Video-based vehicle speed detecting method
A technology of vehicle speed and detection method, applied in the traffic control system of road vehicles, the use of devices that measure the time required to move a certain distance, the re-radiation of electromagnetic waves, etc., can solve the lack of in-depth research, electrical noise interference, problems can not be obtained Solve other problems to achieve the effect of broad application prospects, short detection time and easy implementation
Inactive Publication Date: 2014-04-30
CHANGAN UNIV
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[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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[0022] The principle adopted in the video-based vehicle speed detection method of the present invention is to process the collected video into a grayscale image sequence of a certain format and size. The color of a moving car is basically unchanged in a short period of time, so the gray value of each point on the car body is also basically unchanged. The color of the environment or background when the vehicle is moving The gray value of each point in the background environment is also basically unchanged, so when the vehicle moves in a certain background environment, the gray value between adjacent frames and between each frame and the background has a certain Differences, the distance moved by these gray level differences is similar to the distance moved by the vehicle. Knowing the moving distance of the car paves the way for the detection of the speed, and then uses mathematical methods to fit the obtained data results, and finally achieves the purpose of detecting the speed...
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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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IPC IPC(8): G08G1/052G06K9/00G01P3/68
Inventor 宋焕生张辉付洋李洁朱小平陈艳刘雪琴杨孟拓
Owner CHANGAN UNIV