SoRS: An effective SVD-DWT watermarking algorithm with SVD on the revised singular value

The proposed SoRS algorithm is based on the SoW scheme present in [1]. In SoW algorithm, the watermark is split into four shares, 2-level DWT is applied and SVD is performed on the HL/LH subbands. While in SoRS, all the subbands of 2-level DWT performed on the low subband are selected for embedding watermark. Furthermore, SVD is performed on the singular value revised by the watermark and the carrier image. The experimental results show that SoRS has both the significant improvement in perceptibility and the robustness under various types of image processing attacks. Even though this algorithm is weak against scaling attacks, it extracts watermarks of higher quality than other algorithms under many attacks such as JPEG compression, filtering, histogram equalization, rotation, cropping and noise.