Reducing watermark perceptibility and extending detection distortion tolerances
First Claim
1. An apparatus comprising:
- means for storing data representing video;
means for embedding a first watermark signal in a first portion of stored data, the first watermark signal comprising a first signal polarity and corresponding to first detection preconditioning;
means for embedding a second watermark signal in a second portion of the stored data, the second watermark signal comprising a second signal polarity that is inversely related to the first signal polarity and corresponding to second detection preconditioning;
means for controlling provision of the watermarked video for display in real time, in which temporal averaging of the first watermark signal and second watermark signal over time conceals the first watermark signal and the second watermark signal from a human observer of the video.
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Abstract
The present disclosures relates generally to digital watermarking and data hiding. One claim recites an apparatus comprising: means for storing a watermark signal; means for embedding a watermark signal in a first portion of a video signal; means for preconditioning the watermark signal in a first manner to allow expanded detection of said preconditioned watermark signal in the presence of first distortion; means for embedding the watermark signal preconditioned in the first manner in a second portion of the video signal; means for preconditioning the watermark signal in a second manner to allow expanded detection of said preconditioned watermark signal in the presence of second distortion; and means for embedding the watermark signal preconditioned in the second manner in a third portion of the video signal. Of course, other claims are provided too.
67 Citations
16 Claims
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1. An apparatus comprising:
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means for storing data representing video; means for embedding a first watermark signal in a first portion of stored data, the first watermark signal comprising a first signal polarity and corresponding to first detection preconditioning; means for embedding a second watermark signal in a second portion of the stored data, the second watermark signal comprising a second signal polarity that is inversely related to the first signal polarity and corresponding to second detection preconditioning; means for controlling provision of the watermarked video for display in real time, in which temporal averaging of the first watermark signal and second watermark signal over time conceals the first watermark signal and the second watermark signal from a human observer of the video. - View Dependent Claims (2, 3)
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4. An apparatus comprising:
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means for storing data representing video; means for embedding a watermark signal in a first portion of stored data, the embedding using a first embedding bump size; means for embedding a watermark signal in a second portion of the stored data, the embedding using a second embedding bump size, in which the first embedding bump size corresponds with a first detection range distance when capturing optical scan data associated with the video as it is being rendered on a display, and the second embedding bump size corresponds with a second, larger detection range distance when capturing optical scan data associated with the video as it is being rendered on the display; means for controlling provision of the watermarked video to a display. - View Dependent Claims (5, 6, 7, 8, 9)
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10. An apparatus comprising:
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means for storing a watermark signal; means for embedding a watermark signal in a first portion of a video signal; means for preconditioning the watermark signal in a first manner to allow expanded detection of said preconditioned watermark signal in the presence of first distortion; means for embedding the watermark signal preconditioned in the first manner in a second portion of the video signal; means for preconditioning the watermark signal in a second manner to allow expanded detection of said preconditioned watermark signal in the presence of second distortion; means for embedding the watermark signal preconditioned in the second manner in a third portion of the video signal. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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Specification