CN108648468A - Utilize the method for temperature computation vehicle flowrate - Google Patents
Utilize the method for temperature computation vehicle flowrate Download PDFInfo
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- CN108648468A CN108648468A CN201810397326.0A CN201810397326A CN108648468A CN 108648468 A CN108648468 A CN 108648468A CN 201810397326 A CN201810397326 A CN 201810397326A CN 108648468 A CN108648468 A CN 108648468A
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 238000012544 monitoring process Methods 0.000 claims abstract description 30
- 238000001514 detection method Methods 0.000 claims abstract description 22
- 238000000205 computational method Methods 0.000 abstract 1
- 230000000750 progressive effect Effects 0.000 abstract 1
- 238000004364 calculation method Methods 0.000 description 3
- 230000006698 induction Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000013500 data storage Methods 0.000 description 1
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/065—Traffic control systems for road vehicles by counting the vehicles in a section of the road or in a parking area, i.e. comparing incoming count with outgoing count
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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
- G08G1/0108—Measuring and analyzing of parameters relative to traffic conditions based on the source of data
- G08G1/0116—Measuring and analyzing of parameters relative to traffic conditions based on the source of data from roadside infrastructure, e.g. beacons
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- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Image Processing (AREA)
- Traffic Control Systems (AREA)
Abstract
The present invention relates to vehicle flowrate computational methods fields, especially disclose a kind of method using temperature computation vehicle flowrate, and step is following：（a）The average value process that thermal infrared imager constantly obtains 1,000 frame maximum temperature points in Road Detection region is：；Road monitors the range of A in region：i∈[i0,imax],j∈[j0,jmax] boxed area；In kth frame, the monitoring region A highest temperatures are：；：Monitor the progressive average that the highest temperature in the A of region is monitored in 1000 frames；k：Frame number is present frame when being equal to 1001, and 1~1000 indicates historical frames；i：Line number, from i0Row arrives imaxRow；j：Columns, from j0Arrange jmaxRow；As k=1001, present frame highest temperature statistical value is：；（b）Judge that the Rule of judgment for having vehicle to enter monitoring region A is：；Indicate the present frame highest temperature,Meet condition：Duration；：Indicate pre-set temperature threshold；：Indicate ambient temperature compensation value；
Description
Technical Field
The invention relates to the field of traffic flow calculation methods, in particular to a method for calculating traffic flow by using temperature.
Background
At present, the calculation modes of the traffic flow are roughly divided into two types: one type of vehicle detector utilizes a loop coil, which is based on the principle that a set of (2) induction coils are embedded at the base end of a road, and each set of induction coils is connected with a multi-channel vehicle detector. The method has accurate detection, but needs to be buried under the ground, is troublesome to install and maintain, can damage the road surface, and has high installation and maintenance cost. And in the other method, a road picture is acquired through a camera, and then the vehicle is identified through computer software, so that the identification speed is low and the accuracy is low.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides the method for calculating the traffic flow by using the temperature, which has high accuracy and simple identification method and cannot damage the road surface.
In order to achieve the purpose, the invention adopts the following technical scheme: a method for calculating a traffic flow using a temperature, comprising the steps of:
(a) the thermal infrared imager is arranged above a road, and continuously acquires the average value of the maximum temperature point of one thousand frames in the road detection area and transmits the average value to the judgment device; the process that the thermal infrared imager continuously acquires the average value of one thousand frames of highest temperature points in the road detection area comprises the following steps:
wherein, the scope of A in the road monitoring area: i is an element of [ i ∈ ]0,imax], j∈[j0,jmax]A square area of (1); in the k frame, the maximum temperature of the monitoring area a is:；
wherein,: monitoring the accumulated average value of the highest temperature in the monitoring area A in 1000 frames;
k: the frame number is equal to 1001, the frame is a current frame, and 1-1000 represents a historical frame;
i: number of lines, from i0Go to imaxA row;
j: number of columns, from j0Column to jmaxColumns;
when k =1001, the current frame maximum temperature statistic is:
；
(b) when the thermal infrared imager detects that the temperature in the road detection area changes, judging whether vehicles pass through the monitoring area or not by the judging device; the judgment condition that the judgment device judges that the vehicle enters the monitoring area A is as follows:
；
wherein,the maximum temperature of the current frame is shown,the conditions are satisfied:the duration of (d);
: indicating a preset temperature threshold;
: representing an ambient temperature compensation value;
: indicating a duration threshold for which the decision condition is met.
