The system incorporates a small conveyor belt with a length of 1.7 m and a width of 0.4 m. The speed of the belt is 0.21 m/s. On top of this belt a construction was made to hold a video camera (SONY, XC-77CE) with a 8–16 mm zoom lens. The axis of the camera is orientated perpendicularly above the belt in such a way that the scanlines of the image are parallel to the direction of the movement of the belt.