Method and apparatus for determining document authenticity
First Claim
1. A method for determining the authenticity of a document comprising:
- providing a broadband light source;
illuminating at least a portion of said document with said broadband light source to produce a broadband spectrum of reflected light from said document;
collecting said broadband spectrum of reflected light;
converting said broadband spectrum of reflected light into at least one electrical signal corresponding to said broadband spectrum of reflected light;
generating an intensity value for each of a plurality of different wavelengths of light in the broadband spectrum of reflected light;
digitizing said electrical signals of said broadband spectrum of reflected light;
producing a spectral signature that includes an array of the intensity values; and
comparing said array of intensity values of said spectral signature with an array of reference intensity values of a reference spectral signature to determine an authenticity for said document.
1 Assignment
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Accused Products
Abstract
A method and apparatus for verifying the authenticity of a document relative to a previously programmed document are disclosed. The method provides a broadband light source; illuminates a document with the light source; collects reflected light; converts it into a corresponding electrical signal or signals; digitizes the electrical signals; and prepares a spectral signature of the document for further analysis. The spectral signature can also be normalized to account for variations in analyzed documents caused by soiling and fading. The method also provides for comparing a previously programmed and stored spectral signature to the spectral signature of a test document using a matching value to indicate whether the test document is authentic or not. The apparatus provides a device for application of the method for verifying document authenticity.
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Citations
27 Claims
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1. A method for determining the authenticity of a document comprising:
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providing a broadband light source;
illuminating at least a portion of said document with said broadband light source to produce a broadband spectrum of reflected light from said document;
collecting said broadband spectrum of reflected light;
converting said broadband spectrum of reflected light into at least one electrical signal corresponding to said broadband spectrum of reflected light;
generating an intensity value for each of a plurality of different wavelengths of light in the broadband spectrum of reflected light;
digitizing said electrical signals of said broadband spectrum of reflected light;
producing a spectral signature that includes an array of the intensity values; and
comparing said array of intensity values of said spectral signature with an array of reference intensity values of a reference spectral signature to determine an authenticity for said document. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method for determining the authenticity of a document comprising:
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providing a broadband light source, illuminating at least a portion of said document with said light source to produce reflected light from said document;
collecting said reflected light;
converting said reflected light into at least one electrical signal corresponding to said reflected light;
digitizing said electrical signals of said reflected light;
producing a spectral signature, and wherein said using a matching function step comprises using the equation to compare said spectral signature, wherein Ti and Si respectively represent said produced and said stored spectral signatures.
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19. A method for determining the authenticity of a document comprising:
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providing a broadband light source;
illuminating at least a portion of said document with said light source to produce reflected light from said document;
collecting said reflected light;
converting said reflected light into at least one electrical signal corresponding to said reflected light;
digitizing said electrical signals of said reflected light;
producing a spectral signature; and
normalizing said spectral signature.
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20. A method for determining the authenticity of a document comprising:
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providing a broadband light source;
illuminating at least a portion of said document with said light source to produce reflected light from said document;
collecting said reflected light;
converting said reflected light into at least one electrical signal corresponding to said reflected light;
digitizing said electrical signals of said reflected light;
producing a spectral signature; and
using the equations to normalize said spectral signature.
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21. An apparatus for authenticating a document comprising:
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means for providing a broadband light source;
means for illuminating at least a portion of a document with said broadband light source to produce a broadband spectrum of reflected light from said document;
means for collecting said broadband spectrum of reflected light;
means for converting said broadband spectrum of reflected light into at least one electrical signal corresponding to said broadband spectrum of reflected light;
means for generating an intensity value for each of a plurality of different wavelengths of light in the broadband spectrum of reflected light;
means for digitizing said electrical signals of said broadband spectrum of reflected light;
means for producing a spectral signature that includes an array of the intensity values of said document; and
means for comparing said array of intensity values of said spectral signature with an array of reference intensity values of a reference spectral signature to determine an authenticity for said document. - View Dependent Claims (22, 23, 24, 25, 26, 27)
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Specification