• 대한의용생체공학회:의공학회지
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• 제29권2호
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• pp.89-98
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• 2008

NIRS (Near-infrared Spectroscopy) and DOI (Diffuse Optical Imaging) are relatively new, non-invasive, and non-ionizing methods that measure or image optical properties (Scattering and Absorption Coefficient) and physiological properties (Water Fraction, concentration of Oxy-, Deoxy-Hemoglobin, Cytochrome Oxidase, etc) of biological tissues. In this paper, three different types of NIRS systems, mathematical modeling, and reconstruction algorithms are described. Also, recent applications such as functional brain imaging, optical mammography, NIRS based BMI (Brain-Machine Interface), and small animal study are reviewed.

• 한국정보통신학회논문지
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• 제9권3호
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• pp.622-626
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• 2005

본 논문은 지능형 교통시스템(intelligent transportation system)에 적용될 수 있는 방안으로써, 안정된 영상신호를 제공하여 자동으로 차량안의 승객을 탐지하는 시스템을 제안한다. 제안된 시스템은 높은 대역(upper-band)과 낮은 대역(lowe.-band)의 스펙트럼 강도를 조합하는 근적외선(Near-Infrared) 카메라를 이용하여 안정된 영상신호를 획득할 수 있었으며, 실험결과를 통해 제안된 방법의 효율성을 입증할 수 있었다.

• ETRI Journal
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• 제37권5호
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• pp.1023-1031
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• 2015

In infrared (IR) images, near targets have a transient distribution at the boundary region, as opposed to a steady one at the inner region. Based on this fact, this paper proposes a novel IR target extraction method that uses both a weighted information entropy (WIE) and an adaptive opening filter to extract near finely shaped targets in IR images. Firstly, the boundary region of a target is detected using a local variance WIE of an original image. Next, a coarse target region is estimated via a labeling process used on the boundary region of the target. From the estimated coarse target region, a fine target shape is extracted by means of an opening filter having an adaptive structure element. The size of the structure element is decided in accordance with the width information of the target boundary and mean WIE values of windows of varying size. Our experimental results show that the proposed method obtains a better extraction performance than existing algorithms.

• 한국군사과학기술학회지
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• 제19권6호
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• pp.690-697
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• 2016

EOIS(electro-optical imaging system) is the main target of the laser weapon. Specially, the image sensor will be vulnerable because EOIS focuses the incident laser beam onto the image sensor. Accordingly, the laser-induced damage of the image sensor needs to be identified for the counter-measure against the laser attack. In this study, the laser-induced damage of the CCD image sensor irradiated by the CW(continuous wave) NIR(near infrared) laser was experimentally investigated and mechanisms of those damage occurrences were analyzed. In the experiment, the near infrared CW fiber laser was used as a laser source. As the fluence, which is the product of the irradiance and the irradiation time, increased, the permanent damages such as discoloration and breakdown appeared sequentially. The discoloration occurred when the color filter was damaged and then the breakdown occurred when the photodiode and substrate were damaged. From the experimental results, LIDTs(laser-induced damage thresholds) of damages were roughly determined.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2002년도 Proceedings of International Symposium on Remote Sensing
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• pp.664-669
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• 2002

Intertidal zone (tidal flat) is a place which is sometimes dry and sometimes wet depending on the tidal rhythm. Direct measurement of topography in the intertidal zone is very difficult to be achieved. The interface between wet and dry parts in the tidal flat, which can be identified from near infrared band of satellite image, is a 'depth contour' which corresponds to the sea level at the time of satellite pass. Aquisition of topography data in tidal flat is possible by combining various techniques such as (1) identification of the interface between wet and dry parts, (2) GCP correction of satellite image, and (3) realtime prediction of sea level elevation at the time of satellite pass. The algorithm was successfully applied in obtaining topography (bathymetry) data in the intertidal zone of Asan Bay in the west coast of Korea from 26 satellite images. The method is expected to be very efficient in making bathymetry data base in the western and southern parts of Korea where tidal flats are well developed in wide regions.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2008년도 하계종합학술대회
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• pp.969-970
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• 2008

This paper proposes illumination-efficient iris image capturing method. face capture method for extraction of iris pattern with one high resolution camera needs a large scale near infrared illumination. we replace high-resolution camera with co-optic-axial combination between wide view camera and narrow view camera. because this method needs small scale illumination that illuminate only narrow camera viewing angle, we can capture iris pattern image with small scale near infrared illumination.

