• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2008년도 하계종합학술대회
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• pp.737-738
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• 2008

An implementation of robust stereo matching algorithm under variable illumination conditions is presented in this paper. By applying window-based matchingmethod to global stereo matching algorthm using belief propagation, our implemented system shows low error rate and could efficiently cope with general radiometric disimilarities between images acquired from two different point of views.

• 한국조경학회지
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• 제29권1호
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• pp.92-99
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• 2001

This study analyzed the effects of illumination on psychological accessibility from a view of satisfaction of night use at urban neighborhood park for actual night users. For this, we have classified the effects of illumination as five sampled independent variables from 12 effects of illumination, and tested the relationship with satisfaction of night use of a dependent variable by multiple regression analysis. The results of this study are as follows; 1) The effects of illumination for night use at urban neighborhood park were divided into five factors; (1) direct effect, (2) effect of promoting use, (3) effect of ensuring security, (4) effect of preparing landscape in the night time, and (5) psychological effect. Among independent variables indicating characteristics of effects of each illumination, uneasiness at night use was high. 2) In a multiple regression model, when other conditions were not changed, the value of security of night use (X\ulcorner) had maximumly an affect on the value of dependent. And, the value of danger to meet the depraved(X\ulcorner) had minimally an affect on the value of dependent variable. 3) For the contribution of security of nigh use(X\ulcorner) and brightness of present using space(X$_4$) to satisfaction of night use(Y) of dependent variable, they had a nearly equal effect on that, and showed about 2 times importance compared to familiarity with park(X\ulcorner) and the beauty of park(X\ulcorner). Also, they showed about 7 times contribution to satisfaction of night use compared to danger to meet the depraved(X\ulcorner), which had minimally an affect on the value of dependent variable, as the most important variables. 4) For the effects of illumination on satisfaction of night use, the effect of ensuring security - pursues security of park for the general rather than security for the specific class or subject - and direct effect to offer proper brightness in using space relatively affected on it much compared to psychological effect, effect of preparing landscape in night time, and effect of promoting use. A research on the psychological effects among the variables related to illumination as well as physical circumstances such as the height, location, direction of illumination should be studied.

• 한국조경학회지
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• 제37권3호
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• pp.113-124
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• 2009

본 연구는 교보생명빌딩 그린하우스를 대상으로 광조건에 따른 수목피해 및 생육상태 영향을 조사 분석하여 실내식물의 적절한 생육환경을 유지할 수 있는 적정 조도기준 도출을 목적으로 하였다. 광조건에 따른 조도현황과 고사목 교체주수, 수목피해율을 분석하여 생육조건에 따른 문제점을 파악하고 적정 조도기준을 도출하였다. 조도조사 결과 남측 음지와 양지에서 각각 531lux, 602lux로 가장 낮은 차이를 보인 반면에, 중앙 음지와 양지에서 210lux, 782lux로 약 500lux의 가장 높은 차이가 발생하였다. $1990{\sim}2004$년간 수목고사 조사결과 식재된 수목 중 아왜나무가 161주로 교체율이 가장 높았으며, 대나무 69주, 동백나무 40주, 후피향나무 40주 등의 순으로 조사되었다. 수목피해도 결과는 수종에 관계없이 채광이 양호한 양지구역에서는 평균 수목피해율이 $4.4{\sim}6.4%$로 경미하였으며, 음지구역에서는 수목피해율이 $21.9{\sim}48.8%$로 심각한 피해현상이 나타났다. 조도를 독립변수로, 수목피해도를 종속변수로 상관분석과 회귀분석을 각각 실시한 결과, 조도가 낮아질수록 수목피해율은 증가하였다. 조도가 $500{\sim}600lux$ 사이에서 피해율이 급격히 감소하였으며, 700lux 수준에서 피해율이 최소화되었다. 따라서 실내식물의 광조건에 의한 피해율을 줄이기 위해서는 최소 700lux이상의 조도가 필요한 것으로 판단되었다.

