Patent ID: 6104812
Filing Date: 2000-08-15
Classification: G06T,G09C,H04N

Abstract:
A method as implemented on a computer system for digitally producing encoded screens for incorporating secondary information composed of pixels as an anti-counterfeiting security feature into a visible primary image for use on a document, the method comprising the steps of:(a) providing a user selected basic screen;(b) creating an encoded screen from the user selected basic screen and the secondary information by:(1) using the pixels as digital information carriers,(2) modifying a parameter of the digital information carriers, and(3) placing the modified parameter of the digital information carriers within a plurality of color layers of the primary image based on the secondary information,(c) generating a compensated screen containing the secondary information hidden within by compensating the encoded screen for any distortions;(d) screening the primary image with the compensated screen to produce a combined output image in accordance with a reproduction technology corresponding to the user selected encoding principle; and(e) reproducing the document using the reproduction technology, the document incorporating the combined output image.