Replacement halftoning

Details Replacement halftoning Replacement halftoning

2004-08-11

2009-11-24

Tran, Douglas Q (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S001900

Reexamination Certificate

active

07623268

ABSTRACT:
A method and an apparatus to perform replacement halftoning is disclosed. In one embodiment, the method comprises dithering multiple color channels of a pixel of an image to generate a plurality of halftone outputs. Each of the halftones corresponds to a distinct color channel of the pixel. The method further includes creating a virtual color channel from two or more color channels of the plurality of color channels and applying error diffusion to the virtual color channel to generate an error diffusion halftone outputs, and then replacing of the dither output error diffusion halftone outputs.

REFERENCES:
patent: 5715073 (1998-02-01), Miller
patent: 6204934 (2001-03-01), Minamino
patent: 6549303 (2003-04-01), Trask
patent: 6643031 (2003-11-01), Takano et al.

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