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Appl. Sci. 2017, 7(2), 151; doi:10.3390/app7020151

PSF Estimation of Space-Variant Ultra-Wide Field of View Imaging Systems

Department of Radioelectronics, Faculty of Electrical Engineering, Czech Technical University in Prague, Technická 2, 166 27 Prague 6, Czech Republic
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Author to whom correspondence should be addressed.
Academic Editor: Alexei V. Sokolov
Received: 3 October 2016 / Revised: 23 January 2017 / Accepted: 25 January 2017 / Published: 8 February 2017
(This article belongs to the Section Optics and Lasers)
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Abstract

Ultra-wide-field of view (UWFOV) imaging systems are affected by various aberrations, most of which are highly angle-dependent. A description of UWFOV imaging systems, such as microscopy optics, security camera systems and other special space-variant imaging systems, is a difficult task that can be achieved by estimating the Point Spread Function (PSF) of the system. This paper proposes a novel method for modeling the space-variant PSF of an imaging system using the Zernike polynomials wavefront description. The PSF estimation algorithm is based on obtaining field-dependent expansion coefficients of the Zernike polynomials by fitting real image data of the analyzed imaging system using an iterative approach in an initial estimate of the fitting parameters to ensure convergence robustness. The method is promising as an alternative to the standard approach based on Shack–Hartmann interferometry, since the estimate of the aberration coefficients is processed directly in the image plane. This approach is tested on simulated and laboratory-acquired image data that generally show good agreement. The resulting data are compared with the results of other modeling methods. The proposed PSF estimation method provides around 5% accuracy of the optical system model. View Full-Text
Keywords: space-variant point spread function; optical system modeling; Zernike polynomials space-variant point spread function; optical system modeling; Zernike polynomials
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MDPI and ACS Style

Janout, P.; Páta, P.; Skala, P.; Bednář, J. PSF Estimation of Space-Variant Ultra-Wide Field of View Imaging Systems. Appl. Sci. 2017, 7, 151.

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