采用水印扩展与F范数的水印技术

提出一种应用于灰度图像版权保护的水印方法，为保证水印的安全性，在嵌入之前先对水印图像作置乱处理，再将水印扩展到与原始图像同样大小；然后根据小波变换的多分辨率分解特性，将水印和原始图像对应方向上的子带系数进行组合；最后在检测水印时，结合范数理论，提出用F范数实现相似度测量的新方法，实验结果表明了算法的可行性和有效性。

Watermark Technique Using Watermark Expand and F Norm

A waterm ark technique applying to copyright protection of gray- scale images is proposed.To ensure the security of waterm ark,the watermark image is scrambled before embedding and then expanded to the sam e size as the original image. The corresponding subband data of the watermark and the original im age are combined according to the characteristic of the multiresolution decom position of the wavelet transform. Finally,when detecting the presence of watermark,a new m ethod using F norm to im plem ent sim ilarity m easurem ent is presented.Experim ental results indicate the feasibility and effectiveness of the proposed algorithm.