Arrangement e.g. for recognizing double copies in mail sorting plants, has side and projector which has light source projected across potential overlap of objects

摘要

The arrangement has a side and a projector which has a light source projected across a potential overlap of objects. A side of the objects is arranged and slanted to the projector light with a camera positioned so that the image projected by light line (s) and their transfer to the camera allows height differences and overlapping edges to be visually identified. A computer is provided that has an image memory allowing a comparison between the level of altitude differences of the overlapping areas and specified height values objects.