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Evaluation of turbulence mitigation methods

Author: Eekeren, A.W.M. van · Huebner, C.S. · Dijk, J. · Schutte, K. · Schwering, P.B.W.
Type:article
Date:2014
Publisher: SPIE
Place: Bellingham,WA
Source:Infrared Imaging Systems: Design, Analysis, Modeling, and Testing XXV, 6-8 May 2014, Baltimore, MD, USA
series:
Proceedings of SPIE
Identifier: 513349
doi: doi:10.1117/12.2050314
Keywords: Atmospheric turbulence · Convolution · Imaging systems · Infrared imaging · Motion compensation · Optical systems · Comparative evaluations · Iterative blind deconvolution · Local registration · Mitigation methods · Quantitative measures · Software-based method · Turbulence conditions · Visual and infrared images · Iterative methods · Defence Research · Defence, Safety and Security · Physics & Electronics · II - Intelligent Imaging ; ED - Electronic Defence · TS - Technical Sciences

Abstract

Atmospheric turbulence is a well-known phenomenon that diminishes the recognition range in visual and infrared image sequences. There exist many different methods to compensate for the effects of turbulence. This paper focuses on the performance of two software-based methods to mitigate the effects of low-And medium turbulence conditions. Both methods are capable of processing static and dynamic scenes. The first method consists of local registration, frame selection, blur estimation and deconvolution. The second method consists of local motion compensation, fore-/background segmentation and weighted iterative blind deconvolution. A comparative evaluation using quantitative measures is done on some representative sequences captured during a NATO SET 165 trial in Dayton. The amount of blurring and tilt in the imagery seem to be relevant measures for such an evaluation. It is shown that both methods improve the imagery by reducing the blurring and tilt and therefore enlarge the recognition range. Furthermore, results of a recognition experiment using simulated data are presented that show that turbulence mitigation using the first method improves the recognition range up to 25% for an operational optical system. © 2014 SPIE.