Facsimile and static presentation processing – Natural color facsimile – Image reproduction
Patent
1993-12-16
1995-03-14
Coles, Sr., Edward L.
Facsimile and static presentation processing
Natural color facsimile
Image reproduction
358504, 358518, 358520, G03F 308
Patent
active
053981200
ABSTRACT:
A high color resolution image is accurately approximated with a low resolution image through ordered dithering to colors of a displayable color palette. The colors of the displayable color palette are located at points of a grid aligned with three orthogonal axes in a three dimensional color model, including a luminance axis between black and white. The grid points are defined by the intersections of three sets of parallel planes, each set being perpendicular to one of the three axes. The set of planes perpendicular to the luminance axis are spaced nonuniformly, preferably according to a cubic model. The ordered dithering maps the true color of a pixel in the image to the color in the displayable palette at one of eight adjacent grid points. When ordered dithering of a pixel's true color would map the true color to a grid point outside the color gamut, the pixel is instead mapped to the nearest color on the color gamut's border to the grid point.
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Computer Graphics: Principles and Practice by Foley, van Dam, Feiner, and Hughes, Reprinted with corrections Nov., 1991; Chapter 13.
Dithering for 12-Bit True-Color Graphics by Wells, Williamson and Carrie of Sun Microsystems; IEEE Computer Graphics & Applications, Sep. 1991.
Friedman Steven J.
Hargrove Karen A.
Joy Joseph M.
Myhrvold Nathan P.
Shrivastava Sunita
Coles Sr. Edward L.
Microsoft Corporation
Ning John
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