基于Lab空间的图像全息数字水印算法  

Image holographic digital watermark algorithm based on Lab space

作　　者：胡广平[1] 周华强[2] 

机构地区：[1]河南工程学院,河南郑州451191 [2]中原工学院,河南郑州450007

出　　处：《电子技术应用》2014年第4期59-62,69,共5页Application of Electronic Technique

基　　金：国家自然科学基金项目(71173248)

摘　　要：为了提高水印的鲁棒性和不可见性,在颜色模型、全息和小波理论的基础上,提出一种基于Lab空间的图像全息数字水印算法。首先将水印信息进行双随机相位调制并生成水印全息图,然后将载体图像从RGB颜色空间转换到CIELab空间,对L分量进行两次小波分解,再将水印全息图嵌入两次小波分解后的低频系数上,采用全息加密技术对水印信息进行加密,实现水印的盲提取。实验结果表明,水印的不可见性较好(PSNR>20 dB),经过图像处理操作的攻击结果表明,提取水印的NC>0.9。与其他水印算法做鲁棒性的对比实验,证明了该算法有较好的鲁棒性。In order to improve the robustness and invisibility of watermark, a new image holographic watermark algorithm based on Lab space is proposed on the basic of the color model, holographic and wavelet theory. Firstly, the digital watermark image is changed into the holography image through double phase modulation. Meanwhile, the host image is converted from RGB color space to CIELab space, and the two wavelet decompositions are applied to its L component. Then the watermark is embedded into the L component＇s low-frequency of the two wavelet coefficients, encrypting the watermark information with holographic encryption tech- nology, which can achieve watermark extraction. Experimental results show that the invisibility of the watermark is better, and the robustness of the attack experiment shows that extracting watermarking NC〉0.9, and it has a better robustness comparing with other watermark algorithm.

关 键 词：全息 小波变换 水印提取 CIELab颜色空间 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]