一种基于离散傅立叶变换域相位和幅度的数字水印算法

Digital watermarking algorithm based on phase and amplitude of DFT domain

将水印分别嵌入离散傅立叶变换(DFT)域的相位谱、幅度谱进行仿真实验,比较了两种算法在相同的嵌入失真下的鲁棒性,提出了相位幅度相结合的DFT域水印算法,算法在提取水印时不需要原始图像。实验证明,该相幅水印算法简单易行,具有很好的不觉察性,而且对图像的尺度变换、旋转攻击、噪声干扰、JPEG压缩以及滤波等都具有很强的鲁棒性。

A meaningful watermark was embedded into phase and amplitude components of block DFT of image seperately, then their robustnesses were compared under the same distortion. Combined with phase and amplitude components, a novel DFT domain watermarking algorithm was proposed. The watermark could be detected without the primitive image. Experiment 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.