Reference palette embedding

Details Reference palette embedding Reference palette embedding

1998-05-26

2000-02-01

Barron, Jr., Gilberto

Cryptography

Cryptanalysis

380 54, 382232, G09C 500, G06K 936

Patent

active

060211962

ABSTRACT:
A method of embedding auxiliary information into the digital representation of publication quality color-component digital data. The method applies to all digital data for which individual values are represented by discrete numerical values, and for which a corresponding approximation known as a digital reference palette image can be made in terms of a lesser number of discrete digital data values. The invention creates an intermediate, digital, color-component difference image that allows steganographic methods to hide or embed the auxiliary data. The invention secures the auxiliary data from detection and from unauthorized removal or use by means of the digital reference palette image and a steganographic key. By a substantially reverse process, the embedded auxiliary data can be retrieved easily by an authorized user. The invention provides for a means to combine a removable, visible digital watermark with publication quality digital image data.

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Walter Bender et al., "Techniques for Data Hiding," in Proceedings of the SPIE, Storage and Retrieval for Image and Video Databases III, vol. 2420, . 164-173, 1995.
Maxwell T. Sandford II et al., "Modular Error Embedding," U.S. Patent Application No. 08/646,837, filed May 8, 1996.

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