Watermark generator, watermark decoder, method for providing a watermarked signal based on discrete valued data and method for providing discrete valued data in dependence on a watermarked signal

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United States of America Patent

PATENT NO 9917978
SERIAL NO

15344125

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Abstract

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A watermark generator for providing a watermark signal as a sequence of subsequent watermark coefficients based on a stream of subsequent stream values representing discrete valued data includes a differential encoder. The differential encoder is configured to apply a phase rotation to a current stream value of the stream values representing the discrete valued data or to a current watermark symbol, the current watermark symbol corresponding to a current stream value of the stream values representing the discrete valued data, to obtain a current watermark coefficient of the watermark signal. The differential encoder is configured to derive a phase of a previous spectral coefficient of a watermarked signal which is a combination of the host signal and the watermark signal, and to provide the watermark signal such that a phase angle of the phase rotation applied to the current stream value or the current watermark symbol is dependent on the phase of the previous spectral coefficient of the watermarked signal.

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Patent Owner(s)

  • FRAUNHOFER-GESELLSCHAFT ZUR FOERDERUNG DER ANGEWANDTEN FORSCHUNG E.V.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Bliem, Tobias Erlangen, DE 12 72
Borsum, Juliane Erlangen, DE 12 126
Del, Galdo Giovanni Fuerth, DE 28 705
Greevenbosch, Bert Rotterdam, NL 11 78
Kraegeloh, Stefan Erlangen, DE 30 294
Pickel, Joerg Happurg, DE 14 140
Zitzmann, Reinhard Baiersdorf, DE 11 92

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