Patent ID: 6778290
Filing Date: 2004-08-17
Classification: G02B,G06K

Abstract:
A method of correcting nonuniformities in images on a medium wherein data to pixels of a LCD modulator are modified in an image processing sub-system, comprising the steps of:a) activating an uncorrected LCD modulator with a flat-field image of a mid-density value from a digital image file and recording such an image frame onto the medium; b) digitizing the resulting image frame at the full image aperture and resolution of the LCD modulator using a high resolution digital scanner or microdensitometer to obtain density readings for each pixel in all monochromatic image planes of the image frame; c) creating a uniformity data map digital file of percent variations in density readings for all pixels in an image for all monochromatic image planes in the image frame relative to a median density point for all pixels in an associated plane; and d) correcting all pixels in each image plane within the LCD modulator control to reduce density variations on the medium to an acceptable limit.