Watermark detection
First Claim
Patent Images
1. A method of detecting a watermark in an image, comprising the acts of:
- partitioning the image into a sequence of blocks having a predetermined size;
accumulating said blocks;
computing a value indicative of the correlation of said accumulated blocks and said watermark having said predetermined size; and
detecting whether said correlation value is larger than a predetermined threshold.
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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.
22 Citations
10 Claims
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1. A method of detecting a watermark in an image, comprising the acts of:
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partitioning the image into a sequence of blocks having a predetermined size;
accumulating said blocks;
computing a value indicative of the correlation of said accumulated blocks and said watermark having said predetermined size; and
detecting whether said correlation value is larger than a predetermined threshold. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An arrangement for detecting a watermark in an image, comprising:
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partitioning means for partitioning the image into a sequence of blocks having a predetermined size;
accumulation means for accumulating said blocks;
correlation computing means for computing avalue indicative of the correlation of said accumulated blocks and said watermark having said predetermined size; and
a detector for detecting whether said correlation value is larger than a predetermined threshold.
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10. A device for recording and/or reproducing an image signal, comprising means for disabling recording and/or reproduction of the image signal in dependence upon the presence of a watermark in the image signal, characterized in that the device comprises an arrangement for detecting said watermark in the image signal comprising:
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partitioning means for partitioning the image signal into a sequence of blocks having a predetermined size;
accumulation means for accumulating said blocks;
correlation computing means for computing a value indicative of the correlation of said accumulated blocks and said watermark having said predetermined size; and
a detector for detecting whether said correlation value is large than a predetermined threshold.
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Specification