| 基于混沌映射的改进奇偶量化水印算法 |
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| 引用本文： | 陈光喜,白林雪. 基于混沌映射的改进奇偶量化水印算法[J]. 计算机工程与应用, 2007, 43(27): 40-43 |
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| 作者姓名： | 陈光喜 白林雪 |
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| 作者单位： | 桂林电子科技大学,计算科学与数学系,广西,桂林,541004;桂林电子科技大学,计算科学与数学系,广西,桂林,541004 |
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| 摘 要： | 提出了一种基于混沌映射的改进奇偶量化水印算法。算法首先使用混沌序列对待嵌入水印信号进行混沌调制,再经过散列处理的序列定位嵌入的图像块位置及小波系数坐标,运用奇偶量化法嵌入水印信号。在充分考虑了人类视觉系统掩蔽特性的基础上,根据图像本身性质调节量化步长的大小,从而保证了算法的自适应性。而且,考虑到离散小波变换的特性,嵌入水印的位置仅在图像的中频子带。实验结果证明,算法具有更高的不可见性和鲁棒性,可以抵抗较高的压缩攻击。
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| 关 键 词： | 奇偶量化 混沌映射 离散小波变换(DWT) 人类视觉系统(HVS) |
| 文章编号： | 1002-8331（2007）27-0040-04 |
| 修稿时间： | 2007-07-01 |
Improved watermarking algorithm of odd-even based on chaotic map |
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| CHEN Guang-xi,BAI Lin-xue. Improved watermarking algorithm of odd-even based on chaotic map[J]. Computer Engineering and Applications, 2007, 43(27): 40-43 |
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| Authors: | CHEN Guang-xi BAI Lin-xue |
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| Affiliation: | Department of Computing Sciences and Mathematics,Guilin University of Electronic Technology,Guilin,Guangxi 541004,China |
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| Abstract: | An improved watermarking algorithm of odd-even quantification based on chaotic map is proposed.Firstly,the binary watermark image is scrambled by chaotic sequence.Then the position of the image blocks and wavelet coefficients are determined by processed sequences.The disorder watermark bits are embedded into the original image using odd-even quantification.By taking full advantage of the masking characteristics of the human visual system and the adjustment of quantification steps according to the original image,the adaptation is ensured.Finally,by making the best use of the characteristics of the discrete wavelet trans- form,the signal is embedded in the middle frequency bands.The experimental results show that the proposed algorithm is invisible and robust to image processing operations. |
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| Keywords: | odd-even quantification chaotic map Discrete Wavelet Transform(DWT) Human Visual System(HVS) |
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