• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2011.11a
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• pp.161-164
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• 2011

영상 매칭은 컴퓨터 비전에서 기초적인 기술로써 영상 추적, 물체인식 등 다양한 분양에서 많이 사용되고 있다. 하지만 스케일, 시점변화, 조명 변화에 강인한 매칭점을 찾는 것은 어려운 일이다. 이러한 문제점을 보완하기 위해 SURF(Scale Invariant Feature Transform), SIFT(Speed up Robust Features) 등의 알고리즘이 제안 되었지만, 여전히 조명변화에 불안정하고 정확하지 못한 성능을 보인다. 본 논문에서는 이러한 조명변화에 대한 문제점을 해결하기 위해 히스토그램 평활화를 이용하여 영상을 보정 후, SURF를 통한 영상 매칭을 하였다. 열악한 조명환경 내에서 촬영된 영상에서 SURF를 이용하여 표현자(Descriptor)를 생성 할 때 특징점이 잘 추출되지 않는 문제점을 해결하기 위하여 히스토그램 평활화를 이용하였고, 보정 후 특징점 개수가 많이 증가하는 것을 보여 확인하였다. 기존의 SURF와 개량된 SURF를 조명이 서로 다른 영상간의 매칭 성능을 비교함으로써 제안한 알고리즘의 우수성을 확인하였다

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2009.05a
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• pp.10-12
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• 2009

20C까지 단순히 밝혀주고, 점멸만 하는 조명형태가 21C부터는 밝기의 조정, 칼라의 조정이 병행된 감성조명의 시대로 도래하여, 주거생활 조명, 상업용 조명, 문화공간의 조명 둥에 본격적으로 도입되기 시작했다. 특히, LED 응용조명은 자동차 분야 및 PV분야 등 다양하게 활용되고 있으며, 연 4조원의 세계시장과 2,000억원의 국내시장으로 점유되고 있으며, 연평균 45% 성장 ($1995{\sim}2004$)으로, 성능은 향상되고, 가격은 년 $10{\sim}15%$로 인하되어 "미디어파사드"로 그 응용이 눈부시게 가속화 되는 실정이다. 조명기술의 눈부신 발전과 조명산업의 발전이 어우러진 가운데 조명 산업 현장에는 조명전문가의 소요가 급속히 발생되고 있는 반면에 실무형 조명전문가를 양성하는 교육기관과 프로그램이 턱없이 부족하여, 수요에 비하여 조명전문가 양성은 요원한 실정이다. 조명교육시스템을 구축하고, 실무형 조명전문가를 양성하고 있는 경북전문대학의 조명전문가 양성교육시스템을 참고로 하여, 보다 효율적인 단계별 중견조명 전문가의 양성에 대해 연구하여, 방향을 제시하고자 한다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.11 no.4
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• pp.223-229
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• 2011

In this study, two types of LED spot light with the development of the current broadcast studio-light is installed in the space being used in many products, companies in the UK Arri-650W, 1000W Fresnel spot light and illumination, color temperature and color rendering comparison of data measured compared with the target of the shooting and the color rendition on images was measured by comparing the color. In the future, broadcast - shooting LED spot light replacing whether the available studies on the performance evaluation were analyzed. Experimental evaluation of a replacement for halogen lights in LED Spot light is potential was confirmed.

• The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.20 no.2
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• pp.42-47
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• 2006

• The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.17 no.1
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• pp.13-19
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• 2003

• The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.25 no.2
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• pp.4-13
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• 2011

• Journal of Korea Multimedia Society
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• v.16 no.9
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• pp.1031-1043
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• 2013

Extracting hand region from images is the first part in the process to recognize hand posture and gesture interaction. Therefore, a good segmenting method is important because it determines the overall performance of hand recognition systems. Conventional hand segmentation researches were prone to changing illumination conditions or limited to the ability to detect multiple people. In this paper, we propose a robust technique based on the fusion of skin-color data and depth information for hand segmentation process. The proposed algorithm uses skin-color data to localize accurate seed location for region-growing from a complicated background. Based on the seed location, our algorithm adjusts each detected blob to fill up the hole region. A region-growing algorithm is applied to the adjusted blob boundary at the detected depth image to obtain a robust hand region against illumination effects. Also, the resulting hand region is used to train our skin-model adaptively which further reduces the effects of changing illumination. We conducted experiments to compare our results with conventional techniques which validates the robustness of the proposed algorithm and in addition we show our method works well even in a counter light condition.

• Journal of Convergence for Information Technology
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• v.8 no.6
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• pp.243-249
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• 2018

In this paper, we analyzed the effect of modulation scheme and modulation scheme on the dimming level of visible light communication system and studied the effect of distortion due to delayed signal. Currently, the modulation schemes most commonly used in visible light communication result in increasing the communication performance but reducing the brightness of the entire illumination. Continuous Burst Zero Duration will severely degrade lighting. This degrades not only the illumination but also the performance of the whole system and causes Flicker phenomenon. In this paper, we analyze the relationship between modulation technique and illumination - communication performance and investigate the effect of signal delay on visible light communication system. Through simulation, we analyze the performance of IPI-OOK which has the best communication-lighting performance and propose future research directions accordingly.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2004.11a
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• pp.137-140
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• 2004

광촉매의 성능을 평가하기 위해 3종류의 광촉매를 형광등 터널등기구, 고압나트륨 터널등기구, 고압나트륨 가로등기구에 코팅하고 이들 조명기구의 신설 시와 설치 1.5개월 후의 투과율을 측정하여 그 성능을 평가하였다. 그 결과 고압나트륨 터널등기구에는 광촉매 반응이 거의 일어나지 않았고, 형광등 터널등기구에서만 그 효과가 나타났다. 이것은 고압나트륨등이 자외선 영역에서 빛을 거의 방출하지 않았기 때문이다.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.23 no.12
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• pp.23-30
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• 2009

LEDs are increasingly used for many applications including automotive, aviation, display, transportation and special lighting applications. Generally, the RGB multichip LED luminaire applied to signboard, emotional lighting system and display device and the white LED luminaire applied to general lighting system. white LED spectra for general lighting should be designed for high luminous efficacy as well as good color rendering. This paper describes characteristics of LED luminaire white LED and RGB multichip LED. Two type of LED luminaire prototype used experiment physical, electrical and optic test and performance analyzed. RGB multi-chip and phosphor-type white LED luminaire were analyzed by experiment on their color characteristics and luminous efficacy of radiation, distribution curve, and electrical characteristics. Research work is in progress to develop an improved performance for optic and electrical works well for two type of LED luminaires.