Method for optical authentication and identification of objects and device therefor
First Claim
1. A method of optical authentication and identification of objects, comprising:
- illuminating with coherent light a volume-wise at least partially scattering surface of reference objects under specified illumination conditions, recording the speckle patterns thus obtained for various nominal values of illumination parameters and also in a range of values around these nominal values, then, upon the verification of other objects or of the same objects, in illuminating these objects under the same nominal conditions and comparing each time the speckle pattern thus obtained with those which were recorded and retaining the objects if their speckle pattern corresponds to one of those that was recorded.
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Abstract
The method in accordance with the invention consists in illuminating with coherent light a volume-wise at least partially scattering surface of reference objects under specified illumination conditions, in recording the speckle patterns thus obtained for various nominal values of illumination parameters and in a range of values around these nominal values, then, upon the verification of other objects or of the same objects, in illuminating these objects under the same nominal conditions and in comparing each time the speckle pattern thus obtained with those which were recorded and in retaining the objects if their speckle pattern corresponds to one of those that was recorded.
75 Citations
20 Claims
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1. A method of optical authentication and identification of objects, comprising:
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illuminating with coherent light a volume-wise at least partially scattering surface of reference objects under specified illumination conditions, recording the speckle patterns thus obtained for various nominal values of illumination parameters and also in a range of values around these nominal values, then, upon the verification of other objects or of the same objects, in illuminating these objects under the same nominal conditions and comparing each time the speckle pattern thus obtained with those which were recorded and retaining the objects if their speckle pattern corresponds to one of those that was recorded. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A device for the optical authentication and identification of objects, comprising:
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an optical recording device with laser source, a storage device and an optical reading device with laser source, whose illumination beam illuminates the objects and whose optical device forms on the detector of the reading device an image of the illuminated area of these objects, parameters of these optical devices being modifiable. - View Dependent Claims (20)
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Specification