An Algorithm of Digital Watermarking Based on DWT and SVD
Xiaohu Ma · Computer Knowledge and Technology · 2009
An algorithm of digital watermarking based on DWT and SVD is proposed to improve the robustness of digital wartermarking. Before watermarking embedded into the host image, we first modulate it, that is to generate a group of random numbers according to the size of watermarking using the seed sequence and modulate them with the watermarking. Then the modulated watermarking is embedded into the DWT domain of host image. We get the extracted watermarking by the inverse course of the embedding. Experimental results have demonstrated that the proposed approach is robust against common signal processing such as JPEG compression, noise, rotation and cropping.