Sensing data from physical objects
First Claim
Patent Images
1. A method comprising the acts:
- sending challenge data from a first device to a second device;
at the second device, obtaining response data by reference to said challenge data and a physical object, wherein said obtaining includes capturing reflected non-coherent illumination from the object with a 2D photosensor to produce image data, and processing said image data; and
checking said response data against expected data to produce result data;
wherein said result data is not dependent on a particular placement of an illumination source relative to both the 2D photosensor and the physical object.
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Abstract
Directional albedo of a particular article, such as an identity card, is measured and stored. When the article is later presented, it can be confirmed to be the same particular article by re-measuring the albedo function, and checking for correspondence against the earlier-stored data. The re-measuring can be performed through us of a handheld optical device, such as a camera-equipped cell phone. The albedo function can serve as random key data in a variety of cryptographic applications. The function can be changed during the life of the article. A variety of other features are also detailed.
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Citations
18 Claims
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1. A method comprising the acts:
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sending challenge data from a first device to a second device; at the second device, obtaining response data by reference to said challenge data and a physical object, wherein said obtaining includes capturing reflected non-coherent illumination from the object with a 2D photosensor to produce image data, and processing said image data; and checking said response data against expected data to produce result data; wherein said result data is not dependent on a particular placement of an illumination source relative to both the 2D photosensor and the physical object. - View Dependent Claims (2, 3, 4, 5, 9, 10, 13)
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6. A method comprising the acts:
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sending challenge data from a first device to a second device; at the second device, obtaining response data by reference to said challenge data and a physical object, said obtaining including capturing image data from the object with a 2D photosensor; and checking said response data against expected data to produce result data; wherein said result data is not dependent on a particular placement of an illumination source relative to both the 2D photosensor and the physical object, and the method further includes determining the relative orientation between said object and said 2D photosensor by reference to said captured image data. - View Dependent Claims (7, 8, 11, 12, 14)
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15. A method comprising:
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producing response data responsive to a physical object and challenge data, said producing including capturing imagery from the physical object using a 2D photosensor, and processing said imagery; and sending said response data to a checking system that can check the response data against expected data; wherein said response data is not essentially dependent on a particular placement of an illumination source relative to both the 2D photosensor and the physical object. - View Dependent Claims (16, 17, 18)
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Specification