Combined watermarking and fingerprinting
First Claim
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1. A method of identifying a content signal comprising:
- using a programmed processor to perform the acts of;
decoding a digital watermark from a received portion of the content signal, including aggregating instances of the digital watermark repeated in the content signal;
the digital watermark serving to identify the content signal and associated content fingerprints for the content signal;
using the content fingerprints to localize the received portion of the content signal;
wherein using the content fingerprints to localize the received portion comprises;
extracting fingerprints from the received portion of the content signal; and
matching extracted fingerprints from the received portion of the content signal with the associated content fingerprints to determine which part of the content signal the digital watermark was detected from.
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Abstract
Content fingerprints and watermarks are combined in various ways for content identification applications. Fingerprints are used to identify content generally while watermarks provide more detailed localization of parts within the content, and vice versa. Fingerprint techniques are further used for signal synchronization and other pre-processing steps to assist in digital watermark decoding. A variety of fingerprint/watermark techniques identify characteristics of the channel of content from content samples.
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Citations
20 Claims
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1. A method of identifying a content signal comprising:
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using a programmed processor to perform the acts of; decoding a digital watermark from a received portion of the content signal, including aggregating instances of the digital watermark repeated in the content signal;
the digital watermark serving to identify the content signal and associated content fingerprints for the content signal;using the content fingerprints to localize the received portion of the content signal;
wherein using the content fingerprints to localize the received portion comprises;extracting fingerprints from the received portion of the content signal; and matching extracted fingerprints from the received portion of the content signal with the associated content fingerprints to determine which part of the content signal the digital watermark was detected from. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. Apparatus for identifying a content signal comprising:
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one or more programmed processors configured to decode a digital watermark from a received portion of the content signal, including aggregating instances of the digital watermark repeated in the content signal;
the digital watermark serving to identify the content signal and associated content fingerprints for the content signal;the one or more programmed processors further configured to use the content fingerprints to localize the received portion of the content signal, including; a processor configured to extract fingerprints from the received portion of the content signal; and a processor configured to match extracted fingerprints from the received portion of the content signal with the associated content fingerprints to determine which part of the content signal the digital watermark was detected from. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification