Self-orienting watermarks
First Claim
Patent Images
1. A method of embedding a digital watermark in a host signal comprising:
- converting a message into a digital watermark signal having an attribute that orients the watermark in the host signal, wherein said converting modulates the message using shift key modulation and the attribute is at least one frequency of the shift key modulated signal; and
applying the watermark signal to the host signal.
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Abstract
A watermarking method converts a watermark message into a Frequency Shift Keying (FSK) signal and embeds the FSK signal in a host signal. The spectral properties of the FSK watermark signal facilitate its detection, even in applications where the watermarked signal is corrupted. Because of these properties, the FSK watermark signal can perform the dual function of identifying the watermark'"'"'s presence and orientation in potentially corrupted media, and also conveying a hidden message in the host signal. Such a watermark may be referred to as a self-orienting watermark.
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Citations
20 Claims
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1. A method of embedding a digital watermark in a host signal comprising:
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converting a message into a digital watermark signal having an attribute that orients the watermark in the host signal, wherein said converting modulates the message using shift key modulation and the attribute is at least one frequency of the shift key modulated signal; and
applying the watermark signal to the host signal. - View Dependent Claims (2, 3, 4, 14)
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5. A method of embedding a digital watermark in audio comprising:
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converting a message into a digital watermark signal having an attribute that orients the watermark in the audio, the converting encoding the message in a carrier, including using shift key modulation to form a modulated signal, and the attribute is spectral attribute of the modulated signal; and
embedding the modulated signal in the audio by modifying the host according to the modulated signal. - View Dependent Claims (6, 7, 8, 9)
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10. A method of embedding a digital watermark in a host signal comprising:
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converting a message into a digital watermark signal having an attribute that orients the watermark in the host signal, wherein said converting modulates the message with shift key modulation and the attribute is a spectral property of the modulated signal; and
applying the watermark signal to the host signal. - View Dependent Claims (11, 12, 13)
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15. A method of decoding a digital watermark in a host signal, wherein the watermark comprises a modulated signal, and wherein the watermark includes a message that is encoded by modulating symbols onto a carrier signal, said method comprising:
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using a relationship of spectral attributes of the watermark to determine orientation of the watermark in a host signal, the spectral attributes being used to determine orientation and to carry a message; and
decoding the watermark. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification