Color imaging

Details Color imaging Color imaging

1993-07-07

1997-03-11

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358465, 358466, G06K 1500

Patent

active

056110227

ABSTRACT:
A bi-level printer is controlled to selectively enhance each pel, based on an error diffusion process. However, each channel (e.g., RGB red, green and blue color channels; Lab luminance, red direction and blue direction channels; or other suitable channel division) is processed individually according to a suitable kernel to provide a multi-color image. In addition, an individual "threshold" level (by which the "actual" state of enhancement of a pel is determined) is calculated for each color channel, based on the minimum and maximum enhanced levels of all of the pels in the "desired" image. Also, the order of processing individual pels and the error diffusion matrix are both reversed for each subsequent line of pels. It has been found that each one and various combinations of these features significantly improves image clarity, sharpness and tone continuity.

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Robert Floyd and Louis Steinberg, "An Adaptive Algorithm for Spatial Grey Scale", Stanford University, p. 36, SID 75 Digest (1975).

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