an android (and maybe +iOS) app to quickly scan my custom MTG tokens

Needs: Autodetect of multiple high-contrast quadrilaterals in-frame & auto-snapshot when they're all in focus, then normalize the quads to playing card ratio

Mobile experts: what tools are out there for detection?

@grue Not a mobile expert, but did some AR work a while back and Vuphoria was the library of choice at the time. It appears to still exist. Don't know if it's still the best option.