基于混沌序列与LWT的彩色图像数字水印新算法

A new color image digital watermarking algorithm based on chaotic sequences and LWT

研究了混沌序列、提升小波在彩色图像数字水印中的应用,提出一种新的基于混沌系统和提升小波(LWT)的彩色图像水印算法。为提高算法的安全性,同时采用了两种混沌序列和Arnold变换置乱水印;为提高算法的效率,使用了提升小波变换来对载体图像进行小波分解;为加强算法的鲁棒性和不可见性,根据人类视觉系统(HVS)特性,在中、低频使用不同的算法嵌入水印,且提出了均值块的使用。仿真实验证明,该算法具有很好的安全性和鲁棒性、较好的不可见性和较高的效率。

A new color digital image watermarking algorithm is given, based on chaotic system and lifting wavelet transformation （LWT）. In order to improve the security of the algorithm, two kinds of chaotic sequence and Arnold transform are adopted to scramble the watermark image at the same time. To improve the efficiency of the algorithm, lifting wavelet transform is applied to the carrier image wavelet decomposition. In order to enhance the robustness and invisibility, according to the characteristics of human visual system （ HVS）, watermark is embedded in the low frequency and middle frequency by different algorithms, and the use of the block mean proposed. Simulation results show that, the algorithm has high robustness, security and efficiency, and the effect of concealing is very good.