A NEW METHOD FOR CALCULATING LUMINOUS FLUX USING HIGH DYNAMIC RANGE IMAGING AND ITS APPLICATIONS
Issue Date
2018-05-31Author
Poling, Reid
Publisher
University of Kansas
Format
69 pages
Type
Thesis
Degree Level
M.S.
Discipline
Civil, Environmental & Architectural Engineering
Rights
Copyright held by the author.
Metadata
Show full item recordAbstract
High Dynamic Range (HDR) photography is a camera-aided tool for measuring luminance and glare. This study explored a method of using HDR images to estimate luminous flux (in units of lumens) contributed from light sources and surfaces visible to the camera lens. The goal was to validate this camera-aided method for remote measurement of luminous flux and check its applications in a real lit environment. A pilot study was first conducted in the illumination laboratory (2400 LEEP2) to explore the idea and develop a series of equations, followed by a laboratory experiment using an integrating sphere to validate the method with an error of 6.2%. Next, the new method was used to estimate luminous flux in a real luminous environment. In a prior study, a series of HDR images were taken in an office space under fluorescent and LED lighting with varying levels of lighting control offered to a total of 30 participants. The wattage consumption of the lighting systems under each test scenario was also recorded. In this study, those HDR images were calibrated and analyzed to obtain per-pixel luminance data. Equations were then used to calculate lumens attributed from all surfaces and light sources in the office visible to the camera lens under different lighting conditions. The so calculated luminous flux obtained from the HDR images of different lighting settings was then compared with the associated wattage of the corresponding lighting condition. It was found that luminous flux and electrical energy were closely correlated. Luminous flux increased or decreased in the same way as wattage. This study proved that the new method for calculating luminous flux using high dynamic range imaging method is valid and useful for lighting practice and research.
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- Engineering Dissertations and Theses [1055]
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