Image halftoning system for printers

Details Image halftoning system for printers Image halftoning system for printers

1988-05-20

1989-09-19

Evans, Arthur G.

Recorders

Electric recording

Electrochemical

346154, 346160, G01D 1500

Patent

active

048685879

ABSTRACT:
Trinary and quaternary halftone reproduction systems for electronic printers in which discrete combinations of either three or four reflectance level pixels having optimum intermediate levels form halftone cells to provide an increased number of gray steps for processing image signals, yielding an optimum Tone Reproduction Curve.

REFERENCES:
patent: 4078929 (1978-03-01), Gundlach
patent: 4434431 (1984-02-01), Ohkubo et al.
patent: 4491875 (1985-01-01), Kawamura
patent: 4619518 (1986-10-01), Kameyama et al.
patent: 4630918 (1986-12-01), Yui et al.
patent: 4651287 (1987-03-01), Tsao
Fundamentals of Digital Copiers; Canon--Oct. 1984.

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