Measuring resolution degradation of long-wavelength infrared imagery in fog

Brian J. Redman; John D. van der Laan; Karl R. Westlake; Jacob W. Segal; Charles F. LaCasse; Andres L. Sanchez; Jeremy B. Wright

doi:10.1117/1.OE.58.5.051806

12 January 2019 Measuring resolution degradation of long-wavelength infrared imagery in fog

Brian J. Redman, John D. van der Laan, Karl R. Westlake, Jacob W. Segal, Charles F. LaCasse, Andres L. Sanchez, Jeremy B. Wright

Author Affiliations +

Optical Engineering, Vol. 58, Issue 5, 051806 (January 2019). https://doi.org/10.1117/1.OE.58.5.051806

Abstract

The scattering of light in fog is a complex problem that affects imaging in many ways. Typically, imaging device performance in fog is attributed solely to reduced visibility measured as light extinction from scattering events. We present a quantitative analysis of resolution degradation in the long-wave infrared regime. Our analysis is based on the calculation of the modulation transfer function from the edge response of a slant edge blackbody target in known fog conditions. We show higher spatial frequencies attenuate more than low spatial frequencies with increasing fog thickness. These results demonstrate that image blurring, in addition to extinction, contributes to degraded performance of imaging devices in fog environments.

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Brian J. Redman, John D. van der Laan, Karl R. Westlake, Jacob W. Segal, Charles F. LaCasse, Andres L. Sanchez, and Jeremy B. Wright "Measuring resolution degradation of long-wavelength infrared imagery in fog," Optical Engineering 58(5), 051806 (12 January 2019). https://doi.org/10.1117/1.OE.58.5.051806

Received: 5 September 2018; Accepted: 12 December 2018; Published: 12 January 2019

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