TWI825306B - License plate capturing system and license plate capturing method - Google Patents

Abstract

A license plate capturing system including a plurality of camera lens, a plurality of sensors and a processor. The sensors are configured to sense a target vehicle entering a target region based on a target direction. The processor is configured to control a target camera lens among the camera lens corresponding to the target direction to capture a target image including a license plate image according to a sensing result of the sensors.

Description

License plate shooting system and license plate shooting method

The present invention relates to an electronic control technology, and in particular to a license plate photographing system and a license plate photographing method.

Some existing parking lots have gradually used image recognition mechanisms to detect the license plate numbers of vehicles entering the parking lot. For example, cameras can be installed at the gates entering the parking lot to detect the license plate numbers of vehicles entering or leaving the parking lot. However, parking spaces on the roadside do not have gates, and different drivers may have different habits such as the angle of entry for parking on the roadside. In addition, outdoor weather conditions (such as rainy or cloudy days) will also affect the accuracy of outdoor image recognition. Therefore, automated roadside parking management and/or charging systems are more difficult to design than large parking lots.

The present invention provides a license plate photographing system and a license plate photographing method, which can accurately use a photography lens in an appropriate direction to capture a license plate image of a vehicle, thereby improving the above problems.

Embodiments of the present invention provide a license plate photographing system, which includes a plurality of photographic lenses, a plurality of sensors and at least one processor. The sensor is used to sense a target vehicle entering the target range based on the target direction. The processor connects the photographic lens and the sensor. The processor is used to control the target photography lens corresponding to the target direction among the photography lenses to capture a target image according to the sensing result of the sensor. The target image includes a license plate image of the target vehicle.

An embodiment of the present invention provides a method for photographing a license plate, which includes: sensing a target vehicle entering a target range based on a target direction via a plurality of sensors; and controlling a plurality of photography lenses according to the sensing results of the sensors. The target photography lens corresponding to the target direction captures the target image. The target image includes a license plate image of the target vehicle.

Based on the above, after the target vehicle entering the target range based on the target direction is sensed via at least one of the plurality of sensors provided, the sensing results of the sensor can be used to control the corresponding ones in the plurality of photography lenses. The target photography lens in the target direction captures a target image including a license plate image. In other words, a photography lens in an appropriate direction can be used to capture a license plate image of a vehicle, thereby improving the image quality of the captured license plate image.

In order to make the above-mentioned features and advantages of the present invention more obvious and easy to understand, embodiments are given below and described in detail with reference to the accompanying drawings.

FIG. 1 is a schematic diagram of a license plate photographing system according to an embodiment of the present invention. Referring to Figure 1, the license plate photographing system 10 includes devices 11(1)~11(N). The devices 11(1)~11(N) are physical devices arranged independently of each other. The license plate photography system 10 is also called a (roadside) parking timing system, a (roadside) parking photography system, a (roadside) parking accounting system or a license plate recognition system, etc. and is related to (roadside) parking license plate photography, license plate recognition, Timekeeping and/or billing related systems. Similarly, each of the devices 11(1)~11(N) is also called a (street) parking meter, a (street) parking meter, a (street) parking photography device, a (street) parking device Billing devices or license plate recognition devices and other devices related to license plate photography, license plate recognition, timing and/or charging of (roadside) parking.

The devices 11(1)~11(N) may respectively include photography lenses 121(1)~121(N), sensors 122(1)~122(N), and processors 123(1)~123(N). N can be an integer greater than or equal to 2. It should be noted that the present invention does not limit the number of N, the number of photographic lenses included in each device, the number of processors included in each device, and/or the number of sensors included in each device. For example, the number of photographic lenses 121(1) may be one or more, the number of sensors 122(1) may be one or more, and/or the number of processors 123(1) may be one or more. .

Each of the photography lenses 121(1)~121(N) may be used to capture images. For example, each of the photographic lenses 121(1)˜121(N) may generally refer to a photographic module including one or more lenses and one or more photosensitive elements. Alternatively, in an embodiment, each of the photographing lenses 121(1)˜121(N) is also called a photographing device or a camera.

Each of the sensors 122(1)~122(N) is a directional sensor and can be used to sense objects within a certain range. The sensing ranges of the sensors 122(1)˜122(N) are different, but the sensing ranges of the sensors 122(1)˜122(N) may at least partially overlap. For example, the sensing range (also called the first sensing range) of the sensor 122(1) (also called the first sensor) is different from that of the sensor 122(2) (also called the second sensor). sensing range (also called the second sensing range). However, both the first sensing range and the second sensing range may be included in a certain sensing range (also called a target range) and/or the first sensing range and the second sensing range may be at least within the target range. Partially overlapping.

