An Effective Approach of Digital Image Watermarking for Copyright Protection

The main goal of developing an image watermarking technique is to satisfy both imperceptibility and robustness requirements. To achieve this goal, a hybrid DWT (discrete wavelet transform) SVD (singular value decomposition) and a logistic chaotic map based watermarking technique is proposed. In this approach, the watermark is not embedded directly on the wavelet coefficients but rather than the elements of singular values of the cover image’s DWT sub-bands and watermark before embedding process encrypted by a logistic chaotic map. Experimental results are provided to evidence that the proposed approach is able to withstand a variety of geometric and image-processing attacks. It provides solution for false position problem and substitution watermarking rounding error problem in the frequency domain.