• 조명전기설비학회논문지
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• 제26권10호
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• pp.16-26
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• 2012

This study conducted a subjective evaluation of brightness perception and visual discomfort according to dimming speeds and CCTs(Correlated Color Temperatures). Dimming speeds of two different CCT lights(2,700K, 6400K) were set to 1.7%/s, 3.3%/s, 5.0%/s, 6.7%/s, and 10.0%/s respectively. Subjects checked the time when they perceived the change of the brightness and visual discomfort. As a result, when dimming speeds were 1.7%/s, 3.3%/s, 5.0%/s, 6.7%/s, more than half of subjects responded the change of the brightness in 55.0~45.0% dimming ratios, and felt the visual discomfort in 35~25% dimming ratios. When the brightness was changed, dimming level responded to the brightness perception of hight CCT(6,400K) was higher about 8.0% then dimming level responded to the brightness perception of low CCT(2,700K). Dimming level responded to the visual discomfort of low CCT(2,700K) was higher about 5.0% then dimming level responded to the visual discomfort of hight CCT(6,400K).

• 한국인터넷방송통신학회논문지
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• 제21권4호
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• pp.31-36
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• 2021

색채 속성으로는 색상, 명도, 채도로 구분 지을 수 있으며 색채 속성 각각에 따라 색채를 인지하는 특성이 달라진다. 색채를 인지하는 데 있어서 한 가지 색채를 독립적으로 보는 것이 아니라 주변 색채를 함께 보게 되며 주변의 색채 특성에 따라 원본 색채 인지 특성은 달라질 수 있다. 선행된 색채 인지 및 감성 연구는 단일 색채를 대상으로 한 것이 대부분이며 이는 실생활에서 색채를 인지하는 것과는 차이가 있으므로 주변 색채를 고려한 색채 인지 기초 연구가 필요하다. 본 연구에서는 그래픽 영상에서 자주 사용되는 테두리 밝기에 따른 색채 인지 특성을 알아보고자 정신물리학 실험을 진행하고 이를 분석하였다. 밝기에 가장 민감한 시각적 특성을 기반으로 테두리 밝기를 변수로 설정하고 실험 자극색상으로는 먼셀 색채를 사용하여 실험을 진행하였다. 본 연구에서는 진행된 실험 결과를 분석하여 테두리 밝기에 따라 색채를 인지하는 시지각적 특성에 대한 기초 연구 자료로써 유의미 여부를 정의하고 향후 연구 방향을 제시한다.

• 조명전기설비학회논문지
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• 제27권12호
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• pp.44-53
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• 2013

This study has attempted to investigate how subjects perceive changes of brightness and their visual comfort according to daylight responsive LED(Light Emitting Diode) dimming systems in the office with venetian blind. Two studies was conducted. First study is that how subjects perceive changes of brightness and their visual comfort depending on angle control method of the venetian blind while the workplane illuminance level is being maintained through daylight responsive LED dimming system. Second study is that how subjects perceive changes of brightness and their visual comfort depending on the amount of daylight penetrated into the building while the illuminance level is being maintained through daylight responsive LED dimming system. The results of this study could be proposed as basic data in the control of the venetian blind and LED lighting in consideration of their perception on changes of brightness and visual comfort.

• 한국산업융합학회 논문집
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• 제1권2호
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• pp.55-64
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• 1998

This paper deals with the effects of fluorescent lamp description and luminance level on the occupant's brightness perception and other sensation in building interiors. The following experiments were conducted: the subjects compared on room lit by daylight fluorescent lamps with the other room lit by the different lamp description at equal luminance at equal luminance level. The degree of that effect decreased with a rise in luminace level. The brightness perception had high correlation with the visual clarity and no correlation with favorite sensation.

• 한국인터넷방송통신학회논문지
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• 제22권2호
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• pp.15-20
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• 2022

색채는 크게 세 가지 속성인 색상, 명도, 채도로 구성되어 있으나 색채를 시감적으로 인지하는데 있어서 각 속성을 구분하여 독립적으로 인지하지 않는다. 채도와 밝기 관련 기존 선행된 연구들은 채도 속성의 순도 정도에 따라 밝기 속성이 다르게 느껴진다는 결과를 유의미하게 얻을 수 있었으나 정신물리학적 실험 대부분이 감산 혼합을 활용한 사례이기에 디스플레이 기반의 색채 인지 기초 연구가 필요하다. 본 연구에서는 자체 발광 시스템을 보유한 디스플레이 기반에서 채도와 밝기 관련 시각적 특성을 알아보고자 정신물리학적 실험을 진행하고 이를 분석하였다. 가산 혼합 형태의 디스플레이에서 일정한 밝기를 선정한 후 주요 색상의 채도를 조정하여 실험을 진행하였다. 본 연구에서는 진행된 실험 결과를 분석하여 감산 혼합과 동일한 결과가 산출되는지 알아보고 색채 인지 특성에 대한 연구 자료로써 유의미 여부를 정의한 후 향후 연구방향을 제시한다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2003년도 하계종합학술대회 논문집 Ⅳ
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• pp.2403-2406
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• 2003

