Robust Digital Watermarking Based on the Log-Polar Mapping
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The geometrical attacks are still an open problem for many digital watermarking algorithms used in present time. Most of geometrical attacks can be described by using affine transforms. This article deals with digital watermarking in images robust against the affine transformations. The new approach to improve robustness against geometrical attacks is presented. The discrete Fourier transform and log-polar mapping is used for watermark embedding and for watermark detection. Some attacks against the embedded watermarks are performed and the results are given.
KeywordsDigital watermarking, geometrical attacks, discrete Fourier transform, log-polar mapping, hash function
Document typePeer reviewed
Document versionFinal PDF
SourceRadioengineering. 2007, vol. 16, č. 4, s. 76-81. ISSN 1210-2512
- 2007/4