Halftone screen generator, halftone screen and method for genera

Details Halftone screen generator, halftone screen and method for genera Halftone screen generator, halftone screen and method for genera

1998-06-17

2000-10-03

Rogers, Scott

Facsimile and static presentation processing

Static presentation processing

Attribute control

358298, G06K 1502, H04N 1405

Patent

active

061280992

ABSTRACT:
A halftone screen generator, a halftone screen and a method for making the halftone screen are described. The halftone screen has a screen angle and rulings that define the theoretical centers of gravity of the halftone dots. The actual centers of gravity of the halftone dots are displaced from the theoretical centers of gravity by the length and angle of random phase vectors. In one example, the positional displacement of the centers of gravity of the dots is dot size dependent in an inverse relationship. The shift in dot centers of gravity away from the theoretical centers of gravity defined by the halftone screen effectively breaks up screen "patterning" and avoids objectionable halftone "graininess".

REFERENCES:
patent: 5109283 (1992-04-01), Carley
patent: 5239391 (1993-08-01), Hamilton
patent: 5315407 (1994-05-01), Sakamoto et al.
patent: 5432611 (1995-07-01), Haneda et al.
patent: 5473440 (1995-12-01), Haneda et al.
patent: 5486927 (1996-01-01), Koizumi et al.
patent: 5493411 (1996-02-01), Haneda et al.

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