Vehicle type identification circuit and vehicle type identification equipment

Abstract

The embodiment of the utility model discloses a vehicle type identification circuit and vehicle type identification equipment, the circuit comprises a main control unit, a laser radar module, a vehicle head license plate identification camera U2, a vehicle body vehicle type identification camera U3 and a vehicle tail license plate identification camera U4, the laser radar module is connected with the vehicle head license plate identification camera U2 through a logic AND gate circuit; the main control unit is connected with the vehicle head license plate recognition camera U2, the vehicle body type recognition camera U3 and the vehicle tail license plate recognition camera U4. The laser radar module comprises a laser radar processing chip U1 and a radar transmitting and receiving unit U6, and the laser radar processing chip U1 is connected with the main control unit; the radar transmitting and receiving unit U6 is connected with the laser radar processing chip U1 and the logic AND gate circuit. By implementing the circuit provided by the embodiment of the utility model, vehicle type identification errors are not easy to occur, the labor cost is saved, the utilization rate of toll station equipment is improved, and the identification accuracy is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of high-speed traffic management equipment, in particular to a vehicle type recognition circuit and a vehicle type recognition device. Background Art

[0002] At present, there are self-service card issuing devices at the entrances of highway toll stations, MTC (Manual Toll Collection system) or mixed lanes of MTC and ETC (Electronic Toll Collection). In order to prevent large vehicles from collecting small car cards at the self-service card issuing devices, it is necessary to identify the model of the passing vehicle to determine what type of card should be issued to the vehicle. Similarly, at the exit of the MTC or ETC lane, it is necessary to identify the model of the passing vehicle and match it with the model identified in the pass medium such as the highway composite pass card or OBU (On board Unit). The lane system deducts fees based on the matching results to avoid toll evasion caused by "large vehicles with small labels".

[0003] Existing vehicle model recognition equipment can only use three-eye camera video recognition, among which the front license plate recognition camera U2 recognizes the front license plate number of the incoming vehicle, the body model recognition camera U3 calculates the vehicle model characteristics through video shooting AI algorithm, and the rear license plate recognition camera U4 recognizes the rear license plate number of the outgoing vehicle. The main control unit integrates the front license plate number, body model characteristics, and rear license plate number information, and outputs them to the lane control end as a characteristic parameter of a vehicle as a basis for vehicle passage. This type of architecture device has a defect, that is, if the front license plate recognition camera U2 does not correctly recognize the front license plate number of the current incoming vehicle, but mistakenly recognizes the license plate number of the rear vehicle, it will package and output an incorrect combination of the front license plate number of the rear vehicle, the current vehicle model, and the license plate number of the rear end of the current vehicle, resulting in an output result queue error, which in turn affects the lane software judgment and causes the vehicle to be unable to pass; this situation can only be achieved by combining vehicle model recognition with manual labor, but this method not only has high labor costs but also low efficiency.

[0004] Therefore, it is necessary to design a new device to reduce the possibility of vehicle model recognition errors, save labor costs, improve the utilization rate of toll station equipment, and improve recognition accuracy. Utility Model Content

[0005] The purpose of the utility model is to overcome the defects of the prior art and provide a vehicle type identification circuit and a vehicle type identification device.

[0006] To solve the above technical problems, the purpose of the utility model is achieved through the following technical solutions: providing a vehicle model recognition circuit, including a main control unit, a laser radar module, a front license plate recognition camera U2, a body vehicle model recognition camera U3 and a rear license plate recognition camera U4, the laser radar module is connected to the front license plate recognition camera U2 through a logic AND gate circuit; the main control unit is respectively connected to the front license plate recognition camera U2, the body vehicle model recognition camera U3 and the rear license plate recognition camera U4; the laser radar module includes a laser radar processing chip U1 and a radar transmitting and receiving unit U6, the laser radar processing chip U1 is connected to the main control unit; the radar transmitting and receiving unit U6 is respectively connected to the laser radar processing chip U1 and the logic AND gate circuit.

[0007] Its further technical solution is: the logic AND gate circuit includes a logic AND gate chip U5, and the model of the logic AND gate chip U5 is 74HC1G08.

