Method of generating a secure image
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United States of America Patent
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Sep 24, 2024
Grant Date -
Aug 25, 2022
app pub date -
Nov 20, 2019
filing date -
Nov 20, 2019
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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.
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