Intelligent shooting device for license plate detection and use method thereof

Abstract

The present invention relates to the technical field of license plate detection and shooting equipment, and specifically discloses an intelligent shooting equipment for license plate detection and a method of using the same, comprising a camera housing, an image shooting device arranged in the camera housing, and a power-on device arranged in the camera and used to control the circuit connectivity of the image shooting device; the power-on device comprises a power supply socket fixedly connected in the camera housing and connectable to an external power supply, a power connection structure detachably connected to the power supply socket and used to power the image shooting device, and a plug-in structure used to control the on-off of the power connection structure, thereby solving the problem that after the detection picture of the traditional license plate detection and shooting equipment is unstable, the license plate detection and shooting equipment is manually restarted or commanded to be corrected, while no mechanical and safe automatic restart structure is provided for the intelligent shooting equipment to realize the correction by remote and automatic restart function.

Description

Technical Field

[0001] The present application relates to the technical field of license plate detection and shooting equipment, and specifically discloses an intelligent shooting equipment for license plate detection and a method for using the same. Background Art

[0002] In the prior art, license plate detection and shooting equipment usually uses image processing technology to detect and shoot license plates of vehicles. These devices are usually fixedly installed at the entrance of garages, community gates, and now at the charging ports of electric vehicle charging piles, and use cameras to monitor incoming vehicles in real time. When a vehicle enters, the device automatically recognizes the license plate number and takes an image of the vehicle. These images can be used for subsequent license plate recognition, vehicle tracking and other applications.

[0003] Traditional license plate detection and shooting equipment usually adopts a single camera or a simple dual-camera configuration, and uses the principle of perspective projection for image acquisition and license plate positioning. Image acquisition, image transmission and image display are realized through image acquisition module, license plate positioning module, license plate recognition module and result display module.

[0004] Traditional license plate detection and shooting equipment is installed at high places. For different application scenarios, the installed license plate detection and shooting equipment is either exposed in an open-air environment or set up in an underground sheltered environment. No matter which environment it is in, during use, the license plate detection and shooting equipment may not shoot clearly, the transmitted image may be discontinuous, spots may appear on the screen, etc. When such situations occur, they can be corrected by manually restarting the license plate detection and shooting equipment or by command. However, in the prior art, there is no mechanical and safe automatic restart structure for the intelligent shooting equipment to achieve correction with a remote and automatic restart function.

[0005] Therefore, in view of this, the inventor provides an intelligent shooting device for license plate detection and a method of using the same to solve the above-mentioned problem. Summary of the invention

[0006] The purpose of the present invention is to solve the problem that traditional license plate detection and shooting equipment is corrected by manually or by command restarting the license plate detection and shooting equipment after the detection image becomes unstable, but there is no mechanical and safe automatic restart structure for the intelligent shooting equipment to achieve correction with a remote and automatic restart function.

[0007] In order to achieve the above-mentioned object, the basic scheme of the present invention provides an intelligent shooting device for license plate detection, comprising a camera housing, an image shooting device arranged in the camera housing, and a power supply device arranged in the camera and used to control the circuit connection of the image shooting device;

[0008] The power supply device includes a power supply socket fixedly connected to the camera housing and connectable to an external power supply, a power connection structure detachably connected to the power supply socket and used to supply power to the image capture device, and a plug-in structure for controlling the on and off of the power connection structure.

[0009] Furthermore, the image capturing device includes an image acquisition module, a license plate positioning module, a license plate recognition module and a result display module;

[0010] The image acquisition module is used to collect the real-time video stream of the vehicle and transmit the video stream to the license plate positioning module;

[0011] The license plate positioning module uses a deep learning algorithm to locate the license plate area of ​​each frame image in the video stream and transmits the positioning result to the license plate recognition module;

[0012] The license plate recognition module recognizes the license plate number based on the positioning result and transmits the recognition result to the result display module;

[0013] The result display module displays the recognition results on the display screen and can update the display content in real time.

[0014] Furthermore, the power connection structure includes a power connection plug controlled by the plug-in structure and a power connection wire connected to the power connection plug and used to supply power to the image capture device.

[0015] Furthermore, the plug-in structure includes a driven platform for fixing the power plug, a spring return pressing structure for actively pressing against the driven platform so that the power plug can be connected to the power socket, and a pulling out structure for actively pulling out the power plug.

