Stochastically clustered dot halftoning system
AssigneeXerox Corporation
InventorShen-ge Wang
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Abstract
A method of halftoning a digitized image is described, in which a "stoclustic" screen is used. The halftone outputs produced by stochastically clustered pixel screens of the present invention (also referred to herein as "stoclustic" screens) are clustered about arbitrarily or otherwise specified centers. According to one embodiment of the present invention, one step in the present invention requires that the locations of the set of stochastically distributed black and white cluster centers must be determined. Thereafter, according to block 104, a dot or pixel growth positioning sequence for adding pixels to the cluster about the selected cluster centers must be established.
Claims8
A method of designing a digital halftoning screen for forming images on output sheets according to a set of image signals, said method including the steps:
- selecting a first set of stochastically distributed black cluster centers;
- selecting a second set of stochastically distributed white cluster centers;
- and
- growing pixels about the black cluster centers and the white cluster centers according to a pixel filling optimization system.
A printing system including a system for digitally halftoning images on an output sheet according to a set of image signals, said printing system comprising;
- a memory for storing a stochastically clustered halftone screen including a first set of stochastically distributed black cluster centers and a second set of stochastically distributed white cluster centers, wherein sets of pixels are filled about the black cluster centeres and the white cluster centers according to a pixel filling optimization system;
- and
- a processor for comparing said image signals to said halftone screen for providing a rendered image on said output sheet.
Dependencies are inferred from the claim text.