Patent ID: 7489425

Claim:
A method for controlling an operating process of a printing machine, which comprises the steps of: performing a learning phase by the steps of: illuminating a movable object in a non-moving state and its surroundings from different directions successively by different fixed-location light sources; obtaining first image signals reproducing the movable object and the surroundings with an image recording device for each illumination scene; processing the first image signals for determining an unambiguous association between object edges and object shadows in relation to a respective light source resulting in learning signals; and storing the learning signals; performing an operating phase by the steps of: illuminating the movable object during a moving state and the surroundings simultaneously by the different fixed-location light sources; obtaining second image signals reproducing the movable object and the surroundings with the image recording device; determining from the learning signals stored during the learning phase and the second image signals obtained continuously in the operating phase, a position of the movable object in space; and processing the position of the movable object to influence the operating process as needed.