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Influence of lens defocus on the image quality in the process of the thermal imaging systems evaluation

C. PLESA1,* , C. TODIRICA1, I. NICOLA1, D. TURCANU1, C. PREDOI1, P. SOMOIAG2

Affiliation

  1. Military Equipment and Technologies Research Agency, 16 Aeroportului Street, Clinceni, Ilfov, Romania
  2. Military Technical Academy “Ferdinand I”, Bucharest, 39-49 George Coşbuc Avenue

Abstract

This paper presents some aspects regarding the effects of lens defocus on the image quality in case of the thermal imaging systems. Starting from the assumption that the thermal imaging systems are linear systems, the defocusing of the optical system (as a part of the thermal imaging systems) has a direct influence on the modulation transfer function and on the image quality also. The paper highlights that when it is desired to evaluate the superior limit performance of a thermal vision system, it is absolutely necessary to achieved the lens focusing by tracking both the edge spread function and the line spread function..

Keywords

Modulation transfer function, Thermal, Defocus, Image quality, Infrared, Edge spread function, Line spread function, Uniformity.

Citation

C. PLESA, C. TODIRICA, I. NICOLA, D. TURCANU, C. PREDOI, P. SOMOIAG, Influence of lens defocus on the image quality in the process of the thermal imaging systems evaluation, Optoelectronics and Advanced Materials - Rapid Communications, 13, 7-8, July-August 2019, pp.458-462 (2019).

Submitted at: March 11, 2019

Accepted at: Aug. 20, 2019