A hybrid RDWT-DCT and SVD based digital image watermarking scheme using Arnold transform

In the present scenario Digital image watermarking is a powerful method for solving the problems of tamper detection, rightful ownership, copyright protection and content authentication. In this paper a secure hybrid digital image watermarking scheme based on Redundant Discrete wavelet transform (RDWT), Discrete Cosine Transform (DCT) and Singular value decomposition (SVD) in zigzag order with Arnold transform is presented. Watermark image is scrambled by Arnold transform to boost up its secrecy and robustness. In presented scheme, a gray scale cover image is rearranged through zigzag sequence and then RDWT is implemented on this reordered cover image. After that DCT, SVD is implemented on mid and high frequency sub-bands (LH, LH, and HH) of cover image and modified the singular values of these sub-bands by embedding the scrambled gray scale watermark image. This presented scheme is more imperceptible and an enormous capacity due to the properties of RDWT and SVD. The benefit of the presented scheme is more robust and secured against various image processing attacks. Analysis and experimental outcomes show that the presented scheme is rich in terms of imperceptibility, robustness, capacity and security from earlier proposed schemes.