基于HVS和DWT数字图像水印算法的研究

文章采用了一种基于离散小波（DWT）多分辨率分解的数字水印技术，研究了水印算法，将图像进行三级小波分解，产生三个高频带系列子图和一个低频带子图。由于人眼对高频信息的敏感度低于对低频信息的敏感度，因此，采用了把水印嵌入到小波图像中的高频系数中。通过MATLAB仿真实验实现了将水印信息嵌入到原始图像中的技术，再对含水印图像加椒盐噪声、高斯低通滤波和缩小50％再放大200％进行攻击以及J-PEG压缩实验仿真，结果表明所提算法具有很好的视觉效果和鲁棒性。

Study on Algorithm of Digital Image Watermarking Based on DWT

This article use the discrete wavelet （DWT） multi-resolution decomposition of digital watermarking technology, study watermarking algorithm, Three-level wavelet decomposition of the image, generate three series of high frequency band sub-graph and a low-frequency band sub-graph. As the human eyes are sensitivity to high frequency information lower than low-frequency information, therefore, the watermark is embedded to high frequency coefficient C of the wavelet images. Achieved the technology that embed watermark in original image by MATLAB simulation, and do the experiment of salt-pepper noise added, Gauss low-pass filter and amplifying 200% after narrowing 50%. Experiment results show the above algorithm has great vision effect and robustness.