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  • ESTIMATION OF THE SPECTRAL RADIANCE OF A SKY ELEMENT USING PRINCIPAL COMPONENT ANALYSIS  [in Japanese]

    YATSUZUKA Hideki , UETANI Yoshiaki

    … The XYZ tristimulus values were transferred into the spectral radiance in two ways: (1) by using the CIE daylight illuminant and (2) by using the eigenvectors obtained by principal component analysis of spectral radiance of sky elements measured by a spectroradiometer. … The method (1) was mostly accurate, but was sometimes unable to estimate spectral radiance of blue skies because the CIE daylight illuminant was defined with the correlated color temperature being within the range of approximately 4,000 to 25,000Kelvin. …

    Journal of Environmental Engineering (Transactions of AIJ) 79(697), 227-232, 2014

    J-STAGE 

  • MEASUREMENT OF THE ALL SKY SPECTRAL RADIANCE DISTRIBUTION USING A DIGITAL CAMERA WITH A FISHEYE LENS  [in Japanese]

    YATSUZUKA Hideki , UETANI Yoshiaki

    … The accuracy of the fisheye camera is adequate for practical daylight design. … The XYZ tristimulus values are transferred into the all sky spectral radiance distribution in two ways: (1) by using the CIE daylight illuminant and (2) by using the eigenvectors obtained by principal component analysis of measured spectral radiances of the sky elements by a spectroradiometer. …

    Journal of Environmental Engineering (Transactions of AIJ) 78(690), 623-629, 2013

    J-STAGE 

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