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Article

Research Paper

Journal of the Optical Society of Korea 2016; 20(3): 381-388

Published online June 25, 2016 https://doi.org/10.3807/JOSK.2016.20.3.381

Copyright © Optical Society of Korea.

Measurement of the Modulation Transfer Function of Infrared Imaging System by Modified Slant Edge Method

Hang Li, Changxiang Yan, and Jianbing Shao

Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Science

Received: April 18, 2016; Revised: May 13, 2016; Accepted: May 17, 2016

Abstract

The performance of a staring infrared imaging system can be characterized based on estimating the modulation transfer function (MTF). The slant edge method is a widely used MTF estimation method, which can effectively solve the aliasing problem caused by the discrete undersampling of the infrared focal plane array. However, the traditional slant edge method has some limitations such as the low precision of the edge angle extraction and using the approximate function to fit the edge spread function (ESF), which affects the accuracy of the MTF estimation. In this paper, we propose a modified slant edge method, including an edge angle extraction method that can improve the precision of the edge angle extraction and an ESF fitting algorithm which is based on the transfer function model of the imaging system, to enhance the accuracy of the MTF estimation. This modified slant edge method presents higher estimation accuracy and better immunity to noise and edge angle than other traditional methods, which is demonstrated by the simulation and application experiments operated in our study.

Keywords: Modulation transfer function, Slant edge method, Infrared imaging system, Edge angle, Edge spread function,

OCIS codes: 110.4100; 110.0110; 110.3000