Visibility monitoring using conventional roadside cameras - Emerging applications

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• 作者：Raouf Babari^a ; Nicolas Hautiè ; re^a ; ^{nicolas.hautiere@ifsttar.fr} ; É ; ric Dumont^a ; Nicolas Paparoditis^b ; James Misener^c
• 关键词：Camera ; Atmospheric visibility ; Road safety ; Meteorological observation ; Air quality ; Intelligent transportation systems
• 刊名：Transportation Research Part C ; Emerging Technologies
• 出版年：2012
• 期刊代码：177_0968090x
• 类别：et
• 出版时间：June, 2012
• 卷：22
• 期：Complete
• 页码：17-28
• 文件大小：843 K

摘要

The measurement of atmospheric visibility is an important element for road and air transportation safety. We propose in this paper a novel estimator of the atmospheric visibility by already existing conventional highway cameras, with a technique based on the gradient magnitude selected by applying Lambert鈥檚 law with respect to changes in lighting conditions. The response of this estimator is calibrated by non-linear regression with data from a visibility meter installed in a test site which has been instrumented with a camera. Through our technique, atmospheric visibility estimates are obtained with an average error of 30%for images taken in the day, with sky luminance between 10 and 8000 cd m^鈭? and visibility distances up to 15 km. Our results allow us to envision practical implementation on roadsides in the near future to determine local visibility for the benefit of road safety, meteorological observation and air quality monitoring.