• The Optical Journal
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• s.119
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• pp.35-37
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• 2009

지난 수년 간 국내 광학산업은 눈부신 발전을 했다. 디지털카메라, 핸드폰카메라, 정보저장기기, 복사기와 같은 전자제품 시장의 성장, 평판디스플레이의 도약, LED 조명의 출현, 매 순간이 숨 가쁜 변화와 팽창의 연속이었다. 작년에 시작된 미국발 금융위기가 전 세계 신용경색, 실물경제 침체로 이어지면서 국내 광학산업에 먹구름이 드리워지고 위기감이 고조되고 있다. 본 원고는 해외 광학회사, 연구기관들과 협력하면서 고찰한 내용에 필자의 의견을 덧붙인 것이다. 이제는 국내회사들이 지속적으로 성장하기 위해서 세계 시장을 대상으로 '그레이트 게임'을 할 시기이다.

• The Optical Journal
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• s.135
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• pp.35-37
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• 2011

국내 재제조 산업은 대부분 자동차부품, 토너 카트리지 등에 집중되어 있으며, 소규모 영세업체가 상당한 비중을 차지하고 있다. 판매되는 재제조 부품의 반품회수율(불량률)은 5~10% 정도이나, 재제조 기술 수준은 미국, 유럽 등 선진국의 30% 정도로 평가된다. 최근에는 규모는 크지 않지만 컴퓨터, 카메라, 가전 등 전자제품 분야에서도 재제조 시장이 형성되고 있다. 우리나라 재제조 산업은 대상 부문 및 시장 규모 등에서 미국에 비해 매우 초보적인 단계에 있지만, 재제조 산업이 갖는 경제적 환경적 가치를 고려하여 관련 산업의 활성화 방안을 모색할 때이다. 본 고는 한국산업연구원에서 7월 5일에 발표한 보고서 내용을 발췌 정리한 것이다.

• The Optical Journal
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• s.96
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• pp.49-54
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• 2005

프로젝션 TV, 비디오 카메라나 CD 등과 같은 전자 광학((Electro-optics) 제품 시장이 확대되고 있다. 이들 제품의 광학 부품을 소형경량화·고성능화·저가격화 하기 위해 각 제조업체에서 독자적인 비구면 가공 기술을 개발하고 있으며, 종전의 유리 렌즈에서 좀더 가벼운 플라스틱 렌즈로 이동하고 있다. 이 광학 부품들의 요구 정밀도는 형상 정밀도, 면 거칠기 모두 요구값이 높아지고 있으며 초정밀 비구면 경면 절삭 기술이 이용되고 있다. 본 고에서는 프로젝션 TV 및 비디오 카메라의 비구면 플라스틱용 금형을 대상으로 무전해 니켈 도금막의 초정밀 경면 절삭 기술에 대해 소개한다.

• Korean Journal of Remote Sensing
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• v.14 no.3
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• pp.213-222
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• 1998

Electro-Optical Camera(EOC) is the main payload of the KOrea Multi-Purpose SATellite(KOMPSAT) with the mission of cartography to build up a digital map of Korean territory including a Digital Terrain Elevation Map(DTEM). This instalment which comprises EOC Sensor Assembly and EOC Electronics Assembly produces the panchromatic images of 6.6 m GSD with a swath wider than 17 km by push-broom scanning and spacecraft body pointing in a visible range of wavelength, 510~730 nm. The high resolution panchromatic image is to be collected for 2 minutes during 98 minutes of orbit cycle covering about 800 km along ground track, over the mission lifetime of 3 years with the functions of programmable gain/offset and on-board image data storage. The image of 8 bit digitization, which is collected by a full reflective type F8.3 triplet without obscuration, is to be transmitted to Ground Station at a rate less than 25 Mbps. EOC was elaborated to have the performance which meets or surpasses its requirements of design phase. The spectral response, the modulation transfer function, and the uniformity of all the 2592 pixel of CCD of EOC are illustrated as they were measured for the convenience of end-user. The spectral response was measured with respect to each gain setup of EOC and this is expected to give the capability of generating more accurate panchromatic image to the users of EOC data. The modulation transfer function of EOC was measured as greater than 16 % at Nyquist frequency over the entire field of view, which exceeds its requirement of larger than 10 %. The uniformity that shows the relative response of each pixel of CCD was measured at every pixel of the Focal Plane Array of EOC and is illustrated for the data processing.

