Laser & Optoelectronics Progress, Volume. 56, Issue 2, 022201(2019)
Method for Glare Measurement Based on a Digital Camera Image in Interior Lighting
A digital imaging method is proposed to measure the uncomfortable glare in interior lighting. Our study includes the systematic derivation of three parameters: the position index, solid angle from the viewer's perspective, and average luminance of glare source. To extract the profile information of the lighting sources, an adaptive threshold method was employed. The Unified Glare Rating (UGR) was calculated and analyzed with a digital camera image of actual office lighting conditions. The results show that the mean relative errors of the obtained position index, solid angle, and average luminance of the glare source were equal to 1.319%, 4.296%, and 3.001%, respectively. For a background luminance of 12.910 cd·m -2, the calculated value of the UGR was equal to 12.606, with a relative error of 4.326%. The advantages of this method are its simple calculations, high accuracy, and easy implementation. By applying our method to the glare test in indoor lighting, a theoretical framework for the development of a convenient and fast glare test system can be constructed.
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Huijuan Tian, Zhen Hong, Tiantian Hao, Hui Zhang. Method for Glare Measurement Based on a Digital Camera Image in Interior Lighting[J]. Laser & Optoelectronics Progress, 2019, 56(2): 022201
Category: Optical Design and Fabrication
Received: Jun. 28, 2018
Accepted: Aug. 2, 2018
Published Online: Aug. 1, 2019
The Author Email: Tian Huijuan (tianhjgx@126.com)