基于小波变换的彩色图像数字水印算法

摘要

As an effective technique for multimedia copyright protection, digital watermark technology has drawn more and more attention. Digital watermark algorithm by embedding a color digital watermark into an original color image is proposed. According to the characters of human visual systems, based on the weighting coefficients corresponding to different frequency bands, the watermark with corresponding strength is embedded in the image to which two level wavelet transform is carried out. Then the digital watermark is drawn out with the help of the original image and the watermark image. According to the experiment, this watermark algorithm has good robustness for some common image processing operations and low visual distortion. At the same time, the algorithm also has a good invisibility and stability.%研究图形数字水印优化问题,作为一门有效的多媒体版权保护技术受到越来越多的关注.针对版权保护抵抗噪声攻击难点问题,提出了一种将彩色数字水印嵌入到原始彩色数字图像中的算法,它利用人眼视觉系统特性,将经过两级小波变换后的原始图像,根据不同频段对应的加权系数嵌入相应强度的水印,采用含水印图像和原始图像提取出嵌入的水印进行试验,实验结果表明,算法在对常见的图像处理操作攻击具有较好的鲁棒性,且主观视觉失真较小.同时算法还具有较好的不可见性和稳定性,可为设计提供参考.