Low visibility watermarks using an out-of-phase color
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United States of America Patent
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Apr 13, 2004
Grant Date -
Feb 21, 2002
app pub date -
Jul 2, 2001
filing date -
May 8, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention relates to digital watermarks. In a preferred embodiment, a media signal is embedded with a digital watermark component. The media signal includes a cyan color plane, a magenta color plane, a yellow color plane, and a black plane. The digital watermark component is embedded in the cyan, magenta, and yellow color planes. The digital watermark component is inverted, and embedded in the black color plane. The resulting watermark is fragile, since signal processing techniques that combine the color planes with the black color plane effectively cancels the watermark signal in local areas. The inventive watermark also includes low-visibility properties, by canceling perceived luminance change in local areas throughout the media signal. In another embodiment, a watermark signal is embedded in a first color scheme to be out-of-color gamut in a second color scheme.
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