In one embodiment, each of the sensors 122(1)˜122(N) is also called a distance sensor or a proximity sensor. The sensors 122(1)~122(N) can be used to sense the distance between an object and the sensors 122(1)~122(N). Taking the sensor 122(1) as an example, the sensor 122(1) can emit ultrasonic waves or light and receive ultrasonic waves or light reflected back by an object. Then, the sensor 122(1) can generate a sensing signal. The sensing signal may reflect the flight time and/or distance between the sensor 122(1) and the object. In one embodiment, the sensors 122(1)~122(N) may include at least one millimeter wave radar. Alternatively, in another embodiment, the sensors 122(1)~122(N) may include at least one infrared sensor or other types of distance sensors, which is not limited by the present invention.

The processors 123(1)~123(N) are respectively connected to the photography lenses 121(1)~121(N) and the sensors 122(1)~122(N). For example, each of the processors 123(1)~123(N) may be a central processing unit, a graphics processor, an embedded controller, or other programmable general-purpose or special-purpose microprocessor, digital Signal processors, programmable controllers, application special integrated circuits, programmable logic devices or other similar devices or combinations of these devices.

In one embodiment, the processors 123(1)~123(N) can respectively control the photography lenses 121(1)~121(N) to capture images. For example, the processor 123(1) may send a control signal to the photography lens 121(1) to instruct the photography lens 121(1) to activate, deactivate, and/or perform a shooting function to capture images. In one embodiment, the processors 123(1)~123(N) can process images from the photography lenses 121(1)~121(N) respectively. For example, the processors 123(1)~123(N) can perform image recognition on the images from the photography lenses 121(1)~121(N) to detect specific patterns in the images (such as the license plate number of the vehicle, etc.). In one embodiment, the processors 123(1)~123(N) can also control the sensors 122(1)~122(N) respectively and/or process the signals from the sensors 122(1)~122(N). sensing signal. For example, processor 123(1) may enable or disable sensor 122(1). Alternatively, the processor 123(1) may obtain the distance between the sensor 122(1) and an object based on the sensing signal provided by the sensor 122(1).

In one embodiment, the license plate photographing system 10 further includes a server 13 . The server 13 can serve as a control host, communication platform, information storage platform, information collection platform and/or information sharing platform for the devices 11(1)~11(N). In one embodiment, the devices 11(1)~11(N) can respectively transmit the sensing signals generated by the sensors 122(1)~122(N) and/or the photographic lenses 121(1)~121 through the communication interface. (N) The provided images or related information are sent to the server 13. The server 13 and the devices 11(1)~11(N) may be connected through wired or wireless connections.

In one embodiment, the server 13 can provide control signals to the devices 11(1)~11(N) respectively according to the information from the devices 11(1)~11(N). For example, the processor 123(1) can activate the photography lens 121(1) and/or control the photography lens 121(1) to capture images according to the control signal from the server 13. In addition, the server 13 can also instruct the devices 11(1)~11(N) to perform other operations through control signals, such as powering on, powering off, updating software (or firmware) and/or reporting device information, etc. The present invention No restrictions.

FIG. 2 is a schematic diagram of the shooting direction of the photographic lens and the sensing range of the sensor according to an embodiment of the present invention. Please refer to FIG. 1 and FIG. 2 , assuming that the devices 11 ( 1 ) and 11 ( 2 ) are respectively installed at the left corner and the right corner of the parking grid 20 . The parking spaces 20 may be (roadside) parking spaces. In one embodiment, the range covered by the parking grid 20 is also called a target range. However, in another embodiment, the target range may also be larger or smaller than the range covered by the parking grid 20 , which is not limited by the present invention.

The sensing ranges 210 and 220 may be respectively used to represent the sensing range of the sensor 122(1) (also referred to as the first sensing range) and the sensing range of the sensor 122(2) (also referred to as the second sensing range). sensing range). The sensing ranges 210 and 220 may each cover a range extending from the center line of the sensing range to both sides by a certain angle (for example, 20 degrees), as shown in FIG. 2 . Furthermore, the sensing ranges 210 and 220 may at least partially overlap within the target range. For example, the overlapping area of the sensing ranges 210 and 220 is marked with diagonal lines in FIG. 2 . However, it should be noted that the sensing range and device configuration position in Figure 2 are only schematic diagrams. In another embodiment, the configuration positions of the devices 11(1) and 11(2), the areas and/or shapes of the sensing ranges 210 and 220 can be adjusted, depending on practical needs.

