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 step converts the message to an FSK signal and the attribute is a set of two or more FSK signaling frequencies of the FSK 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
27 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 step converts the message to an FSK signal and the attribute is a set of two or more FSK signaling frequencies of the FSK signal; and
applying the watermark signal to the host signal. - View Dependent Claims (2, 3, 4)
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5. A method of embedding a digital watermark in an image comprising:
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converting a message into a digital watermark signal having an attribute that orients the watermark in the image, wherein said converting step converts the message to an FSK signal and the attribute is a set of two or more signaling frequencies; and
applying the watermark signal to the image. - View Dependent Claims (6, 7, 8)
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9. A method of embedding a digital watermark in an audio signal comprising:
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converting a message into a digital watermark signal having an attribute that orients the watermark in the audio signal, wherein said converting step converts the message to an FSK signal; and
applying the message to the audio signal. - View Dependent Claims (10, 11)
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12. 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 step converts the message to an FSK signal and the attribute is an FSK signaling frequency; and
applying the watermark signal to the host signal. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A method of decoding a digital watermark in a host signal, wherein the watermark comprises an FSK signal, and wherein the watermark includes a message that is encoded by converting symbols to selected FSK signaling frequencies, said method comprising:
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using an attribute of the watermark to determine orientation of the watermark in a host signal, the attribute being used to determine orientation and to carry a message; and
decoding the watermark. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27)
reading a message encoded in the watermark.
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20. The method of claim 18 wherein the attribute is a signaling frequency.
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21. The method of claim 20 wherein the signaling frequency facilitates detection of scale of the watermark in the host signal.
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22. The method of claim 20 wherein the signaling frequency facilitates detection of rotation angle of the watermark in the host signal.
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23. The method of claim 18 wherein the watermark has two or more components, each having a phase offset;
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using the phase offset to determine position of the message in the host signal.
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24. The method of claim 18 wherein the watermark has two or more components, each having a set of FSK signaling frequencies;
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using the signaling frequencies to determine position of the message in the host signal.
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25. The method of claim 18 wherein the watermark includes a known message, and
using the known message to identify a position of the watermark in the host message. -
26. The method of claim 18 wherein the host signal is an image signal.
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27. The method of claim 18 wherein the host signal is an audio signal.
Specification