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Proceedings Paper

Coping with local geometric attacks by means of optic-flow-based resynchronization for robust watermarking
Author(s): R. Caldelli; A. De Rosa; R. Becarelli; Mauro Barni
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Paper Abstract

In the last years digital watermarking has been widely indicated as a possible efficient tool to deal with multimedia copyright protection. Particularly, in the field of image watermarking, a large number of techniques has been developed aiming at hiding information within the data. After an initial phase in which the main problem was to succeed in inserting a private code which was unperceivable, successively watermarking community tried to design watermarks which presented a high level of robustness that meant the ability to be revealed also when the image had undergone different manipulations (e.g. compression, D/A-A/D conversion, filtering). Although good results have been obtained in this field, resilience against geometric manipulations, (e.g. rotation, scaling, changes of aspect ratio) is still a research issue; furthermore robustness against Stirmark random-displacements attack in which small local geometric modifications are carried out, is still a crucial point for the majority of the so-called robust algorithms. In this paper a new approach, based on the estimation through an optic flow technique of the displacement field, correspondent to a specific geometric transformation, is proposed. This methodology can be adopted as a re-synchronization tool, to enhance robustness of digital image watermarking techniques.

Paper Details

Date Published: 21 March 2005
PDF: 11 pages
Proc. SPIE 5681, Security, Steganography, and Watermarking of Multimedia Contents VII, (21 March 2005); doi: 10.1117/12.589106
Show Author Affiliations
R. Caldelli, Univ. degli Studi di Firenze (Italy)
A. De Rosa, Univ. degli Studi di Firenze (Italy)
R. Becarelli, Univ. degli Studi di Firenze (Italy)
Mauro Barni, Univ. degli Studi di Siena (Italy)

Published in SPIE Proceedings Vol. 5681:
Security, Steganography, and Watermarking of Multimedia Contents VII
Edward J. Delp; Ping W. Wong, Editor(s)

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