A Blind Image Watermarking Algorithm Based on Lifting Scheme Wavelet and DCT

Digital watermark technique is one of the most active research topics in the safety field of multimedia information. On the basis of research on invisibility of HVS for the image, this paper proposes a blind image watermarking algorithm based on lifting scheme wavelet and DCT. Its main ideas are as follows: (1) analyzing the luminance component of the host image by lifting scheme wavelet; (2) dividing the lower frequency subband into blocks and transforming every block by DCT into a coefficient block; (3) embedding the watermarking information of binary image into the middle frequency region of the coefficient block together with the invisibility of HVS. Because of using the invisibility of HVS, the algorithm makes the embedded watermarking energy in the coefficient block adaptable. The algorithm possesses very strong robustness for some common image processing operations. Simulation results show the feasibility of the method.