I had this running on Android a while back - turns out that back then (~3 years ago) it was _very_ hard to detect and recognise plates far enough away to be of any use. I could make it work for a plate in my target set that was directly in front or behind me, but any further that a few tens of meters away the performance dropped so badly that it was unusable.<p>I suspect a much better job could be done now, with a combination of better cameras in phones, more cpu available to do the processing on newer phones, and I suspect a multicopter brushless camera gimbal to stabilise&#x2F;aim the camera.<p>(I was very space-limited, since I was testing this on a motorcycle, a car with a better-than-phone-grade machine in it would make the job simpler.)