一种基于双随机相位加密的全息水印算法

A holographic watermarking algorithm based on double random phase encryption

提出一种基于双随机相位加密的全息水印算法。首先应用双随机相位调制对原始水印进行加密产生全息水印图;然后将原始图像进行一级离散小波变换(DWT)获得低频子图,对低频子图进行分块的离散傅里叶变换(DFT)得到幅度谱;其次分别对幅度谱和全息水印图进行奇异值分解(SVD);最后将全息水印图的奇异值加权嵌入到幅度谱的奇异值。实验结果表明,该算法对旋转、平移、缩放等几何攻击具有较强的鲁棒性。

A holographic watermarking algorithm based on double random phase encryption is proposed. The double random phase modulation is applied to encrypt original watermarks and generate holographic watermark images. Then the one level discrete wavelet transform（DWT）is performed for the original image to obtain the low-frequency subgraph. The partitioned discrete Fourier transform（DFT）is performed for the low-frequency subgraph to obtain the amplitude spectrum. The singular value decomposition（SVD）is performed for the amplitude spectrum and holographic watermark image. The singular values of the holographic watermark image are weighted and embedded into those of the amplitude spectrum. The experimental results show that the algorithm has strong robustness for geometric attacks such as rotation,translation and zooming.