Watermark detection
AssigneeKoninklijke Philips Electronics N.V.
InventorsJaap Haitsma, Antonius Kalker, Adrianus Denissen
Life of this patent
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Abstract
An improved method and arrangement for detecting a watermark in an information (e.g. image or video) signal are disclosed. The detection is more reliable and less vulnerable to image processing by partitioning the image into a sequence of blocks having a predetermined size, accumulating the blocks, computing a value indicative of the correlation of the accumulated blocks and the watermark having the predetermined size, and detecting whether the correlation value is larger than a predetermined threshold.
Claims11
1-8. (canceled)
A method of detecting a watermark in an information signal, comprising the acts of:
- partitioning the information signal into a sequence of blocks having a predetermined size;
- accumulating the blocks;
- computing a value indicative of the correlation of the accumulated blocks and the watermark having the predetermined size;
- and
- detecting whether the correlation value is larger than a predetermined threshold.
An arrangement for detecting a watermark in an information signal, comprising:
- partitioning means for partitioning the information signal into a sequence of blocks having a predetermined size;
- accumulation means for accumulating the blocks;
- correlation computing means for computing a value indicative of the correlation of the accumulated blocks and the watermark having the predetermined size;
- and
- a detector for detecting whether the correlation value is larger than a predetermined threshold.
A device for recording and/or reproducing an information signal, comprising means for disabling recording and/or reproduction of the information signal in dependence upon the presence of a watermark in the information signal, characterized in that the device comprises an arrangement for detecting the watermark in the information signal comprising:
- partitioning means for partitioning the information signal into a sequence of blocks having a predetermined size;
- accumulation means for accumulating the blocks;
- correlation computing means for computing a value indicative of the correlation of the accumulated blocks and the watermark having the predetermined size;
- and
- a detector for detecting whether the correlation value is larger than a predetermined threshold.
Dependencies are inferred from the claim text.