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Proceedings Paper

Integer DCT-based reversible watermarking for images using companding technique
Author(s): Bian Yang; Martin Schmucker; Wolfgang Funk; Christoph Busch; Shenghe Sun
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Paper Abstract

We present a high capacity reversible watermarking scheme using companding technique over integer DCT coefficients of image blocks. This scheme takes advantage of integer DCT coefficients' Laplacian-shape-like distribution, which permits low distortion between the watermarked image and the original one caused by the bit-shift operations of the companding technique in the embedding process. In our scheme, we choose AC coefficients in the integer DCT domain for the bit-shift operation, and therefore the capacity and the quality of the watermarked image can be adjusted by selecting different numbers of coefficients of different frequencies. To prevent overflows and underflows in the spatial domain caused by modification of the DCT coefficients, we design a block discrimination structure to find suitable blocks that can be used for embedding without overflow or underflow problems. We can also use this block discrimination structure to embed an overhead of location information of all blocks suitable for embedding. With this scheme, watermark bits can be embedded in the saved LSBs of coefficient blocks, and retrieved correctly during extraction, while the original image can be restored perfectly.

Paper Details

Date Published: 22 June 2004
PDF: 11 pages
Proc. SPIE 5306, Security, Steganography, and Watermarking of Multimedia Contents VI, (22 June 2004); doi: 10.1117/12.527216
Show Author Affiliations
Bian Yang, Harbin Institute of Technology (China)
Martin Schmucker, Fraunhofer-Institut fur Graphische Datenverarbeitung (Germany)
Wolfgang Funk, Fraunhofer-Institut fur Graphische Datenverarbeitung (Germany)
Christoph Busch, Fraunhofer-Institut fur Graphische Datenverarbeitung (Germany)
Shenghe Sun, Harbin Institute of Technology (China)


Published in SPIE Proceedings Vol. 5306:
Security, Steganography, and Watermarking of Multimedia Contents VI
Edward J. Delp; Ping W. Wong, Editor(s)

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