@Craig. .
I'm struggling to understand exactly what importance the board actually is, as the camera is exactly that, just a camera and surely only shows a video image out, and can't transmit info back to any board? Prove me wrong, please!
The boards are used to mark the central point for the calibration data to be confirmed as correct for the car spec such as wheelbase, boot open threshold, height from ground to camera etc, that's why laser tools are used to confirm the boards are located correctly for that specific car type. Keep in mind, the boards and calibration sequence is designed to be done via ODIS, which will do a lot of the heavy lifting with the process so it's expected that doing it with 3rd party tools will be problematic. Especially so with a car that was never specified with a highline camera.
I'm sure the data can be injected but I can't find my notes on the process. There are some very specific prerequisites too:
Calibration requirements
t Camera lens must be clean.
t Vehicle needs to be positioned on a firm and level surface.
t There must be sufficient space all around the vehicle being calibrated.
t Parking brake is applied.
t Steering wheel in zero position, wheels point straight ahead.
t All doors and rear lid are closed.
t There is nobody in the vehicle.
t Vehicle is not loaded (curb weight).
t Before calibration: switch on ignition.
I bet having different coloured ground under the boards, such ass grass, would cause issues, as well as too much light on the board, bleeding the image for the camera.
For example, here is a random screengrab I just took of the Passat sequence: