A parking lot anti-tailgating traffic control system

Abstract

The present invention relates to a parking lot anti-tailgating traffic control system. The system determines whether the following vehicle has the intention to tailgate out based on the horizontal distance between the crossbeam and the following vehicle. When it is determined that the following vehicle has a tailgating intention and it is recognized that the following vehicle has not paid the fee, it is considered that there is a high probability that it will tailgate out and evade the fee. At this time, the system automatically adjusts the crossbeam to a height lower than the front windshield of the following vehicle, intercepts the following vehicle, and makes it as far away from the exiting vehicle as possible; when it is determined that the following vehicle has a tailgating intention and it is recognized that the following vehicle has paid the fee, in order to avoid the gate being unable to photograph the following vehicle due to the following vehicle being too close, resulting in the inability to query the exit record of the vehicle later, at this time, the system automatically adjusts the crossbeam to a height higher than the front hood of the following vehicle and lower than the upper edge of its front windshield, and imposes a certain degree of interception on the following vehicle, without making it too far away from the front vehicle to affect the traffic efficiency. The system can effectively solve the problem of vehicles tailgating out of the parking lot and evading the fee, and improve the management level of the parking lot.

Description

Technical Field

[0001] The invention relates to the technical field of traffic control, and in particular to a parking lot anti-tailgating traffic control system. Background Art

[0002] Existing garages such as underground garages in residential areas and garage entrances in shopping malls are equipped with gates. Gates are entrance and exit management equipment specially used to restrict the driving passage of motor vehicles on roads. They are now widely used in various shopping mall parking entrances and exits, residential parking entrances and exits, etc., to manage the entry and exit of vehicles.

[0003] The existing gate machine's car barrier is equipped with a signal sensor module and an anti-smashing car sensing module. The car barrier will only fall when no vehicle is found in the detection area after the vehicle has passed a certain distance, which will cause a time difference. If during use, after the current car passes through the access control gate, if the following car follows the front car and drives out closely, the car barrier will not be able to fall accurately, resulting in a situation where vehicles follow the parking lot to evade fees, affecting the traffic order of the parking lot and the efficiency of vehicle charging management, which needs to be improved. Summary of the invention

[0004] Based on the above description, the present invention provides a parking lot anti-tailgating traffic control system to solve the problem of tailgating and evading fees in existing parking lots.

[0005] The technical solution of the present invention to solve the above technical problems is as follows:

[0006] A parking lot anti-tailgating traffic control system comprises a gate arranged at the exit of the parking lot, a blocking device arranged behind the gate, and an image shooting device arranged behind the blocking device; the blocking device is a "gate"-shaped structure across the road, the blocking device comprises a pair of vertically spaced columns, the bottom of the columns is fixed to the ground through a base, a vertical first screw rod is arranged inside the column, the upper end of the first screw rod is rotatably connected to the upper end of the column, a first motor is arranged at the lower end of the first screw rod, the housing of the first motor is fixedly connected to the column, and the first The output shaft of the motor is coaxially connected to the lower end of the screw rod, a crossbeam is arranged between the two columns, a threaded hole is arranged at the end of the crossbeam, the first screw rod passes through the threaded hole and is adapted to the threaded hole; a camera module for the rear vehicle image is installed on the crossbeam; the blocking device also includes a distance measuring mechanism arranged above the crossbeam, the distance measuring mechanism extends to the rear of the crossbeam, a distance sensor is installed at the rear end of the distance measuring mechanism, the distance sensor faces the ground below, and is used to detect the vehicle below; the system also includes a controller for controlling the first motor, and the distance sensor is electrically connected to the controller;

[0007] When the gate captures a vehicle exiting the exit area, and the distance sensor senses a following vehicle, it is determined that the following vehicle has the intention to follow the vehicle out; at the same time, the camera module captures an image of the front of the following vehicle and transmits the image data to the controller, which identifies the license plate number of the vehicle in the image. After successful identification, the controller sends verification information to the parking metering system. After receiving the verification information, the parking metering system queries the exit payment record of the following vehicle. If it is found that the following vehicle has not paid, the parking metering system sends an "unpaid" signal to the controller; if the following vehicle has paid, the parking metering system sends a "paid" signal to the controller; at the same time, the image capture device captures an image of the following vehicle, and the controller obtains the actual heights of the three feature points of the following vehicle by image processing. The three feature points are a, b, and c, where point a is the frontmost point on the vehicle; point b is the turning point between the front hood and the front windshield of the vehicle; and point c is the front edge point of the vehicle roof.

