US 6,763,123 · Granted 2004-07-13
Detection of out-of-phase low visibility watermarks
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.
Patent details
- Publication number
- US 6,763,123
- Filing date
- 2001-08-20
- Grant date
- 2004-07-13
- Assignee
- Digimarc Corporation
- Inventor(s)
- REED ALASTAIR M., CATTONE JEREMY
- CPC class
- G06K7/1417
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