CN111311927A - Traffic flow detection method and device, computer equipment and storage medium - Google Patents
Traffic flow detection method and device, computer equipment and storage medium Download PDFInfo
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- CN111311927A CN111311927A CN202010050559.0A CN202010050559A CN111311927A CN 111311927 A CN111311927 A CN 111311927A CN 202010050559 A CN202010050559 A CN 202010050559A CN 111311927 A CN111311927 A CN 111311927A
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/042—Detecting movement of traffic to be counted or controlled using inductive or magnetic detectors
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/0104—Measuring and analyzing of parameters relative to traffic conditions
- G08G1/0125—Traffic data processing
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/01—Detecting movement of traffic to be counted or controlled
- G08G1/0104—Measuring and analyzing of parameters relative to traffic conditions
- G08G1/0137—Measuring and analyzing of parameters relative to traffic conditions for specific applications
Abstract
The invention relates to a method, a device, computer equipment and a storage medium for detecting vehicle flow, wherein the method comprises the steps of obtaining a detection baseline and a detection threshold; initializing a traffic flow numerical value corresponding to a detection area covered by the geomagnetic sensor; acquiring detection data from a geomagnetic sensor to obtain initial data; preprocessing the initial data to obtain target data; judging whether a vehicle passes through a detection area covered by the geomagnetic sensor according to the target data; if vehicles pass through the detection area covered by the geomagnetic sensor, updating the corresponding traffic flow value; counting the traffic flow numerical value to form a statistical result; and feeding back the statistical result to the terminal for reference of flow scheduling. The geomagnetic sensor is high in reliability, small in limitation and low in cost, and the problems that the cost is high in the traditional vehicle detection scheme and the requirements for reliability and safety in scenes with complicated and changeable traffic conditions are difficult to meet are solved.
Description
Technical Field
The invention relates to a vehicle detection method, in particular to a vehicle flow detection method, a vehicle flow detection device, a computer device and a storage medium.
Background
The intelligent traffic system is the development direction of future traffic systems, and the traffic flow detection system is used for collecting traffic flow, is an indispensable part of the intelligent traffic system and provides basic traffic data for the intelligent traffic system. After the intelligent traffic system acquires the traffic flow information, traffic accident analysis can be performed, traffic jam is relieved, and traffic efficiency and traffic safety level are improved. On the other hand, in the near future, the 5G network will promote the development of automatic driving, which can improve the driving experience and the travel efficiency. While data transmission technology is rapidly developing, ITS also requires the collection of more valuable data of complex dynamics in the traffic system; at present, the main vehicle detection technologies at home and abroad are divided into pneumatic guide tubes, ground induction coils, piezoelectric sensors, video detectors, microwave radar detectors and infrared detector technologies.
The pneumatic conduit is fast to install and low in power consumption, is frequently used in short-term research of vehicle flow, and is characterized in that a long rubber tube is installed on a road surface perpendicular to the vehicle flow direction, so long as a vehicle passes through the road surface where the long rubber tube is installed, the conduit can be pressed, air flow is generated to close an air switch in a system, and an electric signal is triggered.
The ground induction coil technology is the most mature among the traffic flow detection scheme, and the use amount is the biggest, and it is installed in the road surface below, detects because the coil inductance value change that the vehicle process leads to judge the process of vehicle, and then calculate the vehicle flow, but this kind of mode is unfavorable for when environment such as freezing, saline and alkaline, and the maintenance work volume of coil is big, and the installation is complicated.
The piezoelectric sensor is installed in a similar way to a ground induction coil, and the scheme adopts a quartz material which generates voltage when mechanical impact or vibration is applied, and a system can judge that a vehicle passes by detecting the voltage, so that traffic flow data can be obtained.
The video detector obtains traffic flow information by shooting videos or pictures and analyzing the videos or pictures by using a camera, but is easily influenced by environmental factors such as shadows and rainwater, and is high in large-scale deployment cost.
Microwave radar detectors use the doppler effect, which transmits a microwave beam towards a roadway detection zone, the reflected microwave beam returning at a different frequency as the vehicle passes. By detecting the frequency shift, the detector can determine the passing of the vehicle, but the installation and debugging requirements of the scheme are too high to accurately distinguish pedestrians from vehicles in urban roads.
The principle of the ultrasonic detector is similar to that of a microwave radar, the ultrasonic detector transmits ultrasonic waves and receives reflected waves reflected from a vehicle or the ground, and the time difference between the transmission of the ultrasonic waves and the reception of the reflected waves is compared to obtain the distance between the ultrasonic detector and an obstacle, so that whether the vehicle passes through is judged, but the cost is high, the detection precision is poor when the road surface congestion is serious, and the detection precision is also easily influenced by environmental factors such as air temperature, air flow and the like.
The infrared detector is mainly divided into an active type and a passive type, wherein the active type is provided with an infrared light source, a vehicle in a detection area reflects infrared light to the detector to generate a sensing signal, and the passive type judges whether a vehicle passes through by detecting the infrared radiation intensity of a road surface when the vehicle does not pass through and the change of the infrared radiation intensity when the vehicle passes through. But is influenced by environmental factors such as dust, ice fog and the like, and has high installation cost and high requirement on installation environment.
