• Journal of Korea Multimedia Society
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• v.10 no.4
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• pp.432-440
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• 2007

In this paper, we propose a small target detection algorithm for FLIR image with complex background. First, we compute the motion information of target from the difference between the current frame and the created background image. However, the slow speed of target cause that it has the very low gray level value in the difference image. To improve the gray level value, we perform the local gamma correction for difference image. So, the detection index is computed by using statistical characteristics in the improved image and then we chose the lowest detection index a true target. Experimental results show that the proposed method has significantly the good detection performance.

• Proceedings of the Optical Society of Korea Conference
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• 2001.02a
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• pp.84-85
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• 2001

광학장비의 결상성능은 회절변조전달 성능(diffraction MTF) 이나 Strehl ratio 로 표시할 수 있다. 광학 렌즈 또는 거울의 표면 형상오차 등에 기인한 광학성능 저하는 이론적으로 잘 알려져 있으며, 입사동에서의 위상변조를 통하여 초분해능 광학계를 개발할려는 연구도 활발히 진행되고 있다. 헬기에 장착되어 야간 표적 획득 시스템으로 사용되고 있는 전방관측 적외선 열상장치는 볼 내부에 장착되며, 적외선 통과창으로서 이용되는 Ge 윈도우를 통하여 외부 영상을 획득한다. (중략)

• Korean Journal of Optics and Photonics
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• v.12 no.6
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• pp.460-462
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• 2001

We have analyzed the characteristics of IR lens mounting with elastomer and applied the results to the mounting of a silicon lens with diameter 117 mm which is the objective of a thermal imaging system. The elastomer, the 577 primerless silicone adhesive (Dow Corning Co.) which is heat cure type, and the mount material, A16061 are used for our analysis. Theoretical analysis gives the result that the space between lens and mount is required to be more than 250 ${\mu}{\textrm}{m}$ under the operational temperature conditions of -40~+6$0^{\circ}C$.