Method for avoiding multiple color moirés in color...

Details Method for avoiding multiple color moirés in color... Method for avoiding multiple color moirés in color...

2007-05-22

2007-05-22

Rogers, Scott A. (Department: 2625)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S003260, C358S533000, C358S536000

Reexamination Certificate

active

10449424

ABSTRACT:
A method for halftoning an image, including receiving image data including a plurality of color separations and comparing image data for first, second, third, and fourth separations to first, second, third, and fourth halftone screens. The screens are characterized by first, second, third, and fourth pairs of frequency vectors, respectively. The fourth pair of frequency vectors is identical to one of the first, second, and third pairs of frequency vectors. Further, the first, second, third, and fourth screens have an associated fill-in sequence, where the fill-in sequence of the fourth screen is such that overlap between the separation corresponding to the fourth screen and the separation corresponding to the one of the first, second, and third screens to which the fourth screen has an identical pair of frequency vectors does not occur until a combined dot area coverage of the separations is greater than 100%.

REFERENCES:
patent: 5381247 (1995-01-01), Hains
patent: 6798539 (2004-09-01), Wang et al.
patent: 6972871 (2005-12-01), Tsuda et al.
patent: 6985256 (2006-01-01), Cheng et al.
patent: 6985262 (2006-01-01), Wang
Wang, et al, Method for Moire-Free Color Halftoning Using Non-Orthogonal Cluster Screens, filed Oct. 30, 2000.
Cheng, et al, Halftoning Using Dot and Line Screens to Avoid Two and Three Color Moire, filed Jul. 19, 2001.

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