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- 주제어 : Luminance contrast(휘도대비) (검색결과 4 건)
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이은진,윤문주,김수현,양계탁,정주현,김현정,김현일,최은정 한국안광학회 2012 한국안광학회지 Vol.17 No.4
목적: 명소시 상태에서 휘도의 감소에 따른 대비감도 변화에 대하여 조사하였다. 방법: FACT 시표를 이용하여 명소시 5단계의 휘도 하에서 63명의 대학생에 대한 대비감도를 조사하였다. 결과: 측정된 대비감도는 모두 정상범위내에 있었다. 40~10 cd/m^2에서 대비감도의 정점이 6 cpd에서 3 cpd로 이동하는 것으로 관측되었고, 6 cpd와 3 cpd 에 대한 가상적인 두 대비감도 직선들의 교점으로부터 정점은 약 25 cd/m^2일때 6 cpd에서 3 cpd로 이동하는 것으로 평가되었다. 휘도가 120 cd/m^2에서 10 cd/m^2으로 감소하는 동안, 6 cpd에서 대비감도 손실이 가장 컸지만, 1.5cpd에서의 대비감도는 큰 변화가 없었다. 근사적으로 평가된 25 cd/m^2 이상의 휘도에서 대비감도는 18<12<1.5<3<6 cpd의 순으로 높았지만, 25 cd/m^2이하의 휘도에서는 18<12<1.5<6<3 cpd의 순으로 높았다. 휘도의 감소에 따른 대비감도의 손실을 대비감도 감소량 및 감소율로도 평가하였다. 대비감도 감소량은 6 cpd에서 가장 컸지만, 감소율은 18 cpd에서 가장 컸다. 결론: 본 연구에서 활용된 평가법이 대비감도 변화를 평가하는 또 다른 방법으로 활용될 수 있음을 제안한다. Purpose: To investigate changes of contrast sensitivity with decreasing luminance in photopic conditions. Methods:Contrast sensitivities for 63 university students were investigated at 5 different luminance levels using FACT chart. Results: All contrast sensitivities measured were in the normal range. The peak of contrast sensitivity function was observed to move from 6 to 3 cpd between 40 and 10 cd/m^2. From an intersection point of two hypothetical lines related with contrast sensitivity for 6 and 3 cpd, we could evaluated that the peak moved from 6 to 3 cpd at about 25 cd/m^2. When luminance decreases from 120 to 10 cd/m^2, contrast sensitivity loss at 6 cpd was most,while contrast sensitivity at 1.5 cpd changed little. We could evaluate that at luminance of more than 25 cd/m^2evaluated approximately, contrast sensitivity was high in the following order of spatial frequency: 18<12<1.5<3<6 cpd, while at luminance of less than about 25 cd/m^2 as follows: 18<12<1.5<6<3 cpd. Contrast sensitivity losses with decreasing luminance were also evaluated using the decrements and decrement rates of contrast sensitivity. The decrement of contrast sensitivity was the greatest at 6 cpd, while the decrement rate was the greatest at 8 cpd. Conclusions: We propose that evaluation methods used in this research may be available as another methods to evaluate the changes of contrast sensitivity.