According to the invention, the temperature in the road detection area is monitored by the thermal infrared imager, and then whether a vehicle passes through is judged according to the change of the temperature; the method is simple, and the average value of the maximum temperature point of one thousand frames in the road detection area is obtained for calculation and comparison, so that the accuracy of temperature detection is ensured, omission is avoided, and misjudgment is avoided; the external temperature change, the temperature change caused by the passing of the vehicle, the time required by the passing of the vehicle and other information are fully considered, the consideration factors are sufficient, and the judgment accuracy is high; the use cost is low, the road surface can not be damaged, and the disassembly, the assembly and the maintenance are very convenient.
Further, the method also comprises the step (c) that when the judging device judges that the vehicle passes through, the judging device sends a signal to the counting module, and the counting module accumulates the number of the passing vehicles.
Further, the step (a) includes
(a1) The thermal infrared imager is arranged above a road, and continuously acquires the average value of the maximum temperature point of one thousand frames in the road detection area and transmits the average value to the judgment device; the process that the thermal infrared imager continuously acquires the average value of one thousand frames of highest temperature points in the road detection area comprises the following steps:
wherein, the scope of A in the road monitoring area: i is an element of [ i ∈ ]0,imax], j∈[j0,jmax]A square area of (1); in the k frame, the maximum temperature of the monitoring area a is:；
wherein,: monitor the area A within the 1000 framesHigh temperature cumulative mean;
k: the frame number is equal to 1001, the frame is a current frame, and 1-1000 represents a historical frame;
i: number of lines, from i0Go to imaxA row;
j: number of columns, from j0Column to jmaxColumns;
when k =1001, the current frame maximum temperature statistic is:
；
(a2) the camera is installed in the road top, and the camera constantly acquires the road image and transmits for recognition device, and recognition device passes through the vehicle model of road image discernment through the road to transmit and record the module and carry out the record.
The vehicle type can be identified by the camera and the identification device in the step (a 2), so that the use is convenient.
In conclusion, the invention can judge whether a vehicle passes through or not through the temperature change, has high judgment accuracy, simple structure and convenient disassembly and assembly, and is easy to realize.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the technical solutions in the embodiments of the present invention will be clearly and completely described below.
Example 1
A method for calculating a traffic flow using a temperature, comprising the steps of:
(a) the thermal infrared imager is arranged above a road and can be arranged on a portal frame. An area is set on a road as a road detection area, and the method is used for judging whether vehicles pass through the road detection area. And the thermal infrared imager continuously acquires the average value of the maximum temperature points of one thousand frames in the road detection area and then transmits the average value to the judgment device. The judging device is a computer, a mobile phone and other equipment provided with temperature calculating and judging software, or a chip of a single chip microcomputer and a central processing unit.
The process that the thermal infrared imager continuously acquires the average value of one thousand frames of highest temperature points in the road detection area comprises the following steps:
wherein, the scope of A in the road monitoring area: i is an element of [ i ∈ ]0,imax], j∈[j0,jmax]A square area of (1); in the k frame, the maximum temperature of the monitoring area a is:；
wherein,: monitoring the accumulated average value of the highest temperature in the monitoring area A in 1000 frames;
k: the frame number is equal to 1001, the frame is a current frame, and 1-1000 represents a historical frame;
i: number of lines, from i0Go to imaxA row;
j: number of columns, from j0Column to jmaxColumns;
when k =1001, the current frame maximum temperature statistic is:
。
(b) when the thermal infrared imager detects that the temperature in the road detection area changes, judging whether vehicles pass through the monitoring area or not by the judging device; the judgment condition that the judgment device judges that the vehicle enters the monitoring area A is as follows:
；
wherein,the maximum temperature of the current frame is shown,the conditions are satisfied:the duration of (d);
: indicating a preset temperature threshold;
: representing an ambient temperature compensation value;
: indicating a duration threshold for which the decision condition is met.
If the condition is not met, no vehicle passes through the device.
Example 2
In this embodiment, a counting module is added on the basis of embodiment 1, and the counting module may be counting software or a counting chip and is integrated with the determining device. Of course, the connection determination means may be a counter software.
In addition, the embodiment further comprises a step (c), when the judging device judges that the vehicle passes through, the judging device sends a signal to the counting module, and the counting module accumulates the number of the passing vehicles.
