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公开(公告)号：US10746605B2
公开(公告)日：2020-08-18
申请号：US15580363
申请日：2016-12-30
发明人： Jiangbi Hu , Xiaoyu Li , Xiaojuan Gao , Xiaoqin Zhang , Guiping Guan , Jianmin Wang , Feng Liu , Linxi Gao , Yuanfeng Zhang , Jiamei Liu , Pengfei Xu , Jianlong Cheng , Jiechao Cheng , Ronghua Wang
摘要： The present invention relates to a visual efficacy measuring method for objects in different light environments, which comprises: (a) setting a light environment; (b) measuring a relationship between color temperature and time; (c) a driver visually recognizing a target object; (d) resetting the light environment, and repeating the step (c); (e) processing the visual recognition information data collected by the experiments so as to establish a relationship of the visual recognition time in relation with the light environmental parameters of color temperature, color rendering index and brightness; (f) performing visual efficacy analysis according to the processing results of the visual recognition information data. The present invention also provides a color temperature standard determining method for a tunnel middle section in day time, which comprises: (a) setting a light environment; (b) measuring a relationship between color temperature and time; (c) selecting a stably distributed color temperature segment; (d) determining the color temperature standard. The method of the present invention performs visual efficacy analysis of the influence that light environment settings of illumination on a night road or in a tunnel middle section have on drivers' visual recognition activity, thereby providing a good guiding standard for reasonable and efficient setting of color temperature, color rendering index and average brightness of an illumination device.
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公开(公告)号：US10452929B2
公开(公告)日：2019-10-22
申请号：US15520592
申请日：2015-10-15
发明人： Jiangbi Hu , Wenqian Ma , Shilong Mei , Xiaoshun Lu , Jianping Cao , Weili Wang , Yuanfeng Zhang , Xiaoqin Zhang , Da Guo , Meng Wang , Xiaoyu Li , Linxi Gao , Xiaojuan Gao , Feng Liu
摘要： 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 L20 at the position where the driver visually discovers the target object and calculating the brightness reduction factor K to be the ratio between L and L20; (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: D = 215 1 + e ( - 708 + 56 ) + 27.6 ; (f) substituting a safe stopping sight distance D0 corresponding to a maximum speed limit of the tunnel into the formula to obtain the minimum brightness reduction factor K0 of 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.
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