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신분증 OCR 인식 확률을 높일 수 있는 인공조명환경 연구
박범진,조대기,김승민,김지헌,신준우 한국과학영재교육학회 2024 과학영재교육 Vol.16 No.1
신분증 OCR(Optical Character Recognition)은 사용처가 많아지고 그 활용의 범위도 높아지고 있는 반면 외부 조건을 통제 하지 못하는 문제점으로 인해 확률을 높이는데 제한점을 가지고 있다. 현재 안내되는 피드백은 과학적이지 못해 사용자들에게 적절한 안내를 못하는 상황이다. 본 연구는 OCR이 잘 안되는 주된 원인인 베일링 반사를 피할 수 있는 수식을 제작하여 신분증과 카메라 사이의 거리에 따라 조명과의 각도를 조절할 수 있도록 하였다. 또한 신분증의 BRDF(Bidirectional Reflectance Distribution Function)를 측정하여 시뮬레이션 하였고, 색깔의 휘도대비가 가장 큰 곳인 지점을 조명과 신분증 사이의 각도 36도로 제시하였으며, 이를 실제 상황에서 검증하였다. 이를 통해 인공 조명환경에서 OCR 잘될 수 있는 지점을 과학적인 방법으로 제시하였으며, 머신러닝을 추가적으로 진행하여 사용자들이 편리하게 OCR확률이 높은 곳을 찾을 수 있는 방안을 마련하였다. While the number of uses for ID(Identification) OCR(Optical Character Recognition) is increasing and the scope of its use is increasing, it has limitations in increasing the probability due to the problem of not being able to controlexternal conditions. The feedback currently being provided is not scientific, so it is unable to provide appropriate guidance to users. This study created a formula to avoid veiling reflection, which is the main cause of poor OCR, and allowed the angle of lighting to be adjusted according to the distance between the ID card and the camera. In addition, the BRDF(Bidirectional Reflectance Distribution Function) of the ID card was measured and simulated, and the point where the color luminance contrast was greatest was presented at an angle of 36 degrees between the light and the ID card, and this was verified in an actual situation. Through this, points where OCR can be good in an artificial lighting environment were presented in a scientific way, and machine learning was additionally conducted to provide a way for users to conveniently find places with a high OCR probability.
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안개, 강우의 기후변화에 반응하는 백색 색온도 가변전조등에 관한 연구
김학봉(Hakbong Kim),전병철(Byongcheol),강호준(Hojoon Kang) 한국자동차공학회 2020 한국자동차공학회 학술대회 및 전시회 Vol.2020 No.11
According to the analysis of traffic accidents, it is necessary to make a plan to reduce the traffic accident rate in bad weather. Depending on the weather conditions that affect driver’s visual range, traffic accident rate varies. Accordingly, a study is researching on the color temperature of the vehicle’s headlights to improve visibility for driver safety. In this paper. an integrated headlamp system is proposed that changes lighting between Cool white and Warm white for stable visibility. The algorithm for climate condition analysis makes scheme, and the information required for driving is acquired via sensor in vehicle. After analyzing a database of acquired information, it was linked to a color temperature variable headlamp system. A virtual environment has been established and simulated to demonstrate increasing Contrast for luminance, as a result. traffic accidents can be expected to be reduced as increasing the driver visibility range.
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차량용 HUD의 인지적 감성 평가 -주행정보의 색채 시인성을 중심으로-
최원정 ( Won Jung Choi ),이혜미 ( Won Jung Lee ),이설희 ( Seol Hee Lee ),박영경 ( Yung Kyung Park ) 한국감성과학회 2013 감성과학 Vol.16 No.2
The main causes of traffic accidents while driving a car is of the driver`s visual distraction. In this study, the color sensitivity of the information projected on the windshield were evaluated for HUD (Head Up Display) system which helps the driver`s eyes on the road while driving. The driving Information were projected 9˚ downward from front sight 0˚ under lab`s fluorescent lights, LED floorlights and the TV had having 25 [lux] illumination when driving at night environment and 100,000 [lux] of daylight environment. Munsell color hue of the basic five colors (R, Y, G, B, P) and the color of traffic lights YR, W were the color of the seven characters, each character were outlined by White, Gray except for W. Total of 19 experimental stimuli was shown in the environment of day and night driving for asking visibility information of color, fatigue, preferences, and evaluate the degree of interference. The results came out that the bright Y and G color is visibility significantly for daylight. Second, with the outline of the text, the color of the outline works as a background for luminance contrast effects and affects visibility. Third, without the outline, the glass in front of the vehicle acts as the background and the luminance contrast of characters achieve greater brightness and visibility. The luminance contrast between the stimuli and background should be considered for increasing color visibility for driving information which is an important factor for HUD commercialization.
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