別紙5 (論文博士)
Date of submission

平成 29年

1月

13日

DepaTtment

情報・知能工学専攻
Contact

Applicant's name氏名

facU11y内田達清

糸召^教:員

中内茂樹教授Abstract

論文内容の要旨(博士)Iitle ofT11esis

博士学位論文名

Astudy ofAdaptation Luminancefor Mesopic photometry(薄明視測光のための順応輝度の研究)(Approx.80o wm'ds)/ξ︑(要旨 1,200字程度)
To measure light and lighting, current practice always uses the spectral
Iuminous efficiency function, V(λ), which repl'esents the visualperception by light at
equal power for each wavelength. However, the v(λ) was developed only based on
the sensitivity of the central field of view that adapts to higher light levels.1t is
known that the peripheral field of view shifts its spectral sensitivity to shorter
Wavelengths in darker light levels, ca11ed the mesopic range. current lighting
Practice is not optimized for the light levels
The recommended system for mesopic photometry published by the commission
Internationale de l'Eclairage (CIE) provides the spectra11Uminous efficiency
function,レ三.鉛;m(λ), the shape of which changes depending on the adaptation
Iuminance in the mesopic range. The system could open the door to moreノゞ'「energy・efficient lighting. According to an estimate in this study,10% t040% energy
Saving could be possible. However,1ack of methods to determine the adaptation
Iuminance for particular lit scenes prevents the system being implemented
This study aims to propose an adaptation field defin北ion, where the avera曾eIuminance sufficiently correlates to the adaptation luminance, for the mesopic
Photometry system implementation. The first question is whether the peripheral
adaptation depends only on the loca11Umlnance or on the global average luminancein the field ofview. A series ofvision experiment revealed thatthe loca11Uminance isthe dominant factor even for the mesopic and peripheral adaptation. However, theSurrounding luminance also slightly affects the adaptation and its impact may be
Significant when high・1Uminance sources exist in lit scenes
Further vision experiments were conducted to characterize the surrounding
Iuminance effect. According to the experiments, it can be considered as the veiling
Iuminance caused by stray lightin eyes. However, existing veiling luminance models
do not agree with the experimentalresults. This study proposes a new modelthat is
Suitable to predict the peripheralveiling luminance in the mesopic range
This study also proposes a method to simulate the adaptation luminance 丘omthe luminance distribution, by taking both the surrounding luminance effect andthe eye movements into account. The simulation results show good agreement withthe empirical data acquired in this study By applying the simulation method to realroad luminance distributions, adaptation field candidates were tested. According to

the analysis, the adaptation field can be defined as the design area of the lighting(i.e. road surfaCの for typical road lighting. Limitations of this proposal are also
discussed

For rigorous field photometric measurements with the mesoplc photometry
System, specia11Uminance meters that are not widely available at present areneeded. To avoid use of such instruments, this study proposes simplified
measurement methods. since road surface spectral reaectance variations cause

Some errors with the proposed methods, the error was analyzed with real road
Surface spectYalreaectance data. The analysis showsthat a proposed method with a4、

Correction can measure the mesopic quantities accurately enough only with
Conventionalinstruments and source spectralpower distribution data

The proposed adaptation field definition and the field measurement method
enable the mesopic photometry lmplementation to typicalroad lighting. These aⅡOWn)ore

energy・efacient lighting design for the applications. For

Inore

genel'aladaptation field defin北ions, further field luminance distrlbution exalnples areneeded. However, once such data is available, the method010gy established in thisStudy could 部Ve comprehensive solutions

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