[0016] Furthermore, the plug-in structure also includes a light indicator structure for monitoring the position status of the power plug.

[0017] Furthermore, the light indication structure includes a fault state display structure and a normal state display structure, and also includes an external power supply circuit arranged in the camera housing and used to supply power to the fault state display structure and the normal state display structure.

[0018] Furthermore, the pulling-out structure includes a driving motor, a belt conveying mechanism driven by an output shaft of the driving motor, a driven slide rod slidably connected to the driven platform, and a pulling-out structure provided on the belt conveying mechanism and used to push the driven slide rod away from the power socket.

[0019] Furthermore, it also includes a ventilation structure arranged on the camera housing.

[0020] Furthermore, the ventilation structure includes an air outlet opened at the bottom of the camera housing and an air guide structure arranged on the camera housing inside the air outlet and driven by a belt conveying mechanism.

[0021] The basic scheme of the present invention also provides a method for using an intelligent photographing device for license plate detection, comprising the following steps:

[0022] Step S01: insert the power socket into an external power socket so that the power plug is connected to the power wire;

[0023] Step S02: starting the power supply device to turn on the power of the image capture device;

[0024] Step S03: by controlling the plug-in structure, the power connection structure is connected to the power supply socket, and the image capture device starts to work;

[0025] Step S04: within a set time period, the image capture device automatically performs license plate detection;

[0026] Step S05: Displaying the license plate detection result in real time through the result display module;

[0027] Step S06: During the working process, when it is found that the image capture device has no display or the display is blurred, the plug-in structure is controlled to separate the power connection structure from the power supply socket, and the power supply of the image capture device is disconnected. After the power supply is disconnected for a certain period of time, the plug-in structure is controlled again to connect the power connection structure to the power supply socket, and the image capture device starts to work.

[0028] The principle and effect of this scheme are:

[0029] 1. Compared with the prior art, the present invention is provided with a power-on device inside the camera housing, and the internal power-on device is used to realize mechanical and safe plugging and unplugging of the power socket and the power connection structure to replace manual plugging and unplugging, which can realize long-distance automatic control and replace programmed self-starting with mechanical automatic plugging and unplugging. It solves the problem that the traditional license plate detection and shooting equipment is corrected by manual license plate detection and shooting equipment connection after the detection picture is unstable, but there is no mechanical and safe automatic restart structure for the intelligent shooting equipment to realize the correction with remote and automatic restart function.

[0030] 2. Compared with the prior art, the present invention ensures the circuit connectivity of the image capture device by connecting the power supply socket with the power supply structure during the operation of the license plate detection and shooting equipment through the power supply device. During the operation, when it is found that the image capture device has no display or the display is blurred, the power supply of the image capture device is disconnected by controlling the plug-in structure to separate the power supply plug from the power supply socket. After the power supply is disconnected for a certain period of time, the power supply plug is connected to the power supply socket again by controlling the plug-in structure, so that the image capture device starts working again, and the image capture device is restarted by mechanical plug-in.

[0031] 3. Compared with the prior art, the present invention replaces the program self-start with a mechanical plug-in structure. For devices such as cameras that are far away from the manual restart environment, the program-controlled start and stop solution cannot completely cut off the power to eliminate the influence of the accumulated charge caused by power connection. At the same time, the program self-start still needs to be completed by manually clicking the start button remotely.

[0032] 4. Compared with the prior art, the present invention uses a light indicator structure linked to a plug-in structure to accurately determine the working status of the on-site license plate detection and shooting equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 A schematic diagram of an intelligent photographing device for license plate detection and a method for using the same proposed in an embodiment of the present application is shown;

[0035] Figure 2 A schematic diagram showing the internal structure of an intelligent photographing device for license plate detection and a method for using the same, proposed in an embodiment of the present application;

[0036] Figure 3 A schematic diagram showing a belt conveying mechanism of an intelligent photographing device for license plate detection and a method for using the same proposed in an embodiment of the present application;

[0037] Figure 4 A schematic diagram of the plug-in structure of an intelligent shooting device for license plate detection and a method for using the same proposed in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0038] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0039] The figure marks in the drawings of the specification include: camera housing 1, lens 2, functional module 3, drive motor 4, air outlet 5, rotating shaft 6, support frame 7, belt 8, power socket 9, power plug 10, guide column 11, driven slide rod 12, light groove 13, normal state display structure 14, input shaft 15, lever 16, push plate 17, conductive sheet 18, push-out ring plate 19.

