Image watermarking through joint spatial segmentation and wavelet packet frequency division

In this paper we consider a method for image watermarking based on wavelet packet frequency division and spatial segmentation. We present a new direct structured decomposition, with both spatial segmentation and orthogonal frequency branching from each node. Whereas traditional wavelet packet decomposition adapts to a global frequency distribution, this technique finds the best joint spatial segmentation and local frequency basis. To achieve better performance in case of robustness and visual quality, we take advantage of singular value decomposition characteristic. Experimental evaluations demonstrate that the proposed scheme is robust against variety of attacks.