一种基于 Contourlet 变换的彩色图像全息水印算法

提出了一种结合了全息水印加密技术和 Contourlet 变换技术的彩色图像水印算法。 算法首先将 RGB 模式的水印载体图像转换至 YCrCb 颜色空间,选取亮度分量作为水印载体通道,对其进行多层 Contourlet 分解,得到细节子带图像;而后对二值水印图像进行傅里叶全息加密,将加密后的图像嵌入至载体图像的 Contourlet变换系数中。 仿真实验结果表明,该水印算法具有良好的不可见性,对于常见的几何变换及多种攻击具有良好的鲁棒性。

Novel Color Image Hologram Watermarking Algorithm Based on Contourlet Transform

A novel color image watermarking algorithm based on contourlet transformation and computer generated hologram was put forward. Firstly, the watermarked host image in RGB mode was converted to YCrCb color space, and contourlet transform was performed on the luminance Y component to get detailed sub band images. The watermarked image was encrypted with Fourier hologram technology. Finally, the encrypted digital watermark was embedded into decomposed detail sub bands of discrete contourlet transform. Simulation results showed that the proposed algorithm has good invisibility and is robust against common geometric transformation and multiple attacks.