Patent Document ID: 20130335783
Application ID: 13526820
Patent Status: 0

Claim One:
1. A print media having visibly hidden content embedded in image content, comprising: the print media comprising both image content and hidden data; the image content printed with one or more normal printing process colorants to provide images or text; the hidden data provided by selective printing of at least one spectral edge marker material onto at least one image region of the print media to provide visually hidden data, where the spectral edge marker material has a substantial spectral absorption just outside the human visible spectrum; and where the at least one normal printing process colorant is at least printed on the print media in regions that are both overlapping with and adjacent to the image regions having the at least one selectively printed spectral edge marker material, such that image regions having only the at least one normal printing process colorant and the image regions having the at least one selectively printed spectral edge marker material and the at least one normal printing process colorant are color matched; an image capture device directed at the print media, the image capture device having a visible spectral response which includes both red, green, and blue spectrally distinct imaging channels and an overall spectral response including a spectral region just outside the visible spectrum; and wherein the image capture device detects the at least one spectral edge marker material ink using at least one spectrally distinct color imaging channel having a spectral response inclusive of at least a portion of the spectral absorption of the at least one spectral edge marker material.