Open AccessVISION EXPERIMENT II ON PERCEPTION OF CORRELATED COLOUR TEMPERATURE
Author(s) -
Sunhwa Oh,
Yongho Kwak,
Yoshihiro Ohno
Publication year - 2020
Language(s) - English
Resource type - Conference proceedings
DOI - 10.25039/x47.2020.op02
Subject(s) - chromaticity , nist , ellipse , mathematics , diagram , optics , lightness , space (punctuation) , perception , artificial intelligence , physics , computer vision , geometry , computer science , statistics , speech recognition , psychology , neuroscience , operating system
This study investigates which chromaticity space, (u, v) or (u’, v’), has a better correlation with human perception when correlated colour temperature is calculated. The vision experiment was conducted using the NIST Spectrally Tuneable Lighting Facility simulating a real-size interior room. A total of 22 subjects evaluated eight different test lighting settings at 2 700 K, 3 500 K, 4 500 K, and 6 500 K with Duv shifts of +0.015 or –0.015. The results showed that the (u’, v’) chromaticity space was better at a low CCT, 2 700 K, but the results were neutral or (u, v) slightly better at high CCTs. The difference depending on CCT can be explained from MacAdam ellipses, i.e., the shape of the ellipses is circular at lower CCTs on the (u’, v’) diagram and deviates from circle as CCT goes higher. There were also differences with subjects’ age observed.