一种基于DCT和SVD的数字图像水印技术  

Watermarking algorithm for digital image based on DWT and SVD

作　　者：刘锋[1] 孙林军[1] 

机构地区：[1]浙江大学宁波理工学院信息科学与工程分院,浙江宁波315100

出　　处：《计算机应用》2005年第8期1944-1945,1947,共3页journal of Computer Applications

摘　　要：以离散余弦变换(DCT)、矩阵奇异值分解(SVD)为基础,提出一种数字水印算法,主要特点就是所嵌入的水印图像是灰度图像,增加了嵌入的信息量,能够满足数字水印系统的透明性和鲁棒性要求。实验结果表明:该算法不仅具有较好的透明性,而且对如叠加噪声、JPEG压缩、中值滤波、低通滤波、对比度增强攻击均具有很好的鲁棒性。A watermark algorithm for digital image based on DWT and SVD was proposed.It added gray images as the watermark and increased information capacity of the watermark.The algorithm can satisfy the transparence and robustness of the watermark system. The experiment based on this algorithm demonstrates that the watermark is robust to the common signal processing techniques including JEPG compressing,noise,low pass filter,median filter,contrast enhance.

关 键 词：数字水印 离散余弦变换 奇异值分解 

分 类 号：TP309.7[自动化与计算机技术—计算机系统结构]