一种基于小波变换的数字图像水印新算法

A new way of digital watermark based on wavelet transformation

提出了一种基于小波变换的鲁棒性水印算法.该算法首先对水印信息进行Arnold置乱以降低空间相关性,之后做一级小波变换,然后把原始图像进行二级小波变换.并将水印信息分散嵌入到原始图像的低中频子带,最后经二级小波反变换得到嵌入水印后的图像.实验结果表明,该算法具有较强的鲁棒性.

A robust digital image watermarking algorithm based on DWT is proposed in this paper.At first,the watermark is scrambled to decrease the spatial correlation by Arnold Transform,then the watermark is one-level wavelet transformed;then the original image is two-level wavelet transformed and distributed embed the watermark into the low and intermediate frequency sub-band of the original image.Finally,the watermarked image is achieved through reverse wavelet transform.Experiment results show that the proposed algorithm is robust against common image processing.