Detection of out-of-phase low visibility watermarks
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United States of America Patent
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Jul 13, 2004
Issued Date -
N/A
app pub date -
Aug 20, 2001
filing date -
May 8, 1995
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Abstract
The present invention relates to detecting digital watermarks. In a preferred embodiment, media is embedded with a digital watermark component. The media includes a cyan color plane, a magenta color plane, a yellow color plane, and a black color plane. The digital watermark component is embedded in the cyan, magenta, and yellow color planes. The digital watermark component is inverted and is embedded in the black color plane. The embedded media is illuminated with infrared light, which emphasizes the black color plane. An input device captures a digital image of the illuminated media. The digital watermark component is detected from the emphasized black plane.
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