[0008] Its further technical solution is: it also includes a microwave radar module, and the microwave radar module is connected to the main control unit.

[0009] In addition, in order to overcome the defects of the prior art, the utility model also provides a vehicle type identification device, including the above-mentioned vehicle type identification circuit.

[0010] A further technical solution is: it also includes an information display unit, and the information display unit is connected to the main control unit.

[0011] Its further technical solution is: it also includes a bracket, on which the front license plate recognition camera U2, the body model recognition camera U3 and the rear license plate recognition camera U4 are installed.

[0012] A further technical solution is as follows: the information display unit includes a plurality of LED lights, the LED lights are mounted on the bracket, and the LED lights are located directly below the vehicle body model recognition camera U3.

[0013] A further technical solution is: the radar transmitting and receiving unit U6 is installed on the bracket, and the radar transmitting and receiving unit U6 is located below the LED lamp.

[0014] A further technical solution is: the microwave radar module is on the bracket, and the microwave radar module is located below the radar transmitting and receiving unit U6.

[0015] Its further technical solution is: the vehicle body model recognition camera U3 is located on the front of the bracket, the front license plate recognition camera U2 is inclined at 45° to the longitudinal axis of the bracket; the rear license plate recognition camera U4 is inclined at 45° to the longitudinal axis of the bracket, and the front license plate recognition camera U2 and the rear license plate recognition camera U4 are symmetrically arranged along the longitudinal axis of the bracket; the laser radar module is 1 meter above the ground; the microwave radar module is 0.8 meters above the ground.

[0016] Compared with the prior art, the utility model has the following beneficial effects: by setting a main control unit, a laser radar module, a front license plate recognition camera U2, a body model recognition camera U3 and a rear license plate recognition camera U4, the utility model utilizes the logical AND gate relationship between the laser radar module and the front license plate recognition camera U2 to effectively control the operation or non-operation of the front license plate recognition camera U2, thereby making it less likely to make vehicle model recognition errors, saving labor costs, improving the utilization rate of toll station equipment, and improving recognition accuracy.

[0017] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A specific circuit schematic diagram of a vehicle type identification circuit provided by an embodiment of the utility model;

[0020] Figure 2 A schematic diagram of the structure of a vehicle type identification device provided by an embodiment of the utility model;

[0021] Figure 3 A schematic diagram of the side structure of a vehicle type identification device provided by an embodiment of the utility model;

[0022] Description of the symbols in the figure:

[0023] 10. Bracket; 20. Radar laser module; 30. Microwave laser radar; 40. Information display unit; DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0026] It should also be understood that the terms used in this utility model specification are only for the purpose of describing specific embodiments and are not intended to limit the utility model. As used in this utility model specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0027] It should be further understood that the term “and / or” used in the present specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0028] See also Figure 1 , Figure 1 The specific circuit schematic diagram of a vehicle type recognition circuit provided for the embodiment of the utility model can be used in the automatic card issuance and payment scenarios at the entrances and exits of highway toll stations. It is highly integrated, intelligent, unmanned, and multifunctional, which greatly promotes the construction of smart highway toll collection. When an abnormal situation occurs, the front license plate recognition camera U2 fails to recognize the current vehicle license plate, and the current vehicle has entered the acquisition range of the body model recognition camera U3 and the laser radar module. The front license plate recognition camera U2 will be prohibited from working to avoid collecting the license plate information of the rear vehicle, resulting in a mismatch between the license plate and the model information, solving the problem of incorrect matching of model parameters due to recognition errors. It greatly saves labor costs and improves the utilization rate of toll station equipment.

[0029] See also Figure 1 The above-mentioned vehicle type recognition circuit includes a main control unit, a laser radar module, a front vehicle license plate recognition camera U2, a body vehicle type recognition camera U3 and a rear vehicle license plate recognition camera U4. The laser radar module is connected to the front vehicle license plate recognition camera U2 through a logic AND gate circuit; the main control unit is respectively connected to the front vehicle license plate recognition camera U2, the body vehicle type recognition camera U3 and the rear vehicle license plate recognition camera U4.

