Vehicle speed detection method based on target motion track

A vehicle speed and detection method technology, applied in the field of intelligent transportation, can solve the problem of low accuracy of vehicle speed

Active Publication Date: 2015-01-14
CHINA SHIPPING NETWORK TECH
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Problems solved by technology

[0004] The purpose of the present invention is to provide a vehicle speed detection method based on the target motion tr

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  • Vehicle speed detection method based on target motion track
  • Vehicle speed detection method based on target motion track
  • Vehicle speed detection method based on target motion track

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Embodiment Construction

[0123] The vehicle speed detection method based on the target motion track of the present invention comprises three steps, which are target segmentation, target tracking based on Kalman filter and speed calculation in sequence. The specific implementation is as follows:

[0124] 1. Target segmentation

[0125] This method uses the inter-frame difference method and the fixed threshold method to segment moving objects, and its main implementation process is as follows:

[0126] 1 frame difference method

[0127] The so-called inter-frame difference method refers to the method of obtaining the contour of the moving target by performing differential operations on the corresponding pixels in adjacent frames in the video image sequence. The algorithm is implemented as follows:

[0128] pDifImg[i]=abs(pNowImg[i]-pBefImg[i]),i=0...W*H (1)

[0129] In the above formula,

[0130] pDifImg[i]——gray value of frame difference result;

[0131] pNowImg[i]——the gray value of the current f...

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Abstract

The invention discloses a vehicle speed detection method based on a target motion track. The method includes the steps of target segmentation, target tracking conducted on the basis of Kalman filtering and speed calculation, wherein the combination of an inter-frame difference method and a fixed threshold value method is mainly adopted in target segmentation, and a segmentation result is acquired; target tracking conducted on the basis of Kalman filtering is divided into the processes of mass center acquisition, motion model establishment, motion target feature extraction and state vector updating, and therefore the target motion track is acquired; a speed calculation method mainly refers to track related point information acquisition, mapping relation establishment, speed calculation and speed correction, the mapping relation establishment mainly refers to conversion from pixel coordinates in an image to actual distances, in other words, the actual distance, corresponding to an actual coordinate system, of each pixel point in the image is calculated, speed calculation mainly refers to calculation of related information provided by the vehicle track in the mode that the distances are divided by time according to a speed calculation formula and a result is corrected according to the actual condition.

Description

technical field [0001] The invention belongs to the technical field of intelligent transportation, in particular to a vehicle speed detection method based on a target motion track. Background technique [0002] The ubiquitous car speeding problem not only increases the work difficulty of the traffic supervision department, but also the casualty accidents caused by car speeding also happen from time to time. For this reason, it is necessary to detect the driving speed of the vehicle and automatically identify the license plate number, so as to further automate and intelligentize the vehicle management. [0003] To realize traffic intelligence, it is necessary to obtain comprehensive and accurate traffic information, including real-time traffic parameter information such as traffic volume, vehicle speed, and vehicle type. According to these traffic information, traffic accidents can be dealt with in time, and when necessary, guidance information should be sent to guide traffi...

Claims

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Application Information

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IPC IPC(8): G06T7/00G06T7/20
CPCG06T7/215G06T7/251G06T2207/20024
Inventor 袁彬谭中慧于艳玲
Owner CHINA SHIPPING NETWORK TECH
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