An optimized knife-edge method for on-orbit MTF estimation of optical sensors using powell parameter fitting

Lu Han, Kun Gao*, Chen Gong, Zhenyu Zhu, Yue Guo

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Citation (Scopus)

Abstract

On-orbit Modulation Transfer Function (MTF) is an important indicator to evaluate the performance of the optical remote sensors in a satellite. There are many methods to estimate MTF, such as pinhole method, slit method and so on. Among them, knife-edge method is quite efficient, easy-to-use and recommended in ISO12233 standard for the wholefrequency MTF curve acquisition. However, the accuracy of the algorithm is affected by Edge Spread Function (ESF) fitting accuracy significantly, which limits the range of application. So in this paper, an optimized knife-edge method using Powell algorithm is proposed to improve the ESF fitting precision. Fermi function model is the most popular ESF fitting model, yet it is vulnerable to the initial values of the parameters. Considering the characteristics of simple and fast convergence, Powell algorithm is applied to fit the accurate parameters adaptively with the insensitivity to the initial parameters. Numerical simulation results reveal the accuracy and robustness of the optimized algorithm under different SNR, edge direction and leaning angles conditions. Experimental results using images of the camera in ZY-3 satellite show that this method is more accurate than the standard knife-edge method of ISO12233 in MTF estimation.

Original languageEnglish
Title of host publicationOptics and Photonics for Information Processing XI
EditorsVictor H. Diaz-Ramirez, Andres Marquez, Abdul A. S. Awwal, Mireya Garcia Vazquez, Khan M. Iftekharuddin
PublisherSPIE
ISBN (Electronic)9781510612471
DOIs
Publication statusPublished - 2017
EventOptics and Photonics for Information Processing XI 2017 - San Diego, United States
Duration: 7 Aug 20178 Aug 2017

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
Volume10395
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X

Conference

ConferenceOptics and Photonics for Information Processing XI 2017
Country/TerritoryUnited States
CitySan Diego
Period7/08/178/08/17

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Han, L., Gao, K., Gong, C., Zhu, Z., & Guo, Y. (2017). An optimized knife-edge method for on-orbit MTF estimation of optical sensors using powell parameter fitting. In V. H. Diaz-Ramirez, A. Marquez, A. A. S. Awwal, M. G. Vazquez, & K. M. Iftekharuddin (Eds.), Optics and Photonics for Information Processing XI Article 1039506 (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 10395). SPIE. https://doi.org/10.1117/12.2271800