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...

2005-04-05

2008-08-19

LaRose, Colin (Department: 2624)

Image analysis

Applications

Reexamination Certificate

active

07415128

ABSTRACT:
A low-frequency, temporally asymmetric watermark carrier decreases in luminance at a slower rate than it increases in luminance. 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), Podilchuck et al.
patent: 2002/0076083 (2002-06-01), Levy
patent: 2002/0090110 (2002-07-01), Braudway et al.
patent: 2004/0064702 (2004-04-01), Yu et al.
Gonzalez et al. Digital Image Processing, 2nd Edition. Prentice-Hall, 2002, pp. 42-45.

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