Facsimile and static presentation processing – Static presentation processing – Attribute control
Reexamination Certificate
2011-04-26
2011-04-26
Tran, Douglas Q (Department: 2625)
Facsimile and static presentation processing
Static presentation processing
Attribute control
C358S003090
Reexamination Certificate
active
07933044
ABSTRACT:
Disclosed herein is a Moiré-free color halftone configuration for clustered dots. Unlike conventional methods, the disclosed method produces periodic hexagon rosettes of identical shapes. These exemplary hexagon rosettes have three fundamental spatial frequencies exactly equal to half of the fundamental frequency of the three halftone screens. The resultant halftone outputs are truly Moiré free, as all the fundamentals and harmonic frequencies are multiples of and thus higher in frequency than the rosette fundamental frequency. The halftone outputs resulting from the employment of the exemplary rosette design methodology provided herein, are also robust to the typical misregistration among color separations commonly found in color systems.
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Blair Philip E.
Fleit Gibbons Gutman Bongini & Bianco P.L.
Tran Douglas Q
Xerox Corporation
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