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Robust template matching for affine resistant image watermarks

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2 Author(s)
Pereira, S. ; Geneva Univ., Switzerland ; Pun, T.

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 Fourier transform. To this watermark is added a template in the Fourier transform domain to render the method robust against general linear transformations. We detail a new algorithm based on polar maps for the accurate and efficient recovery of the template in an image which has undergone a general affine transformation. 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

Published in:

Image Processing, IEEE Transactions on  (Volume:9 ,  Issue: 6 )

Date of Publication:

Jun 2000

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