I want to be able to identify a car in a roofed parking bay similar to the image below
I have thought of two ways but I'm not sure which would be the best.
The first option is using passive UHF RFID. I feel like this would be a very robust system, and require very little maintenance. The biggest problem with this is UHF RFID readers are very expensive and the project would require 20+ of these.
The second option is using QR codes read by a camera mounted on the roof. This option is less expensive as the Arduino cameras are quite cheap, but I feel like it wont be as robust and require a lot more maintenance.
What would you suggest?