Screen for reproducing continuous-tone pictures

Details Screen for reproducing continuous-tone pictures Screen for reproducing continuous-tone pictures

1983-02-14

1985-02-05

Orsino, Jr., Joseph A.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358298, H04N 122

Patent

active

044981082

ABSTRACT:
A screen for reproducing continuous-tone pictures of the kind which has an orthogonal, equally spaced screen structure and which is rotated through 45.degree. from the direction of scanning. In this invention, the individual screen dots are split up into four parts by lines extending parallel and perpendicular to the direction of reproduction which pass through the centers of the screen dots, thus producing square part screen-configuration which, in two opposite corners, each contain covered segments which derive from two different screen dots. Prior to reproduction, one such screen-configuration is stored for each tonal value liable to occur and at the time of reproduction these are called up again for selected tonal values and reproduced under the control of the scanning process.

REFERENCES:
patent: 3688033 (1972-08-01), Hell et al.
patent: 3806641 (1974-04-01), Crooks
patent: 3911480 (1975-10-01), Brucker
patent: 3982949 (1976-09-01), Reymond

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