[0040] An intelligent camera device for license plate detection and a method for using the same, for example Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown:

[0041] It comprises a camera housing 1, an image capturing device installed in the camera housing 1, and a power-on device installed in the camera and used for controlling the circuit connection of the image capturing device;

[0042] The power supply device includes a power supply socket 9 fixedly installed in the camera housing 1 and connectable to an external power source, a power connection structure detachably connected to the power supply socket 9 and used to power the image capture device, and a plug-in structure for controlling the on and off of the power connection structure.

[0043] The image capture device includes an image acquisition module, a license plate positioning module, a license plate recognition module and a result display module. The license plate positioning module and the vehicle recognition module are both functional modules 3. The result display module is a display screen mounted on an external device. In this embodiment, it is a support column installed on the ground, and a display window is opened on the wall of the support column to install the display screen. The image acquisition module is used to collect the real-time video stream of the vehicle and transmit the video stream to the license plate positioning module; the license plate positioning module uses a deep learning algorithm to locate the license plate area of ​​each frame image in the video stream, and transmits the positioning result to the license plate recognition module; the license plate recognition module recognizes the license plate number based on the positioning result, and transmits the recognition result to the result display module; the result display module displays the recognition result on the display screen and can update the display content in real time.

[0044] In this embodiment, the camera housing 1 is made of waterproof and dustproof material, which can adapt to the outdoor environment and protect the internal structure from the influence of the external environment. The power supply socket 9 adopts a standard three-phase socket to facilitate the connection with the external power supply. The power connection structure adopts a detachable design to facilitate maintenance and replacement.

[0045] Specifically, the power connection structure includes a power connection plug 10 controlled by the plug-in structure and a power connection wire connected to the power connection plug 10 and used to power the image capture device. The power connection plug 10 can be inserted into the power supply socket 9, powered by the outside world and transmits electrical energy to the image capture device through the electrical connection relationship between the power supply socket 9 and the power connection plug 10.

[0046] The plug-in structure includes a driven platform for fixing the power plug 10, a spring return pressing structure for actively pressing against the driven platform for the power plug 10 to connect to the power socket 9, and a pulling out structure for actively pulling out the power plug 10. The plug-in structure also includes a light indicating structure for monitoring the position status of the power plug 10.

[0047] A slide groove is opened in the camera housing 1, and a section of the bottom of the driven platform is installed in the slide groove, and the sliding direction of the driven platform is limited by the slide groove. On the driven platform, a plug fixing slot is integrally formed, and the power plug 10 is fixedly installed on the driven platform through the plug fixing slot and screws. The spring reset and tightening structure includes a fixed base installed at the right end of the slide groove by screws, a guide column 11 integrally formed on the inner side of the fixed base, and a reset spring sleeved on the outer side of the guide column 11. The right end of the reset spring is fixedly connected to the inner side of the fixed base, and the left end of the reset spring is fixedly connected to the right end face of the driven platform.

[0048] A driven structure is also installed on the driven platform, which is driven by the extraction structure and can move synchronously with the extraction structure. The driven structure includes a driven slide bar 12, two support plates fixedly installed on the driven platform for supporting the driven slide bar 12, and a push-out structure installed on the driven slide bar 12 between the two support plates and used to push the driven slide bar 12 toward the extraction structure.

[0049] Specifically, the support plate is installed on the driven platform and is located on the right side of the power plug 10, and each of them has a support hole. The driven slide rod 12 passes through the support hole and can slide between the two support plates. The two ends of the driven slide rod 12 extend from the corresponding support plates on both sides. The push-out structure includes a push-out ring plate 19 fixedly installed on the support rod and a push-out spring installed on the push-out ring plate 19 away from the push-out structure. The end of the driven slide rod 12 close to the push-out structure is provided with an inclined groove toward the fixed base and a main inclined surface is formed toward the fixed base. The end of the driven slide rod 12 away from the push-out structure is welded with an insulating platform, and a conductive sheet 18 is installed on the insulating platform.

[0050] The pull-out structure includes a driving motor 4, a belt conveying mechanism driven by the output shaft of the driving motor 4, and a pull-out structure provided on the belt conveying mechanism and used to pull the driven slide bar 12 away from the power supply socket 9. It also includes a ventilation structure provided on the camera housing 1, the ventilation structure includes an air vent 5 opened at the bottom of the camera housing 1 and an air guide structure provided on the camera housing 1 inside the air vent 5 and driven by the belt conveying mechanism.