Example 3
The present embodiment improves the step (a) in embodiment 1, and adds the functions of vehicle type identification and data storage, specifically as follows:
the step (a) comprises steps (a 1) and (a 2):
(a1) the thermal infrared imager is arranged above a road, and continuously acquires the average value of the maximum temperature point of one thousand frames in the road detection area and transmits the average value to the judgment device; the process that the thermal infrared imager continuously acquires the average value of one thousand frames of highest temperature points in the road detection area comprises the following steps:
wherein, the scope of A in the road monitoring area: i is an element of [ i ∈ ]0,imax], j∈[j0,jmax]A square area of (1); in the k frame, the maximum temperature of the monitoring area a is:；
wherein,: monitoring the accumulated average value of the highest temperature in the monitoring area A in 1000 frames;
k: the frame number is equal to 1001, the frame is a current frame, and 1-1000 represents a historical frame;
i: number of lines, from i0Go to imaxA row;
j: number of columns, from j0Column to jmaxColumns;
when k =1001, the current frame maximum temperature statistic is:
。
(a2) the camera is installed in the road top, and this camera also can install on the portal frame. The camera constantly acquires road images and transmits the road images to the recognition device, image recognition software is installed on the recognition device, and the recognition device recognizes vehicle types passing through roads through the road images and transmits the vehicle types to the recording module for recording.
It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. 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.
Claims (3)
1. A method for calculating a traffic flow using a temperature, comprising the steps of:
(a) the thermal infrared imager is arranged above a road, and continuously acquires the average value of the maximum temperature point of one thousand frames in the road detection area and transmits the average value to the judgment device; the process that the thermal infrared imager continuously acquires the average value of one thousand frames of highest temperature points in the road detection area comprises the following steps:
wherein, the scope of A in the road monitoring area: i is an element of [ i ∈ ]0,imax], j∈[j0,jmax]A square area of (1); in the k frame, the maximum temperature of the monitoring area a is:；
wherein,: monitoring the accumulated average value of the highest temperature in the monitoring area A in 1000 frames;
k: the frame number is equal to 1001, the frame is a current frame, and 1-1000 represents a historical frame;
i: number of lines, from i0Go to imaxA row;
j: number of columns, from j0Column to jmaxColumns;
when k =1001, the current frame maximum temperature statistic is:
；
(b) when the thermal infrared imager detects that the temperature in the road detection area changes, judging whether vehicles pass through the monitoring area or not by the judging device; the judgment condition that the judgment device judges that the vehicle enters the monitoring area A is as follows:
；
wherein,the maximum temperature of the current frame is shown,the conditions are satisfied:the duration of (d);
: indicating a preset temperature threshold;
: representing an ambient temperature compensation value;
: indicating a duration threshold for which the decision condition is met.
2. The method for calculating a traffic flow using temperature according to claim 1, wherein: and (c) when the judging device judges that the vehicle passes through, the judging device sends a signal to the counting module, and the counting module accumulates the number of the passing vehicles.
3. The method for calculating a vehicle flow rate using temperature according to claim 1 or 2, wherein: said step (a) comprises
(a1) The thermal infrared imager is arranged above a road, and continuously acquires the average value of the maximum temperature point of one thousand frames in the road detection area and transmits the average value to the judgment device; the process that the thermal infrared imager continuously acquires the average value of one thousand frames of highest temperature points in the road detection area comprises the following steps:
wherein, the scope of A in the road monitoring area: i is an element of [ i ∈ ]0,imax], j∈[j0,jmax]A square area of (1); in the k frame, the maximum temperature of the monitoring area a is:；
wherein,: monitoring the accumulated average value of the highest temperature in the monitoring area A in 1000 frames;
k: the frame number is equal to 1001, the frame is a current frame, and 1-1000 represents a historical frame;
i: number of lines, from i0Go to imaxA row;
j: number of columns, from j0Column to jmaxColumns;
when k =1001, the current frame maximum temperature statistic is:
；
(a2) the camera is installed in the road top, and the camera constantly acquires the road image and transmits for recognition device, and recognition device passes through the vehicle model of road image discernment through the road to transmit and record the module and carry out the record.
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| CN201810397326.0A CN108648468A (en) | 2018-04-28 | 2018-04-28 | Utilize the method for temperature computation vehicle flowrate |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110288833A (en) * | 2019-07-15 | 2019-09-27 | 北京航空航天大学 | A kind of vehicle flow detection system based on high-precision infrared sensor array |
| CN110533909A (en) * | 2019-09-10 | 2019-12-03 | 重庆大学 | A kind of driving behavior analysis method and system based on traffic environment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110288833A (en) * | 2019-07-15 | 2019-09-27 | 北京航空航天大学 | A kind of vehicle flow detection system based on high-precision infrared sensor array |
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Application publication date: 20181012 |