一种小波域的自适应数字盲水印算法研究  

An Adaptive Blind Digital Watermarking Algorithm Based on Wavelet Domain

作　　者：邹强[1] 

机构地区：[1]中国民航飞行学院航空工程学院,四川广汉618307

出　　处：《计算机仿真》2011年第6期284-287,396,共5页Computer Simulation

摘　　要：研究数字图像版权保护问题,针对传统水印算法不能很好地解决水印隐蔽性与鲁棒性之间矛盾,提出一种基于小波域的自适应数字盲水印算法。首先采用人的视觉系统亮度掩蔽和图像纹理特性产生伪随机二值序列作为水印,增强水印的鲁棒性。然后选择两条小波子带,根据相邻特征平均值和奇偶判决法在两个子带上各自嵌入一半水印,并自适应地调整小波系数的量化间隔,提高了嵌入水印图像的隐蔽性;水印检测过程不需要原始图像的参与,实现盲提取。实验结果表明,算法的自适应性强,不仅具有较好的很好隐蔽性,而且对各种攻击有较强的鲁棒性,很好解决了水印隐蔽性与鲁棒性之间矛盾,可为水印设计提供参考。Study on digital image copyright protection.Traditional watermarking algorithm cannot solve the contradiction between watermarking robustness and concealment.An adaptive watermarking algorithm is proposed based on wavelet domain.Firstly,the algorithm adopts the visual system image texture characteristics and brightness masking pseudo random binary sequences generated as the watermark,and enhancse the watermarking robustness.Then two wavelet sub-bands are selected,and in each one,half watermark is embedded according to the average of adjacent features and parity judgment method.Then the ouantization interval of wavelet coefficients is adaptively adjusted to improve the watermark image of concealment.Watermark detection process does not need the original image,and realizes blind extraction.Experimental results show that the adaptive algorithm has not only good concealment under various attacks,but also stronger robustness,and solves the contradiction between watermarking robustness and concealment.It provides reference for watermark design

关 键 词：盲水印 小波变换 数字水印 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]