[0051] The driving motor 4 is directly installed in the camera housing 1 by screws. A base for installing the driving motor 4 is provided in the camera housing 1. The air outlet 5 is provided on the camera housing 1 on both sides of the base. A support frame 7 is installed on both sides of the air outlet 5. The belt transmission mechanism includes a rotating shaft 6 installed through the support frame 7, a driven rotating wheel installed on the rotating shaft 6, and a belt 8 installed between the driven rotating wheels on both sides. A rotating hole for supporting the rotating shaft 6 and allowing the rotating shaft 6 to rotate inside is integrally formed on the support frame 7. An input shaft 15 is coaxially fixedly installed on the output shaft of the driving motor 4. A driving rotating wheel is installed on the input shaft 15, and the driving rotating wheel extends into the inner side of the belt 8.

[0052] In this embodiment, a plurality of driven tooth grooves are equidistantly formed on the inner side of the belt 8, and a circle of convex teeth is integrally formed on the outer sides of the driving wheel and the driven wheel, and the convex teeth mesh into the driven tooth grooves. The air guide structure includes air guide grooves circumferentially formed on the driven wheel and the driving wheel, and air guide blades are formed by cutting adjacent air guide grooves in the driven wheel and the driving wheel, respectively, and the air guide blades are inclined in the clockwise direction. When the output shaft of the driving motor 4 rotates, the driving wheel is driven to rotate synchronously, and the driven wheel is driven to rotate synchronously through the belt 8 transmission, and the internal air guide blades are driven to rotate synchronously, so as to speed up the air circulation speed in the camera housing 1.

[0053] The shifting structure includes a plurality of shifting rods 16 equidistantly bonded to the belt 8 and a butt plate 17 installed in the camera housing 1 above the belt 8. The top of the shifting rod 16 is level with the lower end surface of the butt plate 17 and can slide under the butt plate 17. The spacing between adjacent shifting rods 16 is equal to the reciprocating sliding distance of the driven slide 12. The driven slide 12 can be shifted by the shifting rod 16 and can also be butted by the butt plate 17. The left end of the butt plate 17 is provided with an inclined groove toward one side of the driven slide 12 and is formed with a secondary inclined surface facing the driven slide 12. The main inclined surface and the secondary inclined surface are arranged opposite to each other. When the driven slide 12 is pushed rightward by the shifting rod 16, the continuous rightward sliding of the main inclined surface is blocked by the secondary inclined surface, and the secondary inclined surface converts the rightward sliding into sliding along the direction of the secondary inclined surface, thereby pushing the driven slide 12 out to the side away from the driving motor 4 until the shifting rod 16 is separated from the driven slide 12.

[0054] The light indication structure includes a fault state display structure and a normal state display structure 14 , and also includes an external power supply circuit installed in the camera housing 1 and used to supply power to the fault state display structure, the normal state display structure 14 and the drive motor 4 .

[0055] The normal state display structure 14 includes a first positive gasket, a first negative gasket and a normal state display light electrically connected to the first positive gasket and the first negative gasket. The fault state display structure includes a second positive gasket, a second negative gasket and a fault state display light electrically connected to the second positive gasket and the second negative gasket. A lamp groove 13 is opened through the camera housing 1, and the length of the lamp groove 13 is equal to the reciprocating sliding distance of the driven slide bar 12. The normal state display structure 14 and the fault state display structure are both placed in the lamp groove 13, and the normal state display structure 14 is installed on the left side of the fault state display structure, and the installation position of the normal state display structure 14 is the same as the position where the power plug 10 is inserted into the power socket 9. The normal status indicator light and the fault status indicator light cover the lamp slot 13, and the first positive gasket, the first negative gasket, the second positive gasket, and the second negative gasket are respectively located inside the normal status indicator light and the fault status indicator light, and the depth of the first positive gasket and the first negative gasket is greater than the depth of the second positive gasket and the second negative gasket.

