Title:
METHOD AND APPARATUS FOR PROVIDING AN ASYMMETRIC WATERMARK CARRIER
Document Type and Number:
WIPO Patent Application WO2004114201
Kind Code:
A3
Abstract:
A low-frequency, temporally asymmetric watermark carrier monotonically decreases in luminance more slowly than it monotonically 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.
Inventors:
BLOOM JEFFREY ADAM (US)
NAFZIGER JOHN SCOTT (US)
NAFZIGER JOHN SCOTT (US)
Application Number:
PCT/US2004/019767
Publication Date:
March 24, 2005
Filing Date:
June 21, 2004
Export Citation:
Assignee:
SARNOFF CORP (US)
BLOOM JEFFREY ADAM (US)
NAFZIGER JOHN SCOTT (US)
BLOOM JEFFREY ADAM (US)
NAFZIGER JOHN SCOTT (US)
International Classes:
G06K9/00; G06K; (IPC1-7): G06K9/00
Foreign References:
| US20020090110A1 | 2002-07-11 |
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