Facsimile and static presentation processing – Natural color facsimile – Color photography previewer
Patent
1993-02-19
1993-11-02
Brinich, Stephen
Facsimile and static presentation processing
Natural color facsimile
Color photography previewer
358459, H04N 146
Patent
active
052588327
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 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 in which the columns and rows are not perpendicular to each other and the column to column spacing is not equal to the row to row spacing.
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
Brinich Stephen
Griswold Gary L.
Kirn Walter N.
Levinson Eric D.
Minnesota Mining and Manufacturing Company
LandOfFree
Non-perpendicular, unequal frequency non-conventional screen pat does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Non-perpendicular, unequal frequency non-conventional screen pat, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Non-perpendicular, unequal frequency non-conventional screen pat will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1761590