Therefore, it is necessary to design a new method to solve the problems of high cost and difficulty in meeting the reliability and safety requirements in the scenes with complicated and variable traffic conditions in the conventional vehicle detection scheme.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a traffic flow detection method, a traffic flow detection device, computer equipment and a storage medium.
In order to achieve the purpose, the invention adopts the following technical scheme: the traffic flow detection method comprises the following steps:
acquiring a detection baseline and a detection threshold;
initializing a traffic flow numerical value corresponding to a detection area covered by the geomagnetic sensor;
acquiring detection data from a geomagnetic sensor to obtain initial data;
preprocessing the initial data to obtain target data;
judging whether a vehicle passes through a detection area covered by the geomagnetic sensor according to the target data;
if vehicles pass through the detection area covered by the geomagnetic sensor, updating the corresponding traffic flow value;
counting the traffic flow numerical value to form a statistical result;
and feeding back the statistical result to the terminal for reference of flow scheduling.
The further technical scheme is as follows: the acquiring a detection baseline and a detection threshold comprises:
when no vehicle passes through a detection area covered by the geomagnetic sensor, acquiring data of the started geomagnetic sensor;
preprocessing data of the geomagnetic sensor to obtain test data;
averaging the test data to form a detection baseline;
subtracting a value from the detection baseline to obtain a detection threshold.
The further technical scheme is as follows: the preprocessing the initial data to obtain target data comprises:
and filtering the initial data to obtain target data.
The further technical scheme is as follows: the judging whether a vehicle passes through in the detection area covered by the geomagnetic sensor according to the target data includes:
judging whether a vehicle enters a detection area covered by the geomagnetic sensor or not according to the target data;
if a vehicle enters a detection area covered by the geomagnetic sensor, acquiring detection data from the geomagnetic sensor again, and filtering the detection data to obtain leaving detection data;
judging whether a vehicle leaves a detection area covered by the geomagnetic sensor or not according to the leaving detection data;
if the vehicle leaves the detection area covered by the geomagnetic sensor, the vehicle passes through the detection area covered by the geomagnetic sensor.
The further technical scheme is as follows: the judging whether a vehicle enters a detection area covered by the geomagnetic sensor according to the target data includes:
judging whether the target data is not less than a detection threshold value;
if the target data is not smaller than the detection threshold, no vehicle enters a detection area covered by the geomagnetic sensor;
and if the target data are smaller than the detection threshold value, a vehicle enters a detection area covered by the geomagnetic sensor.
The further technical scheme is as follows: before the vehicle enters the detection area covered by the geomagnetic sensor, the method further includes:
randomly selecting a plurality of target data, and calculating the variance of the plurality of target data to obtain a variance value;
judging whether a plurality of randomly selected target data are not less than a detection threshold value and the variance value is not more than a preset variance threshold value;
if the randomly selected target data are not smaller than the detection threshold and the variance value is not larger than the preset variance threshold, calculating the average value of the randomly selected target data to obtain a target average value, updating the detection baseline and the detection threshold according to the target average value, and executing the detection that no vehicle enters the detection area covered by the geomagnetic sensor;
if the plurality of randomly selected target data are not satisfied and are not less than the detection threshold or the variance value is greater than the preset variance threshold, discarding the plurality of randomly selected target data, and executing the detection area covered by the geomagnetic sensor when no vehicle enters the geomagnetic sensor.
The further technical scheme is as follows: the determining whether there is a vehicle leaving a detection area covered by the geomagnetic sensor according to the leaving detection data includes:
obtaining the quantity which is not less than the detection threshold value in the leaving detection data to obtain the quantity to be judged;
judging whether the number to be judged is smaller than a preset threshold value or not;
if the number to be judged is smaller than a preset threshold value, no vehicle leaves a detection area covered by the geomagnetic sensor;
and if the number to be judged is not less than the preset threshold value, a vehicle leaves the detection area covered by the geomagnetic sensor.
The present invention also provides a traffic flow detection device, including:
a reference quantity acquisition unit for acquiring a detection baseline and a detection threshold;
the initialization unit is used for initializing a traffic flow numerical value corresponding to a detection area covered by the geomagnetic sensor;
a data acquisition unit for acquiring detection data from the geomagnetic sensor to obtain initial data;
the preprocessing unit is used for preprocessing the initial data to obtain target data;
the judging unit is used for judging whether a vehicle passes through a detection area covered by the geomagnetic sensor according to the target data;
the updating unit is used for updating the corresponding traffic flow value if vehicles pass through the detection area covered by the geomagnetic sensor;
the statistical unit is used for carrying out statistics on the traffic flow numerical value to form a statistical result;
and the feedback unit is used for feeding back the statistical result to the terminal for reference of flow scheduling.
The invention also provides computer equipment which comprises a memory and a processor, wherein the memory is stored with a computer program, and the processor realizes the method when executing the computer program.
The invention also provides a storage medium storing a computer program which, when executed by a processor, is operable to carry out the method as described above.
Compared with the prior art, the invention has the beneficial effects that: the invention carries out the detection of the entering and leaving of the vehicle through the geomagnetic sensor deployed on the road, firstly determines a detection baseline and a detection threshold according to the data uploaded by the geomagnetic sensor, then carries out the pre-processed target data according to the initial data of the geomagnetic sensor acquired in real time, judges that the vehicle enters and leaves the detection area covered by the geomagnetic sensor by combining the detection baseline and the detection threshold, updates the statistical result according to the judgment result to be used as a dispatching reference value, adopts the geomagnetic sensor with high reliability, small limitation and low cost, and solves the problems that the cost is higher in the traditional vehicle detection scheme and the reliability and safety requirements in the scene with complicated and changeable traffic conditions are difficult to meet.
