Dither matrix generation

Details Dither matrix generation Dither matrix generation

2003-04-30

2008-09-02

Poon, King (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S003060, C358S002100, C382S237000

Reexamination Certificate

active

07420709

ABSTRACT:
A method for generating a dither matrix for converting a gray scale image having N gray levels into a halftone image, which includes using a parametric filter to generate a dither halftone pattern for each gray level Gi>Gt, where N>2, Gtrepresents a transition gray level, the lightest gray level is G0, the darkest gray level is GN−1, and Gt≧G0, the parametric filter based upon a desired spot profile function of the halftone image, and using the generated dither halftone pattern to generate the dither matrix.

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Lau, D.L, Arce,G. R., Gallagher, N.C., Digital color halftoning with generalized error diffusion and multichannel green-noise masks, IEEE Transactions on Image Pressing, vol. 9, No. 5, May 2000.
Ulichney, Robert, Digital HalftoningThe MIT Press, Cambridge, Massachusetts, ISBN 0-262-21009-6, Fifth Printing, 1996.

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