Correction for scattering in the monitoring of colour in a printing press

Monitoring colour of a printed image printed on a substrate, by positioning a camera assembly (40) to receive light reflected from the printed image (86) on the substrate (12) and transmitting the signal from the camera assembly to a computer to correct for the effects of scattered light reflected f...

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Bibliographische Detailangaben
Hauptverfasser:	FRANK N VROMAN, BRADLY S MOERSFELDER, KARL R VOSS, JOHN C SEYMOUR, CHIA-LIN CHU, JEFFREY P RAPPETTE, MICHAEL A GILL
Format:	Patent
Sprache:	eng
Schlagworte:	CALCULATING COLORIMETRY COMPUTING COUNTING ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY IMAGE DATA PROCESSING OR GENERATION, IN GENERAL LINING MACHINES MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT,POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED,VISIBLE OR ULTRA-VIOLET LIGHT MEASURING PERFORMING OPERATIONS PHYSICS PICTORIAL COMMUNICATION, e.g. TELEVISION PRINTING PRINTING MACHINES OR PRESSES RADIATION PYROMETRY STAMPS TESTING TRANSPORTING TYPEWRITERS
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Beschreibung
Zusammenfassung:	Monitoring colour of a printed image printed on a substrate, by positioning a camera assembly (40) to receive light reflected from the printed image (86) on the substrate (12) and transmitting the signal from the camera assembly to a computer to correct for the effects of scattered light reflected from the printed image. This is achieved by filtering the digitized array using an exponential infinite impulse response filter and subtracting the filtered array from the digitized array. Image processing also includes finding a colour patch portion of the array and correcting for photometric zero.