Traffic signal artery phase difference optimization method based on license plate recognition data
A technology of license plate recognition and traffic signal, which is applied in the direction of traffic signal control, can solve the problem of large time granularity, and achieve the effect of achieving coordinated control and expanding acquisition capabilities
Inactive Publication Date: 2011-02-16
隋亚刚
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Problems solved by technology
Since traffic surveys are generally carried out at sampling times such as peak hours and off-peak hours, the time granularity is relatively large, and it cannot fundamentally reflect the change in phase difference caused by the change in vehicle speed on the trunk line.
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[0017] In order to enable those skilled in the art to understand the technical means, creative features, objectives and effects of the present invention easily, the present invention will be further explained below in conjunction with specific drawings.
[0018] The block diagram of the coordinated control structure of the traffic signal trunk line based on high-definition video detection is as follows figure 1 Shown. Taking an intersection as an example to illustrate the implementation process of the method for optimizing the phase difference of the traffic signal trunk line of the present invention, the specific method is as follows:
[0019] 1. Select the trunk line port, determine the basic information such as the intersection ID number, camera ID number, and junction detector ID number; set the release phase, phase and phase sequence, and ensure that the trunk line port phase sequence is the same, and the cycle duration of each junction is the same Or double the period long.
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The invention provides a traffic signal artery phase difference optimization method based on license plate recognition data, belonging to the fields of road traffic signal control and high definition video detection. The method comprises the following concrete steps: step1, calculating the cycle length of each crossing, and determining the key crossing and the cycle length thereof; step2, detecting license plate data, and packaging and uploading the license plate recognition data to a traffic signal control center; step3, comparing a license plate number with a pass crossing ID number, and calculating the time difference of passing an upstream crossing and a downstream crossing which are adjacent; step4, taking 5 minutes as a unit, and calculating the average travel time for passing the upstream crossing and the downstream crossing; and step 5, comparing the average travel time for passing the upstream crossing and the downstream crossing with the phase difference of the current upstream crossing and the downstream crossing; if the travel time error is continuously larger than 10% of the current phase difference for three times, updating the phase difference; and if not, returning to the step4 to continue to carry out statistical calculation.
Description
Technical field [0001] The invention relates to the field of road traffic signal control and high-definition video detection. Background technique [0002] With the continuous development of my country's economy and society, urban road traffic is basically saturated. Road congestion and the resulting environmental pollution, low urban operation efficiency, and traffic accidents have become bottlenecks that restrict urban economic and social development. Traditional traffic signal control systems use induction coils as vehicle detectors to collect traffic flow, occupancy, and average speed data to implement optimal traffic signal control. However, induction coils generally suffer from shortcomings such as easy damage, high maintenance costs, and limited measurement data. On the other hand, the existing urban traffic signal control system's trunk line coordination control method determines the phase difference between the upstream and downstream intersections in the trunk line base...
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IPC IPC(8): G08G1/07G08G1/08
Inventor 隋亚刚
Owner 隋亚刚