[0030] In this embodiment, the model of the main control unit is but not limited to Amlogic C308X.

[0031] In this embodiment, the front license plate recognition camera U2 can capture and output the vehicle license plate information at a 45-degree angle; the rear license plate recognition camera U4 can capture and output the vehicle license plate information at a 45-degree angle; the body model recognition camera U3 can capture the body video stream image and obtain the body information and wheel axle information; the laser pulse emitted by the laser radar module is reflected after encountering an object, and the reflected laser is received. By measuring the time taken from the emission to the reception of the pulse and the known propagation speed of the laser, the distance between the current object and the laser radar module can be calculated; please refer to Figure 1 , the vehicle enters the recognition range of the front license plate recognition camera U2. At this time, the laser radar module U1 detects that there is no vehicle, and the OUTPUT1 signal outputs a high level. After passing through the logic AND gate chip U5 of the logic AND gate circuit, the Enable signal outputs a high level. The front license plate recognition camera U2 works normally in the enabled state and captures the front license plate; the vehicle enters the range of the body model recognition camera U3. At this time, the laser radar module detects that there is a vehicle, and the OUTPUT1 signal outputs a low level. After passing through the logic AND gate chip U5 of the logic AND gate circuit, the Enable signal outputs a low level. The front license plate recognition camera U2 does not work in the disabled state; the body model recognition camera U3 and the rear license plate recognition camera U4 are always enabled and in normal working state.

[0032] That is to say, the front license plate recognition camera U2 and the rear license plate recognition camera U4 can obtain the vehicle's license plate information by capturing videos at an angle of 45 degrees; the body model recognition camera U3 can capture the body video stream image and obtain the vehicle's body information and axle information; the laser radar module sends out a laser pulse, and when the laser encounters an object and reflects back, the laser radar module receives the reflected laser and measures the time taken from emission to reception and the known laser propagation speed, thereby calculating the distance between the object and the laser radar module; under the logical control of the system, when the vehicle enters the range of different cameras, when the laser radar module in front of the vehicle detects that there is no vehicle, the front license plate recognition camera U2 is enabled and starts to capture the front license plate; and when the vehicle enters the range of the body model recognition camera U3, the laser radar module detects that there is a vehicle, the front license plate recognition camera U2 will be disabled, but the body model recognition camera and the rear license plate recognition camera will remain enabled.

[0033] At this time, the output conditions corresponding to whether the vehicle enters the detection range of the laser radar module or does not enter are shown in Table 1.

[0034] Table 1. Vehicle entry truth table

[0035] Vehicle status OUTPUT1 Enable Working status of the vehicle license plate recognition camera U2 Enter the range of the vehicle body recognition camera U3 (lidar) L L prohibit Not in the range of the vehicle body recognition camera U3 (lidar) H H allow

[0036] The 45-degree oblique video capture of the front license plate recognition camera U2 and the rear license plate recognition camera U4 can effectively obtain the vehicle's license plate information and improve the accuracy and efficiency of vehicle identification.

[0037] The vehicle body model recognition camera U3 can obtain the vehicle body information and axle information by shooting the vehicle body video stream image for vehicle recognition and feature analysis.

[0038] The lidar module can measure the distance between an object and the module, providing data support for the vehicle's precise positioning and ranging, and helping to achieve more accurate vehicle detection and identification.

[0039] The system's logical control can automatically enable or disable the corresponding camera based on the detection results of the lidar module, avoiding unnecessary energy consumption and waste of resources.

[0040] In summary, this vehicle model recognition circuit uses multiple cameras and lidar modules to obtain vehicle-related information through different working principles, realizes functions such as license plate recognition, body recognition and distance measurement, and improves the accuracy and efficiency of vehicle recognition.

[0041] In one embodiment, see Figure 1 The above-mentioned logic AND gate circuit includes a logic AND gate chip U5, and the model of the logic AND gate chip U5 is but not limited to 74HC1G08.

[0042] In one embodiment, see Figure 1 The above-mentioned laser radar module includes a laser radar processing chip U1 and a radar transmitting and receiving unit U6. The laser radar processing chip U1 is connected to the main control unit; the radar transmitting and receiving unit U6 is respectively connected to the laser radar processing chip U1 and the logic gate circuit.

