Digital watermarking of tonal and non-tonal components of media signals
First Claim
1. A method of embedding a digital watermark in a signal comprising:
- performing tonal detection on the signal to identify tonal components and non-tonal components;
embedding a digital watermark in the tonal and non-tonal components, including performing different watermark embedding methods in the tonal components and the non-tonal components, the different watermarking methods using different methods for modifying the signal to hide data of the digital watermark in the signal.
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Abstract
A digital watermarking method performs tonal detection on a signal (e.g., audio) to identify tonal and non-tonal components. These components are analyzed to compute appropriate weighting of a digital watermark for the tonal and non-tonal components. This tonal detection method is also used in recovering the watermark. A decoding method performs tonal detection on a watermarked signal, computes weights for tonal and non-tonal components, and recovers the embedded watermark using the weights. The same or different watermark embedding schemes may be used to embed digital watermarks in the tonal and non-tonal components. Tonal analysis is used in conjunction with frequency and temporal shaping to adapt the digital watermark to the signal in which it is embedded.
17 Citations
20 Claims
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1. A method of embedding a digital watermark in a signal comprising:
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performing tonal detection on the signal to identify tonal components and non-tonal components; embedding a digital watermark in the tonal and non-tonal components, including performing different watermark embedding methods in the tonal components and the non-tonal components, the different watermarking methods using different methods for modifying the signal to hide data of the digital watermark in the signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of detecting a digital watermark in a signal comprising:
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performing tonal detection on the signal to identify tonal components and non-tonal components; detecting a digital watermark in the tonal and non-tonal components, including performing different watermark detecting methods in the tonal components and the non-tonal components, a first detecting method evaluating the tonal components to detect a first type of modification to the tonal components, and a second detecting method evaluating non-tonal components to detect a second type of modification to the non-tonal components, the first and second types of modifications being different. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method of embedding a digital watermark in a signal comprising:
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performing tonal detection on the signal to identify tonal components and non-tonal components; and embedding a digital watermark in the tonal components by shifting position of the tonal components according to a pattern to embed data into the tonal components. - View Dependent Claims (16, 17)
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18. A method of detecting a digital watermark in a signal comprising:
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performing tonal detection on the signal to identify tonal components and non-tonal components; and evaluating positions of the tonal components to detect shifts in position of the tonal components, the digital watermark being conveyed in the shifts in position of the tonal components. - View Dependent Claims (19, 20)
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Specification