Patent ID: 8260027
Filing Date: 2012-09-04
Classification: G07D

Abstract:
1. A method for authenticating a bill, comprising; a first comparing step of irradiating light having a predetermined wavelength onto a print area of a surface of a genuine bill from a light emitting unit, storing in advance transmitted fight data of light transmitted through the genuine bill as reference data, irradiating light having the predetermined wavelength onto a print area of a surface of a bill to be authenticated from a light emitting unit, and comparing transmitted light data of light transmitted through the bill with the reference data; and a second comparing step of determining in advance at least two specific regions in a print area of a surface of a bill, wherein the at least two specific regions have different invisibility under red visible light and under infrared light, applying a predetermined weighting to the transmitted light data of light in the at least two specific regions of the bill to be authenticated and the genuine bill, and comparing the weighted data with each other, wherein based on comparison results in the first and second comparing steps, the bill is authenticated, wherein the at least two specific regions include a watermark region and at least one region selected from the group consisting of latent image region, a special print region, and an infrared transmission region.