Digital Watermark Encryption Algorithm Based on Arnold and DCT Transform

摘要

Digital watermarking is one of the effective methods which can protect the copyright of multimedia data. This thesis presents a digital watermarking algorithm based on Arnold and DCT Transform. First, Arnold transform is used to shuffle the watermark image, and then the algorithm makes 8×8 DCT on the carrier image. In order to improve the robustness of watermark, this thesis adopted the multi-embedded strategy. The DC coefficients in the block of the same location of each color components are embedded the same robust watermark which is transformed by Arnold. Experiments show that the improved algorithm is an effective approach which can resist the attacks and has good invisibility.