Patent ID: 7852515
Filing Date: 2010-12-14
Classification: H04N

Abstract:
1. A method for creation of an infrared mark to be printed by a printing device as an image on a substrate for embedding information in printed documents, the method comprising: providing a substrate reflective of infrared; selecting at least one background color mixture for the infrared mark; selecting at least one foreground color mixture for the infrared mark, the at least one foreground color mixture exhibiting low contrast against the at least one background color mixture under normal illumination, and high contrast against the at least one background color mixture under infrared illumination; selecting at least one distraction color mixture for the infrared mark, the at least one distraction color mixture comprised of at least two colors, the at least one distraction color mixture having a substantially negligible effect on the infrared response of the foreground and background color mixtures, as well as having a substantially noticeable visual response under normal illumination of the least one foreground color mixture and the least one background color mixture; and, creating an infrared mark on the substrate using the foreground color mixture against the background color mixture in close spatial proximity, with a distraction pattern using the distraction color mixture as collocated with the foreground color mixture against the background color mixture.