The invention is further described below with reference to the accompanying drawings and specific embodiments.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic view of an application scenario of a traffic flow detection method according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a traffic flow detection method according to an embodiment of the present invention;
fig. 3 is a schematic sub-flow chart of a traffic flow detection method according to an embodiment of the present invention;
fig. 4 is a schematic sub-flow chart of a traffic flow detection method according to an embodiment of the present invention;
fig. 5 is a schematic sub-flow chart of a traffic flow detection method according to an embodiment of the present invention;
fig. 6 is a schematic sub-flow chart of a traffic flow detection method according to an embodiment of the present invention;
fig. 7 is a schematic block diagram of a traffic flow detection device according to an embodiment of the present invention;
FIG. 8 is a schematic block diagram of a computer device provided by an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
Referring to fig. 1 and fig. 2, fig. 1 is a schematic view of an application scenario of a traffic flow detection method according to an embodiment of the present invention. Fig. 2 is a schematic flow chart of a traffic flow detection method according to an embodiment of the present invention. The traffic flow detection method is applied to a server. The server performs data interaction with the terminal and the geomagnetic sensor, acquires detection data from the geomagnetic sensor, preprocesses the detection data, judges whether vehicles pass through a detection area or not, updates a count value if the vehicles pass through the detection area, and sends the count value to the terminal for display, so that an operator can perform traffic scheduling and control according to a display result.
Fig. 2 is a schematic flow chart of a traffic flow detection method according to an embodiment of the present invention. As shown in fig. 2, the method includes the following steps S110 to S180.
And S110, acquiring a detection baseline and a detection threshold.
In the present embodiment, the detection baseline is used to represent a data mean value detected by the geomagnetic sensor when no vehicle passes through the detection area; the detection threshold value is a value that still belongs to a range where no vehicle passes through, and is similar to an error or the like.
In an embodiment, referring to fig. 3, the step S110 may include steps S111 to S114.
And S111, when no vehicle passes through the detection area covered by the geomagnetic sensor, acquiring data of the started geomagnetic sensor.
In the embodiment, a geomagnetic sensor is used for detecting a geomagnetic signal, the sensor is arranged beside a road and can collect the geomagnetic signal, and if a vehicle passes through a sensing range of the geomagnetic sensor, namely a detection area, output data of the geomagnetic sensor changes; in the present embodiment, the detected traffic flow is a traffic flow of a single lane, and if the traffic flow is a traffic flow of multiple lanes, it is necessary to deploy multiple sets of geomagnetic sensors and controllers. According to the requirements of a detection area, the geomagnetic sensor and the server are deployed beside a road needing to detect traffic flow, when the method is used, the system needs to be started when no vehicle passes through the detection area, and the system can obtain initial data, namely a detection baseline and a detection threshold Th conveniently.
In this embodiment, the detection area refers to an area covered by a wavelength band emitted by the geomagnetic sensor.
And S112, preprocessing the data of the geomagnetic sensor to obtain test data.
In the present embodiment, the test data is data obtained by filtering detection data obtained when no vehicle passes through a detection area covered by the geomagnetic sensor.
S113, averaging the test data to form a detection baseline;
and S114, subtracting a numerical value from the detection baseline to obtain a detection threshold value.
When no vehicle passes through the detection range of the sensor, the geomagnetic sensor is started, the server calculates the mean value of the test data formed after preprocessing the data of the magnetic sensor to obtain a detection baseline, a value is subtracted from the detection baseline to obtain a detection threshold, factors such as environmental influences and the like which cause the change of the data detected by the geomagnetic sensor are also taken into consideration to form the detection baseline and the detection threshold, and therefore the accuracy of later-stage vehicle flow detection is improved.
And S120, initializing a traffic flow numerical value corresponding to the detection area covered by the geomagnetic sensor.
In this embodiment, each detection area covered by each geomagnetic sensor has a corresponding traffic flow value, so that the traffic flow detection results within a certain range can be collected in a later period in an integrated manner.
And S130, acquiring detection data from the geomagnetic sensor to obtain initial data.
In the present embodiment, the initial data refers to data detected from the geomagnetic sensor.
And S140, preprocessing the initial data to obtain target data.
In this embodiment, the target data refers to data formed by filtering the initial data.
Specifically, the initial data is filtered to obtain target data, noise interference is avoided, and the accuracy of traffic flow detection is improved.
And S150, judging whether vehicles pass through the detection area covered by the geomagnetic sensor according to the target data.
The vehicles are counted by judging the arrival and departure of the vehicles, and the traffic flow is obtained.
In an embodiment, referring to fig. 4, the step S150 may include steps S151 to S155.
And S151, judging whether a vehicle enters a detection area covered by the geomagnetic sensor or not according to the target data.
In an embodiment, referring to fig. 5, the step S151 may include steps S1511 to S1516.