[0008] When the main control module determines that the following vehicle has the intention to follow the vehicle out of the parking lot, and obtains the three characteristic points of the following vehicle, and the main control module receives the "paid" signal from the parking metering system, the main control module selects point b and point c as reference points, and calculates the interception height H=0.5×(Hb+ Hc), where Hb represents the height of point b and Hc represents the height of point c; When the main control module determines that the following vehicle has the intention to follow the vehicle out of the parking lot, and obtains the three characteristic points of the following vehicle, and the main control module receives the "unpaid" signal from the parking metering system, the main control module selects point a and point b as reference points, and calculates the interception height H=0.5×(Ha+ Hb), where Ha represents the height of point a and Hb represents the height of point b;

[0009] After the controller calculates the interception height, it controls the required rotation angle of the first motor of the control cabinet to adjust the crossbeam to the required interception height;

[0010] After the vehicle to be exited drives out and the gate barrier begins to fall back, the gate control system outputs a feedback signal to the controller, and the controller controls the crossbeam to return to its initial height after receiving the feedback signal.

[0011] As a preferred solution: the distance measuring mechanism includes a hollow supporting tube and a hollow telescopic rod, the telescopic rod is movably arranged in the supporting tube, the front end of the supporting tube is fixedly connected to the cross beam through a connecting column, and the front end of the telescopic rod extends into the supporting tube; the distance sensor is installed at the rear end of the telescopic rod; a second motor is installed at the front end of the supporting tube, and a second screw rod is arranged in the supporting tube, the second screw rod is arranged along the length direction of the supporting tube, a threaded sleeve is installed at the front end of the telescopic rod, the front end of the second screw rod is coaxially connected to the output shaft of the second motor, the rear end of the second screw rod passes through the threaded sleeve and is adapted to the threaded sleeve, and the rear end of the second screw rod extends into the telescopic rod. The second motor is connected to the controller and is controlled by the controller; when the camera module captures an image behind the crossbeam, the controller identifies the vehicle features in the image to identify and count the number of vehicles waiting in line behind the crossbeam to exit; the system pre-calibrates the number interval of vehicles waiting in line and the value of the tailgating judgment distance, and when the controller identifies the number of vehicles in the line, the controller determines which number interval the number falls into, and then retrieves the value of the tailgating judgment distance corresponding to the number interval, and calculates the stroke that the distance sensor needs to move, and then converts the required rotation angle of the second motor, and then the controller controls the second motor to rotate the required angle, thereby adjusting the tailgating judgment distance to the required value.

[0012] As a preferred solution: the process of processing the image to obtain the actual heights of the three feature points of the following vehicle is to first binarize the image to make the vehicle contour line clearly visible; then identify the three feature points a, b, and c of the vehicle upper surface contour line in the binary image; mark each feature point after identifying the three feature points; then coordinate the marked binary image, the lower left corner of the image is the origin of the coordinate system, and then read the vertical coordinate value of each marked feature point; finally, the actual height of the three feature points is converted according to the height of the actual coverage range of the image captured by the shooting device and the vertical coordinate value.

[0013] As a preferred solution: the controller includes a main control module, a first drive module, a second drive module, a storage module, a communication module and a power module; wherein the input end of the first drive module is connected to the control signal output end of the main control module, and the output end of the first drive module is connected to the control end of the first motor; the input end of the second drive module is connected to the control signal output end of the main control module, and the output end of the second drive module is connected to the control end of the second motor; the storage module is connected to the data read and write port of the main control module; the communication module is connected to the transceiver port of the main control module; the output end of the camera module is connected to the data port of the main control module; the distance sensor is connected to the signal sampling port of the main control module; the power module is connected to each module and device for power supply.

