Image expansion rate based head-on video speed measurement method

An image expansion and video technology, applied in image enhancement, image analysis, image data processing and other directions, can solve the problems of reducing the real-time monitoring effect and large amount of calculation, and achieve the effect of high accuracy, simple algorithm and easy implementation.

Inactive Publication Date: 2017-10-24
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this technology uses a pattern matching algorithm, which has a large amount of calculation, which reduces the real-time effect of monitoring, and based on the angle of the camera looking down, no corresponding solution is given for the situation of head-on driving

Method used

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  • Image expansion rate based head-on video speed measurement method
  • Image expansion rate based head-on video speed measurement method
  • Image expansion rate based head-on video speed measurement method

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Embodiment 1

[0030] Such as figure 1 As shown, the optical axis of the camera is parallel to the moving direction of the moving object, S is the viewing cone point, P is the imaging plane, and B 0 and B 1 Respectively represent the positions of the same moving object at different distances from the imaging plane. Taking S as the origin, the direction of the characteristic line is the y-axis, and the optical axis is the z-axis. According to the right-hand system, it is established as figure 2 The coordinate system shown.

[0031] Such as image 3 As shown, the specific steps to calculate the speed of a moving object are:

[0032] 1) Correct the distortion of the video image of the moving object in the T period, and then use the edge detection technology to determine the contour of the object and select the feature line:

[0033] 1.1) Perform camera calibration. Determine the origin of the world coordinate system, and establish three feature points on the Z plane of the world coordina...

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Abstract

The invention relates to an image expansion rate based head-on video speed measurement method, which is characterized in that a characteristic line within the contour of a moving object is selected, the actual length H of the characteristic line and the length h0 in an image at the initial moment t0 are recorded, the image expansion rate [sigma]0 at the initial moment is obtained through comparing the number of pixels in the image of the object at the initial moment and the number of pixels in an image of the object at the next moment, then the speed v0 of the object at the initial moment is calculated according to a similar triangle principle, the length h1 of the characteristic line in the image at the next moment is calculated, and the speed of the object at the rest moments is acquired respectively through repeating the above process. According to the invention, the vehicle speed is determined according to the image expansion rate of a vehicle in the video, and the algorithm is simple and easy to implement. Meanwhile, the image expansion rate based head-on video speed measurement method utilizes all image information of the cross section of the measured object, is high in accuracy and good in stability, does not involve the hardware cost, overcomes a defect of complicated processing of traditional measurement methods, solves a problem, which cannot be solved by traditional algorithms, that the line of sight and the direction of motion are parallel, and can be applied to measurement of the vehicle speed in traffic accidents and real-time monitoring of cameras.

Description

technical field [0001] The invention relates to a technology in the field of speed testing, in particular to a head-on video speed measurement method based on image expansion ratio. Background technique [0002] In the handling of traffic accidents, the judgment of vehicle speed directly affects the analysis of accident causes and the identification of responsibilities. Vehicle speed detection methods include radar speed measurement, laser speed measurement, induction coil speed measurement, IC card speed measurement and so on. With the improvement of the performance of computers and image acquisition equipment, video speed measurement has also become a new means of speed measurement. [0003] Video speed measurement mainly uses the image information in the video to obtain the driving speed of the vehicle by means of image processing technology. The current processing methods include virtual coil method and positioning tracking method, which mainly focus on the angle of lo...

Claims

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Application Information

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IPC IPC(8): G06T7/80G06T7/246G06T7/13G08G1/052G01P3/38
CPCG01P3/38G06T2207/10016G06T2207/30232G06T2207/30236G08G1/052
Inventor 杨小波张晓云杨智淳
Owner SHANGHAI JIAO TONG UNIV
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