Use of a calibrated camera to study visibility in fog
When driving in foggy conditions, the impairment of vision may induce delay In the detection of obstacles and have negative impacts on traffic safety. In order to investigate the visibility thresholds of targets in these conditions, experiments were conducted in a fog chamber. As a first step, traditional photometers were used in order to monitor the luminance of the target and background in changing fog density. A new method using a calibrated camera was investigated in order to measure the complete visual field using a luminance matrix. The luminance map can subsequently be analysed in order to determine significant parameters for the visibility of the analysed objects. In addition to metrological aspects, the experiment data were analysed and compared to a theoretical approach using a Vision Model developed by Adrian. The visibility thresholds are discussed in relation to the experiment conditions.
visibility fog target camera photometer luminance contrast model vision
M. Colomb F. Greffier F. Fournela V. Boucher P. Morange P. Briand
Laboratoire Régional des Ponts et Chaussées de Clermont-Ferrand, 8-10 rue B. Palissy, 63017 Clermont Laboratoire Régional des Ponts et Chaussées de Clermont-Ferrand, 8-10 rue B. Palissy, 63017 Clermont Laboratoire Régional des Ponts et Chaussées dAngers, 23, Avenue de lAmiral Chauvin B.P. 69, Les Po
国际会议
26th Session of the CIE(国际照明委员会（CIE）第26届大会)
北京
英文
864-867
2007-07-04（万方平台首次上网日期，不代表论文的发表时间）