[0014] As a preferred solution: it also includes an audible and visual alarm, which is connected to the control signal output end of the main control module.

[0015] As a preferred solution: the power supply module is a UPS power supply.

[0016] As a preferred solution: the communication module is an RJ45 communication module, a WIFI module or an IoT card communication module.

[0017] Compared with the prior art, the technical solution of the present application has the following beneficial technical effects: the system determines whether the following vehicle has the intention to follow the vehicle out of the parking lot based on the horizontal distance between the crossbeam and the following vehicle. When it is determined that the following vehicle has a tailing intention and it is recognized that the following vehicle has not paid the fee, it is considered that there is a high probability that the following vehicle will follow the vehicle out of the parking lot to evade the fee. At this time, the system automatically adjusts the crossbeam to a height lower than the front windshield of the following vehicle, intercepts the following vehicle, and makes it as far away from the exiting vehicle as possible; when it is determined that the following vehicle has a tailing intention and it is recognized that the following vehicle has paid the fee, in order to avoid the gate being unable to photograph the following vehicle due to the close distance between the following vehicles and the inability to query the exit record of the vehicle later, the system automatically adjusts the crossbeam to a height higher than the front hood of the following vehicle and lower than the upper edge of its front windshield, and imposes a certain degree of interception on the following vehicle without making it too far away from the vehicle in front and affecting the traffic efficiency. The system can effectively solve the problem of vehicles following the vehicle out of the parking lot to evade the fee and improve the management level of the parking lot. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Schematic diagram of the arrangement of the control system in this embodiment;

[0019] Figure 2 is a schematic diagram of image processing in this embodiment;

[0020] Figure 3 is a schematic diagram of the structure of the blocking device in this embodiment;

[0021] Figure 4 Schematic diagram of the external structure of the distance measuring mechanism in this embodiment;

[0022] Figure 5 Schematic diagram of the internal structure of the distance measuring mechanism in this embodiment;

[0023] Figure 6 Schematic diagram of the control principle in this embodiment.

[0024] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0025] 1. Gate; 2. Blocking device; 201. Column; 202. Base; 203. First screw rod; 204. First motor; 205. Crossbeam; 206. Sound and light alarm; 207. Connecting column; 208. Camera module; 209. Support tube; 210. Telescopic rod; 211. Distance sensor; 212. Threaded hole; 213. Second motor; 214. Second screw rod; 215. Threaded sleeve; 3. Image capture device; 4. Exit vehicle; 5. Following vehicle. DETAILED DESCRIPTION

[0026] Reference Figure 1 A parking lot anti-tailgating traffic control system includes a gate 1 arranged at the exit of the parking lot, a blocking device 2 arranged behind the gate 1, and an image shooting device 3 arranged behind the blocking device 2.

[0027] Reference Figure 3 The blocking device 2 in this embodiment is a "gate"-shaped structure across the road. The blocking device 2 includes a pair of vertically spaced columns 201. The bottom of the column 201 is fixed to the ground through a base 202. An audible and visual alarm 206 is provided at the upper end of the column 201. A vertical first screw rod 203 is provided on the inner side of the column 201. The upper end of the first screw rod 203 is rotatably connected to the upper end of the column 201. A first motor 204 is provided at the lower end of the first screw rod 203. The housing of the first motor 204 is fixedly connected to the column 201, and the output shaft of the first motor 204 is coaxially connected to the lower end of the screw rod.

[0028] A crossbeam 205 is disposed between the two columns 201, and a threaded hole 212 (such as Figure 4 As shown in FIG. 2 ), the first screw rod 203 passes through the threaded hole 212 and is adapted to the threaded hole 212. When the output shaft of the first motor 204 rotates, the first screw rod 203 is driven to rotate synchronously, thereby driving the cross beam 205 to rise or fall. A camera module 208 is installed on the cross beam 205, and the camera module 208 is tilted downward, which is used to capture the image of the vehicle behind the cross beam 205.

