一种二维混沌加密彩色图像自适应水印算法
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摘要
数字水印技术可以有效地保护数字产品的版权,维护数据安全。现有的数字水印方法大多数针对灰度图像,而较少研究彩色图像。但是与灰度图像水印相比,彩色图像水印含有更多的信息。因此,文中提出了一种二维混沌加密的彩色图像自适应水印算法。经过二维logistic混沌迭代生成加密水印。在水印嵌人过程中,把彩色图像亮度分量分成互不重叠的图像块,用分数盒维数分析各块的特征,提取特征块和次特征块,对它们分别进行一级小波分解,先将水印以不同强度自适应地嵌入到特征块的小波域低频子图中,在保证隐蔽性的前提下,再次将水印以不同强度自适应地嵌入到次特征块的小波域低频子图中。实验结果表明,该算法对JPEG压缩、加噪、剪切、滤波等具有较强的稳健性。
Digitalwatermark technique is effective in protecting copyright of digital products and maintaining data security.Existing digital watermarking algorithms are mostly designed against gray images but few are for the color images.This paper presents a color image watermarking algorithm based on two dimension chaos encryption.Use the two dimension logistic chaotic map to generate the watermark.An original image is divided into non-overlapped blocks,fractional box-counting dimension is used to analyze the feature of the image blocks to extract the feature blocks and secondary feature blocks and then used one level DWT to decompose them.The different strength watermark is adaptively embedded into the low-frequency coefficients of the feature blocks,under the condition that the watermark embedded is invisible,and then is embedded into the secondary feature blocks in the same way when embedded watermarking.Experimental results demonstrate that the watermarking scheme is strongly robust to different types of attacks such as JPEG compression,noise addition,cropping,filtering and so on.
Digitalwatermark technique is effective in protecting copyright of digital products and maintaining data security.Existing digital watermarking algorithms are mostly designed against gray images but few are for the color images.This paper presents a color image watermarking algorithm based on two dimension chaos encryption.Use the two dimension logistic chaotic map to generate the watermark.An original image is divided into non-overlapped blocks,fractional box-counting dimension is used to analyze the feature of the image blocks to extract the feature blocks and secondary feature blocks and then used one level DWT to decompose them.The different strength watermark is adaptively embedded into the low-frequency coefficients of the feature blocks,under the condition that the watermark embedded is invisible,and then is embedded into the secondary feature blocks in the same way when embedded watermarking.Experimental results demonstrate that the watermarking scheme is strongly robust to different types of attacks such as JPEG compression,noise addition,cropping,filtering and so on.
引文
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[4]刘英,孙丽莎.基于三维猫映射的图像加密算法[J].计算机工程与应用,2005,41(36):127-130.
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[8]丁文霞,卢焕章,王浩,等.一种基于混沌的彩色图像空域半脆弱水印算法[J].国防科技大学学报,2008,30(4):59-63.
[9]王丽娜,郭迟,李鹏.信息隐藏技术实验教程[M].武汉:武汉大学出版社,2004.
[10]姜炳强,江铭炎,赵立军.一种新的基于小波变换与混沌加密的彩色数字水印算法[J].山东大学学报,2004,34(3):68-71.
[11]陈禺页,陈凌.分形几何学[M].第2版.北京:地震出版社,2005:54-71.
[12]Feng J.Fractional fractal geometry for image processing[D].USA:Northwestern University,2000.
[13]Ni Rongrong,Ruan Qiuqi,Cheng H D.Secure semi-blind wa-termarking based on iteration mapping and image features[J].Pattern Recognition,2005,38:357-368.
[14]余成波.数字图像处理及MATLAB实现[M].重庆:重庆大学出版社,2003.
[2]Chiaraluce F,Cicarelli L.A new chaoticalgorithm for videoencryption[J].IEEE Trans Consum Electron,2002,48(4):838-844.
[3]焦占亚,王蕊.时空二维混沌的JPEG2000数字水印算法研究[J].计算机与数字工程,2008,36(3):108-113.
[4]刘英,孙丽莎.基于三维猫映射的图像加密算法[J].计算机工程与应用,2005,41(36):127-130.
[5]Shi C,Bhargara B.Light-Weigh MPEG video encryptionalgorithm[C]∥In:Proceeding of the International conferenceon Multimedia’98.New Delhi,India:[s.n.],1998:55-61.
[6]齐东旭,邹建成.一类新的置乱变换及其在图像信息隐蔽中的应用[J].中国科学,2000,30(5):440-447.
[7]罗维潮,付永庆.一种基于小波变换的二维Logistic混沌图像加密算法[J].黑龙江工程学院学报:自然科学版,2007,6(2):30-43.
[8]丁文霞,卢焕章,王浩,等.一种基于混沌的彩色图像空域半脆弱水印算法[J].国防科技大学学报,2008,30(4):59-63.
[9]王丽娜,郭迟,李鹏.信息隐藏技术实验教程[M].武汉:武汉大学出版社,2004.
[10]姜炳强,江铭炎,赵立军.一种新的基于小波变换与混沌加密的彩色数字水印算法[J].山东大学学报,2004,34(3):68-71.
[11]陈禺页,陈凌.分形几何学[M].第2版.北京:地震出版社,2005:54-71.
[12]Feng J.Fractional fractal geometry for image processing[D].USA:Northwestern University,2000.
[13]Ni Rongrong,Ruan Qiuqi,Cheng H D.Secure semi-blind wa-termarking based on iteration mapping and image features[J].Pattern Recognition,2005,38:357-368.
[14]余成波.数字图像处理及MATLAB实现[M].重庆:重庆大学出版社,2003.
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