Facsimile and static presentation processing – Natural color facsimile – Specific image-processing circuitry
Patent
1993-02-19
1994-06-21
Brinich, Stephen
Facsimile and static presentation processing
Natural color facsimile
Specific image-processing circuitry
358533, H04N 146
Patent
active
053232453
ABSTRACT:
A screen system used in the electro-optical reproduction of half-tone pictures in multicolor prints are generated by an algorithm which simulates a continuous tone image. There is disclosed partial screens and screen systems produced by an algorithm for use with a digitized image which provides a means of simulating a continuous tone image containing a range of gray shades from black to white or a color separation. The "Threshold equation" is the key of the invention as it calculates a threshold gray value that is compared to the desired local image value to determine whether that particular point should be "on" or "off". Which points (spots) are "on" and which are "off" is determined by the function that assigns a "threshold" value (the shade at which a pixel changes from "off" to "on") based on a pixels "x" and "y" coordinates. The generated screen comprises columns and rows of halftone dot centers, the columns and rows are geometrically orthogonal (perpendicular), but the row to row spacing and/or column to column spacing is not equal, either row to row, column to column, or row to column.
REFERENCES:
patent: 3657472 (1972-04-01), Taudt et al.
patent: 3911480 (1975-10-01), Brucker
patent: 3997911 (1976-12-01), Perriman et al.
patent: 4084183 (1978-04-01), Keller et al.
patent: 4185304 (1980-01-01), Holladay
patent: 4339774 (1982-07-01), Temple
patent: 4419690 (1983-12-01), Hammes
patent: 4443060 (1984-04-01), Jung et al.
patent: 4456924 (1984-06-01), Rosenfeld
patent: 4486788 (1984-12-01), Yamada
patent: 4507685 (1985-03-01), Kawamura
patent: 4543613 (1985-09-01), Sakamoto
patent: 4651228 (1987-03-01), Koch
patent: 4773734 (1988-09-01), Inoda
patent: 4805033 (1989-02-01), Nishikawa
patent: 4814797 (1989-03-01), Haneda et al.
patent: 4894726 (1990-01-01), Steinhardt et al.
patent: 4920501 (1990-04-01), Sullivan et al.
patent: 4926248 (1990-05-01), Kobayashi et al.
patent: 4970586 (1990-11-01), Sunda et al.
patent: 4987498 (1991-01-01), Shimazaki
patent: 5055923 (1991-10-01), Kitagawa et al.
Brinich Stephen
Griswold Gary L.
Kirn Walter N.
Levinson Eric D.
Minnesota Mining and Manufacturing Company
LandOfFree
Perpendicular, unequal frequency non-conventional screen pattern does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Perpendicular, unequal frequency non-conventional screen pattern, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Perpendicular, unequal frequency non-conventional screen pattern will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2224355