Search for a Watermark in a Data Signal
First Claim
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1. Method of searching for a watermark in a data signal, the method comprising:
- determining a search space for the data signal;
selecting a subspace of the search space; and
searching for the presence of the watermark in the subspace.
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Abstract
The invention relates to a method of searching for a watermark in a data signal, and to a watermark detector, such as a copy-control watermark detector. The search is conducted in order to find a watermark in content which possibly has been attacked and/or altered. The search is conducted by the steps of determining or setting a search space for the data signal, selecting a subspace of the search space, and searching for the presence of the watermark in the subspace. The subspace may be selected from a multitude of regions, the selection e.g. being based on a deterministic or probabilistic function.
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14 Claims
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1. Method of searching for a watermark in a data signal, the method comprising:
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determining a search space for the data signal; selecting a subspace of the search space; and searching for the presence of the watermark in the subspace. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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13. Watermark detector for searching for a watermark in a data signal, the watermark detector comprising:
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a search space module for determining or setting the search space for the data signal; a selector module for selecting a subspace; and a detector module for searching for the presence of a watermark in the subspace.
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14. (canceled)
Specification