19 January 2009 Creating variable data infrared signals for security applications
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Four color printing is the common way to render a color image to paper. This four color printing has certain side effects, among them the metameric representation of colors. This means that a single visual color can be generated through multiple different four color combinations. This is normally considered a problem, however, the problem description can be inverted and information can be embedded in a printed color image that is perceptually invisible under normal illumination, but revealed to an infrared imaging system. This means that certain security aspects can now produced in an essentially cost-neutral way.
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Reiner Eschbach, Reiner Eschbach, Raja Bala, Raja Bala, Martin Maltz, Martin Maltz, Iris Zhao, Iris Zhao, "Creating variable data infrared signals for security applications", Proc. SPIE 7241, Color Imaging XIV: Displaying, Processing, Hardcopy, and Applications, 72411E (19 January 2009); doi: 10.1117/12.811573; https://doi.org/10.1117/12.811573

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