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Method used for determining traffic flow running track of intersection

A traffic flow and intersection technology, applied in traffic flow detection and other directions, can solve the problems of non-motorized vehicles and pedestrians' randomness, reduce personal casualties and property losses, reduce per capita travel time, and improve traffic order and efficiency. Effect

Active Publication Date: 2015-09-16
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the greater randomness of non-motor vehicles and pedestrians, its driving trajectory is not a simple straight line or curve.

Method used

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  • Method used for determining traffic flow running track of intersection
  • Method used for determining traffic flow running track of intersection
  • Method used for determining traffic flow running track of intersection

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for determining the trajectory of traffic flow at an intersection is characterized by comprising the following steps:

[0023] 1) Obtain several images by collecting video files, and use the view software to obtain the coordinates of any kind of traffic flow in the image coordinate system at any time from the collected images, that is, the image coordinates (x t ,y t );

[0024] 2) Establish traffic flow image coordinates (x t ,y t ) and its corresponding actual coordinates (x d ,y d ) between the mutual conversion relationship:

[0025] a. Select 4 known feature points for calibration by on-site measurement, and establish a coordinate system by measuring the size to obtain the actual coordinates of the calibration points, that is (x gc,1 ,y gc,1 ),(x gc,2 ,y gc,2 ),(x gc,3 ,y gc,3 ),(x gc,4 ,y gc,4 ), and its corresponding image coordinates can be obtained directly through the view software, namely (x ic,1 ,y ic,1 ),(x ic,2 ,y ic,1 ),(x ic,3 ...

Embodiment 2

[0029] Taking the intersection of Wenchang Road and North University Road in Yangzhou City as an example, the steps to determine the trajectory of non-motorized vehicles at this intersection are as follows:

[0030] 1) Select 4 calibration points that can surround the research area, and the positions and coordinates of the 4 calibration points are shown in figure 2 :

[0031] Through the processing of the image file (view software) and the actual measurement of the intersection, the image coordinates (pixels) and actual coordinates (m) of the calibration point are respectively x ic,1 =458,y ic,1 =268,x ic,2 =19,y ic,2 =707,x ic,3 =1767,y ic,3 =625,x ic,4 =1674,y ic,4 =1055;x gc,1 =0,y gc,1 =0,x gc,2 =0,y gc,2 =34,x gc,3 =51,y gc,3 =0,x gc,4 =51,y gc,4 = 24;

[0032] 2) Select a representative 5-min interval in the video file as the research time period, collect 1 picture every 1 s, and collect 300 pictures in total, and draw all the actual coordinates inside t...

Embodiment 3

[0034] A method for determining the trajectory of traffic flow at an intersection, comprising the steps of:

[0035] 1) By collecting continuous dynamic images of traffic flow, the coordinates of traffic individuals in the image coordinate system can be obtained through the corresponding view software, that is, the image coordinates (x t ,y t );

[0036] 2) Select 4 known feature points for calibration by on-site measurement, and establish a coordinate system by measuring the size to obtain the actual coordinates of the calibration points (x d ,y d ), its corresponding image coordinates can be obtained by image software;

[0037] 3) According to the conversion formula of actual coordinates and image coordinates, namely The actual coordinates of traffic individuals at any position in the image can be obtained, where c 1 -c 8 is the coefficient of matrix conversion, which can be obtained from the image coordinates and actual coordinates of 4 known calibration points;

...

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Abstract

The invention discloses a method used for determining the traffic flow running track of an intersection, and relates to the field of mixed traffic flow traffic conflicts in traffic engineering. The image coordinate of a transportation individual is acquired through view software. Through the conversion formula of the image coordinate and an actual coordinate, the actual coordinate of the transportation individual at any moment is acquired. The conversion formula comprises eight unknown matrix conversion factors. By calibrating known points of four image coordinates and the actual coordinate at the intersection, the image coordinate and the actual coordinate of a calibration point are brought into the conversion formula to acquire the matrix conversion factors. On the basis of eight determined conversion factors, the actual coordinate of all moments of the transportation individual to be acquired is acquired. A coordinate system is depicted to acquire the running track of the traffic individual. The method provided by the invention has important significance for the quantification of the traffic conflicts of the intersection, the forecasting of traffic accident black spots and the improvement of traffic safety.

Description

technical field [0001] The invention relates to a method for determining the trajectory of traffic flow at an intersection through mutual conversion between image coordinates and actual coordinates, and relates to the field of mixed traffic flow traffic conflicts in traffic engineering. Background technique [0002] With the development of urban economy, the problem of traffic conflicts at intersections has become increasingly prominent. Conflicts between different types of traffic flows at an intersection must meet two conditions: one is that the trajectories of different traffic flows have conflict points inside the intersection; the other is that different traffic flows arrive at the conflict point at the same time. Therefore, it is very important to study the traffic flow trajectory. [0003] In order to represent the conflict points of different traffic flows at intersections, a common practice is to use a straight line or curve to represent the trajectory of the traff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08G1/01
Inventor 沈家军王群曹志铭
Owner YANGZHOU UNIV
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