| 一种基于小波变换的鲁棒水印算法 |
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| 引用本文： | 余江龙,张学杰. 一种基于小波变换的鲁棒水印算法[J]. 云南大学学报(自然科学版), 2004, 26(6): 492-496,520 |
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| 作者姓名： | 余江龙 张学杰 |
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| 作者单位： | 云南大学,计算机科学与工程系,云南,昆明,650091 |
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| 基金项目： | 云南省科技攻关重点资助项目 (2 0 0 2GG1 5 )，云南省自然科学基金资助项目 (2 0 0 0YP2 0 )，云南省省院省校合作基金资助项目 (2 0 0 1JAALA 0 2A0 2 2 ) |
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| 摘 要： | 提出了一种基于小波变换和余弦变换的鲁棒水印算法.此算法首先对原始图像进行一级小波分解,再对其低频系数进行离散余弦变换,调整DCT中频系数的相对值,最后把由{-1,1}组成的伪随机序列嵌入其中.试验结果显示,此算法对JPEG压缩、高斯噪音污染有较强的鲁棒性.
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| 关 键 词： | 数字图像水印 小波变换 余弦变换 |
| 文章编号： | 0258-7971(2004)06-0492-05 |
A robust watermarking algorithm based on discrete wavelet transform |
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| YU Jiang-long,ZHANG Xue-jie. A robust watermarking algorithm based on discrete wavelet transform[J]. Journal of Yunnan University(Natural Sciences), 2004, 26(6): 492-496,520 |
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| Authors: | YU Jiang-long ZHANG Xue-jie |
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| Affiliation: | Department of Computer Science and Engineering, Yunnan University, Kunming 650091, China |
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| Abstract: | A robust watermarking algorithm based on DWT and DCT is proposed.Firstly the original image is first-level discrete wavelet transformed,the first level low frequency coefficients are discrete cosine transformed,and then DCT mid-frequency coefficients are adjusted in which pseudorandom number sequences ({-1,1})are embedded.Moreover,experimental results have proved that the method has good robustness to JPEG compression,Gaussian noise pollution. |
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| Keywords: | digital image watermark discrete wavelet transform discrete cosine transform |
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