Method for four-color zero-moire halftoning using...

Details Method for four-color zero-moire halftoning using... Method for four-color zero-moire halftoning using...

2006-01-10

2006-01-10

Lee, Thomas D. (Department: 2624)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S002100, C358S003060, C358S003090, C358S003110, C358S003200

Reexamination Certificate

active

06985262

ABSTRACT:
The invention provides methods for using single-cell non-orthogonal cluster screens to satisfy the moiré-free conditions for four-color halftoning. The selection of these single-cell halftone screens is determined by identifying combinations of four of the halftone cells which satisfy moiré-free conditions provided in the respective frequency equations. Constraints may be applied and the combinations not meeting such constraints can be removed.

REFERENCES:
patent: 4185304 (1980-01-01), Holladay
patent: 5323245 (1994-06-01), Rylander
patent: 5371612 (1994-12-01), Sakamoto
patent: 5883725 (1999-03-01), Sawano
patent: 6226103 (2001-05-01), Klassen et al.

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