关键词:稳健性; 混沌; 离散小波变换; 奇异值分解; 数字水印
Robust digital image watermarking algorithm based on chaos and SVD-DWT
ZHANG Qiu-yu, LI Kai, YUAN Zhan-ting
(College of Computer & Communication, Lanzhou University of Technology, Lanzhou 730050, China)
Abstract:Many digital watermarks now available for images are sensitive to signal processing and geometric distortions, this paper proposed a robust digital image watermarking algorithm. After decomposing the whole image with 3 level of discrete wavelet transform,then applyed the singular value decomposition(SVD) to the low frequency domain, and embedded the singular values of the watermark image that was decomposed with SVD after chaotic scrambling by modifying the singular values,and embedded the watermark data to the middle frequency coefficients of wavelet domain; extracted watermarks in the intermediate frequency and low frequency region and compare them,using the extracted watermark which was better. The examination algorithm of watermark used the double watermark comparison examination. The experimental results demonstrate that this proposed watermarking algorithm is robust against some common signal processing and geometric attacks. ......