Sensing data from physical objects
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United States of America Patent
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Jul 17, 2012
Grant Date -
May 15, 2008
app pub date -
Apr 24, 2007
filing date -
Jan 23, 2006
priority date (Note) -
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status (Latency Note)
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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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