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US 6,856,693 B2Granted
Watermarking with cone-forest detection regions
AssigneeNEC Laboratories America, Inc.
InventorMatthew L. Miller
Life of this patent
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Abstract
In a watermarking system, an embedder embeds one of several alternative watermark patterns that represent the source message using side information to improve robustness. A detector uses normalized correlation to test all of the patterns, indicating that the source message is present if any one of the patterns is detected. The detection process results in a detection region that is the union of several disjoint cones, or a cone-forest, in media space.
Claims36
A method of embedding a source message as a watermark in a cover Work comprising the steps of:
- identifying a subset of a one-to-many code where each code vector in the subset corresponds to the source message
- applying an extraction process to a cover Work to obtain an extracted vector;
- searching the subset to identify the code vector that yields the highest detection value when compared against the extracted vector;
- creating a mixed vector that is perceptually close to the extracted vector with respect to the cover Work, and that obtains a predetermined robustness value when the mixed vector is compared against the identified code vector;
- and
- applying an inverse extraction process to the mixed vector and to the cover Work to create a watermarked Work.
3 more elements
A method of detecting a message in a Work comprising the steps of
- applying an extraction process to the Work to obtain an extracted vector;
- searching a one-to-many code to find a code vector that yields the highest detection value when compared against the extracted vector;
- and
- identifying a message which has a corresponding subset of the one-to-many code containing the found code vector.
1 more element
Dependencies are inferred from the claim text.