| 抗混叠塔型变换的构造 |
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| 引用本文： | 冯鹏,魏彪,潘英俊,米德伶.抗混叠塔型变换的构造[J].电子学报,2009,37(11):2510-2514. |
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| 作者姓名： | 冯鹏 魏彪 潘英俊 米德伶 |
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| 作者单位： | 1. 重庆大学光电技术及系统教育部重点实验室,重庆,400044;重庆大学生物医学工程博士后流动站,重庆,400044
2. 重庆大学光电技术及系统教育部重点实验室,重庆,400044 |
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| 摘 要： | 针对Contourlet变换存在的频谱混叠,提出了一种抗混叠塔型变换,即Non-aliasing Pyramidal Transform-NA-D变换.NAP变换由抗混叠塔式滤波器组(Non-aliasing Filter Banks:NPFB)和方向滤波器组(Directional Filter Banks:DFB)组成,NPFB首先将图像分解为多个不同分辨率的细节子带和一个低频子带,DFB再将各细节子带分解为方向子带.通过设计满足Nyquist采样定理的滤波器,NA-D变换有效地抑制了Contourlet变换的频谱混叠,基函数不仅具有"多分辨率"、"多方向"、"局域性"等特性,满足各向异性尺度关系,而且空频域正则形和局域性均明显优于Contourlet变换.硬阈值去噪实验的结果表明,NAP变换能够更为稀疏的表示图像,并在去噪性能上较Contourlet变换有较大提高.
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| 关 键 词： | Contourlet变换 抗混叠塔式滤波器组 基函数 图像去噪 |
| 收稿时间： | 2008-08-25 |
Construction of Non-Aliasing Pyramidal Transform |
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| FENG Peng,WEI Biao,PAN Ying-jun,MI De-ling.Construction of Non-Aliasing Pyramidal Transform[J].Acta Electronica Sinica,2009,37(11):2510-2514. |
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| Authors: | FENG Peng WEI Biao PAN Ying-jun MI De-ling |
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| Institution: | FENG Peng1,2,WEI Biao1,PAN Ying-jun1,MI De-ling1(1.Key Laboratory of Opto-Electronics Technology and System,Ministry of Education,Chongqing University,Chongqing 400044,China,2.Postdoctoral Research Station of Biomedical Engineering,China) |
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| Abstract: | A non-aliasing Pyramidal transform,namely NAP transform,is presented to avoid the frequency aliasing of Contourlet transform.NAP transform consists of non-aliasing pyramidal filter banks(NPFB) and DFB.In this paper,we firstly represent the definition and specific parameter setting of NPFB in the frequency domain.NPFB decomposes image into an approximation subband and several detail subbands with different resolutions;whilst DFB decomposes the detail subbands into directional subbands.Not only has the basis ... |
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| Keywords: | contourlet transform non-aliasing pyramidal filter banks basis function image denoising |
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