Feature-based digital image watermarking algorithm

Watermark synchronization is very crucial to design robust image watermarking scheme. In this paper, a new robust image watermarking scheme against desynchronization attacks is proposed. Firstly, the Harris-Laplace detector is utilized to extract feature points, which can survive a variety of attacks. Then, the local characteristic regions are adaptively constructed according to the characteristic scale theory. Finally, several copies of the digital watermark are embedded into the nonoverlapped local characteristic regions by quantizing the DFT mid-frequency magnitudes. By binding the watermark and image features, the resynchronization between the embedding and detection can be accomplished. Experimental results show that the proposed scheme is not only invisible but also robust against common signals processing and desynchronization attacks.EI071318-13223