Oblivious cocktail watermarking by sparse code shrinkage: a regional- and global-based scheme

Watermarking with oblivious detection and high robustness capabilities together is still a challenging problem up to now. The existing methods are either robust or oblivious but it is difficult to achieve both goals simultaneously. In this paper, oblivious detection is formulated as a blind source separation problem by regarding the hidden watermarks as noise. To keep high robustness, our non-oblivious cocktail watermarking scheme, which is very robust, is adopted to combine with the oblivious detection mechanism. The proposed oblivious cocktail watermarking can be applied to global watermarking and regional watermarking. Experimental results have demonstrated the powerfulness of our method