Imaging characteristic and image reconstruction ofsynthetic aperture optical system
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摘要: 以Y-4合成孔径系统为基本结构，分析和比较了不同填充因子Y-4系统的U-V平面覆盖、点扩散函数和调制传递函数特性；用Zemax和Matlab软件对系统进行模拟成像，利用维纳滤波和改进的维纳滤波对加噪图像进行复原，使用峰值信噪比(PNSR)标准比较了不同填充因子Y-4系统的复原效果，并分析了影响合成孔径系统成像质量和复原效果的因素。结论如下：通过图像复原，可以极大地改善合成孔径系统所成图像的像质，提高图像的清晰度，使得复原后的图像和其等效单孔径系统所成的像很接近，实现大孔径成像系统的观测效果；图像复原的效果与合成孔径系统的阵列结构和噪声类型有关。Abstract: Optical synthetic-aperture imaging is one of the most potential techniques for improving the resolution of system. U-V coverage, PSF and MTF of synthetic-aperture system were analyzed with different fill factors. They were discussed on the basis of Y-4 system. This study also generated image simulation of Y-4 system with the help of Zemax and Matlab.software, and restored the images with noise making use of Wiener filter and the modified Wiener filter. Reconstruction results of Y-4 system with different fill factors were analyzed and compared with the help of PNSR. The factors which affected the image qualities and reconstruction results of synthetic-aperture system were also analyzed. The results show that image restoration could improve the image quality of synthetic-aperture system and increase its definition, its image quantity is equivalent to a single aperture system and it can achieve the same effect as big aperture system, and the results of image restoration are dependent on the array structure of synthetic-aperture system and noise types.
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Keywords:
- synthetic-aperture optical system /
- U-V coverage /
- PSF /
- MTF /
- Wiener filtering /
- image reconstruction
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