Patent ID: 9220446
Filing Date: 2015-12-29
Classification: A61B,G06K,G07D,H01L

Abstract:
1. A method for authenticating an object, comprising: modulating a plurality of wavelengths of light from a plurality of light-emitting sources, wherein modulating the plurality of wavelengths of light comprises simultaneously modulating the plurality of wavelengths of light using a plurality of orthogonal sequence codes, and wherein modulating the plurality of wavelengths of light illuminates the object; detecting a light signal from the illuminated object with plurality of photodiodes; producing a reflectance spectrum from the light signal, wherein producing the reflectance spectrum comprises demodulating the light signal using the plurality of orthogonal sequence codes; comparing the reflectance spectrum to a template reflectance spectrum of an authentic object; and determining if the illuminated object is authentic as a function of the comparison.