[0043] The above-mentioned laser radar processing chip U1 is a data processing unit. The radar transmitting and receiving unit U6 includes a transmitting unit and a receiving unit; the laser pulse emitted by the transmitting unit is reflected after encountering an object, and the reflected laser is received by the receiving unit. By measuring the time taken from the pulse to the reception, and the known propagation speed of the laser, the distance between the current vehicle and the laser radar module can be calculated.

[0044] In this embodiment, the model of the radar transmitting and receiving unit U6 is but not limited to LTV-217-CG.

[0045] In one embodiment, the above-mentioned vehicle type recognition circuit further includes a microwave radar module 30, which is connected to the main control unit. The microwave radar module 30 detects incoming vehicles through microwave radar.

[0046] The above-mentioned vehicle model recognition circuit, by setting a main control unit, a laser radar module, a front license plate recognition camera U2, a body vehicle model recognition camera U3 and a rear license plate recognition camera U4, uses the logic and gate relationship between the laser radar module and the front license plate recognition camera U2 to effectively control the operation or non-operation of the front license plate recognition camera U2, thereby making it less likely to make vehicle model recognition errors, saving labor costs, improving the utilization rate of toll station equipment, and improving recognition accuracy.

[0047] In one embodiment, see Figure 2 , and also provides a vehicle type identification device, including the above-mentioned vehicle type identification circuit.

[0048] In one embodiment, see Figure 2 , a vehicle type identification device also includes an information display unit 40, and the information display unit 40 is connected to the main control unit.

[0049] In one embodiment, see Figure 2 and Figure 3 A vehicle type recognition device also includes a bracket 10, on which a front vehicle license plate recognition camera U2, a body vehicle type recognition camera U3 and a rear vehicle license plate recognition camera U4 are installed.

[0050] In one embodiment, see Figure 2 The information display unit 40 includes a plurality of LED lights, which are mounted on a bracket 10 and are located directly below the vehicle body model recognition camera U3.

[0051] In one embodiment, see Figure 2 The radar transmitting and receiving unit U6 is installed on the bracket 10, and the radar transmitting and receiving unit U6 is located below the LED light. Different colors of the LED light indicate different states of the device.

[0052] In one embodiment, see Figure 2 The microwave radar module 30 is on the bracket 10, and the microwave radar module 30 is located below the radar transmitting and receiving unit U6.

[0053] Specifically, the vehicle body model recognition camera U3 is located on the front of the bracket 10, and the front license plate recognition camera U2 is set to be inclined at 45° with the longitudinal axis of the bracket 10; the rear license plate recognition camera U4 is inclined at 45° with the longitudinal axis of the bracket 10, and the front license plate recognition camera U2 and the rear license plate recognition camera U4 are symmetrically arranged along the longitudinal axis of the bracket 10; the front license plate recognition camera U2, the vehicle body model recognition camera U3, and the rear license plate recognition camera U4 are deployed at the top of the bracket 10, the front license plate recognition camera U2 shoots the direction of the oncoming vehicle from the right at 45 degrees, the rear license plate recognition camera U4 shoots the direction of the vehicle leaving from the left at 45 degrees, and the body model recognition camera U3 shoots directly in front of the lane; the three are 1.5 meters above the ground to ensure that the whole picture of the vehicle is captured;

[0054] The laser radar module is deployed at the middle end of the bracket 10, illuminating the front of the lane, 1 meter above the ground;

[0055] The microwave radar module 30 is deployed at the middle end of the bracket 10, irradiating directly in front of the lane, and is 0.8 meters above the ground;

[0056] The above three are rationally deployed in spatial locations and cooperate with each other to collect information and output data.

[0057] The main control unit of this embodiment can achieve the following contents: centralized dispatching and controlling of internal unit modules, video stream processing and license plate recognition output of the front license plate recognition camera U2, video stream processing and license plate recognition of the rear license plate recognition camera U4, video stream processing and axle recognition of the vehicle body model recognition camera U3, control of microwave radar module 30 and laser radar module, data fusion of camera and radar module, control and display of information display unit 40, etc.

