Capturing Physical Feature Data
First Claim
Patent Images
1. A method comprising:
- assessing directional albedo data relating to a surface of a first article; and
storing data corresponding to said assessment for verification of said article.
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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
20 Claims
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1. A method comprising:
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assessing directional albedo data relating to a surface of a first article; and
storing data corresponding to said assessment for verification of said article. - View Dependent Claims (2, 3, 4, 5)
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- 6. A method of issuing driver licenses that includes fabricating a license, and providing same to an applicant, further characterized by, prior to said providing, collecting a unique set of physical measurement data from each license, and storing same in a database, wherein the stored data can later be consulted to identify said license.
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10. 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. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. (canceled)
Specification