DCT image watermarking technique based on the mix of time-domain

This paper proposes a new technique of image digital watermarking-the DCT image watermarking technique based on the mix of time-domain. This technique has combined a pre-transformation in time-domain with DCT, and thus it can disperse the noise and make the recovered watermarking image clearer. This paper conducts several simulation experiments to find suitable orthogonal matrix by Matlab. This paper also carries out attack tests and simulation experiments for the mixed DCT digital watermarking, and compares the results with those of the conventional DCT digital watermarking. The results show that the DCT digital watermarking based on the mix of time-domain is more robust and more invisible than the conventional DCT digital watermarking.