一种彩色数字图像多功能双水印算法  

A Multi-purpose Dual Watermark Algorithm of Color Digital Image

作　　者：王娟[1] 林耀进[1] 沈东升[1] 

机构地区：[1]闽南师范大学计算机学院,福建漳州363000

出　　处：《闽南师范大学学报（自然科学版）》2015年第2期26-34,共9页Journal of Minnan Normal University：Natural Science

基　　金：国家自然科学基金项目(61303131);福建省教育厅科技项目(JA14192);漳州市科技项目(ZZ2014J14)

摘　　要：针对彩色图像单水印算法存在功能单一的局限,利用离散小波变换与奇异值分解的特性,提出了一种新的多功能双水印算法.算法通过提取宿主彩色图像的R、G、B三个通道,对蓝色分量的离散小波低频系数进行分块,对块进行奇异值分解.然后,将版权水印量化嵌入奇异值中,量化步长根据小波系数自适应生成.最后,根据红色分量生成认证水印,对绿色分量分块并进行奇异值分解,将认证水印自适应量化嵌入在奇异值中.实验结果表明,版权水印具有较强的抗攻击鲁棒性及透明性,认证水印对篡改敏感,并能对篡改进行精确定位.所提算法具备版权保护与内容认证的双重功能.The single watermark algorithm for color image only has single function. To overcome the drawback, a new multi-purpose dual watermark algorithm is proposed based on discrete wavelet transform and singular value decomposition.Through extracting three channels of R, G, and B from the host color image, it divides the low frequency coefficient of blue component＇s discrete wavelet into several blocks, and each block conducts singular value decomposition. Then, copyright watermark is embedded quantitative singular value based on the adaptive quantization step length according to the wavelet coefficients, and the authentication watermark is generated according to the red component. Finally, green component is divided into several blocks, in which each block conducts singular value decomposition, and the authentication watermark is embedded in the adaptive quantization singular value. Experimental results show that the copyright watermark has better robustness against attack and transparency, and the authentication watermark is sensitive to tamper and has good accuracy of tamper localization. It can conclude that the proposed algorithm has the double function of copyright protection and content authentication.

关 键 词：离散小波变换 奇异值分解 双水印 篡改检测 篡改定位 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]