A study of using HDR imaging technique to measure the luminous environment

Pao Yue-kong Library Electronic Theses Database

A study of using HDR imaging technique to measure the luminous environment

 

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: Dept. of Building Services Engineering
Pages: 101 leaves : ill. ; 31 cm.
InnoPac Record: http://library.polyu.edu.hk/record=b2356384
URI: http://theses.lib.polyu.edu.hk/handle/200/5776
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.

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