Error diffusion of overlapping dots

Details Error diffusion of overlapping dots Error diffusion of overlapping dots

1990-01-02

1992-02-11

Boudreau, Leo H.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

382 50, 358461, H04N 140

Patent

active

050879812

ABSTRACT:
Method and apparatus for converting gray-scale pixel information into data for rendering dots by a printer, video display, or similar device. A form of error diffusion is used wherein a thresholding error produced during the conversion process for a particular dot is propagated to one or more adjacent dots. The propagated error modifies the comparisons made for the adjacent dots and can be converted into lightness space to linearize the error. The error itself is modified when there is overlap of the propagating dot with an adjacent dot. The overlap modification is dependent upon the density levels being rendered and the amount of overlap between the dots.

REFERENCES:
patent: 4651228 (1987-03-01), Koch
patent: 4654721 (1987-03-01), Goertzel et al.
patent: 4680645 (1987-07-01), Dispoto et al.
patent: 4891714 (1990-01-01), Klees
Hunt, The Reproducing of Colour in Photography, Printing & Television, 1987, pp. 69-73, 114-123 and 264-265.
Lama et al., "Hybrid (Gray Pixel) Halftone Printing," Journal of Imaging Technology, vol. 15, No. 3, Jun. 1989, pp. 130-135.

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