[0029] Reference Figure 4 and Figure 5 The blocking device 2 in this embodiment also includes a distance measuring mechanism arranged above the crossbeam 205. The distance measuring mechanism extends to the rear of the crossbeam 205, and a distance sensor 211 is installed at the rear end of the distance measuring mechanism.

[0030] In this embodiment, the distance measuring mechanism includes a hollow support tube 209 and a hollow telescopic rod 210. The telescopic rod 210 is movably arranged in the support tube 209. The front end of the support tube 209 is fixedly connected to the cross beam 205 through a connecting column 207. The front end of the telescopic rod 210 extends into the support tube 209. A distance sensor 211 is installed at the bottom of the rear end of the telescopic rod 210. The distance sensor 211 faces the ground below and is used to detect the vehicle below. When there is no vehicle passing below the distance measuring mechanism, the distance detection value output by the distance sensor 211 is actually the distance between the sensor and the ground; when there is a vehicle passing below the distance measuring mechanism, the distance detection value output by the distance sensor 211 will change dynamically.

[0031] A second motor 213 is installed at the front end of the support tube 209, and a second screw rod 214 is arranged in the support tube 209. The second screw rod 214 is arranged along the length direction of the support tube 209. A threaded sleeve 215 is installed at the front end of the telescopic rod 210. The front end of the second screw rod 214 is coaxially connected to the output shaft of the second motor 213, and the rear end of the second screw rod 214 passes through the threaded sleeve 215 and is adapted to the threaded sleeve 215. The rear end of the second screw rod 214 extends into the telescopic rod 210.

[0032] When the second motor 213 rotates, it will drive the second screw rod 214 to rotate synchronously, thereby driving the telescopic rod 210 to extend or retract.

[0033] The control system in this embodiment further includes a controller for controlling the first motor 204 and the second motor 213 .

[0034] Reference Figure 6 The controller includes a main control module, a first drive module, a second drive module, a storage module, a communication module and a power module. The first drive module and the second drive module are used to drive the first motor 204 and the second motor 213 respectively. In this embodiment, the first motor 204 and the second motor 213 are both stepping motors, and the first drive module and the second drive module are pulse signal output modules.

[0035] The input end of the first driving module is connected to the control signal output end of the main control module, and the output end of the first driving module is connected to the control end of the first motor 204; the input end of the second driving module is connected to the control signal output end of the main control module, and the output end of the second driving module is connected to the control end of the second motor 213; the storage module is connected to the data read-write port of the main control module; the communication module is connected to the transceiver port of the main control module; the output end of the camera module 208 is connected to the data port of the main control module; the distance sensor 211 is connected to the signal sampling port of the main control module; the sound and light alarm 206 is connected to the control signal output end of the main control module; the power module is connected to each module and device for power supply. The power module in this embodiment is a UPS power supply.

[0036] The communication module in this embodiment is an RJ45 communication module, a WIFI module or an IoT card communication module.

[0037] The controller is connected to the parking metering system and the gate 1 control system in communication.

[0038] The working principle of this traffic control system is:

[0039] Reference Figure 1 , define the area between the gate 1 and the blocking device 2 as the exit area, and the vehicles located in the exit area are exit vehicles 4; define the area behind the blocking device 2 as the detection area, and the vehicles located in the detection area are following vehicles 5.

[0040] When the vehicle enters the detection area and begins to pass under the distance sensor 211, the distance detection value output by the distance sensor 211 begins to change dynamically. When the main control module collects the distance detection value output by the distance sensor 211 and begins to change dynamically (that is, the distance sensor 211 senses the following vehicle 5), the vehicle in the detection area just enters the field of view directly in front of the shooting device. At this time, the main control module controls the image shooting device 3 to capture the side image of the vehicle, and the shooting device transmits the captured image data to the main control module, and the storage module is used to store the image data. The main control module has a built-in image processing unit, which first performs binarization processing on the image, and the vehicle contour line can be clearly displayed after the binarization processing; then the image processing unit identifies the three feature points of the upper surface contour line of the vehicle in the binary image.

[0041] like Figure 2 As shown, the three feature points are a, b, and c.

