| Author: | Wong, Kwun-ping |
| Title: | A study of using HDR imaging technique to measure the luminous environment |
| Degree: | M.Eng. |
| Year: | 2010 |
| Subject: | Hong Kong Polytechnic University -- Dissertations High dynamic range imaging. Luminescence -- Measurement Interior lighting -- Measurement |
| Department: | Department of Building Services Engineering |
| Pages: | 101 leaves : ill. ; 31 cm. |
| Language: | English |
| Abstract: | Many luminance measuring tasks require a luminance distribution of the total viewing field. If a conventional luminance meter, which can only perform point-by-point measurements, is used for such large-scale assessments, the process of measurement would be very time-consuming. The approach of image resolving luminance measurement, which could benefit from the continual development of position-resolving radiation detectors, represents a simplification of such measuring tasks. With the used of High Dynamic Range (HDR) image technique, the luminance of a whole scene can be estimated by just taking a set of multiple exposure photographs using a digital camera. However, calibration is required for such kind of technique. In the past, only one or two reference points were chose for the calibration. This should be based on an assumption that the calibration factor remains unchanged over the whole scene. Yet, there is lack of research in proofing such assumption. Therefore. this dissertation aims to investigate the variation of calibration factor in scenes of different color and different illuminance levels. |
| Rights: | All rights reserved |
| Access: | restricted access |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| b23563849.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 10.37 MB | Adobe PDF | View/Open |
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