Screen generation for halftone screening of images using arbitra

Details Screen generation for halftone screening of images using arbitra Screen generation for halftone screening of images using arbitra

1991-12-10

1994-05-24

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358459, 358466, 358534, H04N 140

Patent

active

053154061

ABSTRACT:
A halftone screen with precisely controlled angles and rulings, including irrational screen angles and rulings, for screening photographic images is generated by representing a desired screen pattern in an irregular or non-grid like array of screen elements. In one embodiment, a random array of screen elements is used. In another embodiment, a Poisson-disk distribution of screen elements is used to improve quality. The error between an ideal screen point and an actual screen point in the transformed UV space is calculated and used as the basis for selecting an actual screen point as having the least error between the ideal and actual screen points in UV space. The number of error calculations may be reduced by storing pointers the nearest points to each screen point in transformed UV space, and by storing a plurality of successive screen values at a given angle and screen ruling corresponding to each point in the transformed UV space.

REFERENCES:
patent: 3657472 (1972-04-01), Taudt et al.
patent: 4149194 (1979-04-01), Holladay
patent: 4185304 (1980-01-01), Holladay
patent: 4413286 (1983-11-01), Boston
patent: 4456924 (1984-06-01), Rosenfeld
patent: 4499489 (1985-02-01), Gall et al.
Wolberg, Digital Image Warping, IEEE Computer Society Press, Los Alamitos, pp. 173-176.

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