Apparatus for processing image signal

Details Apparatus for processing image signal Apparatus for processing image signal

1987-10-16

1989-12-26

Groody, James J.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358464, H04N 140

Patent

active

048901679

ABSTRACT:
An image signal processing circuit for converting a continuous tone image signal to a bi-level image signal, for producing a spatial gray scale image on a bi-level display device such as a gas plasma display panel. Respective values of apportionment factors (K.sub.A to K.sub.D) used for apportioning a bi-level conversion error of each picture element of the image among a plurality of picuture elements (A to D) positioned peripehrally adjacent thereto are periodically altered, in a periodic or random succession of values, to thereby effectively eliminate the generation of a texture pattern in display regions corresponding to areas of uniform density in the original image.

REFERENCES:
patent: 4339774 (1982-07-01), Temple
patent: 4449150 (1984-05-01), Kato
patent: 4654721 (1987-03-01), Goertzel et al.
patent: 4692811 (1987-09-01), Tsuchiya et al.
"An Adaptive Algorithm for Spatial Grey Scale", by Robert Floyd & Louis Steinberg; SID 75 DIGEST, p. 36.

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