基于DCT和DWT的彩色图像双功能水印算法  

Dual watermarking algorithm based on DCT and DWT for color image

作　　者：吴楠[1] 吕建平[1] 

机构地区：[1]西安邮电大学计算机学院,陕西西安710121

出　　处：《电子设计工程》2015年第23期161-164,共4页Electronic Design Engineering

摘　　要：针对现今多数数字水印算法仅针对灰度图像并且功能单一的问题,提出一种彩色图像双功能水印算法,不仅增加了水印的信息量同时还可以实现版权保护和内容认证的双重功能。该算法是基于RGB色彩空间,首先提取原始彩色图像的R、G、B 3个彩色分量,然后将版权水印嵌入蓝色分量的低频系数中,认证水印嵌入绿色分量的中频系数中。实验结果表明,版权水印具有较好的鲁棒性和不可见性,认证水印可实现盲提取。Contrapose-the-existing-problem in the majority of digital watermarking algorithms nowadays only aiming at gray image and single function,a dual watermarking algorithm for color image was proposed.Not only increase the watermarking in- formation at the same time also can achieve the dual function of copyright protection and content authentication.The algorithm is based on RGB color space,first extracting three color components of R,G,B from the original color image ,and then embed- ding copyright watermark into the low frequency coefficient of blue component and authentication watermark into the interme- diate frequency coefficient of green component.The experimental results show that the copyright watermark has good robustness and invisibility, authentication watermark can realize blind extraction.

关 键 词：DCT DWT 彩色图像 版权水印 认证水印 

分 类 号：TN918.4[电子电信—通信与信息系统]