Method and apparatus for providing an asymmetric watermark carrier
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United States of America Patent
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Apr 26, 2005
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app pub date -
Jun 21, 2004
filing date -
Apr 18, 2002
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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.
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