Bi-level image display signal processing apparatus

Details Bi-level image display signal processing apparatus Bi-level image display signal processing apparatus

1989-03-17

1990-05-08

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358463, 358457, H04N 140

Patent

active

049243225

ABSTRACT:
An image signal processing apparatus for converting input signal values representing density levels of successive picture elements of an image to corresponding bi-level signal values, whereby a conversion error for an object picture element is apportioned among a set of unprocessed adjacent picture elements, to update respective values of accumulated error. Each input signal value is compensated, prior to conversion, by a value derived from the total accumulated errors of the object picture element and these adjacent picture elements, while the conversion error is derived by subtracting from the bi-level output value a value obtained by compensating the input signal by the accumulated error for the object picture element.

REFERENCES:
patent: 4554593 (1985-11-01), Fox et al.
patent: 4593325 (1986-06-01), Kannapell et al.
patent: 4599656 (1986-07-01), Bellinghausen
patent: 4703363 (1987-10-01), Kitamura
"An Adaptive Algorithm for Spatial Grey Scale" by R. Floyd et al; SID 75 Digest, pp. 36-37.
ICC, vol. 1, Jun. 11-13, 1793, Seattle, B. E. Bayer, "An Optimum Method for Two-Level Rendition of Continuous-Tone Pictures", pp. 26.11-26.15.

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