Method and system for expressway video speed measurement based on virtual coils
A virtual coil, highway technology, applied in radio wave measurement systems, devices that measure the time required to move a certain distance, and re-radiation of electromagnetic waves. , Reliable trigger detection performance, change stable effect
Active Publication Date: 2015-01-07
ZHEJIANG LISHI TECH
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[0011] The trigger judgment achieved by using the Gaussian background model can indeed adapt to the effects of slow background changes, for example, it can overcome the interference of sunlight and shadow changes during the day, but it cannot be used for the above-mentioned nighttime car light beam illumination or specific color vehicles. Sudden changes such as reactions still cannot solve the problem of false triggering caused by it
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[0044] In order to enable those skilled in the art to better understand the technical solution of the present invention, and to make the above-mentioned purpose, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the embodiments and accompanying drawings .
[0045] The expressway video speed measuring method and system described in the present invention adopts a speed measuring algorithm based on a virtual coil. In the present invention, the predetermined area in the video screen shot by the speed measuring camera is set as a virtual coil, generally at least two virtual coils are set, and the speed measuring calculation is realized according to the time difference of triggering each virtual coil sequentially by a specific target vehicle.
[0046] The core of the present invention is to improve the trigger detection mechanism of the virtual coil, no longer relying ...
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The invention provides a method and a system for expressway video speed measurement based on virtual coils. The method comprises the following steps: setting at least two preset regions in a video picture shot by a speed measurement camera as virtual coils, and detecting whether a picture formed by a specific target vehicle passes the virtual coils or not; measuring the speed of the vehicle according to time difference that the specific target vehicle sequentially triggers the virtual coils. The core of the invention lies in the improvement over a virtual coil triggering detection mechanism. The stable edge features of a plurality of key regions are adaptively recognized in the virtual coil regions, and the triggering of the virtual coils is realized through the detection of the variation, caused by the specific target vehicle, of the inner edge features of the virtual coil regions. As the stable edge features have strong robustness relative to the gradual change and the sudden change of external environment factors such as sun exposure, shadow and vehicle light radiation, error triggering caused by external interference can be effectively avoided. The reliable, accurate and high-real-timeliness virtual coil triggering detection mechanism is built.
Description
technical field [0001] The present invention relates to the technical field of expressway speed measurement, and more specifically, to a method and system for expressway video speed measurement based on a virtual coil. Background technique [0002] The traditional expressway overspeed monitoring adopts ground induction coil speed measurement, laser speed measurement and radar speed measurement. The above three speed measurement methods all have their own shortcomings. Ground induction coil speed measurement is to bury a pair of coils with vehicle passing induction ability on the road surface in advance, record the time when the target vehicle passes through the two coils successively, and then calculate the speed according to the time difference and the distance between the coils. However, the installation of the ground induction coil will damage the road surface of the expressway, and the accuracy of speed measurement for vehicles traveling along a non-linear trajectory is...
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IPC IPC(8): G01P3/68
Inventor 陈海江蓝天翔詹常青李艳
Owner ZHEJIANG LISHI TECH