Angle avoidance for color halftone screens

Details Angle avoidance for color halftone screens Angle avoidance for color halftone screens

2005-04-18

2010-12-14

Haskins, Twyler L. (Department: 2625)

Facsimile and static presentation processing

Natural color facsimile

Specific image-processing circuitry

C358S001900, C358S534000, C358S003260, C358S533000, C358S497000, C359S891000

Reexamination Certificate

active

07852536

ABSTRACT:
A method for avoiding objectionable moiré in a color image can include identifying a problematic excitation angle associated with a problematic excitation in a marking process or in the color image and selecting a set of at least two halftone screens for rendering at least two separations of the color image wherein the set of screens is selected to avoid including significant screen fundamental, harmonic and beat frequencies at angles closer than about 1 degree of the identified problematic excitation angle. Halftoning the color image according to the selected set of screens avoids objectionable moiré associated with the problematic excitation.

REFERENCES:
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patent: 2004/0109184 (2004-06-01), Ishii
patent: 2000-152015 (2000-05-01), None
Amidror, et al., “Spectral analysis and minimization of moiré patterns in color separation,” Journal of Electronic Imaging, Jul. 1994, vol. 3(3), pp. 295-317.
A machine generated translation of JP 2000-152015.

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