Method and apparatus for reduction of false contours in electric

Details Method and apparatus for reduction of false contours in electric Method and apparatus for reduction of false contours in electric

1979-11-05

1981-01-13

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358280, 364515, H04N 140

Patent

active

042452589

ABSTRACT:
An electrical screening system for binary displays or binary graphic recording systems is disclosed which suppresses false contours. The suppression is achieved by increasing the number of gray levels that a given m.times.n matrix of pixels can represent. Each pixel can only represent one of two gray levels in a binary display or graphic system. A conventional m.times.n halftone cell is able to reproduce m.times.n+1 gray levels. The extra gray levels above the m.times.n+1 quantity are achieved for a given m.times.n halftone cell by dynamically changing the values of the m.times.n screen signals associated with a halftone cell. The amount of the change is limited to a value between zero and D inclusive where D is the difference between two adjacent screen signal values.

REFERENCES:
patent: 3294896 (1966-12-01), Young
patent: 3739082 (1973-06-01), Lippel
patent: 3916096 (1975-10-01), Everett
patent: 4184206 (1980-01-01), Harano
patent: 4205341 (1980-05-01), Mitsuya
IRE Transactions on Information Theory, Feb. 1962, pp. 145-154, "Picture Coding Using Pseudo-Random Noise"--L. G. Roberts.
Proceeding of the S.I.D., vol. 15/4, Fourth Quarter 1974 pp. 161-169, C. N. Judice et al., "Using Ordered Dither To Display Continuous Tone Pictures on an AC Plasma Panel".
Proceeding of the S.I.D., vol. 19/3, Third Quarter 1978, pp. 127-131, R. W. Pryor et al., "Bilevel Image Displays--A new Approach".

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