Robust Digital Watermarking using Contourlet Transform and DWT and SVD Techniques

Abstract

Watermarking is a data hiding technique and is highly reliable for copyright protection in case of digital data transmission. Contourlet Transform is used for watermarking purposes as in order to extract the directionalities and geometric shapes. It is highly efficient in terms of non-linear approximations thereby quite reliable for image compression. DWT and SVD techniques though provide a high frequency resolution but lack in the fulfilment of directions and geometric shapes, which is thus provided by Contourlet Transform. In my thesis, i have proposed the differences in the DWT and SVD techniques than Contourlet Transform and then combined their benefits in order to yield a transform with a better PSNR and more directionalities and geometric shapes. The technique for watermarking proposed in the thesis provides better horizontal and vertical directions and also provides high robustness. Therefore, the proposed scheme of watermarking is tested and proven to be highly reliable and robust.