Error diffusion processor and method for converting a grey scale

Details Error diffusion processor and method for converting a grey scale Error diffusion processor and method for converting a grey scale

1992-07-01

1994-08-09

Ip, Paul

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358465, 358456, 345132, 345138, H04N 140

Patent

active

053371607

ABSTRACT:
A data processing system converts a raster image of grey scale value pixels into an image of binary value pixels and diffuses pixel value errors that result from the conversion. The data processing system initially converts a grey scale value pixel to a binary value pixel, determines an error value for the pixel by finding a difference between the pixel's binary value and its previous grey scale value; derives error diffusion values attributable to immediately adjacent pixels in a next line of the raster image and stores those attributable error diffusion values. Upon reaching one of the immediately adjacent grey scale value pixels in the next line, and during a conversion of that pixel from its grey scale value to a binary value, the attributable stored error diffusion values are accessed and combined with the adjacent pixel's grey scale value.

REFERENCES:
patent: 4523231 (1985-06-01), Therrien
patent: 4625202 (1986-11-01), Richmond et al.
patent: 4648045 (1987-03-01), Demetrescu
patent: 4680645 (1987-07-01), Dispoto et al.
patent: 4780711 (1988-10-01), Doumas
patent: 4851825 (1989-07-01), Naiman
patent: 4891714 (1990-01-01), Klees
patent: 5086484 (1992-02-01), Katayama et al.
patent: 5130823 (1992-07-01), Bowers
patent: 5172247 (1992-12-01), Ghaderi
"4.3: An Adaptive Algorithm for Spatial Grey Scale", Robert Floys & Louis Steinberg, 2 pages.
"On The Error Diffusion Technique For Electronic Halftoning", C. Billotet-Hoffmann & O. Bryngdahl, Proceedings of the SID, vol. 24/3, 1983.

Affiliated with

Also associated with

Rating

Error diffusion processor and method for converting a grey scale does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Error diffusion processor and method for converting a grey scale, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Error diffusion processor and method for converting a grey scale will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-220232