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US 2003/0149879 A1Published application
Reversible watermarking
AssigneeDigimarc Corporation
InventorsJun Tian, Stephen K. Decker
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AssigneeDigimarc Corporation
InventorsJun Tian, Stephen K. Decker
Estimating the term…
A reversible watermarking method embeds auxiliary data into a data set, such as an image, audio, video or other data, in a manner that enables full recovery of the original, un-modified data set. This method may be used to determine whether the data set has been tampered. To improve embedding capacity without the need for compression of the auxiliary data, the method uses an expansion technique. One particular approach exploits the correlation or redundancy within the data set to convert the data to a set of small, expandable values, such as difference values. These small values are then expanded by inserting auxiliary data as one or more additional bits, increasing the number of bits without causing an underflow or overflow. This approach also uses a property of the data set that is invariant to the embedding operation to identify embedding locations, obviating the need for separate data to identify where data is embedded in a data set.
A method of reversibly embedding auxiliary data in a data set comprising:
A method of reading auxiliary data reversibly embedded in a data set and restoring the data set to the same values as before the reversible embedding, the method comprising:
A method of reversibly embedding auxiliary data in a data set comprising:
A method of decoding reversibly embedded auxiliary data in a data set comprising:
A method of embedding auxiliary data in a data set comprising:
A method of decoding auxiliary data from an embedded data set comprising:
Dependencies are inferred from the claim text.