In this embodiment, the photographing direction of the photographing lens 121(1) (also called the first photographing direction) and the photographing direction of the photographing lens 121(2) (also called the second photographing direction) respectively correspond to the sensing range 210 with 220. For example, the shooting direction of the photographing lens 121(1) may be directly opposite the sensing range of the sensor 122(1), and the shooting direction of the photographing lens 121(2) may be directly facing the sensing range of the sensor 122(2). , as shown in Figure 2. When an object (such as a vehicle) enters the sensing range 210, the processor 123(1) may activate the photography lens 121(1) to photograph the vehicle (also known as image of the target vehicle). Alternatively, when the target vehicle enters the sensing range 220, the processor 123(1) may activate the photography lens 121(2) to capture an image of the target vehicle based on at least the sensing result of the sensor 122(2). The captured images may include license plate images of the target vehicle.

3 and 4 are schematic diagrams of a target vehicle entering a sensing area according to an embodiment of the present invention. Referring to FIGS. 1 to 3 , it is assumed that the vehicle 31 enters the target range based on the direction (also called the target direction) 301 , and the vehicle 31 also enters the sensing range 210 of the sensor 122 ( 1 ). The direction 301 may be parallel or nearly parallel to the centerline of the sensing range 210 and/or the shooting direction of the photographing lens 121(1). At this time, the driver of the vehicle 31 may try to park the vehicle 31 into the parking space 20 from an external road. It should be noted that in the embodiment of FIG. 3 , the vehicle 31 may not have entered the sensing range 220 of the sensor 122(2) yet.

In this embodiment, the processor 123(1) can determine whether the distance between the vehicle 31 and the sensor 122(1) meets a preset distance (also known as first preset distance)D1. For example, the distance between vehicle 31 and sensor 122(1) may refer to the distance between vehicle 31 and sensor 122(1) in direction 301. For example, the processor 123(1) may determine whether the distance between the vehicle 31 and the sensor 122(1) is less than or equal to the preset distance D1. If the distance between the vehicle 31 and the sensor 122(1) is less than or equal to the preset distance D1, the processor 123(1) may determine that the distance between the vehicle 31 and the sensor 122(1) meets the preset distance D1. . However, if the distance between the vehicle 31 and the sensor 122(1) is greater than the preset distance D1, the processor 123(1) may determine that the distance between the vehicle 31 and the sensor 122(1) does not meet the preset distance. Distance D1.

If the distance between the vehicle 31 and the sensor 122(1) meets the preset distance D1, the processor 123(1) can continue to monitor the vehicle 31. During the monitoring process, if the vehicle 31 leaves the target range and/or the sensing range 210, the processor 123(1) may stop monitoring the vehicle 301. Alternatively, during the monitoring process, if the distance between the vehicle 31 and the sensor 122(1) does not meet the preset distance D1, the processor 123(1) may also stop monitoring the vehicle 301.

Please continue to refer to FIG. 4 , after starting to monitor the vehicle 31 , assume that the vehicle 31 continues to move along the direction 301 and continues to approach the device 11 ( 1 ). The processor 123(1) can determine whether the distance between the vehicle 31 and the sensor 122(1) meets another preset distance (also known as the second preset distance) based on the sensing result of the sensor 122(1). )D2. The preset distance D2 is smaller than the preset distance D1. For example, the processor 123(1) may determine whether the distance between the vehicle 31 and the sensor 122(1) is less than or equal to the preset distance D2. If the distance between the vehicle 31 and the sensor 122(1) is less than or equal to the preset distance D2, the processor 123(1) may determine that the distance between the vehicle 31 and the sensor 122(1) meets the preset distance D2. . However, if the distance between the vehicle 31 and the sensor 122(1) is greater than the preset distance D2, the processor 123(1) may determine that the distance between the vehicle 31 and the sensor 122(1) does not meet the preset distance. Distance D2.

