Robust Digital Image Watermarking Scheme Based on RDWT-DCT-SVD

Digital image watermarking scheme is promising and efficient method for protecting DRM (Digital Right Management). So a new approach based on RDWT-DCT-SVD is developed in this paper. First of all Redundant Discrete Wavelet Transform (RDWT) is applied on the cover image then 2-D Discrete Cosine Transform (DCT) is applied on the LL (low-low) sub-band, further Singular Value Decomposition (SVD) is performed on the DCT transformed image. Finally singular values (SV's) of this DCT transformed image are inserted into the SV's of the watermark. LL (low-low) frequency sub-band is to attain good robustness. Analysis of the experimental results shows that proposed watermarking algorithm is more robust than the existing watermarking scheme against attacks like salt & pepper noise, Wiener filtering, geometric distortions.