SAFE VISUAL RECOGNITION-BASED METHOD FOR STANDARD MEASUREMENT/CALCULATION OF DAYTIME TUNNEL ENTRANCE SECTION ILLUMINATION, AND SYSTEM THEREOF

摘要

Provided is a safe visual recognition-based method for standard measurement/calculation of daytime tunnel entrance section illumination, comprising: (a) parameters of the light environment inside the tunnel entrance section are set; (b) a feature location inside the tunnel is determined, and the average road surface brightness L of the feature location is measured; (c) a target is placed at the feature location inside the tunnel; a driver is made to drive at different speeds from outside the tunnel toward the target; the visual recognition distances D at which the driver discovers the target while driving at the different speeds are obtained; the road surface brightness L₂₀ at the location at which the driver discovers the target is measured; the values of the brightness reduction factor K being L and L₂₀ are obtained; (d) the average road surface brightness L at the tunnel entrance section is reset; (b) and (c) are repeated, and a plurality of sets of different visual recognition distances D and corresponding brightness reduction factors K is obtained; (e) a Sigmoid function model is used to calculate and fit the data of a plurality of sets of D and K, and the relational model formula of D and K, D=215/(1+e^(-70K+3.6))+27.6, is obtained; (f) the safe stopping sight distance D₀ of the maximum speed limit of the tunnel is substituted into the model formula, to arrive at the minimum brightness reduction factor K₀ of the daytime tunnel entrance section. In addition, the invention also relates to a system for implementing the safe visual recognition-based method for standard measurement/calculation of daytime tunnel entrance section illumination.