Halftoning implementation for interactive image editing

Details Halftoning implementation for interactive image editing Halftoning implementation for interactive image editing

1981-09-08

1987-11-10

Curtis, Marshall M.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340793, 358138, 358283, G09G 100, G09G 300

Patent

active

047060778

ABSTRACT:
A circuit for producing a "knight ordered dither" halftone pattern for a CRT and a "double spiral" halftone pattern for a xerographic printer is described. The circuit comprises a RAM for storing the threshold values, a comparator, and supporting addressing and logic parts. Also described are a program for allowing the operator to interactively generate threshold patterns, and several knight tour patterns specifically designed for a CRT using interlaced rasters.

REFERENCES:
patent: 3953668 (1976-04-01), Judice
patent: 4032978 (1977-06-01), Wong
patent: 4193096 (1980-03-01), Stoffel
patent: 4214277 (1980-07-01), Urich
patent: 4258393 (1981-03-01), Ejiri et al.
IEEE Transactions on Communications, vol. COM-25, No. 11, Nov. 1977, pp. 1433-1440, New York, U.S.; C. N. Judice: "Digital Video: A Buffer-Controlled Dither Processor for Animated Images" *Sections, 2, 6; FIG. 1*.
Proceedings of the S.I.D., vol. 17, No. 2, 2nd quarter 1976, pp. 115-121; B. Lippel: "Two-and Three-Dimensional Ordered Dither in Bi-Level Picture Displays" *Sections III, V*.

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