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You searched on: Author: Yoshihiro Ohno

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1. Defining the visual adaptation field for mesopic photometry: How does a high-luminance source affect peripheral adaptation?
Published: 10/25/2015
Authors: Yoshihiro Ohno, Tatsukiyo Uchida
Abstract: CIE 191:2010 recommends the mesopic photometry system, in which the luminous efficiency function is determined from the adaptation luminance. However, it cannot be practically implemented because the adaptation field to determine the adaptation l ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=917534

2. ANALYSES OF ERRORS ASSOCIATED WITH PHOTOMETRIC DISTANCE IN GONIOPHOTOMETRY
Published: 7/31/2015
Authors: Yoshihiro Ohno, V. Jacobs, Peter Blattner, Tony Bergen, Udo Krueger, P. Rombauts, F. Schmidt, Peter Hanselaer
Abstract: 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 phot ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=918711

3. VISION EXPERIMENT ON CHROMA SATURATION FOR COLOR QUALITY PREFERENCE
Published: 7/31/2015
Authors: Yoshihiro Ohno, Carl C Miller, Mira Fein
Abstract: 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 t ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=918717

4. Development of the IES method for evaluating the color rendition of light
Published: 6/30/2015
Authors: Yoshihiro Ohno, Aurelien David, Kevin Houser, Minchen Wei, Michael Royer, Kevin Smet, Lorne Whitehead
Abstract: 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 ob ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=918695

5. An Experimental Approach to A Definition of The Mesopic Adaptation Field
Published: 5/14/2015
Authors: Tatsukiyo (Tatsukiyo) Uchida, Yoshihiro Ohno
Abstract: 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 i ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=911983

6. Solid State Lighting Annex 2013 Interlaboratory Comparison Final Report
Published: 10/9/2014
Author: Yoshihiro Ohno
Abstract: 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=916269

7. ANGULAR CHARACTERISTICS OF THE SURROUNDING LUMINANCE EFFECT ON PERIPHERAL ADAPTATION STATE IN THE MESOPIC RANGE
Published: 4/23/2014
Authors: Yoshihiro Ohno, Tatsukiyo Uchida
Abstract: CIE 191:2010 recommends a mesopic photometry system based on peripheral visual tasks. For implementation of the system, the visual adaptation field needs to be defined, taking into account the surrounding luminance effect on the adaptation state. A ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915671

8. VISION EXPERIMENT ON ACCEPTABLE AND PREFERRED WHITE LIGHT CHROMATICITY FOR LIGHTING
Published: 4/23/2014
Authors: Yoshihiro Ohno, Mira Fein
Abstract: Standards on white light chromaticity of fluorescent lamps are available for more than three decades, but the specifications in these standards have not been based on human vision perception data. Anecdotes say lights with chromaticities below the ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=915672

9. Practical Use and Calculation of CCT and Duv
Published: 10/18/2013
Author: Yoshihiro Ohno
Abstract: 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=912622

10. Report of the Key Comparison CCPR-K5 Spectral Diffuse Reflectance
Published: 10/2/2013
Authors: Yoshihiro Ohno, Maria E Nadal, Kenneth L Eckerle, E. A. Early
Abstract: 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 ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=913968



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