一种用MATLAB实现的基于小波变换的图象水印技术

论文给出了一种在小波变换域中对静态图像加水印的方案。方案利用了小波分析的优良性质,对小波变换后的载体图像系数块,按水印图像小波变换后的系数块大小进行分块,将分得的系数子块按不同层次不同方向重复嵌入相应的水印系数块。通过与原始载体图像进行比较实现水印的提取。最后与嵌入的水印进行相关性检测来检测提取出的水印是否有效。实验结果表明这个方案取得了良好的效果。

Digital Watermarking Technique of Image in Wavelet Transform Domain Achieved by MATLAB

This paper gives a new static image watermarking scheme in wavelet transform domain.This scheme utilizes excellent properties of wavelet transform.The algorithm splits subband images into blocks by the sizes of the subband wa termarking images,then subband watermarking images are added in subband images with different directions and lev-els.The original unmarked image is required to extract the watermark.The availability of the extracted watermark is e-valuated by comparing the normalized correlation coefficient of the extracted watermark with the true one.Experimental results show that this scheme has better effects.