S1511, judging whether the target data is not less than a detection threshold;
s1512, if the target data is not smaller than the detection threshold, randomly selecting a plurality of target data, and calculating the variance of the plurality of target data to obtain a variance value;
s1513, judging whether the randomly selected target data are not less than the detection threshold and the variance value is not greater than the preset variance threshold;
s1514, if the randomly selected target data are not smaller than a detection threshold value and the variance value is not larger than a preset variance threshold value, calculating an average value of the randomly selected target data to obtain a target average value, and updating the detection baseline and the detection threshold value according to the target average value, wherein no vehicle enters a detection area covered by the geomagnetic sensor;
s1515, if the randomly selected target data are not satisfied and are not less than the detection threshold or the variance value is greater than the preset variance threshold, discarding the randomly selected target data, and no vehicle enters the detection area covered by the geomagnetic sensor;
and S1516, if the target data is smaller than the detection threshold, the vehicle enters the detection area covered by the geomagnetic sensor.
If the target data is not less than the detection threshold Th, namely the fluctuation does not exceed the detection threshold Th, M preprocessed target data are taken for calculation, if the M target data are not less than the detection threshold Th and the variance of the M target data is not more than a set variance threshold Th1, no vehicle passes through at the moment, the M preprocessed target data are collected to calculate the mean value and update the detection baseline, and the detection baseline and the detection threshold Th under the current environment are measured in real time, so that the accuracy of the whole vehicle flow detection is improved.
If the M target data do not meet the conditions that the M target data are all smaller than the detection threshold Th and the variance is not larger than Th1, discarding the M target data and continuously collecting the preprocessed target data;
of course, in another embodiment, in step S1516, before the vehicle enters the detection area covered by the geomagnetic sensor, the method further includes randomly selecting a plurality of target data, and when the number of the randomly selected target data smaller than the detection threshold is smaller than a certain value, it indicates that the vehicle enters the detection area covered by the geomagnetic sensor.
That is, if the target data is smaller than the detection threshold Th, N1 preprocessed target data are taken, and if N1 preprocessed target data are smaller than the detection threshold Th, the vehicle is considered to arrive.
S152, if no vehicle enters the detection area covered by the geomagnetic sensor, no vehicle passes through the detection area covered by the geomagnetic sensor;
and S153, if the vehicle enters the detection area covered by the geomagnetic sensor, acquiring the detection data from the geomagnetic sensor again, and filtering the detection data to obtain the departure detection data.
The vehicle leaving judgment is carried out only when the vehicle enters the detection area, so that the calculation amount of the server can be reduced, the whole detection efficiency is improved, and the whole detection accuracy can be improved.
S154, judging whether a vehicle leaves a detection area covered by the geomagnetic sensor or not according to the leaving detection data;
in an embodiment, referring to fig. 6, the step S154 may include steps S1541 to S1544.
S1541, acquiring the quantity which is not less than a detection threshold value in the leaving detection data to obtain a quantity to be judged;
s1542, judging whether the number to be judged is smaller than a preset threshold value;
s1543, if the number to be judged is smaller than a preset threshold value, no vehicle leaves a detection area covered by the geomagnetic sensor;
s1544, if the number to be judged is not smaller than a preset threshold value, a vehicle leaves a detection area covered by the geomagnetic sensor.
And collecting the preprocessed leaving detection data transmitted by the geomagnetic sensor again, and if the collected leaving detection data is larger than the detection threshold, judging by taking N2 leaving detection data. If the number of N2 pieces of departure detection data not less than the detection threshold Th is less than the preset threshold N2, it is considered that the fluctuation of the magnetic flux is caused by the disturbance. That is, the vehicle does not leave the detection range of the geomagnetic sensor. If the number of N2 departure detection data not less than the detection threshold Th is not less than the preset threshold N2, it is determined that the vehicle has departed, and a transition is made from the detection state to the vehicle departure state. The vehicle is counted in the vehicle leaving state.
The above mentioned parameters M, Th1, N1, N1, N2, and N2 may be set according to the actual traffic environment, and the parameters corresponding to different environments may be different.
And S155, if the vehicle leaves the detection area covered by the geomagnetic sensor, the vehicle passes through the detection area covered by the geomagnetic sensor.
If there is a vehicle leaving the detection area covered by the geomagnetic sensor, the step S153 is executed.
When the vehicle passes through the detection area, the change of the magnetic flux in the induction range of the geomagnetic sensor is caused. The change of the magnetic flux is reflected as the change of the output data of the geomagnetic sensor by the geomagnetic sensor, and the output data is sent to a server for data processing.
And S160, if vehicles pass through the detection area covered by the geomagnetic sensor, updating the corresponding traffic flow value.
And S170, counting the traffic flow numerical value to form a statistical result.
In this embodiment, the statistical result refers to the sum of all traffic flow values in a certain detection area.
And S180, feeding back the statistical result to the terminal for reference of flow scheduling.
If the detection area covered by the geomagnetic sensor does not pass by the vehicle, the acquisition of the detection data from the geomagnetic sensor is performed to form initial data.
After the counting of the vehicles is finished, the traffic flow detection results collected by the group of geomagnetic sensors are integrated for managing the vehicles on the road. Based on the traffic flow results, the road manager may issue traffic flow scheduling commands to control the traffic flow.
