| 基于最优小波包变换和离散余弦变换的灰度图像水印算法 |
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| 引用本文： | 许慧,谭阳红,孙磊,龙伯华.基于最优小波包变换和离散余弦变换的灰度图像水印算法[J].电路与系统学报,2009,14(1). |
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| 作者姓名： | 许慧 谭阳红 孙磊 龙伯华 |
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| 作者单位： | 湖南大学,电气与信息工程学院,湖南,长沙,410082 |
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| 基金项目： | 国家自然科学基金，湖南省自然科学基金，教育部博士基金，高等学校新世纪优秀人才支持计划 |
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| 摘 要： | 本文提出了一种基于最优小波包变换和离散余弦变换的灰度图像水印算法,利用Arnold变换和Baker映射对水印图像进行置乱,并将置乱结果进行分块,对宿主图像进行最优小波包分解,然后修改低频子带系数来嵌入水印信息.嵌入前,利用离散余弦变换去除低频子带相邻系数的相关性后嵌入经过同样处理的置乱水印子块.实验表明该算法在抵抗噪声、滤波、旋转剪切等攻击下有比较好的鲁棒性.
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| 关 键 词： | 小波包变换 离散余弦变换 数字水印 |
The algorithm of gray image watermark based on best wavelet packet and discrete cosine transform |
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| XU Hui,TAN Yang-hong,SUN Lei,LONG Bo-hua.The algorithm of gray image watermark based on best wavelet packet and discrete cosine transform[J].Journal of Circuits and Systems,2009,14(1). |
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| Authors: | XU Hui TAN Yang-hong SUN Lei LONG Bo-hua |
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| Affiliation: | XU Hui,TAN Yang-hong,SUN Lei,LONG Bo-hua(College of Electrical , Information Hunan University,Changsha 410082,China) |
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| Abstract: | Based on best wavelet packet transform(BWPT) and discrete cosine transform(DCT),a novel algorithm of gray image watermark is proposed.Watermark image is scrambled through Arnold transform and Baker mapping,and then is divided into four blocks.The host image is decomposed based on BWPT.The process is completed by modifying low frequency band coefficients of host image.Before watermark embeded,DCT is used to reduce the correlation of the low frequency band adjacent coefficients of host image,then watermark-bl... |
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| Keywords: | WPT DCT digital watermark |
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