Halftoning using dot and line screens to avoid two and three...

Details Halftoning using dot and line screens to avoid two and three... Halftoning using dot and line screens to avoid two and three...

2006-01-10

2006-01-10

Rogers, Scott A. (Department: 2626)

Facsimile and static presentation processing

Static presentation processing

Attribute control

C358S003260, C358S533000, C358S536000

Reexamination Certificate

active

06985256

ABSTRACT:
Moiré free color halftoning is achieved through the use of two dot screens and one or two line screens. The line screens may be, for example hybrid line screens. Frequency vectors associated with the screens combine to produce moiré frequency vectors representing moiré frequencies above or below the visual range. In one embodiment lines screens are used to halftone yellow and black separations and dot screens are used to halftone cyan and magenta separations. The dot screens are oriented at 15 and 75 degrees. The line screens are oriented at 45 and 135 degrees. Selected screens and screen orientations minimize screen interaction with mechanical or optical artifacts of a rendering device, thereby minimizing mechanical and optical moiré.

REFERENCES:
patent: 5155599 (1992-10-01), Delabastita
patent: 6641241 (2003-11-01), Inoue
Thomas M. Holladay, “An Optimum Algorithm For Halftone Generation For Displays and Hard Copies”,Proceedings of the SID,vol. 21/2, 1980.

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