The traffic flow detection method based on the geomagnetic sensor collects traffic flow information in a traffic environment, and further promotes the rapid development of ITS and automatic driving; the geomagnetic sensor deployed beside the road can accurately and timely detect the traffic flow, and can provide the optimal driving path for the vehicle, thereby improving the road intelligence level. Compared with other detection methods, the method has the following advantages: the reliability is high, the limitation is small, the cost is low, a high-precision traffic flow detection technology can be realized aiming at a complex traffic environment, and the installation cost is low; is little influenced by environmental factors. Rain or haze weather still can normally work, can not influenced by weather conditions, and environmental factor does not have the reaction to non-ferromagnetic object to the little geomagnetic sensor of traffic flow detection performance influence, consequently can effectively reduce the interference.
According to the traffic flow detection method, the geomagnetic sensor deployed on the road is used for detecting the entrance and the exit of the vehicle, the detection baseline and the detection threshold are determined according to data uploaded by the geomagnetic sensor, the target data obtained through preprocessing according to initial data of the geomagnetic sensor acquired in real time are combined with the detection baseline and the detection threshold to judge the entrance and the exit of the vehicle to and from the detection area covered by the geomagnetic sensor, and the statistical result is updated according to the judgment result to serve as the dispatching reference value.
Fig. 7 is a schematic block diagram of a traffic flow detection device 300 according to an embodiment of the present invention. As shown in fig. 7, the present invention also provides a traffic flow detecting device 300 corresponding to the above traffic flow detecting method. The traffic flow detection device 300 includes means for executing the above-described traffic flow detection method, and the device may be configured in a server. Specifically, referring to fig. 7, the traffic flow detecting device 300 includes a reference quantity acquiring unit 301, an initializing unit 302, a data acquiring unit 303, a preprocessing unit 304, a determining unit 305, an updating unit 306, a counting unit 307, and a feedback unit 308.
A reference amount acquisition unit 301 configured to acquire a detection baseline and a detection threshold; an initialization unit 302, configured to initialize a traffic flow value corresponding to a detection area covered by the geomagnetic sensor; a data acquisition unit 303 configured to acquire detection data from the geomagnetic sensor to obtain initial data; a preprocessing unit 304, configured to preprocess the initial data to obtain target data; a determination unit 305 configured to determine whether a vehicle passes through a detection area covered by the geomagnetic sensor based on the target data; an updating unit 306, configured to update a corresponding traffic flow value if a vehicle passes through a detection area covered by the geomagnetic sensor; a statistical unit 307, configured to perform statistics on the traffic flow value to form a statistical result; a feedback unit 308, configured to feedback the statistical result to the terminal for reference in traffic scheduling.
In one embodiment, the reference amount acquiring unit 301 includes a preliminary acquiring subunit, a processing subunit, a mean acquiring subunit, and a baseline processing subunit.
A preliminary acquisition subunit, configured to acquire data of a started geomagnetic sensor when no vehicle passes through a detection area covered by the geomagnetic sensor; the processing subunit is used for preprocessing the data of the geomagnetic sensor to obtain test data; the mean value obtaining subunit is used for averaging the test data to form a detection baseline; and the baseline processing subunit is used for subtracting a numerical value from the detection baseline to obtain a detection threshold value.
In one embodiment, the determining unit 305 includes an entering determining subunit, a data re-acquiring subunit, and an exiting determining subunit.
An entry judgment subunit, configured to judge, according to the target data, whether a vehicle enters a detection area covered by the geomagnetic sensor; a data re-acquisition subunit, configured to re-acquire detection data from the geomagnetic sensor if a vehicle enters a detection area covered by the geomagnetic sensor, and perform filtering processing on the detection data to obtain departure detection data; a departure judging subunit, configured to judge whether a vehicle departs from a detection area covered by the geomagnetic sensor according to the departure detection data; if the vehicle leaves the detection area covered by the geomagnetic sensor, the vehicle passes through the detection area covered by the geomagnetic sensor.
In an embodiment, the data re-acquisition subunit includes a first determining module, a first selecting module, a second determining module, a baseline updating module, and a data discarding module.
The first judgment module is used for judging whether the target data is not less than a detection threshold value; if the target data are smaller than the detection threshold value, a vehicle enters a detection area covered by the geomagnetic sensor; the first selection module is used for randomly selecting a plurality of target data and calculating the variance of the plurality of target data to obtain a variance value if the target data is not smaller than a detection threshold; the second judgment module is used for judging whether the randomly selected target data are not less than the detection threshold and the variance value is not greater than the preset variance threshold; the base line updating module is used for calculating the average value of the plurality of randomly selected target data to obtain a target average value if the plurality of randomly selected target data are not smaller than a detection threshold value and the variance value is not larger than a preset variance threshold value, updating the detection base line and the detection threshold value according to the target average value, and executing the detection that no vehicle enters the detection area covered by the geomagnetic sensor; and the data discarding module is used for discarding the randomly selected target data and executing the detection that no vehicle enters the detection area covered by the geomagnetic sensor if the randomly selected target data are not satisfied and are not less than the detection threshold or the variance value is greater than a preset variance threshold.
In an embodiment, the departure determination subunit includes a quantity obtaining module and a quantity determining module.