[0056] The external power supply circuit is also electrically connected to the power plug 10. A large capacitor is arranged in the external power supply circuit. When the power plug 10 is connected to the power supply socket 9, the large capacitor is charged and the output shaft of the drive motor 4 rotates forward. When the machine needs to restart automatically, the output shaft of the drive motor 4 is reversed and the power plug 10 is pulled out. At this time, no electric energy is supplied to the external power supply circuit, and the large capacitor is discharged to power the drive motor 4, and the large capacitor is used to power the normal status indicator light and the fault status indicator light.

[0057] In this embodiment, the license plate positioning module is equipped with a NanoDet network, that is, the same set of convolutions is used to predict the detection frame for the multi-scale Feature Map from FPN, and then each layer uses a learnable Scale value as a coefficient to scale the predicted frame. At the same time, Group Normalization (GN) is used as a normalization method. The frame regression and classification are calculated using the same set of convolutions, and then split into two parts.

[0058] The specific loading process is as follows:

[0059] First, through research, we found the requirements of lightweight and scalability, selected the appropriate nanodet algorithm, and conducted model training after developing its algorithm framework and structure:

[0060] After that, configure the environment, install the necessary library files and the corresponding versions of torch and torchvison; then install the nanodet package through python setup.py develop, and make a dataset. Convert the made VOC dataset to COCO dataset and perform data enhancement, that is, enhance the complexity of the dataset and the adaptability of the training model. Then modify the corresponding configuration file, and finally train it through train.py in the tools file, and then use the trained model file to test the algorithm through demo.py in the demo file, and finally deploy it on the mobile terminal through ncnn reasoning.

[0061] NanoDet is a FCOS-style single-stage anchor-free target detection model. The FCOS feature is that the model learns the distance from each position in the feature map to the four sides of the detection box. It uses ATSS for target sampling and uses the Generalized Focal Loss loss function to perform classification and box regression. This function can remove the Centerness branch of FCOS, eliminating a large number of convolutions on this branch, thereby reducing computational overhead.

[0062] NanoDet uses ShuffleNetV2 1.0x as the backbone network, removes the last layer of convolution of the network, and extracts 8, 16, and 32 times downsampled features and inputs them into PAN for multi-scale feature fusion. In the FPN module, all convolutions are removed, and only the 1×1 convolution after feature extraction from the backbone network is retained to align the feature channel dimension. Both upsampling and downsampling are completed using interpolation, and multi-scale feature maps are directly added, which makes the computational complexity of the entire feature fusion module very small.

[0063] The NanoDet network can use GPU to train CPU inference with higher accuracy and fast target detection speed. The three modules (Head, Neck, Backbone) of the single-stage detection model are lightweight, and the model file size is only a few megabytes (less than 1M). The cost of running the model is reduced and more economical. It can be used in real time on Windows, Ubuntu, and Arm mobile phones. It has strong scalability and portability, and can share a motherboard with the charging pile CPU.

[0064] When the present invention is used, it comprises the following steps:

[0065] Step S01: insert the power socket 9 into an external power socket, so that the power plug 10 is connected to the power wire;

[0066] Step S02: starting the power supply device to turn on the power of the image capture device;

[0067] Step S03: by controlling the plug-in structure, the power plug 10 is connected to the power socket 9, and the image capture device starts to work;

[0068] Step S04: within a set time period, the image capture device automatically performs license plate detection;

[0069] Step S05: Displaying the license plate detection result in real time through the result display module;

[0070] Step S06: During the operation, when it is found that the image capture device has no display or the display is blurred, the plug-in structure is controlled to separate the power plug 10 from the power socket 9, and the power supply of the image capture device is disconnected. After the power supply is disconnected for a certain period of time, the plug-in structure is controlled again to connect the power plug 10 to the power socket 9, and the image capture device starts to work.

[0071] Specifically, the working status of the plug-in structure is as follows:

[0072] When the power plug 10 is connected to the power socket 9, the output shaft of the driving motor 4 rotates counterclockwise. In this embodiment, the counterclockwise rotation direction of the output shaft of the driving motor 4 is taken as the positive direction, and the driving pulley is driven by the driving motor 4 to rotate counterclockwise synchronously, and the driven pulley is driven by the belt 8 to rotate counterclockwise synchronously. During the rotation process, the air guide blades in the driving pulley and the driven pulley will also rotate synchronously;

