System and method for monitoring color in a printing press
AssigneeQuad/Tech, Inc.
InventorsJohn C. Seymour, Jeffrey P. Rappette, Frank N. Vroman, Chia-Lin Chu, Bradly S. Moersfelder, Michael A. Gill, Karl R. Voss
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Abstract
A method for monitoring color of a printed image printed on a substrate, the method comprising the steps of: positioning a camera assembly to receive light reflected from the printed image on the substrate, the camera assembly including a structure for producing a signal; transmitting the signal from the camera assembly to a computer; and processing the signal in the computer to correct for the effects of scattered light reflected from the printed image.
Claims30
A method for monitoring color quality of a printed image printed on a substrate, the method comprising the steps of:
- positioning a camera assembly to receive light reflected from the printed image on the substrate, the camera assembly including a means for producing a signal;
- transmitting the signal from the camera assembly to a computer;
- and
- processing the signal in the computer, the step of processing the signal in the computer including the steps of digitizing the signal to produce a digitized array and correcting the digitized array for the effects of scattered light wherein the step of correcting the digitized array includes the step of digitally filtering the digitized array, and wherein the step of digitally filtering the digitized array includes the step of using an exponential function to model the optical response of the camera assembly.
An apparatus for monitoring color quality of a printed image printed on a substrate, the apparatus comprising:
- a camera assembly positioned with respect to the substrate so as to receive light reflected from the printed image, the camera assembly including means for producing a signal, and
- a computer for receiving and processing a signal from the camera assembly, said computer including means for digitizing the signal to produce a digitized array and means for correcting the digitized array for the effects of scattered light, said means for correcting the digitized array including means for digitally filtering the digitized array, wherein said means for digitally filtering the digitized array includes means for modelling the optical response of the camera assembly using an exponential function.
A method for monitoring color quality of a printed image printed on a moving substrate, the method comprising the steps of:
- illuminating the printed image on the moving substrate with a strobe light,
- positioning an image recording device to receive light reflected from the printed image on the moving substrate, the image recording device including a means for producing a signal;
- transmitting the signal from the image recording device to a computer;
- and
- processing the signal in the computer, the step of processing the signal in the computer including the steps of digitizing the signal to produce a digitized array and correcting the digitized array for the effects of scattered light, wherein the step of correcting the digitized array includes the step of digitally filtering the digitized array, and wherein the step of digitally filtering the digitized array includes the step of using an exponential function to model the optical response of the image recording device.
An apparatus for monitoring color quality of a printed image printed on a moving substrate, the apparatus comprising:
- means for illuminating the printed image on the moving substrate, said means for illuminating including a strobe light,
- a camera positioned with respect to the substrate so as to receive light reflected from the substrate, the camera including means for producing a signal, and
- a computer for receiving and processing a signal from the camera assembly, said computer including means for digitizing the signal to produce a digitized array and means for correcting the digitized array for the effects of scattered light, said means for correcting the digitized array including means for digitally filtering the digitized array, wherein said means for digitally filtering the digitized array includes means for modelling the optical response of the camera using an exponential function.
Dependencies are inferred from the claim text.