| 分数傅立叶变换域的一种鲁棒性图像水印算法 |
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| 引用本文： | 张贞凯,田雨波,王建华.分数傅立叶变换域的一种鲁棒性图像水印算法[J].江苏科技大学学报(社会科学版),2009,23(2):150-154. |
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| 作者姓名： | 张贞凯 田雨波 王建华 |
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| 作者单位： | 江苏科技大学,电子信息学院,江苏,镇江,212003
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| 基金项目： | 江苏省教育厅高校自然科学基金 |
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| 摘 要： | 为了进一步提高水印算法的鲁棒性,选取chirp信号作为水印信号,将其嵌入到图像的离散分数傅立叶变换域中.使用分数傅立叶变换阶次和嵌入位置作为算法中的两个密钥,并根据chirp信号在分数傅立叶变换域呈现冲激的特征来检测水印信号.同时还在图像的离散傅立叶变换中频区域嵌入水印模板,有效补偿几何攻击带来的图像损失.仿真实验结果证明,算法具有很好的安全性和不可见性,不仅可以很好的抵抗常用的信号处理操作,对几何攻击也有很好的鲁棒性.
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| 关 键 词： | 图像水印 chirp信号 分数傅立叶变换 鲁棒性 离散傅立叶变换 |
A novel algorithm for image watermarking in fractional Fourier transform domain |
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| Zhang Zhenkai,Tian Yubo,Wang Jianhua.A novel algorithm for image watermarking in fractional Fourier transform domain[J].Journal of Jiangsu University of Science and Technology:Natural Science Edition,2009,23(2):150-154. |
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| Authors: | Zhang Zhenkai Tian Yubo Wang Jianhua |
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| Institution: | School of Electronics and Information;Jiangsu University of Science and Technology;Zhenjiang Jiangsu 212003;China |
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| Abstract: | In order to improve the robustness of image watermarking,a novel algorithm for digital image watermarking was presented.The algorithm embedded a chirp signal in the discrete fractional Fourier transform(FRFT) domain,and used the watermark position and the transform order as the encryption keys.Because a chirp signal can produce a strong impulse in the FRFT domain,the watermark can be detected conveniently.The template embedded in the DFT domain can compensate for the images losses caused by geometric attack... |
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| Keywords: | image watermarking chirp signal fractional Fourier transform robustness DFT |
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