Mr. Xiaoyao Liu Profile

Xiaoyao Liu

at Nanjing Univ of Posts And Telecommunications

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Proceedings Article | 19 November 2019 Paper

Image characteristics and restoration for multi-sub-mirror synthetic aperture system

Xiaoyao Liu, Zhongcheng Liang, Weiqian Hao, Rui Zhao, Meimei Kong, Jian Fei Guan, Yue Zhang

Proceedings Volume 11184, 111840Z (2019) https://doi.org/10.1117/12.2536662

KEYWORDS: Image restoration, Imaging systems, Image quality, Modulation transfer functions, Image filtering, System integration, Imaging arrays, Signal to noise ratio, Electronic filtering, Liquids

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This paper introduces radial multi-sub-mirror (MSM) synthetic aperture system structure and imaging characteristics of the liquid lens based, and the MSM array for the simulate imaging and image restoration. In order to obtain the scaling invariance of MSM system imaging, the dimensionless method is used to reduce the structural parameters. Baseline statistical distribution diagram and modulation transfer function (MTF) are used to analyze the structural characteristics and intermediate frequency(IF) characteristics. The MSM optical characteristics are calculated and the raw image is simulated under different filling factors. For the reduction of the IF characteristics of the synthetic aperture system, the raw image is restored by Wiener filtering. Using the standard deviation and peak signal-to-noise ratio between the synthetic aperture imaging system and the filled aperture imaging system, these two indicators evaluate the image quality with different fill factors. A comparative analysis of the restored images yields a relationship between filling factor and image quality. Since the large number of sub-mirrors in the MSM array, resulting in a larger number of different baselines. Because the baseline corresponds to the distribution characteristics of spatial frequency, the baseline of the MSM has a large number of repeats in the IF region, so the structure has a good response of IF. The results showed that as the sub-aperture diameter increases, the imaging quality of the MSM structure becomes better. The image restoration effect enhance with the increase of the filling factor. After wiener filtering, the image quality is improved.

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