| 基于非下采样contourlet变换的图像去噪方法 |
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| 引用本文： | 吴昌东. 基于非下采样contourlet变换的图像去噪方法[J]. 西华大学学报(自然科学版), 2011, 30(6) |
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| 作者姓名： | 吴昌东 |
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| 作者单位： | 西华大学电气信息学院,四川成都,610039 |
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| 基金项目： | 四川省信号与信息处理重点实验室(SGXZD0101-10-1) |
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| 摘 要： | 根据非下采样contourlet变换(NSCT)具有多尺度、多方向和平移不变的性质,提出了一种基于NSCT变换的图像去噪方法。首先对图像进行NSCT变换,得到不同尺度、不同方向的信息,然后根据分解所得系数确定阈值,依此阈值进行去噪处理,最后对去噪处理后的系数进行反变换,得到去噪图像。实验表明:该方法比小波变换(WT)及contourle变换(CT)能更稀疏表示图像,可有效消除图像中的伪吉布斯效应及噪声,能达到更好效果及更高的峰值信噪比(PSNR),较好地保持图像细节及纹理。
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| 关 键 词： | 非下采样contourlet变换 contourlet变换 小波变换 图像去噪 |
An Image Denoising Method Based on the Nonsubsampled Contourlet Transform |
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| WU Chang-dong. An Image Denoising Method Based on the Nonsubsampled Contourlet Transform[J]. Journal of Xihua University(Natural Science Edition), 2011, 30(6) |
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| Authors: | WU Chang-dong |
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| Affiliation: | WU Chang-dong(School of Electrical and Information Engineering,Xihua University,Chengdu 610039 China) |
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| Abstract: | Based on the multiscale,multidirection and shift invariance features of Nonsubsampled Contourlet transform(NSCT),A new algorithm for image denoising based on NSCT is proposed.In this paper.first the image is decomposed in different scales and orientations using NSCT.Then the threshold is derived according to each layer decomposition coefficients,which is used in image denoising.Furthermore.the processed coefficients are inversely transformed to get the denoised image.Experimental results show that the propo... |
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| Keywords: | nonsubsampled contourlet transform contourlet transform wavelet transform image denoising |
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