When viewing images, the relative luminance of the surround has a profound impact on the apparent contrast of the image. The dark surround causes the image elements to appear lighter than those viewed in an illuminated surround. For this reason, it is worthwhile to briefly review the general results of brightness sealing under a various viewing condition. Two of the most often cited parers on the topic of brightness scaling are Stevens-stevens and Bartleson-Breneman's function. There are, however, significant differences between the perceptual functions for simple-field and complex-field viewing. In this paper, we research the relationship between Steven's power law and Bartleson-Breneman's function. We present an appropriate brightness perception function due to TV system viewing conditions. Highlight luminance peak and absolute brightness threshold value in various adaptation levels are obtained from the proposed brightness function . Also, the luminance value of black level to produce the same contrast ratio with variety of display highlight luminance peak is obtained from the proposed brightness function.

• 인지과학
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• 제28권2호
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• pp.91-109
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• 2017

본 연구의 목적은 규칙적으로 반복되는 구조가 존재하는 자극 상황에서 양안시차와 T-교차가 White 착시 자극의 밝기 지각에 미치는 영향을 검증하는 것이다. 실험 1은 White 착시 자극을 변형한 Howe (2005)의 자극을 사용하여 양안시차와 단안정보인 T-교차 및 규칙적 구조 정보가 소속성에 대하여 불일치한 정보를 가질 때 대상의 밝기 지각이 주로 단안 정보에 의해 결정됨을 발견하였다. 실험 2는 규칙적 구조 정보와 양안시차만 포함하는 자극을 사용하여 T-교차가 존재하지 않을 때 두 정보 중 어느 하나가 주도적으로 밝기 지각을 결정하지 못함을 발견하였다. 본 연구의 실험 결과는 규칙적 구조와 양안시차가 대상의 소속성에 대하여 불일치한 정보를 제공할 때 T-교차가 대상의 소속성 결정에 중요한 정보로 이용되며 그에 따라 대상의 밝기 지각이 영향 받을 수 있음을 시사한다.

• 한국감성과학회:학술대회논문집
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• 한국감성과학회 1997년도 한국감성과학회 연차학술대회논문집
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• pp.140-145
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• 1997

A stuey to investigate the perception characteristics of color and brightness was conducted in a combined PC and TV monitor, The objective of this study is to suggest user's favorite color temperature in PC mode and user's favorite contrast in TV mode. Investigated factors were monitor coating(coatiog vs. non-coation)and screen brightness (30fL vs. 35fL)in first experiment and monitor coating and pucture movement(static vs. dynamic) in second experiment. The first experiment was conducted in TV mode. Twenty-three subjects (male 12, female 11) perticipated in this experiment. In first experiment, average color temperatures were about 8000K in all experimental conditions. In addition, there was significant difference between coating and non-coating screen at 0.1 level. In second experiment, average contrasts were obtained in all esperimental conditions. There was significant difference between coating and ndn-coating screen at 0.05 level, In addition, there was significant difference between static picture and dynamic picture at 0.1 level

• 대한가정학회지
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• 제48권5호
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• pp.17-24
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• 2010

Although design, color, and material are important elements in stage costumes, stage lightning also plays significant role in the presentation of stage costumes. Costumes color, material and perception can be significantly influenced by visual effects. Stage illumination can be arranged or managed so that colors are closely related to or enhanced or change the effects of costume colors on the runway or display at specific times. The results of this thesis are as follow; 1) Fabric tone, name, brightness, and chroma of colors were changed by the colors of stage lighting. 2) An achromatic color was changed to a chromatic color after being combined with colors of stage lighting. 3) Stage illuminations can make fabric, colors look similar to stage colors. 4) Plain satin silk fabric which reflects light shows high brightness and chroma after being influenced by stage lighting its shining effects and color changes were clear and apparent. 5) Velvet pile fabric which absorbs light shows low brightness and chroma after being influenced by stage lightning its shining effects and changes of colors were not clear and apparent. In conclusion, natural lights did not significantly influence fabric colors and perception, while artificial lights had wide range of effects on fabric colors and perception.

• 한국산업융합학회 논문집
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• 제15권3호
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• pp.87-94
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• 2012

Kruithof demonstrated the preferred combination of illuminance levels and color temperatures. However, as Benett pointed out, difference of themal variables in such preference may be expected. The purpose of this study is to clarify the combined effects of lighting conditions(illuminance, color temperature), operative temperature on the human physiological and psychological responses. In order to observe operative temperature change in preference of color temperatures for three illumination levels, three subjects were exposed to two different conditions of color temperatures of 2,850K, 4,200K and 6,850K combined with operative temperatures(OT) of $25{\sim}31^{\circ}C$ at 100~1000lx. Thermal sensation vote and comfortable sensation vote, brightness perception vote were reported in each experiment conditions. The following results were obtained : 1) When illuminace level was at 100lx in operative temperatures of OT $20^{\circ}C$, $25^{\circ}C$, $30^{\circ}C$, Color temperature affect not themal sensation but Warm-cool sensation. 2) Operative temperatures affect not brightness perception vote but visual comfort sensation vote, satisfactive sensation vote, warm-cool sensation vote and themal sensation vote.