Bi-level display system

Details Bi-level display system Bi-level display system

1975-05-09

1976-06-01

Richardson, Robert L.

Telegraphy

Systems

Simplex-reversing periodic

315169TV, H04N 566

Patent

active

039611345

ABSTRACT:
Continuous tone images are displayed on a bi-level display device by establishing thresholds for each display element and actuating a particular element when its intensity .phi. bears a predetermine relationship to the established threshold. Thresholds .phi..sub.T are established by determining the average intensity .phi. of picture elements in the neighborhood of a particular display element, and by constraining the average to a narrower range according to a single value function of .phi. such as ##EQU1## WHERE .phi..sub.MAX IS THE MAXIMUM INTENSITY POSSIBLE AND .gamma. IS A CONSTANT WHICH CAN BE DETERMINED SUBJECTIVELY OR WHICH CAN BE RELATED TO THE NOISE IN THE PICTURE AREA.

REFERENCES:
patent: 3647958 (1972-03-01), Sobel
patent: 3843959 (1974-10-01), Owaki et al.
patent: 3845243 (1974-10-01), Schmersal et al.
I.E.E.E. Transactions on Computers vol. 23, Feb. 1974, pp. 184-186.

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