| 图像拟仿射变换的DWT水印算法 |
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| 引用本文： | 林晓圆,赵健,谢瑜,余秋菊.图像拟仿射变换的DWT水印算法[J].计算机工程与应用,2011,47(12):84-86. |
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| 作者姓名： | 林晓圆 赵健 谢瑜 余秋菊 |
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| 作者单位： | 西北大学,信息科学与技术学院,西安,710127 |
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| 基金项目： | 中国博士后科学基金，陕西省自然科学基础研究项目 |
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| 摘 要： | 提出一种图像拟仿射变换的DWT水印算法。该算法对水印图像的预处理采用有限整数域上的拟仿射变换,拟仿射变换有较好的置乱效果及较大的置乱周期,从图像信息加密的安全性角度来看,它优于Arnold等常见的几何置乱变换,利用混沌序列提取原始图像的若干块组成子图像,并对子图像进行三次小波变换,将加密图像嵌入到子图像中,并将子图像还原到原始图像的相应位置。实现了水印的透明性和鲁棒性。仿真实验结果表明,算法对常见的图像攻击具有较强的鲁棒性和稳健性。
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| 关 键 词： | 拟仿射变换 离散小波变换 混沌序列 数字水印 |
| 修稿时间： | |
Digital watermarking algorithm based on DWT and quasi affine transformation |
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| LIN Xiaoyuan,ZHAO Jian,XIE Yu,YU Qiuju.Digital watermarking algorithm based on DWT and quasi affine transformation[J].Computer Engineering and Applications,2011,47(12):84-86. |
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| Authors: | LIN Xiaoyuan ZHAO Jian XIE Yu YU Qiuju |
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| Affiliation: | Department of Information Science and Technology,Northwestern University,Xi’an 710127,China |
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| Abstract: | It presented an digital watermarking algorithm based on DWT and quasi affine transformation.The algorithm uses quasi affine transformation to encrypt the watermark image in a limited integer field.Because quasi affine transformation has a good effect of the charateristics of scrambling and a longer period of scrambling.It is more secure than the common transformation,like Arnold and other geometric transformations.It extracts a number of blocks from the original image using chaotic sequence, and forms a new sub-image using those blocks,then makes the sub-image go to three wavelet transformations. The encrypted watermarking image is embedded into the sub-image, then the blocks of the sub-image are put into the origi- nal position in the original image.Experimental results show that this algorithm is robust and stable to common digital image processing operations. |
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| Keywords: | quasi affine transformation Discrete Wavelet Transform（DWT） chaotic sequence digital watermarking |
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