Multi-resolution halftone tilier

Details Multi-resolution halftone tilier Multi-resolution halftone tilier

1995-12-20

1998-06-30

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358429, 358298, 358534, H04N 140

Patent

active

057742367

ABSTRACT:
A digital halftoning device for converting digitized contoned image data representing an input image into a halftoned image to be displayed in a visually discernible manner comprising: dividing a digitized contoned image data into a plurality of contoned macrocells at predetermined, integrally spaced locations; determining the optical density of each of the macrocells; converting the contoned macropixels to their halftoned representation, including: comparing the optical density of the macrocells against a predetermined threshold; and suppressing chosen macropixels on integer centers in regions of the image where the threshold code value is exceeded; converting the macropixel pattern into a micropixel image pattern; and outputting the micropixel image pattern to be displayed in a visually discernible manner. The result is the creation of a superpixel in areas of high optical density to create a greater number of gray levels at the expense of spatial resolution.

REFERENCES:
patent: 5260807 (1993-11-01), Tai
patent: 5323245 (1994-06-01), Rylander
patent: 5341226 (1994-08-01), Shiau
patent: 5394252 (1995-02-01), Holladay et al.
patent: 5471543 (1995-11-01), Ng et al.
patent: 5489991 (1996-02-01), McMurray

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