[yuvalr1]

A completely different approach that don't require heavy AI would be an app on the user phone that does this:

1. Measure the distance from the wall (standard image processing)

2. Use the rotations of the gyro sensors on the phone to conclude which car is being looked at

I wonder if this could be as accurate though

[mrbombastic]

You could definitely cheat a little with something like this or geofences, but that requires the photos stay in the same place or the museum updates whenever they move.