[0058] In this embodiment, the vehicle model recognition device integrates the front license plate recognition camera U2, the body model recognition camera U3, the rear license plate recognition camera U4, the laser radar module, the microwave radar module 30 and the information display unit 40, and realizes all-round vehicle information collection and data output by rationally deploying their spatial positions. The main control unit can centrally dispatch and control each unit module to realize functions such as license plate recognition, wheel axle recognition, and distance measurement, and control the information display unit 40 for display.

[0059] The integration of multiple sensors and cameras enables all-round vehicle information collection and improves recognition accuracy.

[0060] Through reasonable deployment and height setting, it is ensured that each camera and module can effectively capture the overall picture and key information of the vehicle.

[0061] The centralized dispatching and control of the main control unit enables the entire system to operate efficiently and realize multi-functional processing and data fusion.

[0062] The existence of the information display unit 40 enables the acquired vehicle information to be displayed intuitively, making it convenient for operators to monitor and make decisions.

[0063] The above-mentioned vehicle type recognition device, by setting the vehicle type recognition circuit on the bracket 10, also sets the information display unit 40, and reasonably deploys the height and position of each camera and module, the bracket 10 can be deployed at the intersection where identification is required, so as to perform vehicle identification, and it can also achieve the goal of less prone to vehicle type identification errors, saving labor costs, improving the utilization rate of toll station equipment, and improving recognition accuracy. Moreover, the structure is simple and the cost is low.

[0064] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the utility model, and these modifications or replacements should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A vehicle type identification circuit, characterized in that: It includes a main control unit, a laser radar module, a front license plate recognition camera U2, a body vehicle type recognition camera U3 and a rear license plate recognition camera U4. The laser radar module is connected to the front license plate recognition camera U2 through a logic AND gate circuit; the main control unit is respectively connected to the front license plate recognition camera U2, the body vehicle type recognition camera U3 and the rear license plate recognition camera U4; the laser radar module includes a laser radar processing chip U1 and a radar transmitting and receiving unit U6, the laser radar processing chip U1 is connected to the main control unit; the radar transmitting and receiving unit U6 is respectively connected to the laser radar processing chip U1 and the logic AND gate circuit.

2. A vehicle type identification circuit according to claim 1, characterized in that: The logic AND gate circuit includes a logic AND gate chip U5, and the model of the logic AND gate chip U5 is 74HC1G08.

3. A vehicle type identification circuit according to claim 2, characterized in that: It also includes a microwave radar module, which is connected to the main control unit.

4. A vehicle type identification device, characterized in that: It includes a vehicle type identification circuit as described in claim 3.

5. A vehicle type identification device according to claim 4, characterized in that: It also includes an information display unit, which is connected to the main control unit.

6. A vehicle type identification device according to claim 5, characterized in that: It also includes a bracket, on which the front license plate recognition camera U2, the body model recognition camera U3 and the rear license plate recognition camera U4 are installed.

7. A vehicle type identification device according to claim 6, characterized in that: The information display unit includes a plurality of LED lights, which are mounted on the bracket and are located directly below the vehicle body model recognition camera U3.

8. A vehicle type identification device according to claim 7, characterized in that: The radar transmitting and receiving unit U6 is installed on the bracket, and the radar transmitting and receiving unit U6 is located below the LED lamp.

9. A vehicle type identification device according to claim 8, characterized in that: The microwave radar module is on the bracket, and the microwave radar module is located below the radar transmitting and receiving unit U6.

10. The vehicle type identification device according to claim 6, characterized in that: The vehicle body model recognition camera U3 is located on the front of the bracket, and the front license plate recognition camera U2 is inclined at 45° to the longitudinal axis of the bracket; the rear license plate recognition camera U4 is inclined at 45° to the longitudinal axis of the bracket, and the front license plate recognition camera U2 and the rear license plate recognition camera U4 are symmetrically arranged along the longitudinal axis of the bracket; the laser radar module is 1 meter above the ground; the microwave radar module is 0.8 meter above the ground.

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