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Novel traffic accident scene video speed measurement method based on four-point plane homography

A technology of traffic accidents and new methods, applied in the direction of traffic flow detection, traffic control system of road vehicles, traffic control system, etc.

Inactive Publication Date: 2020-07-07
TIANJIN UNIV OF TECH & EDUCATION TEACHER DEV CENT OF CHINA VOCATIONAL TRAINING & GUIDANCE
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Problems solved by technology

When the shooting direction of the camera is the same as the driving direction of the vehicle, the method of estimating the speed of the vehicle using the cross-ratio theory will encounter difficulties

Method used

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  • Novel traffic accident scene video speed measurement method based on four-point plane homography
  • Novel traffic accident scene video speed measurement method based on four-point plane homography
  • Novel traffic accident scene video speed measurement method based on four-point plane homography

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Embodiment Construction

[0055] A specific embodiment of the present invention will be described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific embodiment.

[0056] Such as Figure 1-Figure 6 Shown, the present invention comprises the following steps:

[0057] Step 1: Check the accident scene video to ensure that the video is intact and original;

[0058] Step 2: Check and record the frame rate of the on-site video recording, and use video processing software to extract all key frame photos in the video recording;

[0059] Step 3: In the space plane ∏ 1 and the digital image plane of the camera ∏ 2 Select 4 pairs of object points P k (x k ,y k ) and the corresponding image point I k (u k ,v k );

[0060] Step 4: For the object point P k (x k ,y k ) and the image point I k (u k ,v k ) for normalization processing, the coordinates of the point after processing are...

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Abstract

The invention discloses a novel traffic accident scene video speed measurement method based on four-point plane homography. The method is characterized in that the method comprises the following steps: 1, checking an accident scene video, so that the video is ensured to be intact and is an original video; 2, checking and recording the frame rate of the on-site video recording, and extracting all key frame photos in the video record by using video processing software; 3, respectively selecting four pairs of object points Pk (xk, yk) and corresponding image points Ik (uk, vk) on a space plane pi1 and a digital image plane pi 2 of the camera; 4, performing normalization processing on the object point Pk (xk, yk) and the image point Ik (uk, vk), wherein the coordinate of the processed point is PCk (xCk, yCk) and point ICk (uCk, vCk); 5, solving a vector h by using the normalized coordinate by using the formula (1), constructing a projection transformation matrix H by using the vector h, and calculating a matrix H-1. The invention relates to the field of detection equipment, in particular to a novel traffic accident scene video speed measurement method based on four-point plane homography. The vehicle speed can be conveniently determined.

Description

technical field [0001] The invention relates to the field of detection equipment, in particular to a new video velocity measurement method at the scene of a traffic accident based on a four-point plane homography. Background technique [0002] Speeding is a key issue in all types of fatal traffic accidents. How to judge the speed of the vehicles involved in the accident after the accident has brought difficulties to law enforcement officers investigating the occurrence of traffic accidents and on-site evidence collection, and consumes a lot of time. Therefore, it is necessary to calculate and analyze the speed of the participating vehicles at the time of the accident. [0003] The traditional vehicle speed estimation method uses measuring tools to measure the vehicle's stopping position, brake drag, tire footprint and other related distances on site, and then calculates the vehicle speed under typical collision conditions according to the empirical formulas of energy conser...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08G1/052G08G1/01G06T7/73
CPCG08G1/052G08G1/0129G06T7/73
Inventor 陈强刘晓锋关志伟彭涛候海晶
Owner TIANJIN UNIV OF TECH & EDUCATION TEACHER DEV CENT OF CHINA VOCATIONAL TRAINING & GUIDANCE
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