摘要
数字水印作为数字媒体版权保护的有效办法,近年来越来越为人们所重视。该文提出了一种基于小波变换在静止图像中嵌入数字水印的新算法;算法采用二值图像作为水印,首先利用二维离散小波变换对原始载体图像进行多级分解,然后置乱二值水印图象,将二值水印数据叠加到图象的低频小波系数上实现水印的嵌入,最后进行逆向小波变换生成嵌入水印后的图象。实验结果表明,该算法对JPEG有损压缩、滤波和噪声等水印攻击显示出较强的鲁棒性,取得了隐蔽性和鲁棒性的良好折衷。
Being an effective way of protecting copyright of digital media ,watermark is receiving more and more attention. In this paper, a method of digital watermark for still image based on the wavelet transform is proposed. In this method, the watermark is a bilevel image, first the raw image in multiresolution is decomposed using DWT,then the watermark image is permutated and added into the low-frequency wavelet coefficients of multiresolution representation of the original image, finally the image with watermark is reconstructed using IDWT.Experimental results show that the proposed method is robust against JPEG compression, image processing and attack such as filtering and noise,and receive a good tradeoff between concealment and robustness.
出处
《计算机仿真》
CSCD
2004年第7期57-59,51,共4页
Computer Simulation
