Method and apparatus for color halftoning

Details Method and apparatus for color halftoning Method and apparatus for color halftoning

1997-09-30

2000-10-31

Coles, Edward L.

Facsimile and static presentation processing

Natural color facsimile

Specific image-processing circuitry

358456, 358536, 395109, G06F 1500, H04N 140, H04N 146

Patent

active

061411213

ABSTRACT:
A method and apparatus for halftoning where at most one halftoned gray, or multi-level, pixel will occur in those halftone cells having a constant area of ink. The method and apparatus includes placing a threshold array and the pixel tonal values within the same range if the threshold array and pixel tonal values are in different ranges. The elements in the threshold array are then compared to the pixel tonal values in order to determine a resulting output value.
The preferred apparatus for halftoning includes a memory for storing the threshold array; a multiplier for multiplying one 8-bit value representing the number of pixels in a halftone cell by a second 8-bit value which is a pixel tonal value; a comparator for comparing the results of the multiplier with an element from the threshold array; and a multiplexer for selecting a resulting output value based upon the output generated by the comparator.

REFERENCES:
patent: 5124803 (1992-06-01), Troxel
patent: 5166809 (1992-11-01), Surbrook
patent: 5359430 (1994-10-01), Zhang
patent: 5526445 (1996-06-01), Smutek et al.
patent: 5592592 (1997-01-01), Shu
patent: 5598204 (1997-01-01), Harrington
patent: 5633729 (1997-05-01), Smith et al.
patent: 5689586 (1997-11-01), Lin

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