Method and apparatus for providing an asymmetric watermark...

Details Method and apparatus for providing an asymmetric watermark... Method and apparatus for providing an asymmetric watermark...

2005-04-26

2005-04-26

Bali, Vikkram (Department: 2623)

Image analysis

Applications

Reexamination Certificate

active

06885757

ABSTRACT:
A low-frequency, temporally asymmetric watermark carrier decreases in luminance in a substantially monotonic manner more slowly than it increases in luminance in a substantially monotonic manner. This allows the carrier to be embedded, e.g., in a video work, in a manner that renders the resultant watermark virtually invisible to the human eye. Moreover, the resultant watermark is substantially resistant to common pirating techniques in which high-frequency visual content (e.g., including watermark data) tends to be filtered out by piracy processing.

REFERENCES:
patent: 6778678 (2004-08-01), Podilchuk et al.
patent: 20020090110 (2002-07-01), Braudaway et al.

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