Method and device for determining compass differences of printing image positions of a multicolour offset printing

A method and a device are proposed for carrying out a value determination of the register difference on contours occurring in the printed image (for example letters in negative writing) by means of a colour video camera 2. The signal of the colour video camera 2 carrying the colour information is su...

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Bibliographische Detailangaben
Hauptverfasser:	OTTERBACH, RAINER, STEINER, GERD, WENIGER, RUDI, SCHUBERT, ERHARD, BRAUN, ROLF, HOFMANN, RALF
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	APPARATUS SPECIALLY ADAPTED THEREFOR CALCULATING CINEMATOGRAPHY COMPUTING COUNTING ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY ELECTROGRAPHY HOLOGRAPHY IMAGE DATA PROCESSING OR GENERATION, IN GENERAL LINING MACHINES MATERIALS THEREFOR ORIGINALS THEREFOR PERFORMING OPERATIONS PHOTOGRAPHY PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES,e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTORDEVICES PHYSICS PICTORIAL COMMUNICATION, e.g. TELEVISION PRINTING PRINTING MACHINES OR PRESSES STAMPS TRANSPORTING TYPEWRITERS
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Beschreibung
Zusammenfassung:	A method and a device are proposed for carrying out a value determination of the register difference on contours occurring in the printed image (for example letters in negative writing) by means of a colour video camera 2. The signal of the colour video camera 2 carrying the colour information is subjected to a colour separation in accordance with the printed colours occurring during printing. A contour, which has been produced by printing at least two printed colours on top of one another thus results in at least two separations in the corresponding printed colours. To determine the register difference, the offset from one part-image (separation) compared with the other part-image is now calculated. According to the device, a frame buffer 4, a colour separation computer 5, a colour separation memory 6 and an image computer 7 are provided in addition to a colour video camera 2.