The quantity obtaining module is used for obtaining the quantity which is not less than the detection threshold value in the leaving detection data so as to obtain the quantity to be judged; the quantity judging module is used for judging whether the quantity to be judged is smaller than a preset threshold value or not; if the number to be judged is smaller than a preset threshold value, no vehicle leaves a detection area covered by the geomagnetic sensor; and if the number to be judged is not less than the preset threshold value, a vehicle leaves the detection area covered by the geomagnetic sensor.
It should be noted that, as can be clearly understood by those skilled in the art, for the specific implementation process of the traffic flow detecting device 300 and each unit, reference may be made to the corresponding description in the foregoing method embodiment, and for convenience and brevity of description, no further description is provided herein.
The traffic flow detecting device 300 may be implemented in the form of a computer program that can be run on a computer apparatus as shown in fig. 8.
Referring to fig. 8, fig. 8 is a schematic block diagram of a computer device according to an embodiment of the present application. The computer device 500 is a server, wherein the server may be an independent server or a server cluster composed of a plurality of servers.
Referring to fig. 8, the computer device 500 includes a processor 502, memory, and a network interface 505 connected by a system bus 501, where the memory may include a non-volatile storage medium 503 and an internal memory 504.
The non-volatile storage medium 503 may store an operating system 5031 and a computer program 5032. The computer programs 5032 include program instructions that, when executed, cause the processor 502 to perform a method of traffic flow detection.
The processor 502 is used to provide computing and control capabilities to support the operation of the overall computer device 500.
The internal memory 504 provides an environment for running the computer program 5032 in the non-volatile storage medium 503, and when the computer program 5032 is executed by the processor 502, the processor 502 can be caused to execute a traffic flow detection method.
The network interface 505 is used for network communication with other devices. Those skilled in the art will appreciate that the configuration shown in fig. 8 is a block diagram of only a portion of the configuration relevant to the present teachings and does not constitute a limitation on the computer device 500 to which the present teachings may be applied, and that a particular computer device 500 may include more or less components than those shown, or combine certain components, or have a different arrangement of components.
Wherein the processor 502 is configured to run the computer program 5032 stored in the memory to implement the following steps:
acquiring a detection baseline and a detection threshold; initializing a traffic flow numerical value corresponding to a detection area covered by the geomagnetic sensor; acquiring detection data from a geomagnetic sensor to obtain initial data; preprocessing the initial data to obtain target data; judging whether a vehicle passes through a detection area covered by the geomagnetic sensor according to the target data; if vehicles pass through the detection area covered by the geomagnetic sensor, updating the corresponding traffic flow value; counting the traffic flow numerical value to form a statistical result; and feeding back the statistical result to the terminal for reference of flow scheduling.
In an embodiment, when the processor 502 implements the step of obtaining the detection baseline and the detection threshold, the following steps are specifically implemented:
when no vehicle passes through a detection area covered by the geomagnetic sensor, acquiring data of the started geomagnetic sensor; preprocessing data of the geomagnetic sensor to obtain test data; averaging the test data to form a detection baseline; subtracting a value from the detection baseline to obtain a detection threshold.
In an embodiment, when the processor 502 implements the step of preprocessing the initial data to obtain the target data, the following steps are specifically implemented:
and filtering the initial data to obtain target data.
In an embodiment, when the step of determining whether a vehicle passes through the detection area covered by the geomagnetic sensor according to the target data is implemented by the processor 502, the following steps are specifically implemented:
judging whether a vehicle enters a detection area covered by the geomagnetic sensor or not according to the target data; if a vehicle enters a detection area covered by the geomagnetic sensor, acquiring detection data from the geomagnetic sensor again, and filtering the detection data to obtain leaving detection data; judging whether a vehicle leaves a detection area covered by the geomagnetic sensor or not according to the leaving detection data; if the vehicle leaves the detection area covered by the geomagnetic sensor, the vehicle passes through the detection area covered by the geomagnetic sensor.
In an embodiment, when the step of determining whether a vehicle enters the detection area covered by the geomagnetic sensor according to the target data is implemented, the processor 502 specifically implements the following steps:
judging whether the target data is not less than a detection threshold value; if the target data is not smaller than the detection threshold, no vehicle enters a detection area covered by the geomagnetic sensor; and if the target data are smaller than the detection threshold value, a vehicle enters a detection area covered by the geomagnetic sensor.
In an embodiment, before the step of implementing that no vehicle enters the detection area covered by the geomagnetic sensor, the processor 502 further implements the following steps:
randomly selecting a plurality of target data, and calculating the variance of the plurality of target data to obtain a variance value; judging whether a plurality of randomly selected target data are not less than a detection threshold value and the variance value is not more than a preset variance threshold value; if the randomly selected target data are not smaller than the detection threshold and the variance value is not larger than the preset variance threshold, calculating the average value of the randomly selected target data to obtain a target average value, updating the detection baseline and the detection threshold according to the target average value, and executing the detection that no vehicle enters the detection area covered by the geomagnetic sensor; if the plurality of randomly selected target data are not satisfied and are not less than the detection threshold or the variance value is greater than the preset variance threshold, discarding the plurality of randomly selected target data, and executing the detection area covered by the geomagnetic sensor when no vehicle enters the geomagnetic sensor.
