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calibration ? there is a special checker pattern that is placed on the floor and a procedure followed to calibrate the camera... the extras down the bottom show it has a further option... that I thought comes with active guidelines
very few have the correct patterns.... the diagnostics and the camera (I believe) must see what it thinks is the correct shape / design to complete the set up - if you check out ADAS kit the multitude of different boards and wotsits between manufacturers is stupid