Image analysis – Applications
Reexamination Certificate
2005-12-07
2009-10-27
Bhatnagar, Anand (Department: 2624)
Image analysis
Applications
C713S176000
Reexamination Certificate
active
07609849
ABSTRACT:
A method includes generating, for a signal sample, first and second gaussian likelihood functions describing a likelihood of a watermark codeword coefficient value embedded into the signal sample being, respectively, positive and negative. The first gaussian likelihood function has a mean defined by a sum of a local mean value and a watermark strength value and a standard deviation defined by a local standard deviation. The second gaussian likelihood function has a mean defined by a difference between the local mean value and the watermark strength value and the standard deviation defined by the local standard deviation. The method also includes detecting a watermark in an image signal based on a probability of watermark codeword coefficients added to the signal sample being one of positive or negative, the probability being calculated from the first gaussian likelihood function and the second gaussian likelihood function.
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Hooper Daniel Luke
Tapson Daniel Warren
Bhatnagar Anand
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
Sony United Kingdom Limited
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