Analytical Methods of the Road Tunnel Ambient Exterior Luminance Using Automatic Digital Test Technology
Guo Chun
Liu Yuliang
Wang Mingnian
Sun Zhitao
Zhang Xiao
Shen Junming
Abstract：By adopting the method of theoretical analysis , digital image grey value has a linear relationship with the exposure , and the calculation formula of luminance in various points of object in digital imaging process has been given .With road tunnel ambient exterior luminance L20 ( S) as the research object , and study of the automatic test and analysis methods , the method to analyze road tunnel ambient exterior luminance based on the digital imaging technology has been established .The process of testing road tunnel ambient exterior luminance by digital imaging technology , the method to demarcate sensitometric curve of digital camera , and the method to process test data have been established , eventually a method to automatic testing and analyzing the road tunnel ambient exterior luminance based on digital imaging technology has been established .Using the method of automatic testing and analyzing the road tunnel ambient exterior luminance , to conduct field test and analysis in two tunnels which were open to traffic on the Dujiangyan-Wenchuan highway , we just verified the test method .
Keywords：tunnelambient exterior luminanceautomatic testluminance calculationsensitometric curve
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 87-91,92 )