A Novel Color Watermarking Algorithm Based on Block SVD

In this paper, an improved watermarking algorithm for color image based on block singular value decomposition is proposed. SVD transformation preserves both one-way and non-symmetric properties, usually not obtainable in DCT and DFT transformations. In the proposed scheme, both of the U and D components are purposed to embeded the watermark. Experiments and attacks test show that the algorithm has good robustness. Furthermore, the extracted watermark can still be easily identified after tampering.