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Method and device for detecting vehicle based on state machine

A vehicle detection and state machine technology, which is applied in the field of vehicle detection, can solve the problems of low detection accuracy, failure to consider the drift of environmental geomagnetic signals, and the detection device cannot work stably for a long time, and achieve high detection accuracy, strong anti-interference ability, good robustness

Active Publication Date: 2014-05-14
武汉慧联无限科技有限公司
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  • Application Information

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Problems solved by technology

[0004] In view of the above problems, the object of the present invention is to provide a vehicle detection method and device based on a state machine, aiming to solve the problem that the detection device cannot work stably for a long time because the existing vehicle detection technical scheme does not take into account the influence of environmental geomagnetic signal drift , and the technical problem of low detection accuracy

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  • Method and device for detecting vehicle based on state machine
  • Method and device for detecting vehicle based on state machine
  • Method and device for detecting vehicle based on state machine

Examples

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Embodiment 1

[0024] figure 1 The flow of the vehicle detection method based on the state machine provided by the first embodiment of the present invention is shown, and only the parts related to the embodiment of the present invention are shown for convenience of description.

[0025] Such as figure 1 As shown, the state machine-based vehicle detection method provided in this embodiment includes the following steps:

[0026] Step S101, obtaining the original geomagnetic signal r output by the wireless geomagnetic sensor in real time i (k), and perform sliding window filtering to obtain a smooth geomagnetic signal a i (k).

[0027] In this embodiment, a three-axis geomagnetic sensor is used to detect vehicles. Usually, the three-axis geomagnetic sensor is installed on the road surface or embedded in the road. When a vehicle passes by on the road, the geomagnetic signal changes, and the three-axis geomagnetic sensor collects If the original geomagnetic signal changes, this embodiment det...

Embodiment 2

[0054] image 3 The structure of the vehicle detection device based on the state machine provided by the second embodiment of the present invention is shown, and only the parts related to the embodiment of the present invention are shown for convenience of description.

[0055] The vehicle detection device based on the state machine provided in this embodiment includes:

[0056] The signal acquisition and filtering module 301 is used to acquire the original geomagnetic signal r output by the three-axis geomagnetic sensor in real time i (k), and perform sliding window filtering to obtain a smooth geomagnetic signal a i (k);

[0057] The background environment updating module 302 is used for the current output state of the state machine and the smooth geomagnetic signal a i (k) update the current background environment geomagnetic signal bi(k);

[0058] Binarization processing output module 303, for calculating the smooth geomagnetic signal a i (k) the difference with the b...

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Abstract

The invention belongs to the technical field of vehicle detection, and provides a method and device for detecting a vehicle based on a state machine. The method comprises the steps of acquiring original terrestrial magnetic signals, filtering a sliding window, updating terrestrial magnetic signals of a current background environment, carrying out binarization processing, outputting the state machine, and outputting a vehicle detection event sequence. According to the technical scheme, the terrestrial magnetic signals of the background environment can be updated automatically, the drifting phenomenon that a terrestrial magnetic field is changed along with the environment is eliminated, and due to the adoption of the state machine detection method, vehicle detection accuracy can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of vehicle detection, and in particular relates to a vehicle detection method and device based on a state machine. Background technique [0002] The intelligent traffic system is an effective way to solve the increasingly serious road traffic problems, and the vehicle detection sensor is one of the most important traffic data acquisition devices in the intelligent traffic system. At present, the signal sources of vehicle detection sensors include sound, pressure, geomagnetism, video and so on. Considering factors such as production cost, detection efficiency, and deployment difficulty, vehicle detection based on geomagnetic sensors is relatively ideal and easy to implement. [0003] Traditional vehicle detection solutions based on geomagnetic signal processing often use fixed threshold detection. When the detected geomagnetic signal is greater than the fixed threshold, it is determined that a vehicle is cur...

Claims

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Application Information

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IPC IPC(8): G08G1/042
Inventor 余茂荣
Owner 武汉慧联无限科技有限公司
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