Measurement of luminous environment using digital camera

Pao Yue-kong Library Electronic Theses Database

Measurement of luminous environment using digital camera

 

Author: Chan, Cheuk-ka
Title: Measurement of luminous environment using digital camera
Degree: M.Eng.
Year: 2007
Subject: Hong Kong Polytechnic University -- Dissertations.
Luminescence -- Measurement.
Interior lighting -- Measurement.
Digital cameras -- Testing.
Department: Dept. of Building Services Engineering
Pages: 214 leaves : col. ill. ; 30 cm.
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2117568
URI: http://theses.lib.polyu.edu.hk/handle/200/1031
Abstract: Lighting is one of the major building services subsystems in a building. In order to indicate the lighting quality, lighting measurement is needed. In most of the cases, luminance meter is used to obtain the luminance value. However, this project has found that there are advantages in using the digital camera. This dissertation describes two approaches of estimating surface luminance using digital cameras. The first method estimated the luminance by finding out the relationship between the known luminance and the luminosity value. High Dynamic Range (HDR) Photography technique was used in second approach. The estimated luminance was obtained from the luminance map which is generated by the software provided on the internet. In order to minimize the error, different preliminary tests were carried out. Two field tests were undertaken to investigate the reliability, accuracy and effectiveness of these two methods. Six digital cameras and a mobile phone with photo taking function were chosen to conduct the tests. The result from the handheld luminance meter was set as the most accurate result and used for comparing with the estimated luminance and studying the error of the test. The error appeared in both approaches was at a reasonable level of around 10%. The polynomial relationship was found to be the most suitable relation in the first approach. In addition, the accuracy of the result was affected by the resolution of the CCD detector.

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