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

Title:

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

Document Type and Number:

WIPO Patent Application WO/2016/066018

Kind Code:

A1

Abstract:

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.

Inventors:

HU JIANGBI (CN)
MA WENQIAN (CN)
MEI SHILONG (CN)
LU XIAOSHUN (CN)
CAO JIANPING (CN)
WANG WEILI (CN)
ZHANG YUANFENG (CN)
ZHANG XIAOQIN (CN)
GUO DA (CN)
WANG MENG (CN)
LI XIAOYU (CN)
GAO LINXI (CN)
GAO XIAOJUAN (CN)
LIU FENG (CN)

Application Number:

PCT/CN2015/091962

Publication Date:

May 06, 2016

Filing Date:

October 15, 2015

Export Citation:

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Assignee:

UNIV BEIJING TECHNOLOGY (CN)
GUIZHOU EXPRESSWAY GROUP CO LTD (CN)

International Classes:

G01M11/00

Foreign References:

CN104266823A	2015-01-07
CN204630714U	2015-09-09
CN104296967A	2015-01-21
CN104316171A	2015-01-28
CN104533441A	2015-04-22
CN102595679A	2012-07-18
CN102103015A	2011-06-22
CN101938878A	2011-01-05
JP2014022090A	2014-02-03
US20110156925A1	2011-06-30

Other References: