• 제목/요약/키워드: Lighting and Rendering

검색결과 110건 처리시간 0.033초

Study on full color RGB LED source lighting for general lighting and Improvement of CRI (Color Rendering Index)

  • Park, Yung-Kyung
    • 감성과학
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    • 제15권3호
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    • pp.381-388
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    • 2012
  • The purpose of this study is to check if LED lighting can be used as general lighting and examine the color rendering property of full color RGB LED lighting. CRI is one of the important properties of evaluating lighting. However the present CRI does not fully evaluate LED lightings. Firstly, the performance of a simple task was compared other than comparing CRI values for different lighting. For experimental preparation three types of lightings were used; standard D65 fluorescent tube, general household fluorescent tube, and RGB LED lighting. All three lightings show high error for Purple-Red. All three lightings show similar error for all hues and prove that color discrimination is not affected by the lighting. This proves that LED could be used as general lighting. Secondly, problems of the conventional CIE CRI method are considered and new models are suggested for the new lighting source. Each of the models was evaluated with visual experiment results obtained by the white light matching experiment. The suggested model is based on the CIE CRI method but replaces the color space model by CIELAB, color difference model by CIEDE2000, and chromatic adaptation model by CAT02.

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상업공간에서의 사용자 선호 LED 조명 연색지수와 상관색온도, 조도의 분석 (Analysis of User Preference about the Color Rendering Index, Correlated Color Temperature and Illuminance of LED Lighting in Merchandising Spaces)

  • 이수정;윤혜경
    • 대한건축학회논문집:계획계
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    • 제35권1호
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    • pp.99-106
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    • 2019
  • This study aims to recommend the proper Color rendering index (CRI), the Correlated Color Temperature (CCT), and illuminance levels of Light-Emitting Diode (LED) lighting based on the analysis of the criteria of the current CRI, the CCT, and illuminance levels in merchandising spaces with LED lighting conditions. It would be a basic material to apply in line with user preference for LED merchandising lighting. To this end, it examines relevant literature review on the experiments designed to test whether lighting characteristics affect brightness perception, color appearance, and pleasantness. Highly saturated colors appear brighter than low saturated colors. Two lighting applications - grocery and clothing shop - were created in elaborating the effect of LED lighting characteristics of CRI on color appearance and the CCT and illuminance on pleasantness. The findings show that the criteria of CIE Ra<80 are appropriate to provide better color appearance of illuminated products in terms of LED lighting that can enhance color saturation, particularly for the red color. Furthermore, 2700 K and less than 500 lux for grocery, 4000 K and more than 500 lux for clothing shop are found to be the proper the CCT and illuminance levels respectively to bring better preference under LED lighting.

증착법을 이용한 퇴색파장 차단 필터 및 램프에 관한 연구 (A Study on Filter and Lamp of Blocking Fading Wavelength with Use of the Deposition)

  • 임종민;이진우
    • 조명전기설비학회논문지
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    • 제24권12호
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    • pp.47-56
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    • 2010
  • For a human being's smooth activity, the clean air and comfortable lighting environment are needed. The suitable lighting environment is obtained generally by making it available for being formed the bright situation easy for seeing object and the visually comfortable atmosphere. In this way, even the lighting environment was changed along with economic development. Even a light source was diversified. Thus, several kinds of new light sources such as LED, OLED, PLS, and CNT came to appear. Halogen lamp, which has low efficiency due to high color rendering among lamps of being used now, is being much used yet. However, owing to radiation of UV and IR, there are many limitations to the subject in general exhibition lighting, museum, and art museum. Accordingly, a research was performed on filter that is blocked UV and IR at the same time, by using halogen lamp that is excellent in color rendering and in life.

Improving CRI and Scotopic-to-Photopic Ratio Simultaneously by Spectral Combinations of CCT-tunable LED Lighting Composed of Multi-chip LEDs

  • Kim, Jong-Oh;Jo, Hyeong-Seob;Ryu, Uh-Chan
    • Current Optics and Photonics
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    • 제4권3호
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    • pp.247-252
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    • 2020
  • Important determinants for selecting outdoor lighting are the color-rendering index (CRI) and scotopic-to-photopic (S/P) ratio of the lighting units. The higher the S/P ratio, the better energy savings and visual performance. In this study, CCT-tunable LED lighting units were optimized and fabricated by spectral combination of red, green, blue, and yellow LEDs. The measured results for RGB LEDs provided S/P ratios of 1.55~2.58 and those of RGBY LEDs gave 1.46~2.46 to the correlated color temperatures (CCTs) ranging from 2700 K to 6500 K, with CRI values of over 80 at the same time.

플라스틱 광섬유를 이용한 조명시스템 개발과 특성 분석 (Development and Performance Property Investigation of Lighting System using Plastic Optical Fiber)

  • 신상욱;이진우
    • 조명전기설비학회논문지
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    • 제24권12호
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    • pp.25-32
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    • 2010
  • Compared to general lighting method, the lighting system that uses optic fiber can provide only the visible light of good quality to subject by eliminating ultraviolet ray and infrared ray. Thanks to this merit, it is possible to prevent the hard phenomenon of subject caused by ultraviolet ray and infrared ray and to provide the agreeable light environment. This study developed indoors illumination system of high color rendering on the basis of plastic optic fiber with excellent optical property and processing to substitute halogen lamp which has been used for excellent color rendering in spite of low efficiency and short life. Producing pilot product of the designed illumination system and evaluating the property of electric and optical property, ultraviolet ray radiation quantity and temperature property, this study verified the excellence of suggested lighting system of plastic optic fiber.

