Electronic graphic arts screener

Details Electronic graphic arts screener Electronic graphic arts screener

1988-11-16

1990-04-17

Evans, Arthur G.

Boots, shoes, and leggings

358298, G01D 1500

Patent

active

049186221

ABSTRACT:
A digital screener for digitally converting a continuous tone color separation into a corresponding high resolution, bit-mapped, raster scanned halftone separation of an original artwork which utilizes a contone line buffer (913), an image handler (930), a screen handler (950), and a font memory (970). For every successive micro raster that is to occur in the screened image, the screen handler repetitively generates appropriate sampling coordinates, using predefined fast and slow scan incremental values, in order to sample any of the halftone reference patterns along successively positioned angled sampling lines (710, 730) that collectively form an angled grid so as to provide a bit-mapped halftone image pattern oriented at a desired screen angle. The font memory stores a different halftone dot pattern for each different contone value. Each contone value and simultaneously occurring sampling coordinates form addresses to the font memory for selecting a particular sampled reference halftone dot pattern while the sampling coordinates are used to access a particular bit within that pattern. The image handler and the screen hander operate essentially independently of each other for pipelined operation to increase throughput.

REFERENCES:
patent: 3688033 (1972-08-01), Hell et al.
patent: 3806641 (1974-04-01), Crooks
patent: 3916096 (1975-10-01), Everett et al.
patent: 3922484 (1975-11-01), Keller
patent: 3997911 (1976-12-01), Perriman et al.
patent: 4012584 (1977-03-01), Gascoigne
patent: 4051536 (1977-09-01), Roetling
patent: 4084183 (1978-04-01), Keller et al.
patent: 4149194 (1979-04-01), Holladay
patent: 4185304 (1980-01-01), Holladay
patent: 4193096 (1980-03-01), Stoffel
patent: 4196451 (1980-04-01), Pellar
patent: 4203154 (1980-05-01), Lampson et al.
patent: 4214277 (1980-07-01), Urich
patent: 4245258 (1981-01-01), Holladay
patent: 4246614 (1981-01-01), Knox
patent: 4281312 (1981-07-01), Knudson
patent: 4350996 (1982-09-01), Rosenfeld
patent: 4419690 (1983-12-01), Hammes
patent: 4447831 (1984-05-01), Adsett
patent: 4456924 (1984-06-01), Rosenfeld
patent: 4491875 (1985-06-01), Kawamura
patent: 4493049 (1985-01-01), Donohue et al.
patent: 4499489 (1985-02-01), Gall et al.
patent: 4547812 (1985-10-01), Waller et al.
patent: 4606069 (1986-08-01), Johnsen
patent: 4611859 (1987-04-01), Mailloux et al.
patent: 4633327 (1986-12-01), Roetling
patent: 4647962 (1987-03-01), Rosen et al.
patent: 4667247 (1987-05-01), Karow
patent: 4688031 (1987-04-01), Haggerty
patent: 4692879 (1987-09-01), Ikuta
patent: 4698691 (1987-10-01), Suzuki et al.
patent: 4700235 (1987-10-01), Gall
patent: 4717954 (1988-01-01), Fujita et al.
patent: 4727430 (1988-02-01), Miwa
patent: 4730185 (1988-03-01), Springer et al.
patent: 4752822 (1988-06-01), Kawamura
patent: 4774528 (1988-09-01), Kato
P. G. Roetling, "Binary Approximation of Continuous Tone Images", Photographic Science and Engineering, Apr. 1977, vol. 21, No. 2, pp. 60-65.
T. M. Holladay, "An Optimum Algorithm for Halftone Generation for Displays and Hard Copies", SID 79 Digest, pp. 102-103.
P. G. Roetling et al, "Tone Reproduction and Screen Design for Pictorial Electrographic Printing", Journal of Applied Photographic Engineering, Fall 1979, vol. 5, No. 4, pp. 179-182.
P. G. Roetling, "Analysis of Detail and Spurious Signals in Halftone Images", Journal of Applied Photographic Engineering, Winter 1977, vol. 3, No. 1, pp. 12-17.
B. E. Bayer, "An Optimum Method for Two-Level Rendition of Continuous-Tone Pictures", IEEE International Conference on Communications, vol. 1, Seattle, Wash., Jun. 11-13, 1973, pp. 26-11 to 26-15.

Affiliated with

Also associated with

Rating

Electronic graphic arts screener does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Electronic graphic arts screener, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electronic graphic arts screener will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1057594