| 稀疏孔径系统的成像和图像复原 |
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| 引用本文： | 吴泉英,钱霖,沈为民.稀疏孔径系统的成像和图像复原[J].四川激光,2005,26(6):40-42. |
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| 作者姓名： | 吴泉英 钱霖 沈为民 |
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| 作者单位： | [1]苏州科技学院实验中心,苏州215006 [2]苏州大学江苏省现代光学技术重点实验室,苏州215009 [3]苏州大学物理科学技术学院,苏州215006 |
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| 基金项目： | 江苏省自然科学基金项目(BK2004202)资助，教育部博士学科点基金项目(20040285001)资助，江苏省现代光学技术重点实验室开放课题(T8108030)资助 |
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| 摘 要： | 介绍复合三子镜和Golay6稀疏孔径系统的结构和调制传递函数(MTF),给出复合三子镜的MTF解析表达式,分析和比较两种稀疏孔径系统的MTF分布,并计算它们在不同填充因子下对应的最大截止频率和等效直径,并对复合三子镜和Golay6稀疏孔径系统进行模拟成像。MTF分析和模拟成像结果表明:稀疏孔径系统由于通光面积减少,在截止频率区域内MTF明显下降,图像清晰度下降。因此,图像复原是稀疏孔径系统的关键环节。进一步阐述Wiener滤波图像复原的原理,并给出应用修正Wiener滤波技术进行加噪图像复原的结果。
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| 关 键 词： | 空间遥感 稀疏孔径 调制传递函数 图像复原 |
| 文章编号： | 0253-2743(2005)06-0040-03 |
| 收稿时间： | 2004-04-05 |
| 修稿时间： | 2004年4月5日 |
Image recovering for sparse- aperture systems |
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| WU Quan- ying, QIAN Lin, SHEN Wei- min.Image recovering for sparse- aperture systems[J].Laser Journal,2005,26(6):40-42. |
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| Authors: | WU Quan- ying QIAN Lin SHEN Wei- min |
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| Abstract: | The sparse-aperture configurations of dual three sub-apertures and Golay6are introduced.Their corresponding Modulation Transfer Functions(MTF)have been described and compared with each other.The MTF analytical formulas of dual three sub-apertures is given out.The maximal cut-off frequen-cies and effective diameters of dual three sub-apertures and Golay6are calculated under different fill factors.This study also generates image simulation for dual three sub-apertures and Golay6.The images of sparse-aperture systems become blurry because of the MTF loss,and it is also expounded through image simula-tion.It is a key aspect to recover images for sparse-aperture aperture.The principle of image recoveringwith Wiener filter is presented,and the modified Wiener filtering method has been shown to restore the images with noise. |
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| Keywords: | space remote sensing sparse aperture modulation transfer Function Wiener filter image recovering |
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