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Title

Template based recovery of Fourier-based watermarks using log-polar and log-log maps

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Published in IEEE Multimedia Systems 99, International Conference on Multimedia Computing and Systems. Florence (Italy) - Jun 7-11 - . 1999, p. 870-874
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.
Keywords Watermarking
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Research group Computer Vision and Multimedia Laboratory
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PEREIRA, Shelby et al. Template based recovery of Fourier-based watermarks using log-polar and log-log maps. In: IEEE Multimedia Systems 99, International Conference on Multimedia Computing and Systems. Florence (Italy). [s.l.] : [s.n.], 1999. p. 870-874. https://archive-ouverte.unige.ch/unige:47866

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Deposited on : 2015-03-06

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