Method and apparatus for printing halftones with a gray level pr

Details Method and apparatus for printing halftones with a gray level pr Method and apparatus for printing halftones with a gray level pr

1992-06-05

1994-05-17

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358456, 358457, 358458, 358459, 358465, 358466, H04N 140

Patent

active

053133099

ABSTRACT:
A method and an arrangement for reproducing an original image that has one or more different image type regions. The arrangement has a scanner which scans and digitizes the original image into pixels, a controller coupled to the scanner to receive the digitized original image, and which produces a first signal corresponding to a gray level halftoned representation of the digitized original image, and a printer coupled to the controller to receive the first signal and which produces a gray level halftoned reproduction of the original image. The controller operates the printer in a default mode when the original image contains a text region or a halftone region, this default mode including either contour suppression applied to every pixel of the original image, or using an output screen that is a higher frequency than a screen of the original image.

REFERENCES:
patent: 4245258 (1981-01-01), Holladay
patent: 4945422 (1990-07-01), Ng
patent: 4959730 (1990-09-01), Tai et al.
patent: 4963990 (1990-10-01), Henderson et al.
patent: 5125072 (1992-06-01), Ng
patent: 5129048 (1992-07-01), Ng

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