| 一种基于Contourlet变换的图像去噪方法 |
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| 引用本文： | 李瑶 董瑞 何韬 梁栋. 一种基于Contourlet变换的图像去噪方法[J]. 微机发展, 2007, 17(3): 81-83 |
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| 作者姓名： | 李瑶 董瑞 何韬 梁栋 |
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| 作者单位： | 安徽大学计算智能与信号处理教育部重点实验室，安徽大学电子科学与技术学院 安徽合肥230039，安徽合肥230039 |
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| 基金项目： | 国家自然科学基金项目(60473102)，安徽省高等学校自然科学研究项目(2005KJ005ZD)，安徽大学211工程学术创新团队资助项目 |
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| 摘 要： | 在变换域阈值去噪过程中,阈值的选取和阈值处理方法至关重要。提出一种基于contourlet变换的图像去噪方法。采用分层阈值,为每一级contourlet系数选取一个阈值。阈值处理中给出一种基于邻域的阈值处理方法,不仅考虑单个系数幅值的大小,而且考虑它的邻域系数幅值的大小。同时为了抑制在去噪图像边缘附近的伪吉布斯效应,引入cycle spin-ning来抑制这种图像失真。实验结果表明,利用文中去噪方法进行去噪比其他方法得到更好的视觉效果和更高的PSNR值。
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| 关 键 词： | contourlet变换 分层阈值 cycle spinning 图像去噪 |
| 文章编号： | 1673-629X(2007)03-0081-03 |
| 修稿时间： | 2006-06-06 |
A Method for Image Denoising Based on Contourlet Transform |
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| LI Yao,DONG Rui,HE Tao,LIANG Dong. A Method for Image Denoising Based on Contourlet Transform[J]. Microcomputer Development, 2007, 17(3): 81-83 |
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| Authors: | LI Yao DONG Rui HE Tao LIANG Dong |
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| Abstract: | A method for image denoising based on the contourlet transform is proposed in this paper.Resolution-dependent thresholding is used to set a threshold for each stage of contourlet coefficients.A thresholding operator based on the neighborhood is introduced in the thresholding,considering not only the magnitude of a single coefficient but also the magnitudes of the coefficients in its neighborhood.Because the transform is shift-variant and leads to artifacts,cycle spinning is employed in this paper to restrain Gibbs-like phenomena near the image edges.The experimental results indicate that this method can get better visual effect and higher PSNR value than others. |
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| Keywords: | contourlet transform resolution-dependent thresholding cycle spinning image denoising |
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