A Hybrid Watermarking Scheme by Redundant Wavelet Transform and Bidiagonal Singular Value Decomposition

Recent advances in the Internet have simplified data manipulation on the web, so protection of copyrighted contents is a tough task. Digital image watermarking is a solution to this problem, which embed the watermark with intellectual property rights into images. Developing the methods that satisfy both imperceptibility and robustness is the main challenge for researchers. In this paper a novel blind watermarking method is presented based on redundant wavelet transform (RDWT) and bidiagonal singular value decomposition (BSVD). The original image first is transformed by RDWT, then the gray scale watermark image is embedded in the bidiagonal singular values of the low-frequency subband of the host image. Due to the extraction phase, which is performed without original image, this scheme is blind. Experimental results on benchmark images demonstrate that our proposed scheme is able to withstand a variety of attacks, in addition to its good invisibility.