• The Optical Journal
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• v.13 no.5 s.75
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• pp.90-91
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• 2001

• Korean Journal of Remote Sensing
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• v.34 no.2_1
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• pp.227-236
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• 2018

The focus control mechanism of the multi-purpose camera can be required for the better quality image acquisition. A good image acquisition through the hardware system including the optics and image sensor, has to be processed before the post correction for improvement of image quality. In the case of the high-resolution satellite camera, the focus control is not a necessity, unlike a normal camera due to a fixed optical system, but may be required due to various reasons. Although there is a basic focus control method using a motor for satellite electronic optical camera, a focus control method using thermal control can be a good alternative because of its various advantages in design, installation, operation, contamination, high reliability and etc. In this paper, we describe the design method and implementation results for the focus control mechanism using the temperature sensor and heater installed in the telescope structure. In the proposed focus control method, the measured temperature information is converted into temperature data by the Kalman filter and the converted temperature data are used in PI controller for the thermal focus control.

• Journal of the Institute of Electronics and Information Engineers
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• v.49 no.11
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• pp.74-85
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• 2012

In this paper, we propose a optical property correction technique for a low-cost heterogeneous stereoscopic camera. Three main optical properties of a stereoscopic camera are zoom, focus, and DOF(depth of field). The difference or mis-match of these properties between two stereoscopic videos are the main causes of the visual fatigue to human eyes. The proposed correction technique reduces the difference of the optical properties between the stereoscopic videos and produces high-quality stereoscopic videos. To correct the zoom difference, a LUT(look-up table) is established to match the zoom ratio between the stereoscopic videos. To correct the DOF difference, the magnitude of image edge is measured and the lens iris is changed to control the DOF of the camera. A vertical-type stereoscopic rig is developed for the experiments of the optical property correction. Based on the experimental results, we find that a low-cost heterogeneous stereoscopic camera can be implemented, which can yield low visual fatigue to human eyes.

• Journal of IKEEE
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• v.26 no.3
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• pp.430-436
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• 2022

In this paper, we propose an intelligent camera for multiple body temperature detection. The proposed camera is composed of optical(4056*3040) and thermal(640*480), which detects abnormal symptoms by analyzing a person's facial expression and body temperature from the acquired image. The optical and thermal imaging cameras are operated simultaneously and detect an object in the optical image, in which the facial region and expression analysis are calculated from the object. Additionally, the calculated coordinate values from the optical image facial region are applied to the thermal image, also the maximum temperature is measured from the region and displayed on the screen. Abnormal symptom detection is determined by using the analyzed three facial expressions(neutral, happy, sadness) and body temperature values. In order to evaluate the performance of the proposed camera, the optical image processing part is tested on Caltech, WIDER FACE, and CK+ datasets for three algorithms(object detection, facial region detection, and expression analysis). Experimental results have shown 91%, 91%, and 84% accuracy scores each.

• Bulletin of the Korean Space Science Society
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• 2003.10a
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• pp.99-99
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• 2003

우리나라 최초의 실용급 지구관측위성인 아리랑 1호는 지난 2003년 2월 21일부로 목표로 하였던 임무운영기간 3년을 완수하였다. 아리랑 1호의 정상 임무운영에 사용되는 탑재체는 전장광학카메라, 해양관측카메라, 그리고 우주과학 탑재체이며, 2001년 8월 원인을 알 수 없는 과전류 발생으로 임무가 중단된 우주과학 탑재체를 .제외한 나머지 탑재체들은 임무 운영기간동안 정상적으로 운영되었다. 전자광학카메라는 한반도를 비롯한 전 세계를 대상으로 지리정보를 위한 영상자료를 획득하는 것이 목적이었으며, 해양관측카메라는 생물학적 해양지도 및 해양환경 관측을 위한 자료를 획득하는 것이다. 우주과학 탑재체는 고에너지 전하입자에 의한 Single Event Upset현상, 우주방사능 관측, 그리고 전자의 온도 및 밀도 측정이 주요 목표였다. 당초 목표했던 임무운영기간을 초과한 현재(2003년 7월 1일 기준)까지 우주과학 탑재체를 제외한 나머지 탑재체들은 정상적으로 운영되고 있다. 본 논문은 아리랑 1호 발사 후 약 3년 6개월간의 기간동안 수행된 탑재체 운영결과들을 정리하였다.

• Aerospace Engineering and Technology
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• v.1 no.1
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• pp.177-187
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• 2002

Some kinds of precision optical systems for spaceborne high resolution cameras were designed at preliminary design level and an optical design for a hyperspectral imager was performed for its development model. A Cassegrain-based catadioptric system and an unobscured reflective triplet system are illustrated in detail for spaceborne high resolution electro optical cameras which have performance of 5m resolution at an altitude of 685km and the design are evaluated in its spot-diagram and MTF to prove they have good performance enough to implement the requirements for realistic satellite payload taking the fabrication conditions and the on-orbit operation into consideration. For the development of hyperspectral imager as a next-generation payload, an optical system has been designed and elaborated. It can be divided into two parts, a catoptric telescope forming an off-axis 2 mirror type and a dispersive spectrometer which comprises collimator, grating and reimaging lens cell. From its optical design to the system characteristics are shown with the MTF performance reaching 25% approximately.