MULTILEVEL HALFTONING MODULE WITH NON-UNIFORMITY COMPENSATION

An image processing module for processing a digital M-level input image into a digital N-level output image is provided, wherein M>N and N>2, a level being indicative of a colorant density in a printing process. The module applies N-1 thresholds for determining an output level for each image e...

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Bibliographic Details
Main Authors GERRITS CAROLUS E.P, HUYGHEN JOHANNES H
Format Patent
LanguageEnglish
Published 07.04.2016
Subjects
ELECTRIC COMMUNICATION TECHNIQUE
ELECTRICITY
PICTORIAL COMMUNICATION, e.g. TELEVISION
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Summary:An image processing module for processing a digital M-level input image into a digital N-level output image is provided, wherein M>N and N>2, a level being indicative of a colorant density in a printing process. The module applies N-1 thresholds for determining an output level for each image element with an input level, wherein thresholds associated with a transition between two output levels are arranged in a threshold matrix, all N-1 threshold matrices being arranged in accordance with a single basic threshold matrix arrangement. The image processing module comprises threshold matrices, wherein the thresholds have been adjusted to compensate printed density variations except the thresholds associated with a transition between a first and a second level, which have not been adjusted in order to keep a number of colorant receiving print positions constant.
Bibliography:Application Number: US201514876396