Document processing methods
First Claim
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1. A method comprising:
- receiving a card, the card having a set of plural physical features that, in the aggregate, define an initial state;
applying a stimulus to the card, said stimulus causing plural of said physical features to change, thereby defining a second state of said set of features; and
storing data related to said second state;
wherein said sets of physical features comprise sets of directional albedo features.
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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.
18 Citations
21 Claims
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1. A method comprising:
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receiving a card, the card having a set of plural physical features that, in the aggregate, define an initial state; applying a stimulus to the card, said stimulus causing plural of said physical features to change, thereby defining a second state of said set of features; and storing data related to said second state; wherein said sets of physical features comprise sets of directional albedo features. - 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 of customizing a card comprising:
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applying laser irradiation to first regions of said card from a first direction; and applying laser irradiation to second regions of said card from a second, different, direction; wherein said applying of laser irradiation causes directional albedo parameters of the card to change.
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19. A method comprising:
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receiving a card from an individual owner thereof; applying a first stimulus to the card to change physical attributes thereof from an initial state to an intermediate state; applying a second, different stimulus to the card to change physical attributes thereof from the intermediate state to an ending state; and storing data relating to the ending state of said physical attributes; wherein said physical attributes comprise directional albedo parameters. - View Dependent Claims (20, 21)
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Specification