Establishment of a metric to characterize retroreflector properties using a consumer-grade colour camera

作     者：Huayang He Wenying Su Qiutong Cheng Huayang He;Wenying Su;Qiutong Cheng

作者机构：National Center of Metrization for Equipments of Roads and BridgesResearch Institute of Highway Ministry of TransportBeijing 100088China Division of Optical MetrologyNational Institute of MetrologyBeijing 100029China 

出 版 物：《Transportation Safety and Environment》 (交通安全与环境（英文）)

年 卷 期：2023年第5卷第1期

页      面：31-40页

核心收录：

学科分类：1304[艺术学-美术学] 13[艺术学] 08[工学] 0804[工学-仪器科学与技术] 0802[工学-机械工程] 

基　　金：funded by the Central Public-Interest Scientific Institution Basal Research Fund(Grant Nos.2020–9021 and 2021–9021b) the National Key Research and Development Program of China(Grant No.2021YFF0600205) 

主　　题：camera chromaticity coordinates coefficient of retroreflection retroreflective sheeting retroreflector 

摘      要：The coefficients of retroreflection and chromaticity coordinates are critical metrics for determining the quality of a ***,conventional retroreflection measurement techniques rely heavily on the night-time colour,size and characteristics of thesample being *** complicates the measurement process and leads to deviations in the test *** addition,chromaticitycannot be determined using this ***,it is necessary to improve the measurement accuracy,simplify themeasurement process and achieve themeasurement of the traffic sign RA and chromaticity coordinates *** this study,an improved method for retroreflector characterization using imaging was *** allowed for the measurement of the coefficientsof retroreflection and the chromaticity coordinates simultaneously,and only a white standard sample was required for *** primary components of the proposed system included a lighting projector,a receiver,two motorized rotational stages,a retroreflective sample holder and customized software that using scaling factors to convert a digital signal into sample retroreflectioncoefficients and retroreflective chromaticity *** experimental results indicated that the raw data output from thecamera exhibited a positive correlation relationship with the luminous flux from the surface of the *** maximummeasurementerrors for the retroreflection and chromaticity were−12.2 cd/(lx·m2)and−2.09%,*** was inexpensiveand convenient,used a commercially available digital camera,could help to identify defects in retroreflection and chromaticity forretroreflective sheeting and led to increased accessibility for the quality control of retroreflective sheeting.