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Title: On the calibration of high dynamic range photography for luminance measurements in indoor daylit scenes
Authors: Ng, RTH
Chung, TM
Keywords: Calibration factor
Daylit environment
High dynamic range photography
Luminance measurement
Issue Date: 2011
Publisher: Taylor & Francis
Source: Architectural science review, 2011, v. 54, no. 1, p. 39-49 How to cite?
Journal: Architectural science review 
Abstract: This article describes a study of two issues concerning the calibration of high dynamic range (HDR) photography for luminance measurements in indoor daylit spaces: (i) the selection of a target in a scene for calibration and (ii) the variation of the calibration factor with different daylight levels. Luminance measurements of coloured and grey targets were conducted in a classroom under stable sky conditions using a calibrated luminance meter and HDR photography. Comparisons between luminance values measured by HDR photography and the spot luminance meter were carried out. This study affirms the findings of a previous study that grey targets are more suitable for use in the calibration of HDR photography for luminance measurements. Using a grey surface of 18% reflectance, the ratio between luminances obtained by the two methods, regarded as the calibration factor, was computed. It was found that there was a weak and insignificant correlation between calibration factor and daylight levels within the range of investigation in this study.
ISSN: 0003-8628
EISSN: 1758-9622
DOI: 10.3763/asre.2010.0007
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