Image Watermarking Method Based on Fractal Transform in DWT Domain
Shuguo Yang · Journal of Qingdao University of Science and Technology · 2008
In order to improve the robustness and invisibility of image watermark,a kind of the image watermarking method based on the fractal transforms in discrete wavelet transform domain is proposed in this paper.Firstly,it applies the DWT transform to the entire image and divides the discrete wavelet coefficients into domain sub-trees and the range sub-trees based on the image spatial fractal coding,then selects the similar domain trees by the fractal affine transforms and regards them as the embedded trees,which the watermark are embedded into and extracted from by the JND model of the human visual system.Finally,it can be treated by many correlative experiments such as JPEG compress,cropping,filtering,adding noises,and rotation.The experimental results show the method is secure,robust,invisible,novel and feasible.