If the distance between the vehicle 31 and the sensor 122(1) meets the preset distance D2, the processor 123(1) may control the photography lens 121(1) to capture an image of the target vehicle (also referred to as a target image). In one embodiment, before determining that the distance between the vehicle 31 and the sensor 122(1) meets the preset distance D2, the camera lens 121(1) may be in an idle, dormant or powered off state. In response to the distance between the vehicle 31 and the sensor 122(1) meeting the preset distance D2, the processor 123(1) may activate the photography lens 121(1) and control the photography lens 121(1) to capture the target image. In addition, in one embodiment, the camera lens 121(1) may be activated to capture the target image of the target vehicle after it is determined that the distance between the vehicle 31 and the sensor 122(1) meets the preset distance D1. .

It should be noted that in the embodiment of FIGS. 3 and 4 , the vehicle 31 enters the parking space 20 along the direction 301 by moving forward. Therefore, the target image captured by the photography lens 121(1) may include a license plate image near the front of the vehicle 31 (eg, below the front of the vehicle). This license plate image can present the license plate number of the vehicle 31 . In one embodiment, the processor 123(1) may further analyze the target image through image analysis technology to obtain the license plate number of the vehicle 31.

In an embodiment of FIG. 4 , after the vehicle 31 enters the sensing range 210 , the vehicle 31 may also enter the sensing range of the sensor 122 ( 2 ) (eg, the sensing range 220 of FIG. 2 ). Therefore, the processor 123(1) can determine the target direction of the vehicle 31 (ie, the direction 301) according to the sensing results of the sensors 122(1) and 122(2). Then, the processor 123(1) can control the target photography lens (ie, the photography lens 121(1)) to capture the target image of the vehicle 31 according to the target direction.

FIG. 5 is a schematic diagram of a target vehicle entering a sensing area according to an embodiment of the present invention. Please refer to FIG. 1 and FIG. 5 , assuming that the vehicle 51 enters the target range based on the direction (ie, the target direction) 501 , and the vehicle 51 also enters the sensing range 220 of the sensor 122 ( 2 ). The direction 501 may be parallel or nearly parallel to the centerline of the sensing range 220 and/or the shooting direction of the photographing lens 121(2). At this time, the driver of the vehicle 51 may try to park the vehicle 51 into the parking space 20 from an external road.

Compared with the embodiments of FIGS. 3 and 4 , in the embodiment of FIG. 5 , the vehicle 51 enters the parking space 20 along the direction 501 in a backwards manner. According to the sensing result of at least one of the sensors 122(1) and 122(2), the processor 123(1) may detect that the vehicle 51 currently enters the parking space 20 along the direction 501. Therefore, the processor 123(1) can control the photography lens 121(2) to capture the target image of the vehicle 51. For example, the processor 123(1) may perform a determination operation similar to the embodiments of FIGS. 3 and 4 (for example, determine whether the distance between the vehicle 51 and the sensor 122(2) meets the preset distance D1 or D2) and Accordingly, the photographing lens 121(2) is activated to capture the target image of the vehicle 51. The captured target image may include a license plate image near the rear of the vehicle 51 (for example, below the rear of the vehicle). For example, the license plate image may represent the license plate number of the vehicle 51 . In one embodiment, the processor 123(2) may further analyze the target image through image analysis technology to obtain the license plate number of the vehicle 51.

In one embodiment, when the target vehicle that has parked in the parking space 20 wants to leave the parking space 20, whether the target vehicle leaves the parking space 20 based on a certain target direction may also be based on the sensors 122(1) and 122(2). The sensing results of at least one of them are obtained. Then, the photography lens corresponding to the target direction can be activated to capture the target image of the target vehicle. For example, assuming that the vehicle 31 in FIG. 4 leaves the parking space 20 in the opposite direction based on the direction 301, then according to the sensing result of at least one of the sensors 122(1) and 122(2), the photography lens 121(1) ) may be activated to capture a target image of the vehicle 31 . Or, assuming that the vehicle 51 in FIG. 5 leaves the parking space 20 in the opposite direction based on the direction 501, according to the sensing result of at least one of the sensors 122(1) and 122(2), the photography lens 121(2) ) may be activated to capture a target image of the vehicle 51 . In addition, the camera lens used to photograph the vehicle entering the parking space may be the same as or different from the camera lens used to film the vehicle leaving the parking space, depending on which angle the vehicle currently leaves the parking space. In addition, in one embodiment, the residence time of the target vehicle in the parking grid can also be obtained based on the target image captured when the target vehicle enters the parking grid and the target image captured when the target vehicle leaves the parking grid.

