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Search Publications by: Yoshi Ohno (Fed)

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Displaying 1 - 25 of 197

VISION EXPERIMENT ON CHROMA SATURATION PREFERENCE IN DIFFERENT HUES

November 15, 2017
Author(s)
Yoshihiro Ohno, Youngshin Kwak, Semin Oh
Increase of chroma is known to be a major factor for color quality preference in lighting, and gamut area measures are often used to evaluate preference aspects. However, gamut area accounts for chroma differences equally for all hue directions

VISION EXPERIMENT ON PERCEPTION OF CORRELATED COLOR TEMPERATURE

November 14, 2017
Author(s)
Yoshi Ohno, Hyeyoung Ha, Youngshin Kwak
The correlated color temperature (CCT) is defined by the closest point on the Planckian locus from a light source on the (now obsolete) CIE 1960 (u, v) diagram, while the current standard uniform color space is the CIE 1976 (u', v') diagram. To re-visit

Color Quality (book chapter)

July 11, 2017
Author(s)
Yoshihiro Ohno
This book chapter provides the fundamentals of colorimetry and color quality for solid state lighting, including descriptions of the current standards on chromaticity of SSL light sources and color rendering, and recent studies on these topics. Section 8.1

Photometry (Chapter of Handbook of Visual Optics)

April 25, 2017
Author(s)
Yoshihiro Ohno
The fundamental concept of photometry, the definition of the photometric base unit candela, and the spectral luminous efficiency function V(lambda) are first introduced. Then definitions of important photometric quantities and units, such as luminous flux

Color Quality Metrics – Recent Progress and Future Perspective

July 30, 2016
Author(s)
Yoshihiro Ohno
The color quality of light sources for lighting includes the effects of white light chromaticity, as well as color rendition characteristics, including color fidelity and the aspects related to color preference and perception. In this paper, the current

SOLID-STATE LIGHTING MEASUREMENT ASSURANCE PROGRAM SUMMARY WITH ANALYSIS OF METADATA

March 31, 2016
Author(s)
Carl C. Miller, Yoshihiro Ohno, Maria E. Nadal, Benjamin K. Tsai, Yuqin Zong
The National Institute of Standards and Technology (NIST) began to offer proficiency testing for Solid-State Lighting (SSL) products through a Measurement Assurance Program (MAP) in 2010. This article communicates the results of the first version of the

Vision experiment ii on white light chromaticity for lighting

March 30, 2016
Author(s)
Yoshihiro Ohno, Semin Oh
In response to a published discussion (Wei & Houser, 2015) on the 2013 NIST experiment on white light chromaticity for lighting (Ohno & Fein, 2013), the second experiment was conducted at NIST to determine the white light chromaticity perceived most

ANALYSES OF ERRORS ASSOCIATED WITH PHOTOMETRIC DISTANCE IN GONIOPHOTOMETRY

July 31, 2015
Author(s)
Yoshihiro Ohno, V. Jacobs, Peter Blattner, Tony Bergen, Udo Krueger, P. Rombauts, F. Schmidt, Peter Hanselaer
In lighting calculations and simulations, the emission of a light source is conventionally modelled using the far-field intensity, also termed luminous intensity distribution (LID). Previous studies have indicated that the traditional limiting photometric

VISION EXPERIMENT ON CHROMA SATURATION FOR COLOR QUALITY PREFERENCE

July 31, 2015
Author(s)
Yoshihiro Ohno, Carl C. Miller, Mira Fein
Color Rendering Index (CRI) often does not correlate well with visual evaluation of color rendering of light sources at real illuminated scenes. The main reason is that CRI measures color fidelity, while general users judge color rendering based on their

Development of the IES method for evaluating the color rendition of light

June 30, 2015
Author(s)
Yoshihiro Ohno, Aurelien David, Kevin Houser, Minchen Wei, Michael Royer, Kevin Smet, Lorne Whitehead
We have developed a two-measure system for evaluating light sources’ color rendition that builds upon conceptual progress of numerous researchers over the last two decades. The system quantifies the color fidelity and color gamut (i.e. change in object

An Experimental Approach to A Definition of The Mesopic Adaptation Field

May 14, 2015
Author(s)
Tatsukiyo (. Uchida, Yoshihiro Ohno
The CIE 191 mesopic luminous efficiency function depends on the luminance of visual adaptation field, therefore, it must be measured to implement the mesopic photometry method. However, the size and shape of the adaptation field are not defined in CIE 191

Solid State Lighting Annex 2013 Interlaboratory Comparison Final Report

October 9, 2014
Author(s)
Yoshihiro Ohno
The Interlaboratory Comparison, IC2013, for measurement of solid state lighting (SSL) products was conducted by International Energy Agency (IEA) 4E SSL Annex between October 2012 and August 2013. 55 laboratories from 18 countries participated in this

Practical Use and Calculation of CCT and Duv

October 18, 2013
Author(s)
Yoshihiro Ohno
The Correlated Color Temperature (CCT) is often used to represent chromaticity of white light sources, but chromaticity is two-dimensional, and another dimension, the distance from the Planckian locus, is often missing. Duv is defined in ANSI C78.377 for

Report of the Key Comparison CCPR-K5 Spectral Diffuse Reflectance

October 2, 2013
Author(s)
Yoshihiro Ohno, Maria E. Nadal, Kenneth L. Eckerle, E. A. Early
This is an official report from Consultative Committee of Photometry and Radiometry (CCPR) on the Key Comparison CCPR-K5 spectral diffuse reflectance, conducted in the framework of CIPM Mutual Recognition Arrangement (MRA). 13 national laboratories