Ok, I have a use case for this. If you could figure out how to get it off the cloud and low power, it would be awesome to have one of these on the gates to my house, so when I drive up the plates are automatically recognized and the gates open to my car.
Don't rely on garage openers for security, either: the door relies on a rather simple password scheme. In other words, treat it as a garden fence, not a blast door.
Better to use the tire pressure sensors and a software defined radio module to pick up the unique identifiers of your wheels. Way lower power than OCR.