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Proceedings Paper

Fragile and robust watermarking by histogram specification
Author(s): Dinu Coltuc; Philippe Bolon; Jean-Marc Chassery
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Paper Abstract

This paper presents new results on regional image watermarking by exact histogram specification. Image is split in regions and for each region a watermark is specified. Watermarks are selected such as image original histogram is preserved. Main improvement of proposed regional scheme consists in the marking of the entire image (all the regions) with complementary watermarks. This procedure considerably increases watermarking robustness. The region selection strategy is discussed so that direct identification of regions and bordering effects are eliminated. Robustness/fragility of the proposed scheme depends on the specified histograms. In a general setting, exact histogram specification allows only certain graylevel values for the pixels of each region. Fragile watermarking is obtained when sentinel pixels' region is allowed to take only certain discrete values. Thus, using sparse histograms, one achieves not only image authentication, but also, in case of any attack or malicious editing, the detection of the area where image has been altered. On the contrary, robust watermarking against many attacks is obtained when pixels of each region are allowed to take values on compact intervals of graylevels.

Paper Details

Date Published: 29 April 2002
PDF: 10 pages
Proc. SPIE 4675, Security and Watermarking of Multimedia Contents IV, (29 April 2002); doi: 10.1117/12.465331
Show Author Affiliations
Dinu Coltuc, Valahia Univ. of Targoviste and Institut National Polytechnique de Grenoble (France)
Philippe Bolon, Univ. of Savoie (France)
Jean-Marc Chassery, Institut National Polytechnique de Grenoble (France)


Published in SPIE Proceedings Vol. 4675:
Security and Watermarking of Multimedia Contents IV
Edward J. Delp; Ping Wah Wong, Editor(s)

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