Method and apparatus for color halftoning using different halfto

Details Method and apparatus for color halftoning using different halfto Method and apparatus for color halftoning using different halfto

1996-01-31

1999-07-27

Lee, Thomas D.

Facsimile and static presentation processing

Natural color facsimile

Specific image-processing circuitry

358298, H04N 146

Patent

active

059300108

ABSTRACT:
Digital halftoning is used to reduce the number of pixel levels used to represent a multiple dot plane image to a smaller number of pixel levels for display on an output device such as an ink-jet printer. Two algorithms commonly used to halftone the dots of a given dot plane are error diffusion and ordered dither. Error diffusion produces patterns of dots that are pleasing to the human visual system but is computationally complex. Ordered dither operates quickly but produces patterns of dots that are visually objectionable. A method is taught in the present invention that employs error diffusion to halftone dot planes that contain relatively dark dots that are visually apparent, and employs ordered dither to halftone dot planes that contain relatively light dots that are not noticeable. The resulting output is pleasing to the human visual system and computed quickly.

REFERENCES:
patent: 5055923 (1991-10-01), Kitagawa et al.
patent: 5144419 (1992-09-01), Nakatsuka et al.
patent: 5394252 (1995-02-01), Holladay et al.
patent: 5426519 (1995-06-01), Banton
patent: 5455682 (1995-10-01), Ikuta

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