A New Digital Watermarking Scheme for Image Copyright Protection using Wavelet Packets

In this paper we propose a robust blind private watermarking algorithm for image copyright protection. The algorithm is based on wavelet packets. Our basic idea is to decompose the original image into a series of details at different scales by using wavelet packets; a binary image used as a watermark is then embedded into the different levels of details. The embedding process includes: usage of an unique (secret) binary identification key to select the wavelet decomposition scheme, wavelet packet decomposition, selection of the wavelet coefficient groups to be used for hiding the watermark, insertion of the watermark in the corresponding group of coefficients by modifying the mean value of the group and inverse wavelet transform. Experiments showed that our algorithm does only minimal degradation to the original image and can improve the robustness of watermarking against different attacks