Accurate Measurement of Daylit Interior Scenes Using High Dynamic Range Photography
Loading...
Date
2016
Authors
Jakubiec, J. Alstan
Van Den Wymelenberg, Kevin
Inanici, Mehlika
Mahic, Alen
Journal Title
Journal ISSN
Volume Title
Publisher
Institute for Health in the Built Environment, University of Oregon
Abstract
This paper investigates accuracy in typical High Dynamic Range (HDR) photography techniques
used by researchers measuring high resolution luminance information for visual comfort studies
in daylit spaces. Vignetting effects of circular fisheye lenses are investigated for reproducibility
between different lenses of the same model and sharing between researchers. The selection of
aperture size is related to vignetting intensity, dynamic range and potential for lens flare.
Lighting variability during capture processes is also tracked, and it is recommended to measure
vertical illuminance in order to validate the stability of a scene. Finally, luminous overflow—a
concept where a HDR photograph cannot measure the true luminous environment—is
introduced. Its effect on the glare metrics UGR and DGP is investigated by using neutral density
(ND) filters to increase the dynamic range of photographs under direct sunlight. It is
recommended to use ND filters in scenes with vertical illuminances greater than 5 000 lx or with
direct vision of the sun.
Description
10 pages
Keywords
lighting measurements, high dynamic range photography, luminance
Citation
Jakubiec, J., Van Den Wymelenberg, K., Inanici, M., & Mahic, A. (2016). Accurate Measurement of Daylit Interior Scenes Using High Dynamic Range Photography. Presented at the CIE Lighting Quality and Energy Efficiency Conference, Melbourne.