一种自适应的DFT域数字水印算法

论文提出一种用于数字图像版权保护的DFT域水印算法。该算法对图像分块进行傅立叶变换,利用图像的统计特性和人眼对图像变化的敏感性、自适应地选取相应的图像块及图像块中幅度谱系数的重要性来嵌入水印。该算法在提取水印时不需要原始图像。实验证明,此算法简单易行,具有很好的不觉察性,而且对JPEG压缩、图像的尺度变换、旋转攻击、中值滤波以及噪声干扰等都具有很强的鲁棒性。

An Adaptive DFT Domain Digital Watermarking Scheme

A discrete Fourier transform(DFT) based watermarking algorithm is proposed for copyright protection of digital images.Select related image block based on statistic classification and human visual sensitivity,Fourier transform to these blocks,then embed a meaningful watermark into the amplitude components of important block DFT coefficients of image.Watermark can be detected without cover image.Experimental results show that the algorithm is easy to realize and the watermarking is invisible,moreover,the algorithm is robust to JPEG compression,resizing,rotation,median filtering and noise perturbation.