Video-based vehicle speed detecting method

Abstract

The invention discloses a video-based vehicle speed detecting method, which includes the steps: firstly, acquiring a traffic road video, and preprocessing the video to obtain an image sequence with the pixel of 720X288 and only including gray-value information; secondly, selecting a vehicle tracking area of 2X8X90 in images, and extracting an image projection sequence from the nine-frame continuous images; thirdly, extracting the image projection sequence by a frame difference method and selecting characteristic values of the sequence, and obtaining positions of characteristic value points in a practical road by using the two-dimensional mapping relation (the relation from point to distance) in a mapping table; and finally, establishing a curve graph of the relation of the characteristic value points of the practical positions with time, and fitting vehicle speed with a least square method. Compared with the prior art, the video-based vehicle speed detecting method can be used for detecting the speed of all vehicles in the video range without being limited by the environment and judging the video in real time, and is short in detecting time, easy in implementation, high in accuracy and wide in application prospect.

Description

technical field [0001] The invention belongs to the technical field of video traffic detection, in particular to a vehicle speed detection method based on traffic video. It is mainly used for data collection of road traffic information by the traffic supervision department, which can meet the requirements of the traffic supervision department for real-time data, accuracy and detection accuracy. Background technique [0002] Vehicle speed detection refers to the detection and data recording of the speed of vehicles on the road through certain detection equipment, and to determine whether the speed of the vehicle is within the specified speed, so as to monitor whether the vehicle has overspeed behavior. At present, there are common problems of automobile driving violations in the traffic system, such as the phenomenon of speeding vehicles. This kind of behavior is very dangerous. It not only increases the difficulty of the work of the traffic supervision department, but also e...

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Problems solved by technology

[0003] The traditional vehicle speed detection method is mainly the loop coil method, etc. This method is limited by the fact that the coil must be fixed. If the road reconstruction needs to re-lay the coil, the installation and operation are not flexible; secondly, it cannot deal with mechanical noise interference, electrical noise, etc. Interference, strong magnetic interference, etc., and many long-term accumulated problems cannot be solved, lack of in-depth research

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