Proceedings chapter
Open access

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

Presented at Florence (Italy), Jun 7-11
Publication date1999

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.

  • Watermarking
Citation (ISO format)
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.
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Proceedings chapter (Published version)
  • PID : unige:47866

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