In an embodiment, when the step of determining whether the vehicle leaves the detection area covered by the geomagnetic sensor according to the leaving detection data is implemented by the processor 502, the following steps are specifically implemented:
obtaining the quantity which is not less than the detection threshold value in the leaving detection data to obtain the quantity to be judged; judging whether the number to be judged is smaller than a preset threshold value or not; if the number to be judged is smaller than a preset threshold value, no vehicle leaves a detection area covered by the geomagnetic sensor; and if the number to be judged is not less than the preset threshold value, a vehicle leaves the detection area covered by the geomagnetic sensor.
It should be understood that, in the embodiment of the present Application, the Processor 502 may be a Central Processing Unit (CPU), and the Processor 502 may also be other general-purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field-Programmable Gate arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components, and the like. Wherein a general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
It will be understood by those skilled in the art that all or part of the flow of the method implementing the above embodiments may be implemented by a computer program instructing associated hardware. The computer program includes program instructions, and the computer program may be stored in a storage medium, which is a computer-readable storage medium. The program instructions are executed by at least one processor in the computer system to implement the flow steps of the embodiments of the method described above.
Accordingly, the present invention also provides a storage medium. The storage medium may be a computer-readable storage medium. The storage medium stores a computer program, wherein the computer program, when executed by a processor, causes the processor to perform the steps of:
acquiring a detection baseline and a detection threshold; initializing a traffic flow numerical value corresponding to a detection area covered by the geomagnetic sensor; acquiring detection data from a geomagnetic sensor to obtain initial data; preprocessing the initial data to obtain target data; judging whether a vehicle passes through a detection area covered by the geomagnetic sensor according to the target data; if vehicles pass through the detection area covered by the geomagnetic sensor, updating the corresponding traffic flow value; counting the traffic flow numerical value to form a statistical result; and feeding back the statistical result to the terminal for reference of flow scheduling.
In an embodiment, when the processor executes the computer program to implement the step of obtaining the detection baseline and the detection threshold, the following steps are specifically implemented:
when no vehicle passes through a detection area covered by the geomagnetic sensor, acquiring data of the started geomagnetic sensor; preprocessing data of the geomagnetic sensor to obtain test data; averaging the test data to form a detection baseline; subtracting a value from the detection baseline to obtain a detection threshold.
In an embodiment, when the processor executes the computer program to implement the step of preprocessing the initial data to obtain the target data, the following steps are specifically implemented:
and filtering the initial data to obtain target data.
In an embodiment, when the processor executes the computer program to implement the step of determining whether a vehicle passes through a detection area covered by the geomagnetic sensor according to the target data, the processor specifically implements the following steps:
judging whether a vehicle enters a detection area covered by the geomagnetic sensor or not according to the target data; if a vehicle enters a detection area covered by the geomagnetic sensor, acquiring detection data from the geomagnetic sensor again, and filtering the detection data to obtain leaving detection data; judging whether a vehicle leaves a detection area covered by the geomagnetic sensor or not according to the leaving detection data; if the vehicle leaves the detection area covered by the geomagnetic sensor, the vehicle passes through the detection area covered by the geomagnetic sensor.
In an embodiment, when the processor executes the computer program to implement the step of determining whether a vehicle enters a detection area covered by the geomagnetic sensor according to the target data, the processor specifically implements the following steps:
judging whether the target data is not less than a detection threshold value; if the target data is not smaller than the detection threshold, no vehicle enters a detection area covered by the geomagnetic sensor; and if the target data are smaller than the detection threshold value, a vehicle enters a detection area covered by the geomagnetic sensor.
In an embodiment, before the step of executing the computer program to realize that no vehicle enters the detection area covered by the geomagnetic sensor, the processor further realizes the following steps:
randomly selecting a plurality of target data, and calculating the variance of the plurality of target data to obtain a variance value; judging whether a plurality of randomly selected target data are not less than a detection threshold value and the variance value is not more than a preset variance threshold value; if the randomly selected target data are not smaller than the detection threshold and the variance value is not larger than the preset variance threshold, calculating the average value of the randomly selected target data to obtain a target average value, updating the detection baseline and the detection threshold according to the target average value, and executing the detection that no vehicle enters the detection area covered by the geomagnetic sensor; if the plurality of randomly selected target data are not satisfied and are not less than the detection threshold or the variance value is greater than the preset variance threshold, discarding the plurality of randomly selected target data, and executing the detection area covered by the geomagnetic sensor when no vehicle enters the geomagnetic sensor.
In an embodiment, when the processor executes the computer program to implement the step of determining whether the vehicle leaves the detection area covered by the geomagnetic sensor according to the leaving detection data, the processor specifically implements the following steps:
obtaining the quantity which is not less than the detection threshold value in the leaving detection data to obtain the quantity to be judged; judging whether the number to be judged is smaller than a preset threshold value or not; if the number to be judged is smaller than a preset threshold value, no vehicle leaves a detection area covered by the geomagnetic sensor; and if the number to be judged is not less than the preset threshold value, a vehicle leaves the detection area covered by the geomagnetic sensor.
The storage medium may be a usb disk, a removable hard disk, a Read-Only Memory (ROM), a magnetic disk, or an optical disk, which can store various computer readable storage media.
Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the examples described in connection with the embodiments disclosed herein may be embodied in electronic hardware, computer software, or combinations of both, and that the components and steps of the examples have been described in a functional general in the foregoing description for the purpose of illustrating clearly the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative. For example, the division of each unit is only one logic function division, and there may be another division manner in actual implementation. For example, various elements or components may be combined or may be integrated into another system, or some features may be omitted, or not implemented.
