SECURITY ELEMENT, CORRESPONDING ENGRAVED INTAGLIO PRINTING PLATE, AND METHODS AND DEVICES FOR PRODUCING, DECODING AND AUTHENTICATING SECURITY MARKING OF SAID SECURITY ELEMENT
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United States of America
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Feb 20, 2025
app pub date -
Dec 16, 2022
filing date -
Dec 16, 2022
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Abstract
The invention relates to a security marking printed via intaglio process, corresponding engraved intaglio printing plate, and methods and devices for producing, encoding/decoding and authenticating said security marking. The security marking comprising multitone 2D intaglio patterns of intaglio modules containing encoded data according to specific encoding symbols, the decoding of which, together with measured tone values for tiny shifts around their positions at decoding stage on a digital image of said intaglio patterns in correlation with said symbols, provides a robust and precise estimation of a register error between modules of distinct tones, thus allowing to easily detect any fake marking obtained via offset printing, even with a smartphone.
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