General kernel function for electronic halftone generation

Details General kernel function for electronic halftone generation General kernel function for electronic halftone generation

1990-09-14

1993-10-12

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358298, 358456, H04N 140

Patent

active

052530841

ABSTRACT:
There is disclosed 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.

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.
U.S. patent application U.S. Ser. No. 07/639,962, filed Jan. 11, 1991.
U.S. patent application U.S. Ser. No. 07/639,977, filed Jan. 11, 1991.
U.S. patent application U.S. Ser. No. 07/640,024, filed Jan. 11, 1991.
U.S. patent application U.S. Ser. No. 07/640,025, filed Jan. 11, 1991.

Affiliated with

Also associated with

Rating

General kernel function for electronic halftone generation does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with General kernel function for electronic halftone generation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and General kernel function for electronic halftone generation will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1909301