• International journal of advanced smart convergence
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• 제6권4호
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• pp.88-95
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• 2017

The conventional scan methods are based on a laser scanner and a depth camera, which requires high cost and complicated post-processing. Whereas in photometric scanning method, the 3D modeling data is acquired through multi-view images. This is advantageous compared to the other methods. The quality of a photometric 3D model depends on the environmental conditions or the object characteristics, but the quality is lower as compared to other methods. Therefore, various methods for improving the quality of photometric scanning are being studied. In this paper, we aim to investigate the effect of illumination conditions on the quality of photometric scanning data. To do this, 'Moai' statue is 3D printed with a size of $600(H){\times}1,000(V){\times}600(D)$. The printed object is photographed under the hard light and soft light environments. We obtained the modeling data by photometric scanning method and compared it with the ground truth of 'Moai'. The 'Point-to-Point' method used to analyseanalyze the modeling data using open source tool 'CloudCompare'. As a result of comparison, it is confirmed that the standard deviation value of the 3D model generated under the soft light is 0.090686 and the standard deviation value of the 3D model generated under the hard light is 0.039954. This proves that the higher quality 3D modeling data can be obtained in a hard light environment. The results of this paper are expected to be applied for the acquisition of high-quality data.

• 한국조경학회지
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• 제29권4호
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• pp.44-52
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• 2001

This study performed factor analysis for 21 independent variables related to the effect of illumination and suggested the effect by multiple regression analysis on the relationship between the effect of illumination and the satisfaction of use of a dependent variable to find the effect of illumination in urban parks at night and the effect of illumination on the satisfaction of use. The results of this study are as follows; 1) Of the 21 independent variables used to study the effect of illumination in urban parks at night, the impact on safety and possibility of crime was highly. The effects of illumination by factor analysis were abstracted as effects of removing anxiety, securing safety, increasing use. 2) As a result of multiple regression analysis, independent variables influencing satisfaction of use in urban park were proved as effects of removing anxiety, securing safety, increasing identity, preparing atmosphere and increasing use. Also, the effect of securing safety was the most important factor; it showed a level of importance 2 times higher than the effect of removing anxiety, and 7.7 times higher than the effect of preparing atmosphere in relative contribution of the effect of illumination to satisfaction of use. 3) Of the effects of illumination influencing satisfaction of use in urban parks, the effect of securing safety and the effect of increasing visibility were more significant than the effects of removing anxiety, preparing atmosphere and increasing use. This fact means that personal safety an the identity of persons or facilities in the space of use should be considered with priority in planning or designing illumination. Also, it implies hat, for night use in urban parks, lightness of the space is required for general safety of use at parks, and proper illuminance on the activity in the space of use should be required. The subject parks of this study are 8 urban neighborhood parks. The model on the effect of illumination and the satisfaction of use depends on characteristics and conditions of location of he park and user class, so the subject parks and persons should be varied, and the difference by sex or ages should be suggested.

• 전자공학회논문지CI
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• 제46권2호
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• pp.19-26
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• 2009

본 논문은 PCA기반 얼굴인식 알고리즘에서 조명 변화에 따른 인식율의 변화 및 Cumulative Match Characteristic을 이용한 누적 식별 값 측정을 통해 알고리즘의 신뢰도를 확인하였다. 이를 위해 본 논문에서는 한 사람당 하나의 학습 영상만을 사용하는 경우뿐만 아니라 조명 조건이 다른 다중 학습 영상을 사용하여 실험하였고, 입력 영상 또한 다양한 조명 조건의 영상을 사용함으로서 학습 영상의 선택과 입력 영상의 조명 변화에 따른 알고리즘의 신뢰도에 관해 연구하였다. 실험 결과, 한사람 당 하나의 정면조명조건 학습 영상을 사용한 방식에 비하여 다중 학습 영상 사용 시 인식율은 떨어졌다. 그러나 학습 영상의 개수와 입력 영상의 조명 변화 범위에 관계없이 상위 유사도군에 들어가는 비율은 높은 양상을 보임으로서 조명 변화 환경에서 PCA 알고리즘의 인식 결과에 대한 신뢰도를 확인 할 수 있었다.