• 한국전기전자재료학회논문지
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• 제24권5호
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• pp.398-403
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• 2011

Recently, Near-infrared (NIR)colorant is intriguing and attractive but full of challenges. Although some cyanine colorant have been commercialized, near-infrared colorant with intensive NIR absorption, good chemical and photo-stability, and high solubility still remain as target compound. Certain polycyclic aromatic compounds such as quaterrylene represent a key class of NIR colorant and also give rise to outstanding physical and chemical properties after appropriate chemical modification. In this study, We have tried to introduceimide functional group to quaterrylene in order to give chemical and thermal stability. Finally, N,N'-bis (2,6-diisopropylphenyl)-quarterrylene-3,4:13,14-tetracarboximide was synthesized and evaluated its properties using $^1H$ NMR, Maldi-tof, TGA, and UV/VIS/NIR spectroscopy as NIR colorant. The quaterrylene bisimide compound exhibit a excellent thermal stability and chemical stability.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2012년도 제42회 동계 정기 학술대회 초록집
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• pp.127-127
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• 2012

We carried out the high-resolution dielectric mapping of graphenes on $SiO_2$/Si substrate, using the scattering Apertureless Near-Field Scanning Optical Microscopy (s-ANSOM) in both visible (633 nm) and infrared (3.6 um) wavelengths. In the visible wavelength, the dielectric contrasts are almost proportional to the number of the graphene layers, which indicates that the near-field interaction between the tip and individual graphene layers leads to an image charge oscillation in two-dimension. In the infrared region, on the other hand, we observe unique layer-specific contrasts that do not linearly increase with number of layers. It is attributed to the layer-dependent band- structure of graphenes.

• 방송공학회논문지
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• 제26권1호
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• pp.88-98
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• 2021

CCTV를 사용하여 저조도와 같은 열악한 환경에서도 범죄 예방 및 특정 대상을 정확히 확인하는 것이 최근 더욱 중요해지고 있다. 저조도 환경하의 CCTV 응용에서는 눈에 거슬리지 않는 근적외선 조명을 이용하여 영상을 획득하는데, 이 경우, 비록 사람 눈에는 어두운 저조도 환경이지만 근적외선 조명을 사용하기 때문에 영상의 상세 텍스처 정보를 얻을 수 있는 장점은 있지만, CCTV 영상내의 물체 판별이나 인물 확인을 위하여 매우 요긴한 정보인 색상 정보는 얻기 힘들다는 단점이 있다. 본 논문에서는 저조도 환경에서 근적외선 조명을 사용하여 얻은 CCTV 영상으로부터 DCGAN을 사용하여 색상정보를 획득하는 방법과 이때 재구성된 색상 영상에 생기는 색상 잡음을 제거하는 방법을 제시한다.

• 한국측량학회지
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• 제23권4호
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• pp.367-374
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• 2005

최근 들어 자주 발생하는 산림피해는 세계적으로 커다란 이슈가 되고 있으며, 그 중에서도 산불에 의한 피해는 그 자체로서의 피해뿐 만이 아니라, 홍수 등으로 이어지는 2차 피해로 연결이 된다. 또한 산불 등은 자연적인 원인보다는 사람에 의한 인위적인 재해가 많은 것도 주지의 사실이다. 본 연구에서는 위성영상 자료를 이용하기 위한 사전작업으로 근적외 CCD카메라와 분광반사계를 사용한 식생의 분광반사특성을 이용하여 산불의 피해 정도를 파악하고자 하였다. 즉 육안 관측에 의해 산림 피해도를 무(無), 중(中), 강(强)으로 구분하여 산림의 활성도를 평가하여 산림의 소생가능성을 파악하였다. 분광반사계와 근적외 CCD 카메라에 의한 분광 반사 특성간의 상관 관계를 구한 결과, 피해도 무(無), 중(中), 강(强)에서 높은 상관관계를 얻을 수 있었다. 따라서 산불피해 조사시 분광반사계와 근적외 CCD카메라를 병용하여 사용함으로서, 육안으로 관측하기 어려운 산불의 피해를 파악할 수 있었다.