[0042] Point a is the frontmost point on the vehicle; point b is the turning point between the front hood and the front windshield of the vehicle; and point c is the front edge point of the vehicle roof.

[0043] After the image processing unit identifies the three feature points, it marks each feature point; then the image processing unit coordinates the marked binary image, with the lower left corner of the image being the origin of the coordinate system, and then reads the vertical coordinate value of each marked feature point; finally, the actual height of the three feature points is converted according to the height of the actual coverage range of the image taken by the shooting device and the vertical coordinate value.

[0044] When the system is in the initial state, the cross beam 205 of the blocking device 2 is at a default height, and when the cross beam 205 is at the default height, a sedan, SVU and a van are allowed to pass. In the initial state, the distance measuring mechanism is at its default extension length.

[0045] When the gate 1 captures a vehicle 4 exiting the exit area, and the distance sensor 211 senses a following vehicle 5, it is determined that the following vehicle 5 intends to follow the vehicle out of the exit area;

[0046] At the same time, the camera module 208 can capture the image of the front of the following vehicle 5 and transmit the image data to the main control module. The image processing unit recognizes the license plate number of the vehicle in the image. After successful recognition, the main control module sends verification information to the parking metering system through the communication module. After receiving the verification information, the parking metering system queries the exit payment record of the following vehicle 5. If it is found that the following vehicle 5 has not paid, the parking metering system sends a "non-payment" signal to the main control module. If the following vehicle 5 has paid, the parking metering system sends a "paid" signal to the main control module.

[0047] At the same time, the image capturing device 3 captures an image of the following vehicle 5 , and the image processing unit obtains the actual heights of the three feature points of the following vehicle 5 by processing the image.

[0048] When the main control module determines that the following vehicle 5 has the intention to follow the exit, and obtains the three characteristic points of the following vehicle 5, and the main control module receives the "paid" signal from the parking metering system, the main control module selects point b and point c as reference points and calculates the interception height H=0.5×(Hb+Hc), where Hb represents the height of point b and Hc represents the height of point c.

[0049] When the main control module determines that the following vehicle 5 intends to follow the exit, and obtains the three characteristic points of the following vehicle 5, and the main control module receives the "unpaid" signal from the parking metering system, the main control module selects point a and point b as reference points and calculates the interception height H=0.5×(Ha+ Hb), where Ha represents the height of point a and Hb represents the height of point b. The interception height is the height to which the crossbeam 205 needs to be adjusted.

[0050] After the main control module calculates the interception height, it calculates the descending stroke of the beam 205 according to the default height of the beam 205, and then converts the required rotation angle of the first motor 204 according to the pitch of the first screw rod 203, and then converts the number of pulses required to control the first motor 204; the main control module then sends a control instruction to the first drive module, so that the first drive module outputs a corresponding number of pulse signals to the first motor 204, so that the beam 205 can be adjusted to the required interception height. At the same time, the main control module controls the sound and light alarm 206 to send an alarm signal to remind the following vehicle 5 to keep a safe distance.

[0051] After the exiting vehicle 4 drives out and the barrier rod of the gate 1 starts to fall back, the control system of the gate 1 outputs a feedback signal to the main control module. After receiving the feedback signal, the main control module controls the cross beam 205 to rise and reset, so that the cross beam 205 returns to the initial height.

[0052] The system is based on the horizontal distance between the beam 205 and the following vehicle 5 (i.e., the following judgment distance L, refer to Figure 5 , L is the horizontal distance between the center of the connecting column 207 and the center of the distance sensor 211) to determine whether the following vehicle 5 has the intention to follow the exit. When it is determined that the following vehicle 5 has a tail-carrying intention and is recognized that the following vehicle 5 has not paid the fee, it is considered that there is a high probability that it will follow the exit to evade the fee. At this time, the system automatically adjusts the crossbeam 205 to a height lower than the front windshield of the following vehicle 5, intercepts the following vehicle 5, and makes it as far away from the exiting vehicle as possible; when it is determined that the following vehicle 5 has a tail-carrying intention and is recognized that the following vehicle 5 has paid the fee, in order to avoid the gate machine 1 being unable to photograph the following vehicle 5 due to the close following distance, resulting in the inability to query the exit record of the vehicle later, at this time, the system automatically adjusts the crossbeam 205 to a height higher than the front hood of the following vehicle 5 and lower than the upper edge of its front windshield, imposes a certain degree of interception on the following vehicle 5, and does not make it too far away from the leading vehicle to affect the traffic efficiency.

