一种新的小波域自适应可见水印算法

本文提出了一种新的小波域自适应可见水印算法.依据载体图像和水印图像的特征,结合人类视觉系统特性,算法逐点确定水印嵌入时的加权系数,使水印信号的嵌入根据载体和水印图像特征的变化而变化.仿真实验结果表明,水印图像半透明地呈现在所覆盖的载体图像区域,算法简便快捷.

A new adaptive visible watermarking algorithm based on DWT

The four dimensional hyper chaotic system is built by adding an additional state to the three order coupled dynamos system. Some of its basic dynamical properties are studied briefly, such as the feature of equilibrium, the hyper chaotic attractor, Lyapunov exponent and fractal dimension, and an analog electronic circuit is designed to verify the new system. The experiment results show that the system is a new hyper chaotic system. Moreover, it is different from three order coupled dynamos system; Based on Lyapunov theory, a nonlinear controller is designed to synchronize two identical systems and two different chaotic A new adaptive visible watermarking algorithm based on DWT proposed in this paper. With the characters of the human visual system,the factors are defermined by both host and watermark features adaptively. Experiments show that the watermarked image meets the requirements of visible watermarks quite well.