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

Transportation Safety and Environment 2023年第1期5卷 31-40页

作者： Huayang He Wenying Su Qiutong Cheng National Center of Metrization for Equipments of Roads and Bridges Research Institute of Highway Ministry of TransportBeijing 100088China Division of Optical Metrology National Institute of MetrologyBeijing 100029China

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.

关键词： camera chromaticity coordinates coefficient of retroreflection retroreflective sheeting retroreflector

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