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ICMCS
1999
IEEE

Template Based Recovery of Fourier-Based Watermarks Using Log-Polar and Log-Log Maps

10 years 1 months ago
Template Based Recovery of Fourier-Based Watermarks Using Log-Polar and Log-Log Maps
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 logpolar or log-log maps for the accurate and ecient 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.
Shelby Pereira, Joseph Ó Ruanaidh, Fr&eacut
Added 03 Aug 2010
Updated 03 Aug 2010
Type Conference
Year 1999
Where ICMCS
Authors Shelby Pereira, Joseph Ó Ruanaidh, Frédéric Deguillaume, Gabriela Csurka, Thierry Pun
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