Image analysis – Applications
Reexamination Certificate
2008-01-15
2008-01-15
Johns, Andrew W. (Department: 2624)
Image analysis
Applications
C382S232000, C713S176000, C370S527000
Reexamination Certificate
active
10333344
ABSTRACT:
A wavelet domain watermark encoder and decoder embed and detect auxiliary signals in a media signal, such as a still image, video or audio signal. A watermark orientation signal is embedded in a wavelet decomposed signal to facilitate detection of the watermark in a geometrically distorted version of the embedded signal. In some configurations, the watermark signal forms a pattern in a transform domain used to perform synchronization of the watermark. The pattern has attributes used to determine orientation of the watermark in a geometrically distorted version of the media signal. The attributes carry two or more auxiliary message symbols in the watermark, and the attributes both carry the two or more auxiliary message symbols and form the pattern used to perform synchronization of the watermark.
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Ahmed Farid
Alattar Adnan M.
Rhoads Geoffrey B.
Sharma Ravi K.
Digimarc Corporation
Johns Andrew W.
Mackowey Anthony
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