Journal of Integrated Design & Process Science
Adaptive quantization of wavelet packet coefficients for image watermarking
MUSP'08 Proceedings of the 8th WSEAS International Conference on Multimedia systems and signal processing
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We present a method for digital image watermarking based on the modification of certain subsets of the wavelet packet decomposition. These subsets are determined from both a secret key and an image dependent procedure that chooses a best basis from an energy criterion. Imposing a parity constraint at each level of the decomposition sets the mark. We elaborate on the choice of some of the parameters of the model, showing how they can be tuned to obtain good resistance to attacks. Examples are displayed to assess the validity of our approach.