It should be noted that in the aforementioned embodiments of FIG. 3 , FIG. 4 and FIG. 5 , the operation of analyzing the sensing signal of the sensor and/or controlling the photographic lens is performed by the respective devices 11 ( 1 ) and 11 ( 2 ). Processors 123(1) and 123(2) execute. However, in some embodiments of FIG. 3 , FIG. 4 and FIG. 5 , the operation of analyzing the sensing signal of the sensor and/or sending a control signal to control the photography lens to capture the target image may also be performed by FIG. The server 13 of 1 is executed uniformly, and the processors 123(1) and 123(2) can respectively instruct the photography lenses 121(1) and 121(2) to capture the target image according to the control signal from the server 13.

In one embodiment, after obtaining the target image, the license plate number in the target image can be obtained through image recognition. This license plate number and the parking information associated with this license plate number (such as the location of the parking space, the charging rules of the parking space, the time the vehicle entered the parking space, the time the vehicle left the parking space, and/or the time the vehicle stayed in the parking space ) can be uploaded to the server 13. The server 13 can generate corresponding charging information based on this parking information (for example, 30 yuan for one hour of parking). This charging information can be sent to the online account, email and/or SMS mailbox associated with this license plate number. In this way, the driver of the target vehicle can check his or her online account, email and/or SMS mailbox through a mobile phone or other device to obtain the charging information. Then, based on the charging information, the driver of the target vehicle can connect to the server 13 via a mobile phone to perform payment methods such as online payment or remittance to an ATM to pay the relevant parking fees.

FIG. 6 is a schematic diagram of a device and parking grid configuration according to an embodiment of the present invention. Referring to Figure 6, the license plate photographing system 60 includes devices 61(1)~61(4). The devices 61(1)~61(4) are respectively arranged in certain corners of the parking grids 601~603. For example, these corners may face the road. Device 61(1) includes photographic lens 621(1). Device 61(2) includes photographic lenses 621(2) and 621(3). Device 61(3) includes photographic lenses 621(4) and 621(5). Device 61(4) includes photographic lens 621(6).

One of the photographic lenses 621(1) and 621(2) may be selectively controlled to photograph the entrance and/or according to the sensing result of at least one sensor provided on the devices 61(1) and 61(2). Or the target image of the vehicle leaving the parking space 601. One of the photographic lenses 621(3) and 621(4) may be selectively controlled to photograph the entrance and/or according to the sensing result of at least one sensor provided on the devices 61(2) and 61(3). Or the target image of the vehicle leaving the parking space 602. One of the photographic lenses 621(5) and 621(6) may be selectively controlled to photograph the entrance and/or according to the sensing result of at least one sensor provided on the devices 61(3) and 61(4). Or the target image of the vehicle leaving the parking space 603. The details of the relevant control operations have been described in detail above and will not be repeated here.

FIG. 7 is a flow chart of a license plate photographing method according to an embodiment of the present invention. Referring to FIG. 7 , in step S701 , a target vehicle entering the target range based on the target direction is sensed via multiple sensors. In step S702, the target photography lens corresponding to the target direction among the plurality of photography lenses is controlled to capture the target image according to the sensing result of the sensor. The target image includes a license plate image of the target vehicle.

However, each step in Figure 7 has been described in detail above and will not be described again here. It is worth noting that each step in Figure 7 can be implemented as multiple program codes or circuits, and the present invention is not limited thereto. In addition, the method in Figure 7 can be used in conjunction with the above example embodiments or can be used alone, and is not limited by the present invention.

In summary, embodiments of the present invention can provide devices including sensors and photographic lenses at multiple locations facing the road near (street) parking spaces (for example, near corners). The sensors of these devices can be used to sense target vehicles entering the target range based on the target direction. The sensing results of these sensors can be used to control the target photography lens corresponding to the target direction among the photography lenses to capture a target image including the license plate image of the target vehicle. In addition, in one embodiment, the shooting direction of the target image by the target photography device is very close to the moving direction of the target vehicle (such as the direction of entering the parking space or the direction of leaving the parking space), so the image quality of the obtained target image can be determined The efficiency of recognition of license plate numbers in target images can also be improved.

Although the present invention has been disclosed above through embodiments, they are not intended to limit the present invention. Anyone with ordinary knowledge in the technical field may make some modifications and modifications without departing from the spirit and scope of the present invention. Therefore, The protection scope of the present invention shall be determined by the appended patent application scope.