• 한국ITS학회 논문지
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• 제17권5호
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• pp.65-76
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• 2018

본 연구에서는 안개발생시 가변형 속도제한표지의 크기와 휘도에 따른 판독거리의 변화에 관한 현장실험을 실시하여 결과를 제시하였다. 이를 위하여 안개상황 모의 환경을 구축하였고, 속도제한표지의 밝기와 크기를 변동하면서 피실험자 실험을 수행하여 시정거리에 따른 판독 거리를 분석하였다. 분석 결과, 주어진 휘도에서 시정거리별 판독거리는 표지의 크기에 따라 증가하지만, 완벽한 선형적인 관계는 나타나지 않았다. 그리고 짙은 안개 상황일수록 크기가 큰 가변형 속도제한표지가 효과적인 것으로 파악되었다. 그리고 가변형 속도제한표지의 운영 휘도를 증가할수록 판독거리가 증가하는 경향을 나타내었다.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1995년도 춘계학술대회 논문집
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• pp.371-376
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• 1995

Computer vision is applicated to measure the position and orientation of the SMD on 8mm Camcoder PCB and advanced image processing algorithms for high accuracy and real time processing are proposed. Illumination conditions are optimized for the best image formation and a set of LEDs is used as economic illuminator, which is regarded as a summation of many point sources. Conctete optical system is constructed and the performance of the proposed algorithm is verified by several experiments.

• 한국산학기술학회논문지
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• 제21권4호
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• pp.518-524
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• 2020

본 연구에서는 수학영역, 언어영역 및 창의영역에서 학습효과 증진을 위한 교육용 조명체험실의 조명설계를 위한 기초연구를 진행하였다. 조명환경을 직접 체험할 수 있는 공간 내부는 실험자가 자연스럽게 공부할 수 있는 환경으로 설계하였고, 실험 진행 중 설정조명 외의 다른 색의 영향을 최대한 받지 않도록 외부의 빛은 완벽히 차단하였다. LED조명의 색온도와 조도를 변화시키면서 동일한 방식으로 조명변화에 따른 뇌파의 변화를 분석하였다. 이때 사용되어진 뇌파 분석기는 EMOTIV사(社)를 활용하였다. 가변 RGB LED조명에서 색을 변화시키며 상황별에 따른 실험자의 뇌파를 측정하고, 가변 색온도 LED조명에서는 색온도(3000[K], 4500[K]. 6000[K])와 빛의 세기(50%-250[lux], 70%-350[lux], 100%-500[lux])의 값을 변화시키며 상황별에 따른 실험자의 뇌파를 측정하였다. 그결과, 수리영역의 경우 색온도가 높은 경우가 집중도가 좋은 결과를 보였고 6000[K]의 색온도와 350[lux]의 조도인 조명환경에서 집중도가 가장 높은 결과를 얻었다. 언어영역의 경우 4500[K]의 색온도와 500[lux]조도일때 최적조건이고 창의영역의 경우 3000[K]의 색온도와 500[lux]의 조도일 때 최적 조명환경 조건을 얻었다. 감성조명이 가능한 LED조명원을 활용하는 경우 얻어진 색온도와 조도를 기준하여 조명 환경을 설계한다면 언어, 수리, 창의학습시 집중도가 높아짐을 알았다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2004년도 학술대회지
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• pp.862-866
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• 2004

Non-intrusive methods based on active remote IR illumination for eye tracking is important for many applications of vision-based man-machine interaction. One problem that has plagued those methods is their sensitivity to lighting condition change. This tends to significantly limit their scope of application. In this paper, we present a new real-time eye detection and tracking methodology that works under variable and realistic lighting conditions. Based on combining the bright-pupil effect resulted from IR light and the conventional appearance-based object recognition technique, our method can robustly track eyes when the pupils are not very bright due to significant external illumination interferences. The appearance model is incorporated in both eyes detection and tracking via the use of support vector machine and the mean shift tracking. Additional improvement is achieved from modifying the image acquisition apparatus including the illuminator and the camera.