| 基于小波变换和离散余弦变换的数字水印方法 |
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| 引用本文： | 赵鸿燕,曹汉强,李旭涛,赵碧蓉.基于小波变换和离散余弦变换的数字水印方法[J].华中科技大学学报(自然科学版),2003,31(5):41-43. |
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| 作者姓名： | 赵鸿燕 曹汉强 李旭涛 赵碧蓉 |
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| 作者单位： | 1. 华中科技大学电子与信息工程系
2. 华南理工大学自动化科学与工程学院 |
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| 基金项目： | 国家自然科学基金资助项目 (60 2 70 99) |
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| 摘 要： | 提出一种以灰度或彩色图像作为水印、基于小波变换的数字水印算法．该算法将宿主图像分解为小波系数，利用小波变换的自相似性构造QSWT选择并排序系数来嵌入水印，在嵌入水印之前对水印图像进行离散余弦变换(DCT)并做Z扫描，使水印信息也做一个大致的排序嵌入在宿主图像中来增强算法隐蔽性和鲁棒性．实验结果表明，本方法能有效地抵抗一些常见的水印攻击．
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| 关 键 词： | 图像处理 离散小波变换（DWT） 数字水印 |
| 文章编号： | 1671-4512(2003)05-0041-03 |
| 修稿时间： | 2002年10月24 |
The method for watermarking based on wavelet transformation and discrete cosine transformation |
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| Zhao Hongyan Cao Hanqiang Li Xutao Zhao Birong Zhao Hongyan Postgraduate, Dept. of Electronics & Information Eng.,Huazhong Univ. of Sci. & Tech.,Wuhan ,China..The method for watermarking based on wavelet transformation and discrete cosine transformation[J].JOURNAL OF HUAZHONG UNIVERSITY OF SCIENCE AND TECHNOLOGY.NATURE SCIENCE,2003,31(5):41-43. |
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| Authors: | Zhao Hongyan Cao Hanqiang Li Xutao Zhao Birong Zhao Hongyan Postgraduate Dept of Electronics & Information Eng Huazhong Univ of Sci & Tech Wuhan China |
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| Institution: | Zhao Hongyan Cao Hanqiang Li Xutao Zhao Birong Zhao Hongyan Postgraduate, Dept. of Electronics & Information Eng.,Huazhong Univ. of Sci. & Tech.,Wuhan 430074,China. |
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| Abstract: | The method for watermarking based on wavelet transform was proposed by using a gray or color image as watermark. The origin host image was decomposed into wavelet coefficients. Owing to the self-similitude of wavelet transform, the qualified significant wavelet trees (QSWT) were constructed and were sorted by I_l(x_k,y_k) to a QSWT sequence, QSWT_ k(x,y) . Before being embedded, watermark image was transformed to DCT coefficients and arranged by z-shape scan to enhance robustness of the approach and its imperceptibility. The experiment results indicated that the method can resist some typical watermarking attacks such as JPEG compressing, noise, filtering and so on. |
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| Keywords: | image processing discrete wavelet transform digital watermark |
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