Patent ID: 6078679
Filing Date: 2000-06-20
Classification: G07D,G07F

Abstract:
A manufacturing method of individual information protecting card conspiring the steps of:(a) placing a multiple image signal and key image signal onto an input plane;(b) producing a basic complex frequency function obtained by a Fourier transform hologram operation;(c) dividing the complex frequency function into an amplitude component and a phase component; and(d) recording the amplitude component and the phase component in combination;wherein the basic complex frequency function is represented by the equationE.sub.SYSTEM (u,v)=2.vertline.K.sub.1 (u,v).parallel.K.sub.2 (u,v).vertline. cos {.phi..sub.K1 (u,v)-.phi..sub.K2 (u,v)-u.delta.x-v.delta.y}where K.sub.1 (u,v) represents the amplitude of the system key pattern in the frequency domain; andK.sub.2 (u,v) represents the amplitude of the system pattern in the frequency domain.