Patent ID: 8587832
Filing Date: 2013-11-19
Classification: B42D,G06K,H04N

Abstract:
1. A dual color matching feedback control method for hiding infrared markings conveying information within a combination of at least two colors, said method comprising: measuring at least two colors of varying contrast mixed to hide infrared markings utilizing an inline spectrophotometer sensor in order to thereafter adjust the contrast of black toner for each of the said at least two colors to match each other in color appearance when mixed together, wherein at least one color provides infrared markings and at least one other color provides surrounding colorant to hide the infrared markings; selecting a customized color from a smaller gamut of darker color and maintaining a sufficient difference in black toner between said at least two colors to provide a sufficient contrast for an infrared detection of the infrared markings from the surrounding colorant while minimizing detectability of the infrared markings by an average observer by maintaining a close match between the at least two colors; and providing an initial match by incorporating a color model that is similar to a predicted color mixture in order to thereafter render and adjust said at least two colors for a closer match prior to rendering the infrared markings with the surrounding colorant in a manner that will enable infrared detection of the infrared markings given the difference in black toner provided between the at least two colors while minimizing detectability of the infrared markings by an average observer by maintaining a close match between the at least two colors.