The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 22, 2019
Filed:
Oct. 15, 2015
Beijing University of Technology (Cn), Beijing, CN;
Guizhou Expressway Group Co., Ltd. (Cn), Guizhou, CN;
Jiangbi Hu, Beijing, CN;
Wenqian Ma, Beijing, CN;
Shilong Mei, Beijing, CN;
Xiaoshun Lu, Beijing, CN;
Jianping Cao, Beijing, CN;
Weili Wang, Beijing, CN;
Yuanfeng Zhang, Beijing, CN;
Xiaoqin Zhang, Beijing, CN;
Da Guo, Beijing, CN;
Meng Wang, Beijing, CN;
Xiaoyu Li, Beijing, CN;
Linxi Gao, Beijing, CN;
Xiaojuan Gao, Beijing, CN;
Feng Liu, Beijing, CN;
Beijing University of Technology (CN), Beijing, CN;
Guizhou Expressway Group Co., LTD (CN), Guizhou, CN;
Abstract
The invention relates to an illumination standard calculation method for a tunnel entrance section in daytime based on safe visual recognition. The method includes: (a) setting light environment parameters of the tunnel entrance section; (b) determining a feature position in the tunnel, and measuring the average road surface brightness L of the feature position; (c) placing a target object in the feature position and then making a driver drive at different speeds from outside the tunnel towards the target object to measure visual recognition distances D required by the driver to visually discover the target object under different driving speeds, and measuring the road surface brightness Lat the position where the driver visually discovers the target object and calculating the brightness reduction factor K to be the ratio between L and L; (d) resetting the average road surface brightness L of the tunnel entrance section and repeating steps (b) and (c) to obtain a plurality of different sets of visual recognition distances D and corresponding brightness reduction factors K; (e) using Sigmoid function model to calculate and fit the data of the plurality of sets of D and K to obtain a relational model formula of D and K: (f) substituting a safe stopping sight distance Dcorresponding to a maximum speed limit of the tunnel into the formula to obtain the minimum brightness reduction factor Kof the tunnel entrance section in daytime. The invention also relates to a system for implementing the illumination standard calculation method for a tunnel entrance section in daytime based on safe visual recognition.