Camera calibration

First and second angles are measured from a nominal camera centerline to respective first and second positions. The first position is determined by the camera locating a first centerpoint in a first board. The second position is determined by the camera locating a second centerpoint in a second board. The first and second angles, and first and second horizontal distances of the camera from the first board and the second board, respectively, are used to obtain a determined vertical distance and a determined angle. The determined vertical distance measures a distance from the second centerpoint to a point determined by an intersection of a first line through the second board and a second line that is parallel to the floor and has an endpoint at the camera. The determined angle measures an angle of between third line extending from the camera in the nominal position and the second line.