Robust DWT-SVD Image Watermarking With Hybrid Technique for Embedding Data in All Frequencies

DWT-SVD digital watermarking scheme which is based on the combination of Discrete Wavelet Transform and Singular Value Decomposition is a recent digital watermarking technique and has become popular due to its robustness against various attacks. In this paper, we present an image watermarking scheme which combines previous DWT-SVD based methods which guarantees robustness without increasing algorithm complexity. In order to tackle the common drawback of existing DWT-SVD watermarking scheme, we also introduce a "reverse embedding" technique and use scaled singular values. Because our proposed method combines the strength of previous methods, it is able to provide a comprehensive and much improved robustness against various kinds of attack and this is shown in the simulations. The reverse embedding technique also avoids negative film effect which is common in existing DWT-SVD image watermarking scheme.