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US 2002/0172397 A1Published application
Data encoding using frail watermarks
AssigneeDigimarc Corporation
InventorsGeoffrey B. Rhoads, Ammon E. Gustafson
Life of this patent
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Abstract
Image, video, or audio data is encoded with both a frail and a robust watermark. The two watermarks respond differently to different forms of processing (e.g., copying the object may render the frail watermark unreadable), permitting an original object to be distinguished from a processed object. Appropriate action can then taken in response thereto.
Claims15
A method comprising:
- encoding a set of sampled data with a first watermark that is designed to withstand at least one generation of distortion, and a second watermark that is designed not to withstand even a single generation of distortion;
- and
- distributing the sampled data, or a tangible representation thereof, to the public.
A computer storage medium having instructions stored thereon for causing a computer programmed thereby to perform the following method:
- encoding a set of sampled data with a first, relatively robust, steganographic watermark;
- and
- encoding said set of sampled data with a second, relatively frail, steganographic watermark;
- wherein the first watermark is reliably conveyed with the data notwithstanding various distortions, and the second watermark is lost with such distortions, wherein an original set of said sampled data can be distinguished from a distorted reproduction.
1 more element
Dependencies are inferred from the claim text.