基于小波域的扩频水印算法

为了达到对数字产品版权保护的目的,采用一种基于小波域的扩频水印算法。该算法采用二值图像作为水印,首先将原始载体图像进行离散小波变换一级分解,然后用2个不相关的伪随机序列分别代表水印信息中的0和1,嵌入到小波分解后的LH,HL和HH三个子图上,最后进行逆向小波变换生成嵌入水印后的图像。通过在开发工具Matlab下的模拟实验,得出了该算法对滤波、噪声和剪切等攻击,显示出较强的鲁棒性,取得了隐蔽性与鲁棒性的良好折衷。

Spread Spectrum Watermark Algorithm Based on Wavelet Domain

in order to achieve the copyright protection of digital products,a spread spectrum watermarking algorithm based on wavelet domain is employed.The algorithm adopts binary image as watermark.The DWT first-order decomposition of the original carrier images are conducted.Two uncorrelated pseudo random sequences are used to respectively represent 0 and 1 in the watermark information,and then to embed 0 and 1 into three decomposed subgraphs of LH,HL and HH.The reverse wavelet transform is performed to generate im...