>If you wanted to do the cheap version of this you could probably set up a screen with proper lighting such that it'd line up well enough that screen and sensor

>If you wanted to do the cheap version of this you could probably set up a screen with proper lighting such that it'd line up well enough that screen and sensor pixels matched closely making it near if not completely impossible to tell a screen was involved. You could make things more difficult by using multiple cameras (and perhaps some other sensors) to detect a 3D scene rather than just a 2D representation, but I agree that it's all ultimately fakeable.