基于多尺度小波域的数字水印算法研究

An Algorithm of Digital Watermark Based on High Scaled DWT Domain

提出了一种多尺度小波变换后嵌入数字水印图像的信息隐藏技术。首先阐述了Arnold置乱变换、图像的二维DCT变换、二维DWT变换,在此基础上,提出了一种将三者结合的图像信息隐藏算法。通过运用MATLAB工具进行实验测试和分析,表明该算法具有良好的隐藏效果和较大的信息嵌入量,改进后算法通过一些常见的图像处理操作,具有更强的鲁棒性。

An image information hiding technology based on high scaled DWT domain is proposed in this thesis. First, the algorithms based on the Arnold transform, discrete cosine transform and discrete wavelet transform are discussed. Then, an algorithm based on this technology is proposed. Finally, the algorithm test by the MATLAB is described, and the experimental results show that this algo- rithm is of fine unperceptibility and large capacity, and is fine robust under some common image processing operations after improved algorithm.