The steps in the method of the embodiment of the invention can be sequentially adjusted, combined and deleted according to actual needs. The units in the device of the embodiment of the invention can be merged, divided and deleted according to actual needs. In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a storage medium. Based on such understanding, the technical solution of the present invention essentially or partially contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a terminal, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The traffic flow detection method is characterized by comprising the following steps:
acquiring a detection baseline and a detection threshold;
initializing a traffic flow numerical value corresponding to a detection area covered by the geomagnetic sensor;
acquiring detection data from a geomagnetic sensor to obtain initial data;
preprocessing the initial data to obtain target data;
judging whether a vehicle passes through a detection area covered by the geomagnetic sensor according to the target data;
if vehicles pass through the detection area covered by the geomagnetic sensor, updating the corresponding traffic flow value;
counting the traffic flow numerical value to form a statistical result;
and feeding back the statistical result to the terminal for reference of flow scheduling.
2. The method of detecting a vehicle flow according to claim 1, wherein the obtaining a detection baseline and a detection threshold includes:
when no vehicle passes through a detection area covered by the geomagnetic sensor, acquiring data of the started geomagnetic sensor;
preprocessing data of the geomagnetic sensor to obtain test data;
averaging the test data to form a detection baseline;
subtracting a value from the detection baseline to obtain a detection threshold.
3. The method for detecting the traffic flow according to claim 1, wherein the preprocessing the initial data to obtain the target data includes:
and filtering the initial data to obtain target data.
4. The method for detecting a vehicle flow rate according to claim 1, wherein the determining whether a vehicle passes through a detection area covered by a geomagnetic sensor based on the target data includes:
judging whether a vehicle enters a detection area covered by the geomagnetic sensor or not according to the target data;
if a vehicle enters a detection area covered by the geomagnetic sensor, acquiring detection data from the geomagnetic sensor again, and filtering the detection data to obtain leaving detection data;
judging whether a vehicle leaves a detection area covered by the geomagnetic sensor or not according to the leaving detection data;
if the vehicle leaves the detection area covered by the geomagnetic sensor, the vehicle passes through the detection area covered by the geomagnetic sensor.
5. The traffic flow detection method according to claim 4, wherein the determining whether or not a vehicle enters a detection area covered by the geomagnetic sensor based on the target data includes:
judging whether the target data is not less than a detection threshold value;
if the target data is not smaller than the detection threshold, no vehicle enters a detection area covered by the geomagnetic sensor;
and if the target data are smaller than the detection threshold value, a vehicle enters a detection area covered by the geomagnetic sensor.
6. The vehicle flow rate detection method according to claim 5, wherein before the vehicle enters the detection area covered by the geomagnetic sensor, the method further comprises:
randomly selecting a plurality of target data, and calculating the variance of the plurality of target data to obtain a variance value;
judging whether a plurality of randomly selected target data are not less than a detection threshold value and the variance value is not more than a preset variance threshold value;
if the randomly selected target data are not smaller than the detection threshold and the variance value is not larger than the preset variance threshold, calculating the average value of the randomly selected target data to obtain a target average value, updating the detection baseline and the detection threshold according to the target average value, and executing the detection that no vehicle enters the detection area covered by the geomagnetic sensor;
if the plurality of randomly selected target data are not satisfied and are not less than the detection threshold or the variance value is greater than the preset variance threshold, discarding the plurality of randomly selected target data, and executing the detection area covered by the geomagnetic sensor when no vehicle enters the geomagnetic sensor.
7. The method for detecting a vehicle flow rate according to claim 1, wherein the determining whether or not the vehicle leaves the detection area covered by the geomagnetic sensor based on the leaving detection data includes:
obtaining the quantity which is not less than the detection threshold value in the leaving detection data to obtain the quantity to be judged;
judging whether the number to be judged is smaller than a preset threshold value or not;
if the number to be judged is smaller than a preset threshold value, no vehicle leaves a detection area covered by the geomagnetic sensor;
and if the number to be judged is not less than the preset threshold value, a vehicle leaves the detection area covered by the geomagnetic sensor.
8. A vehicle flow rate detection device is characterized by comprising:
a reference quantity acquisition unit for acquiring a detection baseline and a detection threshold;
the initialization unit is used for initializing a traffic flow numerical value corresponding to a detection area covered by the geomagnetic sensor;
a data acquisition unit for acquiring detection data from the geomagnetic sensor to obtain initial data;
the preprocessing unit is used for preprocessing the initial data to obtain target data;
the judging unit is used for judging whether a vehicle passes through a detection area covered by the geomagnetic sensor according to the target data;
the updating unit is used for updating the corresponding traffic flow value if vehicles pass through the detection area covered by the geomagnetic sensor;
the statistical unit is used for carrying out statistics on the traffic flow numerical value to form a statistical result;
and the feedback unit is used for feeding back the statistical result to the terminal for reference of flow scheduling.
9. A computer device, characterized in that the computer device comprises a memory, on which a computer program is stored, and a processor, which when executing the computer program implements the method according to any of claims 1 to 7.
10. A storage medium, characterized in that the storage medium stores a computer program which, when executed by a processor, implements the method according to any one of claims 1 to 7.
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