Embedding and detection of watermark in a motion image signal

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United States of America Patent

PATENT NO 7996678
APP PUB NO 20040250079A1
SERIAL NO

10480339

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Abstract

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A video watermarking scheme is disclosed, which is designed for the digital cinema format, as it will be used on large projector screens in theaters. The watermark is designed in such a way that it has minimal impact on the video quality, but is still detectable after capture with a handheld camera and conversion to, for instance, VHS, CD-Video or DVD format. The proposed watermarking system only exploits the temporal axis. This makes it invulnerable to geometrical distortions generally caused by such a way of capturing. The watermark is embedded by modulating a global property of the frames (e.g. the mean luminance) in accordance with the samples of the watermark. The embedding depth is preferably locally adapted within each frame to local statistics of the respective image. Watermark detection is performed by correlating the watermark sequence with extracted mean luminance values of a sequence of frames.

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Patent Owner(s)

Patent OwnerAddress
NAGRAVISION S A22-24 ROUTE DE GENEVE CHESEAUX-SUR-LAUSANNE 1033

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Haitsma, Jaap Andre Eindhoven, NL 43 2088
Kalker, Antonius Adrianus Cornelis Maria Eindhoven, NL 59 1695

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