Object authentication
First Claim
Patent Images
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.
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Abstract
A device detects multi-spectral imaging by using scan elements. The device may include an illumination module and a detection module to detect light scattered from an object illuminated by the illumination module. The device may also include an array of light sources to produce light at a plurality of different wavelengths, and create a line of illumination with each of the different wavelengths. The light detection may be applied to authenticate and validate documents, such as banknotes moving along a document conveyer.
49 Citations
20 Claims
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1. A method for authenticating an object, comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 16, 17)
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7. A method for authenticating an object, comprising:
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illuminating the object with a plurality of wavelengths of light from a plurality of light-emitting sources wherein illuminating the object comprises simultaneously modulating the light-emitting sources using a plurality of orthogonal sequence codes; detecting light scattered from the illuminated object with a plurality of photodiodes to create a multi-spectrum image of at least a specified portion of the illuminated object, wherein creating the multi-spectrum image comprises demodulating the light scattered from the illuminated object using the plurality of orthogonal sequence codes, and wherein the multi-spectrum image comprises a plurality of images associated with one or more of the plurality wavelengths; comparing the multi-spectrum image to a template multi-spectrum image of an authentic object; and determining if the illuminated object is authentic based on the comparison. - View Dependent Claims (8, 9, 10, 11, 18, 19)
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12. An apparatus for authenticating an object comprising:
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a memory; a processor coupled to the memory, and configured to; modulate 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; detect a light signal from the illuminated object with a plurality of photodiodes; produce a reflectance spectrum from the light signal, wherein producing the reflectance spectrum comprises demodulating the light signal using the plurality of orthogonal sequence codes; compare the reflectance spectrum to a template reflectance spectrum of an authentic object; and determine if the illuminated object is authentic as a function of the comparison. - View Dependent Claims (13, 14, 15, 20)
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Specification