一种基于Contourlet变换的彩色图像全息水印算法  

Novel Color Image Hologram Watermarking Algorithm Based on Contourlet Transform

作　　者：孙刘杰[1] 徐卓[1] 

机构地区：[1]上海理工大学,上海200093

出　　处：《包装工程》2013年第9期10-13,共4页Packaging Engineering

摘　　要：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。A novel color image watermarking algorithm based on contourlet transformation and computer generated hol- ogram was put forward. Firstly, the watermarked host image in RGB mode was converted to YCrCb color space, and eontourlet 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.

关 键 词：数字水印 CONTOURLET变换 全息加密 彩色图像 

分 类 号：TS801.3[轻工技术与工程] TS807