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Device and method for automatically measuring driving sight distance before road turning

An automatic measurement and forward driving technology, applied in the field of driving sight distance measurement, can solve the problems of inconvenient measurement, high use cost, manual measurement, etc., and achieve the effects of intuitive calculation results, low use cost and convenient detection

Active Publication Date: 2017-12-12
CHANGAN UNIV
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Problems solved by technology

[0004] The object of the present invention is to provide a kind of automatic measuring device and measuring method of driving sight distance before road turning, solve the problem that the traditional driving sight distance measuring method before turning road is to use laser range finder, tape measure etc. to carry out manual measurement or visual inspection, these measurements Defects of high instrument use cost, inconvenient measurement and large error

Method used

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  • Device and method for automatically measuring driving sight distance before road turning
  • Device and method for automatically measuring driving sight distance before road turning
  • Device and method for automatically measuring driving sight distance before road turning

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Embodiment Construction

[0040] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0041] Such as figure 1 As shown, a kind of automatic measuring device for driving sight distance before turning road provided by the present invention comprises CCD camera 1, and CCD camera 1 is fixed on the middle position of the front windshield inner side of vehicle 2 by columnar bracket; Wherein, columnar bracket is welded on On the front top steel plate of the vehicle 2; the CCD camera 1 is connected with the industrial computer through a video acquisition card and a BNC video cable.

[0042]During installation, the height h between the CCD camera 1 and the ground is 1.86 meters, the effective focal length f is 26.866 millimeters, and the camera lens is facing downward toward the front ( figure 1 Mark Z in 0 ), the pitch angle β of the CCD camera is 12.5°.

[0043] In this embodiment, the CCD camera adopts 1 / 4 "SONY machine vision special camera, eff...

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Abstract

The invention provides a device and a method for automatically measuring driving sight distance before road turning. The method comprises the following steps: firstly, performing gray equalization, filtering and Sobel edge detection on an acquired image sequentially through an industrial personal computer, determining an interested area of the detected image, and performing threshold segmentation on the interested area by an optimal threshold value method to obtain a target area and a background area; secondly, acquiring a lane line equation of the target area; thirdly, extracting a calculation feature point of the driving sight distance on the lane line according to the lane line equation; finally, according to the pixel coordinate values of the calculation feature point of the driving sight distance, performing inverse perspective protection conversion to acquire the distance between the calculation feature point of the driving sight distance under the world coordinate system and the vehicle. The measuring method is simple in operation, convenient in detection, low in use cost, high in measuring precision and intuitive in calculation result, and manual measurement by a laser range finder, a measuring tape and the like is not needed.

Description

technical field [0001] The invention relates to a driving sight distance measuring technology, in particular to an automatic measuring device and a measuring method for a driving sight distance before a highway turns. Background technique [0002] Driving sight distance is one of the most important factors to ensure the safety of drivers on the road, and it is also one of the important indicators for analyzing and evaluating the quality of highway design and operation. Highway curve is a special structure in the highway carrier, and its linear design is complex. Highway curve, as one of the main highway curves, has become a frequent area of ​​traffic accidents, which seriously restricts the improvement of road traffic safety in our country. Relevant studies have found that insufficient driving sight distance and inaccurate judgment of road conditions on curved roads, leading to wrong driving behaviors are important reasons for many traffic accidents on curved roads. [0003...

Claims

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Application Information

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IPC IPC(8): G01C11/02G01C11/30
CPCG01C11/02G01C11/30
Inventor 刘永涛赵俊玮乔洁华珺关闯
Owner CHANGAN UNIV
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