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| 环形稀疏孔径结构的研究 |
| Study on structure of the annulus sparse aperture |
| 投稿时间：2014-06-29 |
| DOI：10.3969/j.issn.1005-5630.2015.01.010 |
| 中文关键词: 环形稀疏孔径 调制传递函数 模拟成像 图像增强 |
| 英文关键词:annulus sparse aperture modulation transfer function(MTF) simulated imaging image enhancement |
| 基金项目:国家自然科学基金资助项目(61378056);苏州市应用基础研究计划(SYG201323);苏州市重点实验室项目(SZS201202);江苏省研究生教改项目(JGLX12-094) |
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| 中文摘要: |
| 介绍环形稀疏孔径的结构,分析环形光瞳的填充因子,并推导出环形稀疏孔径调制传递函数(MTF)的解析式。用MATLAB软件对其进行模拟,并利用Zemax光学设计软件设计环形稀疏孔径光学系统,得到调制传递函数图像,与理论推导的结果相吻合。采用标准分辨率板,在不同填充因子的环形稀疏孔径光学系统下进行模拟成像;利用分数阶微分算子对模拟所得的图像进行图像加强,改善环形稀疏孔径光学系统成像质量。 |
| 英文摘要: |
| The sparse aperture structure of annulus is introduced, and its fill factor is analyzed. The modulation transfer function (MTF) is derived, and the three-dimensional modulation transfer function is simulated by MATLAB software. An example of annulus sparse aperture is designed by Zemax software, from which the MTF is obtained, the result agrees well with the theoretical analysis. The MTF simulated by Zemax software is consistent with that of the theoretical results. A resolution plate is used as the target object to simulate imaging of the annulus sparse aperture system under different fill factors. The fractional differential operator is used to enhance the images to improve the contrast decline of annulus sparse aperture, and the result is shown that the image quality is improved obviously. |
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