Image-Based Relighting - Luminance Mapping Based on Lighting Functions

  • Manabe, Tomohisa;Raytchev, Bisser;Tamaki, Toru;Kaneda, Kazufumi
    • International Journal of CAD/CAM
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    • 제12권1호
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    • pp.38-47
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    • 2012
  • The paper proposes a method for generating a sequence of images with smooth transition of illumination from two input images with different lighting conditions. Our relighting approach is image-based, such as the light field rendering. We store the luminances (pixel RGB values) into "lighting functions" consisting of a couple of parameters related to normal vectors. Images with different light positions are rendered by interpolating the luminances retrieved from the lighting functions. The proposed method is a promising technique for many applications requiring a scene with variety of lighting effects, such as movies, TV games, and so on.

Bi-layers Red-emitting Sr2Si5N8:Eu2+ Phosphor and Yellow-emitting YAG:Ce Phosphor: A New Approach for Improving the Color Rendering Index of the Remote Phosphor Packaging WLEDs

  • Nhan, Nguyen Huu Khanh;Minh, Tran Hoang Quang;Nguyen, Tan N.;Voznak, Miroslav
    • Current Optics and Photonics
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    • 제1권6호
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    • pp.613-617
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    • 2017
  • Due to optimal advances such as chromatic performance, durability, low power consumption, high efficiency, long-lifetime, and excellent environmental friendliness, white LEDs (WLEDs) are widely used in vehicle front lighting, backlighting, decorative lighting, street lighting, and even general lighting. In this paper, the remote packaging WLEDs (RP-WLEDs) with bi-layer red-emitting $Sr_2Si_5N_8:Eu^{2+}$ and yellow-emitting YAG:Ce phosphor was proposed and investigated. The simulation results based on the MATLAB software and the commercial software Light Tools indicated that the color rendering index (CRI) of bi-layer phosphor RP-WLEDs had a significant increase. The CRI had a considerable increase from 72 to 94. In conclusion, the results showed that bi-layer red-emitting $Sr_2Si_5N_8:Eu^{2+}$ and yellow-emitting YAG:Ce phosphor could be a prospective approach for manufacturing RP-WLEDs with enhanced optical properties.

Simulation and Comparison of the Lighting Efficiency for Household Illumination with LEDs and Fluorescent Lamps

  • Sun, Wen-Shing;Tien, Chuen-Lin;Pan, Jui-Wen;Yang, Tsung-Hsun;Tsuei, Chih-Hsuan;Huang, Yi-Han
    • Journal of the Optical Society of Korea
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    • 제17권5호
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    • pp.376-383
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    • 2013
  • The design of the LEDs lighting in general household illumination was proposed and compared with the fluorescent lighting in this study. Using the LED as a light source would promote energy saving lighting for household illumination purposes. We used the LightTools and DIALux software to design and simulate different standards of illuminance, different correlated color temperatures and different color rendering indices for household environments. The power consumption and efficiency of traditional illuminated light sources and an LED light source with the same standard of illuminance for lighting the household environment were analyzed and compared with each other. Finally, our results show the advantages of using white-light LEDs for lighting and household illumination.

인터넷 웹기반 RADIANCE 렌더링 시스템 사용을 위한 조명기구의 데이터베이스 구축 (Establishment of the Luminaire Database for Using on Internet Web-based RADIANCE Rendering System)

  • 이정은;오은숙;최안섭;송규동
    • 한국조명전기설비학회:학술대회논문집
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    • 한국조명전기설비학회 2003년도 학술대회논문집
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    • pp.203-207
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    • 2003
  • In the present, most lighting simulation programs are based on luminaires data produced at overseas. Currently, it is difficult to use proper domestic luminaire database in most lighting simulation programs, because there are only oversea luminaire database available. Therefore, in this study, domestic luminaire database were developed and categorized and applied to Internet Web-based RADIANCE rendering system. Luminaire database are constructed with 3D modelings, materials and IES data of each luminaire.

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사실적인 리라이팅 시스템 연구 (Realistic Re-lighting System with Occlusion)

  • 박재욱
    • 만화애니메이션 연구
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    • 통권38호
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    • pp.133-144
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    • 2015
  • 3D 애니메이션에서의 라이팅 작업은 많은 노동력과 시간이 걸리는 일이다. 예를 들어서 2014년에 글로벌하게 배급된 극장용 애니메이션 Postman Pat The Movie에서는 60여명의 라이팅 아티스트가 필요했으며, 이 아티스트들은 샷의 피드백에 빠르게 대응해야 하지만, 복잡한 샷들은 많은 렌더시간을 필요로 해서 테스트 렌더링을 하며 작업 대응을 하기 힘든 문제가 있었다. 2005년 이후 이러한 상황에 대처하고자 리라이팅 기법을 사용하는 경우가 있었으나, 하지만, 기존의 리라이팅 방식으로는 그림자를 얻어낼 수가 없기 때문에 사실적이거나 자연스러운 결과물을 얻어낼수가 없어서 국내 애니메이션 제작에서 거의 사용되지 못하였다. 본 논문에서는 Rasterization된 앰비언트 어클루전을 각 라이트 별로 리라이팅 계산에 접목시켜 빠른 계산을 유지하면서도 사실적인 퀄러티를 얻어낼 수 있는 리라이팅 시스템을 구현하였다. 이 리라이팅 시스템은 2014년 글로벌하게 개봉된 헐리우드 애니메이션인 Postman Pat : The Movie에 채택되어 성공적인 제작을 해내는데 큰 기여를 하였다. 이후 애니메이션 제작에 이 방법이 더 많이 활용되어 다른 제작사에서도 제작비의 절감과 함께 좀 더 완성도 있는 결과물을 제작할 수 있는 계기가 되길 바란다.