Template Based Recovery of Fourier-Based Watermarks Using Log-polar and Log-log Maps

Authors:
Shelby Pereira;Joseph J. K. O. Ruanaidh;Frederic Deguillaume;Gabriela Csurka;Thierry Pun;Joseph J. K. O. Ruanaidh
Affiliations:
University of Geneva;University of Geneva;University of Geneva;University of Geneva;University of Geneva;Siemens Corporate Research
Venue:
ICMCS '99 Proceedings of the IEEE International Conference on Multimedia Computing and Systems - Volume 2
Year:
1999

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Abstract

Digital watermarks have been proposed as a method for discouraging illicit copying and distribution of copyrighted material. This paper describes a method for the secure and robust copyright protection of digital images. We present an approach for embedding a digital watermark into an image using the fast Fourier transform. To this watermark is added a template in the Fourier transform domain to render the method robust against rotations and scaling, or aspect ratio changes. We detail a new algorithm based on the log-polar or log-log maps for the accurate and efficient recovery of the template in a rotated and scaled image. We also present results which demonstrate the robustness of the method against some common image processing operations such as compression, rotation, scaling and aspect ratio changes.