Patent · US Active

Method of generating a secure image

US12101450B2 · kind B2 · utility

0Cited by

1References

20Claims

0Family size

Assignee

ASSA ABLOY AB · SE

Inventors

Hermann Hecker · Berlin, DE
Frantz Mercier · Hollister, US

Key dates

Filing date	Nov 20, 2019
Grant date	Sep 24, 2024
Priority date	—
Expiry date	Jan 14, 2041

Classification

Technology area (CPC G)Physics
CPC primaryG06T2201/0061
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

A secure image for a security document is generated by performing a rasterization process for each of a plurality of mono-color base images using a plurality of different threshold functions. For each base image, the plurality of threshold functions cover different intensity regions and result in a complex rasterization pattern depending on the intensity of the input image. The resulting binary images obtained by the rasterization process are combined using offset printing with fluorescent inks of different colors, to result in a multi-color fluorescent output image including a plurality of different complex rasterization patterns.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.