基于DFT变换的强鲁棒性水印算法  

Research on Watermarking Algorithm of Strong Robustness Based on DFT

作　　者：张晓丹[1] 

机构地区：[1]吉首大学数学与计算机科学学院,湖南吉首416000

出　　处：《重庆师范大学学报（自然科学版）》2010年第6期64-68,共5页Journal of Chongqing Normal University:Natural Science

基　　金：吉首大学校级科研资助(No.07JDZC016)

摘　　要：数字水印技术己经成为解决数字多媒体中版权问题和内容认证的主要工具,是学术界的研究热点之一。本文在研究DFT(离散傅立叶变换)及HVS(人类视觉系统)模型在数字水印系统中的应用基础上,提出了一种基于HVS和DFT域的鲁棒性水印算法。该算法在原始图像的高频DFT系数中嵌入水印信息,将原始图像块及水印图像块分别按照方差大小进行排序,并按照方差的顺序将水印图像块嵌入到原始图像块中。最后对该算法做了大量仿真实验,用StirMark模拟了图像可能遭受的各种攻击,仿真结果表明该算法具有较好的鲁棒性和不可见性。Digital watermarking technology has been a solution in the digital multimedia content copyright issues and the principal instrument of certification,which is the focus of academic research.In this paper,firstly,DFT and HVS were introduced,which have widely used in digital watermarking system,and a robust watermarking algorithm based on HVS and DFT was proposed.The algorithm add the watermark image in the middle frequency region of DFT coefficients with fixed intensity and the watermark image was embedded into the host image block with the order of variance.Finally,a lot of stimulation experiments were programmed by Matlab.Stirmark to simulate various attacks to watermarked image.The simulation results show that the proposed algorithm has good robustness and invisibleness.

关 键 词：数字水印 水印攻击 HVS DFT 鲁棒性 不可见性 

分 类 号：TP391.4[自动化与计算机技术—计算机应用技术]