Data carrier

Details Data carrier Data carrier

2008-05-27

2008-05-27

St.Cyr, Daniel (Department: 2876)

Registers

Records

C235S494000

Reexamination Certificate

active

07377444

ABSTRACT:
A halftone image original is converted into a line screen halftone image including regularly spaced-apart screen lines5that are modulated in their width y in accordance with the tonal value to be represented. According to the invention, width y of screen lines5is modulated only on one side so that screen lines5are flat on one side and width-modulated on one side. Various examples are stated for how this screen line modulation permits effective copy protection.

REFERENCES:
patent: 5772249 (1998-06-01), Guex et al.
patent: 6396927 (2002-05-01), Phillips
patent: 6417968 (2002-07-01), Staub et al.
patent: 0 353 974 (1990-02-01), None
patent: WO 99/38038 (1999-07-01), None

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