基于图像版权保护的扩频水印算法仿真研究  

Simulation Research of Spread-Spectrum Watermarking Based on Image's Copyright Protection

作　　者：徐光宪[1] 张鑫[1] 付晓[1] 

机构地区：[1]辽宁工程技术大学电子与信息工程学院,辽宁葫芦岛125105

出　　处：《计算机仿真》2012年第10期298-301,305,共5页Computer Simulation

基　　金：辽宁省重点实验室资助项目(2009S051)

摘　　要：研究数字图像的版权保护问题,由于扩频水印在受到旋转攻击时,提取出的水印图像鲁棒性较差,无法实现图像的版权保护。为提高扩频水印的抗旋转攻击能力,提出一项全新的扩频水印算法。将Arnold与Radon变换理论引入到扩频水印理论中,首先将载体图像进行Radon变换,以及对Radon变换域中的值进行二维DCT变换,为水印提供抗旋转攻击的载体环境,并利用Arnold变换原理,对水印图像进行置乱,使水印的保密性得到增强。最后可将水印序列嵌入到载体之中,完成水印的嵌入,进行仿真,得到具有抗旋转攻击能力的扩频水印,证明了算法在具备良好保密性的同时,能够抵抗不同角度的图像旋转攻击,克服了扩频水印的缺点,使数字图像的版权的得到了有效的保护。Research on copyright protection of digital images.For current situation when the spread spectrum watermarking was attacked by rotation,the robustness of extracted watermarking image will become weak,the copyright of the image cannot be protected.This paper proposed a new algorithm to improve the ability of resisting to rotation attack.Arnold and Radon transformation methods were brought to the spread spectrum watermarking.First,Radon transform of the carrier image was carried out and the value in the Radon transform domain was transformed with 2d DCT,which can provide a carrier environment resisting to rotation attack.Then,the watermarking image were scrambled based on Arnold transformation to enhance confidentiality of watermarking.In the end,the watermarking sequence was embed into the carrier image to complete the embedding process,and we can get a watermarking with an ability of resisting to rotation.The simulation result indicates that the algorithm can resist the rotation attacks with different angels,overcome the spread spectrum watermarking fault,and has a good confidentiality.

关 键 词：扩频水印 版权保护 离散余弦变换 抗旋转 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]