Patent ID: 7487915
Filing Date: 2009-02-10
Classification: G02B,G07D

Abstract:
1. A reflective decoding device for use in decoding an encoded image comprising a latent image encoded using at least one encoding parameter, the device comprising: a substrate with a reflective surface portion having a surface topography comprising a predetermined pattern of topographical features, the predetermined pattern being configured with at least one geometric characteristic corresponding to the at least one encoding parameter so that placement of a light-transmissive sheet having the encoded image formed thereon over the predetermined pattern of topographical features allows the latent image to be viewed from any angle, wherein the predetermined pattern of topographical features comprises an array of regularly spaced discrete variations in surface geometry comprising at least one of the set consisting of discrete recesses and discrete protrusions relative to a nominal surface level, the array having a predetermined spacing frequency in at least one dimension along the reflective surface.