Recovery of Watermarks from Distorted Images
IH '99 Proceedings of the Third International Workshop on Information Hiding
Evaluation of Copyright Marking Systems
ICMCS '99 Proceedings of the IEEE International Conference on Multimedia Computing and Systems - Volume 2
Rotation, scale, and translation resilient watermarking for images
IEEE Transactions on Image Processing
Geometrically invariant watermarking using feature points
IEEE Transactions on Image Processing
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A new method improving watermark robustness against both global and local geometrical distortions is presented in this article. The proposed approach is based on a self-reference concept and exploits special autocorrelation features of a spatial template. The template allows identifying both the transformation parameters and translation coordinates. Distortions are estimated and reversed on a level as global as possible to maximize watermark recovery effectiveness and minimize a time needed for that purpose. Experimental results showed that an inserted watermark could be successfully read even after Stirmark attack.