[0053] The above solution can effectively solve the problem of vehicles leaving the parking lot and following the owner to avoid paying fees, and improve the management level of the parking lot.

[0054] In this embodiment, after the camera module 208 captures the image behind the crossbeam 205 , the image processing module identifies the vehicle features in the image to identify and count the number of vehicles waiting in line behind the crossbeam 205 to exit.

[0055] The system can pre-calibrate the number interval of vehicles waiting in line and the value of the tailing judgment distance. For example, when the number of vehicles in the line is 0-10, the value of the tailing judgment distance L is L1; when the number of vehicles in the line is 10-20, the value of the tailing judgment distance L is L2, and so on. Among them, L2 is less than L1, that is, the more vehicles in the line, the smaller the value of L; in this way, the exit efficiency of vehicles can be prioritized when there are many vehicles in the line.

[0056] When the image processing module recognizes the number of vehicles in the queue, the main control module determines which number range the number falls into, and then retrieves the L value corresponding to the number range, and calculates the stroke that the distance sensor 211 needs to move, and then calculates the required rotation angle of the second motor 213 according to the pitch of the second screw rod 214. The main control module controls the second drive module to output a corresponding number of pulses to the second motor 213, thereby adjusting the trailing judgment distance to the required value.

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A parking lot anti-tailgating traffic control system, comprising a gate arranged at the exit of the parking lot, characterized in that: It also includes a blocking device arranged behind the gate and an image shooting device arranged behind the blocking device; the blocking device is a "gate"-shaped structure across the road, and the blocking device includes a pair of vertically spaced columns, the bottom of the columns is fixed to the ground through a base, a vertical first screw rod is arranged inside the columns, the upper end of the first screw rod is rotatably connected to the upper end of the column, a first motor is arranged at the lower end of the first screw rod, the housing of the first motor is fixedly connected to the column, the output shaft of the first motor is coaxially connected to the lower end of the screw rod, a crossbeam is arranged between the two columns, a threaded hole is arranged at the end of the crossbeam, the first screw rod passes through the threaded hole and fits with the threaded hole; a camera module for rear vehicle images is installed on the crossbeam; the blocking device also includes a distance measuring mechanism arranged above the crossbeam, the distance measuring mechanism extends to the rear of the crossbeam, and a distance sensor is installed at the rear end of the distance measuring mechanism, the distance sensor faces the ground below, and is used to detect the vehicle below; the system also includes a controller for controlling the first motor, and the distance sensor is electrically connected to the controller; When the gate captures a vehicle exiting the exit area, and the distance sensor senses a following vehicle, it determines that the following vehicle intends to follow the vehicle out of the exit area; At the same time, the camera module captures the image of the front of the following vehicle and transmits the image data to the controller. The controller identifies the license plate number of the vehicle in the image. After successful identification, the controller sends verification information to the parking metering system. After receiving the verification information, the parking metering system queries the exit payment record of the following vehicle. If it is found that the following vehicle has not paid, the parking metering system sends an "unpaid" signal to the controller. If the following vehicle has paid, the parking metering system sends a "paid" signal to the controller; at the same time, the image capture device captures the image of the following vehicle, and the controller obtains the actual heights of the three feature points of the following vehicle by image processing. The three feature points are a, b, and c, where point a is the most forward point on the vehicle; point b is the turning point between the front hood and the front windshield of the vehicle; and point c is the front edge point of the vehicle roof; When the main control module determines that the following vehicle has the intention to follow the vehicle out of the parking lot, and obtains the three characteristic points of the following vehicle, and the main control module receives the "paid" signal from the parking metering system, the main control module selects point b and point c as reference points, and calculates the interception height H=0.5×(Hb+ Hc), where Hb represents the height of point b and Hc represents the height of point c; when the main control module determines that the following vehicle has the intention to follow the vehicle out of the parking lot, and obtains the three characteristic points of the following vehicle, and the main control module receives the "unpaid" signal from the parking metering system, the main control module selects point a and point b as reference points, and calculates the interception height H=0.5×(Ha+ Hb), where Ha represents the height of point a and Hb represents the height of point b; After the controller calculates the interception height, it controls the required rotation angle of the first motor of the control cabinet to adjust the crossbeam to the required interception height; After the vehicle to be exited drives out and the gate barrier begins to fall back, the gate control system outputs a feedback signal to the controller, and the controller controls the crossbeam to return to its initial height after receiving the feedback signal.

