System and method for extracting a watermark signal in a digital image sequence
OwnerGabriel Fielding, Paul W. Jonesinventors
Life of this patent
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Abstract
A method for extracting a watermark signal contained in a watermarked digital image sequence having two or more frames, including the steps of estimating correspondences between one or more pairs of frames in the watermarked digital image sequence; computing a displaced frame difference for one or more frames in the watermarked digital image sequence using the correspondences; and extracting the watermark signal from one or more displaced frame differences.
Claims18
A method for extracting a watermark signal contained in a watermarked digital image sequence, having two or more frames, comprising the steps of:
- a) estimating correspondences between one or more pairs of frames in the watermarked digital image sequence;
- b) computing a displaced frame difference for one or more frames in the watermarked digital image sequence using the correspondences computed in step a);
- and
- c) extracting the watermark signal from one or more displaced frame differences.
A system for extracting a watermark signal contained in a watermarked digital image sequence, having two or more frames, comprising:
- a) means for estimating correspondences between one or more pairs of frames in the watermarked digital image sequence;
- b) means for computing a displaced frame difference for one or more frames in the watermarked digital image sequence using the correspondences computed in step a);
- and
- c) means extracting the watermark signal from one or more displaced frame differences.
Dependencies are inferred from the claim text.