Stochastic halftoning screening method

Details Stochastic halftoning screening method Stochastic halftoning screening method

1998-06-01

2000-01-11

Williams, Kimberly A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358456, 358457, 358455, B41B 1500, B41J 1500, G06F 1500, H04N 140

Patent

active

060145005

ABSTRACT:
Special stochastic screens are generated to eliminate the moire between stochastic screens and checkerboard inputs. Using the checkerboard pattern, we can divide the entire stochastic screen S into two subsets: S.sub.1 is defined by all pixels, which lie on the white half of the checkerboard, and S.sub.2 is by the black half. The design of a stochastic screen is a mathematical optimization process, which as a single-value merit function as Q(S), so the design process can be described as maximizing Q(S). To eliminate the moire between the checkerboard input and the stochastic screen, the same design criteria to the two subsets, S.sub.1 and S.sub.2, individually, as well as to the entire set S is applied.

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patent: 5696602 (1997-12-01), Cooper et al.
patent: 5745660 (1998-04-01), Kolpatzik et al.

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