2. The parking lot anti-tailgating traffic control system according to claim 1 is characterized by: The distance measuring mechanism includes a hollow supporting tube and a hollow telescopic rod, the telescopic rod is movably arranged in the supporting tube, the front end of the supporting tube is fixedly connected to the cross beam through a connecting column, and the front end of the telescopic rod extends into the supporting tube; the distance sensor is installed at the rear end of the telescopic rod; a second motor is installed at the front end of the supporting tube, and a second screw rod is arranged in the supporting tube, the second screw rod is arranged along the length direction of the supporting tube, a threaded sleeve is installed at the front end of the telescopic rod, the front end of the second screw rod is coaxially connected to the output shaft of the second motor, the rear end of the second screw rod passes through the threaded sleeve and is adapted to the threaded sleeve, the rear end of the second screw rod extends into the telescopic rod, and the second motor The machine is connected to the controller and is controlled by the controller; when the camera module captures the image behind the beam, the controller identifies the vehicle features in the image to identify and count the number of vehicles waiting in line behind the beam to exit; the system pre-calibrates the number interval of vehicles waiting in line and the value of the tailgating judgment distance. When the controller identifies the number of vehicles in the line, the controller determines which number interval the number falls into, and then retrieves the value of the tailgating judgment distance corresponding to the number interval, and converts the stroke that the distance sensor needs to move, and then converts the required rotation angle of the second motor, and then the controller controls the second motor to rotate the required angle, thereby adjusting the tailgating judgment distance to the required value.

3. The parking lot anti-tailgating traffic control system according to claim 1 is characterized by: The process of processing the image to obtain the actual height of the three characteristic points of the following vehicle is to first binarize the image, and then make the vehicle contour line clearly visible; Then, the three feature points a, b, and c of the upper surface contour line of the vehicle in the binary image are identified; After identifying the three feature points, each feature point is marked; then the marked binary image is coordinate-processed, and the lower left corner of the image is the origin of the coordinate system, and then the vertical coordinate value of each marked feature point is read; finally, the actual height of the three feature points is converted according to the height of the actual coverage range of the image taken by the shooting device and the vertical coordinate value.

4. The parking lot anti-tailgating traffic control system according to claim 2 is characterized by: The controller includes a main control module, a first drive module, a second drive module, a storage module, a communication module and a power module; wherein the input end of the first drive module is connected to the control signal output end of the main control module, and the output end of the first drive module is connected to the control end of the first motor; the input end of the second drive module is connected to the control signal output end of the main control module, and the output end of the second drive module is connected to the control end of the second motor; the storage module is connected to the data read-write port of the main control module; the communication module is connected to the transceiver port of the main control module; the output end of the camera module is connected to the data port of the main control module; the distance sensor is connected to the signal sampling port of the main control module; the power module is connected to each module and device for power supply.

5. The parking lot anti-tailgating traffic control system according to claim 4 is characterized by: It also includes an audible and visual alarm, which is connected to the control signal output end of the main control module.

6. The parking lot anti-tailgating traffic control system according to claim 4 is characterized by: The power supply module is a UPS power supply.

7. The parking lot anti-tailgating traffic control system according to claim 4 is characterized by: The communication module is an RJ45 communication module, a WIFI module or an IoT card communication module.

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