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Method for detecting vehicle speed based on road monitoring videos

A technology for monitoring video and vehicle speed, applied in the traffic control system of road vehicles, traffic control system, image analysis, etc., can solve the problems of large road damage, high maintenance cost, and inability to record violations, and achieve single consumables and methods Simple, excellent detection effect

Inactive Publication Date: 2015-04-29
BEIJING JIAOTONG UNIV +1
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

All three speed measurement methods are characterized by high accuracy, but they cannot record violations while measuring speed
In particular, the speed measurement of the ground induction coil needs to bury the coil underground, which will cause great damage to the road surface and high maintenance costs

Method used

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  • Method for detecting vehicle speed based on road monitoring videos
  • Method for detecting vehicle speed based on road monitoring videos
  • Method for detecting vehicle speed based on road monitoring videos

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Embodiment Construction

[0023] In order to further illustrate the technical solution of the present invention, the present invention will be explained in detail through specific examples below.

[0024] ① Lane picture interception: intercept a pure road picture of a lane from the video image, such as figure 1 shown.

[0025] ② Acquire lane width information: Let the coordinates of each pixel in the lane image be (x, y), then when y=i, acquire the lane width, represented by the number of pixels, that is, pixel_number[i].

[0026] ③Calculate the actual distance of the lane represented by each pixel: If the actual width of the lane is 3.5 meters, the actual distance of the lane represented by a series of pixels whose coordinates are (x,i) is:

[0027] pixel_distance[i]=3.5m / pixel_number[i]. Save the actual distance pixel_distance[i] represented by each pixel into the file, which is convenient for subsequent vehicle speed measurement.

[0028] ④ Solve the correction coefficient: Carry out distance cal...

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Abstract

The invention discloses a method for detecting vehicle speed based on road monitoring videos. The method comprises the following steps: (1) dividing a lane using a lane marking line identification method and eliminating unnecessary background; (2) obtaining lane width information according to lane images; (3) calculating the actual distance represented by each pixel point; (4) solving the correction factor Beta which is used for correcting the actual lane distance represented by each pixel point; (5) calculating the optical flow of the vehicle to obtain the trajectory of the vehicle; (6) calculating the actual moving distance of the vehicle; (7) multiplying the correcting the distance by the correction factor to correct the distance; (8) calculating the speed. According to the invention, a video image analysis technology is adopted to decrease the cost of vehicle speed monitoring and speeding behavior recording; and in addition, the method also has the function of expanding the vehicle speed monitoring scope, and vehicle speed monitoring can be implemented at any place with cameras.

Description

technical field [0001] The invention relates to the field of speed measurement of intelligent transportation vehicles, in particular to a vehicle speed measurement method based on road monitoring video images. Background technique [0002] With the development of my country's economy, the penetration rate of automobiles has also increased rapidly, and traffic accidents have followed one after another with the increase of vehicles. Speeding is one of the culprits in the tragedy. [0003] At present, the main methods of vehicle speed measurement include radar speed measurement, laser speed measurement, ground induction coil speed measurement and so on. All three speed measurement methods are characterized by high accuracy, but they cannot record violations while measuring speed. In particular, ground induction coil speed measurement needs to bury the coil underground, which will cause great damage to the road surface and high maintenance costs. Contents of the invention ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08G1/052G06T7/00
Inventor 苗振江胡碧莹张强许万茹刘汝杰
Owner BEIJING JIAOTONG UNIV
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