基于超混沌和小波变换的鲁棒性数字水印算法

Robust Digital Watermarking Algorithm Based on Hyperchaos and Wavelet Transform

提出一种基于二维超混沌序列和离散小波变换(DW T)相结合的鲁棒性数字水印算法.该算法利用形式简单的二维离散超混沌系统产生的超混沌序列生成密码对水印图像加密,同时根据人类视觉系统的特性,对宿主图像在Y IQ色彩空间中的Y分量进行多级离散小波变换后,将加密后的水印图像嵌入到宿主图像Y分量的DW T中频子带中.实验结果表明算法同时具有良好的鲁棒性和不可见性.

An algorithm of digital watermarking based on two-dimentional hyperchaos sequence and discrete wavelet transform is presented, which generates cipher sequence to encrypt the watermark using hyperchaos sequence generated by simple two-dimentional hyperchaos system. The characteristics of human visual system is used to embed the watermarks which is encrypted into mid-frequency subbands coefficients of Y branch of host image after Y branch of host image is transformed by the multilevel structures wavelet transform in the YIQ pattern space. The experimental results show the robustness and invisibility of the proposed algorithm.