Process for providing digital halftone image with random error d

Details Process for providing digital halftone image with random error d Process for providing digital halftone image with random error d

1993-10-26

1996-05-07

Mancuso, Joseph

Image analysis

Image compression or coding

Quantization

382270, 358457, G06K 938

Patent

active

055154565

ABSTRACT:
An error diffusion process includes the steps of: processing an image comprising a plurality of pixels by determining intensity values for each of the pixels; and performing one weight error diffusion for each pixel. The one-weight error diffusion process includes the steps of: encoding an intensity value as a first binary value for each pixel when the determined intensity is less than a predetermined threshold value, and as a second binary value when the determined intensity is greater than the predetermined threshold value, calculating an error value corresponding to the difference between the intensity value and a predetermined value, selecting a pixel either at a first location relative to the pixel presently being processed or a second location relative to the pixel presently being processed, adjusting an intensity value of the selected pixel according to the error value, and performing the error diffusion step for a next pixel value.

REFERENCES:
patent: 4955065 (1990-09-01), Ulichney
patent: 5045952 (1991-09-01), Eschbach
patent: 5051841 (1991-09-01), Bowers et al.
patent: 5060284 (1991-10-01), Klees
patent: 5068914 (1991-11-01), Klees
patent: 5077615 (1991-12-01), Tsuji
patent: 5107346 (1992-04-01), Bowers et al.
patent: 5130823 (1992-07-01), Bowers
patent: 5309254 (1994-05-01), Kuwabara et al.
Robert Ulichney, "Digital Halftoning", 1987, MIT Press, pp. 268-279.

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