Method of extracting a watermark
First Claim
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1. A method of extracting a watermark which is embedded in an information signal, the information signal representing media content, the method comprising:
- extracting a fingerprint from the information signal, the fingerprint identifying the media content represented by the information signal;
retrieving a previously stored supporting signal pertaining to the information signal based on the fingerprint, the supporting signal being at least a part of an original signal on which the information signal is based, and the supporting signal being mapped to a fingerprint of the original signal; and
detecting the watermark embedded in the information signal based on a difference between the information signal and the supporting signal.
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Abstract
A monitoring station for monitoring distribution of media content, on basis of a watermark, comprises: receiving means for receiving an information signal representing the media content to which the watermark is added; extracting means for extracting perceptual features, identifying the information signal; first retrieving means for retrieving a supporting signal on basis of the perceptual features; second retrieving means for retrieving the watermark on basis of the supporting signal; and comparing means for comparing the watermark with predetermined information.
26 Citations
17 Claims
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1. A method of extracting a watermark which is embedded in an information signal, the information signal representing media content, the method comprising:
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extracting a fingerprint from the information signal, the fingerprint identifying the media content represented by the information signal; retrieving a previously stored supporting signal pertaining to the information signal based on the fingerprint, the supporting signal being at least a part of an original signal on which the information signal is based, and the supporting signal being mapped to a fingerprint of the original signal; and detecting the watermark embedded in the information signal based on a difference between the information signal and the supporting signal. - View Dependent Claims (2, 3)
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4. A method of monitoring distribution of media content in a network based on a watermark, comprising:
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scanning the network for copies of the media content; for each copy of the media content, receiving an information signal representing the copy of the media content; extracting a fingerprint from the information signal, the fingerprint identifying the media content represented by the information signal; retrieving a previously stored supporting signal pertaining to the information signal based on the fingerprint, the supporting signal being at least a part of an original signal on which the information signal is based, and the supporting signal being mapped to a fingerprint of the original signal; detecting a watermark embedded in the information signal based on a difference between the information signal and the supporting signal; extracting monitoring information from the watermark; matching the monitoring information with predetermined information; and establishing a copyright violation based on the comparison. - View Dependent Claims (5, 6, 7, 8)
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9. A monitoring station for monitoring distribution of media content in a network based on a watermark, the monitoring station comprising:
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scanning means configured to scan the network for media content; receiving means configured to receive, for each copy of the media content, an information signal representing the media content; first extracting means configured to extract a fingerprint from the information signal, the fingerprint identifying the media content represented by the information signal; retrieving means configured to retrieve a supporting signal pertaining to the information signal based on the fingerprint, the supporting signal being at least a part of an original signal on which the information signal is based, and the supporting signal being mapped to a fingerprint of the original signal; first detecting means configured to detect a watermark embedded in the information signal based on the supporting signal; second extracting means configured to extract first monitoring information from the watermark; and comparing means configured to match the monitoring information with predetermined information, wherein the comparing means is further configured to establish a copyright violation based on the comparison. - View Dependent Claims (10, 11, 12, 13)
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14. A method for distributing media content in a network, the method comprising:
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receiving a request for media content from an original buyer; retrieving an original signal representing the media content; determining a fingerprint from the original signal corresponding to the media content; creating a watermark comprising monitoring information; embedding the watermark into the original signal; and storing a supporting signal that is at least a part of the original signal in a database and wherein the supporting signal is mapped to the fingerprint corresponding to the original signal; and providing an information signal comprising the original signal having the watermark embedded therein to the original buyer. - View Dependent Claims (15)
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16. A system for media content distribution, comprising:
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a website configured to receive a request for media content from an original buyer; a watermark embedding unit configured to retrieve an original signal representing media content; a fingerprint unit configured to determine a fingerprint from the original signal corresponding to the media content; the watermark embedding unit configured to create a watermark comprising monitoring information and embedding the watermark into the original signal; and a database configured to store a supporting signal that is at least a part of the original signal in a database and wherein the supporting signal is mapped to the fingerprint corresponding to the original signal, wherein the watermark embedding unit is further configured to provide an information signal comprising the original signal having the watermark embedded therein to the original buyer. - View Dependent Claims (17)
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Specification