Digital watermarking apparatus and methods
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United States of America Patent
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Jan 16, 2007
Issued Date -
N/A
app pub date -
Feb 17, 2005
filing date -
Apr 24, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
The present invention relates to various steganographic methods and apparatus. In one embodiment, a plurality of microlenses can provide a steganographic signal for a handheld device. The pattern corresponds to (or conveys) a device identifier. In another embodiment, a handheld computing device includes: a plurality of pixel elements; a set of microlenses; and electronic circuitry communicating with the set of microlenses. The set of microlenses are arranged to create a pattern, the pattern providing a plural-bit identifier. The electronic circuitry operates to change the unique identifier. Other embodiments are also provided.
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