Method and apparatus for multi-bit zoned data hiding in printed images
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United States of America Patent
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Apr 3, 2001
Grant Date -
N/A
app pub date -
Apr 15, 1998
filing date -
Apr 15, 1998
priority date (Note) -
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Abstract
A technique for embedding a tracking number as a series of bits in a printed image alters characteristic parameter values at a set of pseudo-random locations chosen for each bit in an embedding zone. The alteration markedly changes the expectation value of some linear combination of mathematical functions of the values at that set of locations. A marker bit encoded to a higher certainty than other bits in the string aids in orienting the zones in decoding. The tracking number is detected and identified by exploiting the behavior of sums of a large number of random variables, based on the Patchtrack approach.
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