
Proceedings Paper
An optimized knife-edge method for on-orbit MTF estimation of optical sensors using powell parameter fittingFormat | Member Price | Non-Member Price |
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Paper 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.
Paper Details
Date Published: 12 September 2017
PDF: 9 pages
Proc. SPIE 10395, Optics and Photonics for Information Processing XI, 1039506 (12 September 2017); doi: 10.1117/12.2271800
Published in SPIE Proceedings Vol. 10395:
Optics and Photonics for Information Processing XI
Khan M. Iftekharuddin; Abdul A. S. Awwal; Mireya García Vázquez; Andrés Márquez; Víctor H. Diaz-Ramirez, Editor(s)
PDF: 9 pages
Proc. SPIE 10395, Optics and Photonics for Information Processing XI, 1039506 (12 September 2017); doi: 10.1117/12.2271800
Show Author Affiliations
Published in SPIE Proceedings Vol. 10395:
Optics and Photonics for Information Processing XI
Khan M. Iftekharuddin; Abdul A. S. Awwal; Mireya García Vázquez; Andrés Márquez; Víctor H. Diaz-Ramirez, Editor(s)
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