A Robust Full-Band Image Watermarking Scheme

Distributed discrete wavelet transformation (DDWT) method was proposed in 2006 for copyright protection. In this paper, we propose a watermarking scheme for digital image based on the DDWT method with some modifications to improve its robustness. Our scheme transforms original image data from the spatial domain into the frequency domain by using the DDWT technique, and then embeds watermark information in the four sub-bands in the frequency domain. In this way, we not only keep intact the salient feature of the DDWT method, which distributes hidden watermark information in the spatial coefficients and is robust against the cropping attack, but also greatly improve its performance so that the new scheme is robust against geometric attacks such as rotation or scaling and non-geometric attacks such as Gaussian noise, sharpening, and contrast adjustment, too. Our experiment results show that the stego-image is superior and the watermark is robust against a variety of geometric and non-geometric attacks mentioned above