10. 60: License plate shooting system 11(1)~11(N), 61(1)~61(4): Device 121(1)~121(N), 621(1)~621(6): Photographic lens 122(1)~122(N): Sensor 123(1)~123(N): Processor 13:Server 20, 601, 602, 603: parking spaces 210, 220: Sensing range 31, 51: Vehicle 301, 501: Direction S701, S702: steps

FIG. 1 is a schematic diagram of a license plate photographing system according to an embodiment of the present invention. FIG. 2 is a schematic diagram of the shooting direction of the photographic lens and the sensing range of the sensor according to an embodiment of the present invention. 3 and 4 are schematic diagrams of a target vehicle entering a sensing area according to an embodiment of the present invention. FIG. 5 is a schematic diagram of a target vehicle entering a sensing area according to an embodiment of the present invention. FIG. 6 is a schematic diagram of a device and parking grid configuration according to an embodiment of the present invention. FIG. 7 is a flow chart of a license plate photographing method according to an embodiment of the present invention.

S701, S702: steps

Claims (10)

A license plate shooting system includes: a plurality of photographic lenses; a plurality of sensors for sensing a target vehicle entering a target range based on a target direction; and at least one processor connecting the plurality of photographic lenses and the a plurality of sensors and used to control a target photography lens corresponding to the target direction among the plurality of photography lenses to capture a target image according to the sensing results of the plurality of sensors, wherein the target image includes the target vehicle A license plate image, wherein the operation of the at least one processor controlling the target photography lens corresponding to the target direction among the plurality of photography lenses to capture the target image according to the sensing results of the plurality of sensors includes: according to At least two of the plurality of sensors disposed at opposite ends of the same parking space jointly set the traveling direction of the target vehicle as the target direction based on the sensing result of the target vehicle; start the plurality of photography The photographic lens located in the target direction in the lens serves as the target photographic lens; if the distance between the target vehicle and the target photographic lens in the target direction meets a first preset distance, the target vehicle is continuously monitored; and if The distance between the target vehicle and the target photography lens in the target direction complies with a second preset distance, and the target photography lens is controlled to capture the target image, wherein the second preset distance is smaller than the first preset distance. distance. The license plate shooting system as described in item 1 of the patent application, wherein the plurality of sensors includes a first sensor and a second sensor, and a first sensing range of the first sensor is different In a second sensing range of the second sensor, the first sensing range and the second sensing range at least partially overlap within the target range. The license plate shooting system as described in item 2 of the patent application, wherein the plurality of photography lenses include a first photography lens and a second photography lens, and a first photography direction of the first photography lens corresponds to the first sensing range, and a second shooting direction of the second photography lens corresponds to the second sensing range. For the license plate photography system described in Item 3 of the patent application, the target photography lens is one of the first photography lens and the second photography lens. As for the license plate photographing system described in claim 1 of the patent application, the plurality of sensors include at least one millimeter wave radar. A method for photographing a license plate, including: sensing a target vehicle entering a target range based on a target direction via a plurality of sensors; and controlling a plurality of photographic lenses corresponding to the target vehicle according to the sensing results of the plurality of sensors. A target photographic lens in the target direction captures a target image, wherein the target image includes a license plate image of the target vehicle, wherein the sensor corresponding to the target among the plurality of photographic lenses is controlled according to the sensing results of the plurality of sensors. The step of capturing the target image by the target photography lens in the direction includes: according to the plurality of sensors arranged at opposite ends of the same parking grid. The two sensors jointly set the traveling direction of the target vehicle as the target direction according to the sensing results of the target vehicle; activate the photography lens located in the target direction among the plurality of photography lenses as the target photography lens; If the distance between the target vehicle and the target photography lens in the target direction meets a first preset distance, continuously monitor the target vehicle; and if the distance between the target vehicle and the target photography lens in the target direction The distance complies with a second preset distance to control the target photography lens to capture the target image, wherein the second preset distance is smaller than the first preset distance. The method for photographing a license plate as described in item 6 of the patent application, wherein the plurality of sensors includes a first sensor and a second sensor, and a first sensing range of the first sensor is different In a second sensing range of the second sensor, the first sensing range and the second sensing range at least partially overlap within the target range. As for the license plate photographing method described in item 6 of the patent application, the plurality of photographic lenses include a first photographic lens and a second photographic lens, and a first photographing direction of the first photographic lens corresponds to the first sensing range, and a second shooting direction of the second photography lens corresponds to the second sensing range. For the license plate photographing method described in Item 8 of the patent application, the target photographic lens is one of the first photographic lens and the second photographic lens. For the license plate photographing method described in Item 6 of the patent application, the plurality of sensors includes at least one millimeter wave radar.

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