[0073] During the rotation of the belt 8, the lever 16 will be driven to move synchronously. The lever 16 slides from right to left toward the driven slide bar 12 and contacts the main inclined surface on the driven slide bar 12. At this time, as the lever 16 continues to move to the left, the driven slide bar 12 will slide in the direction away from the driving motor 4. Before sliding, the insulating platform installed at the end of the driven slide bar 12 is not located between the first positive gasket and the first negative gasket. When the lever 16 pushes into the driven slide bar 12 and slides to the end, the insulating platform is placed between the first positive gasket and the first negative gasket, and the two ends of the conductive sheet 18 on the insulating platform are respectively in contact with the first positive gasket and the first negative gasket, so as to respectively connect the first positive gasket to the positive electrode of the normal state display lamp, and connect the first negative gasket to the negative electrode of the normal state display lamp, so as to realize instant lighting. The normal state display lamp is lit at equal time intervals by the continuous rotation of the belt 8.

[0074] When the machine needs to restart automatically, the output shaft of the control drive motor 4 is reversed, that is, it rotates in the clockwise direction. At this time, the large capacitor in the external power supply circuit is discharged to drive, and the belt 8 is reversed to drive the lever 16 to reverse synchronously. At this time, the lever 16 will abut against the left side of the driven slide 12 and push it to the right against the plate 17. At this time, the normal state indicator light is no longer on, and the power plug 10 is pulled out from the power supply socket 9 until the main inclined surface and the secondary inclined surface of the driven slide 12 abut against each other, and the secondary inclined surface and the secondary inclined surface convert the rightward sliding into sliding along the secondary inclined surface, and then the driven slide 12 is pushed away from the drive motor 4 until the lever 16 is separated from the driven slide 12. During this process, the insulating platform at the end of the driven slide 12 is always located between the second positive gasket and the second negative gasket, so as to respectively connect the second positive gasket to the positive pole of the fault status indicator light, and connect the second negative gasket to the negative pole of the fault status indicator light, so as to achieve continuous power, and continuously light up the fault status indicator light during the entire automatic restart period;

[0075] When the lever 16 is disengaged from the driven slide 12, the return spring will realize the rebound of the driven platform, and the power plug 10 will be reinserted into the power socket 9 by the rebound of the return spring, realizing mechanical automatic restart. In this process, the driven slide 12 will be reset by the push-out spring and made to reach the position where it can be pushed by the lever 16. After the power plug 10 is reinserted into the power socket 9, the large capacitor will no longer discharge, and the external power supply will be connected to charge the large capacitor.

[0076] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. An intelligent photographing device for license plate detection, characterized in that: It includes a camera housing, an image capturing device arranged in the camera housing, and a power-on device arranged in the camera and used for controlling the circuit connection of the image capturing device; The power supply device includes a power supply socket fixedly connected to the camera housing and connectable to an external power supply, a power connection structure detachably connected to the power supply socket and used to supply power to the image capture device, and a plug-in structure used to control the on and off of the power connection structure; The plug-in and pull-out structure comprises a driven platform for fixing the power plug, a spring return and tightening structure for actively pressing against the driven platform so that the power plug can be connected to the power socket, and a pulling out structure for actively pulling out the power plug; A slide groove is opened in the camera housing, and a section of the bottom of the driven platform is installed in the slide groove. On the driven platform, a plug fixing groove is integrally formed, and the power plug is fixedly installed on the driven platform through the plug fixing groove and screws. The spring reset and tightening structure includes a fixed base installed at the right end of the slide groove through screws, a guide column integrally formed on the inner side of the fixed base, and a reset spring sleeved on the outer side of the guide column. The right end of the reset spring is fixedly connected to the inner side of the fixed base, and the left end of the reset spring is fixedly connected to the right end face of the driven platform; The pull-out structure comprises a driving motor, a belt transmission mechanism driven by the output shaft of the driving motor, a driven slide rod slidably connected to the driven platform, and a toggle structure provided on the belt transmission mechanism and used to toggle the driven slide rod away from the power supply socket; The cam is secured to the base by the spring which is secured on the base with the spring having a cam portion secured thereto and having a cam portion secured thereto which is rotatable therefrom and which can be used to cam the cam portion out of the way of the cam portion. The plug-in structure also includes a light indicator structure for monitoring the position status of the power plug; The light indication structure includes a fault state display structure and a normal state display structure, and also includes an external power supply circuit arranged in the camera housing and used to supply power to the fault state display structure and the normal state display structure, wherein a large capacitor is arranged in the external power supply circuit to supply power to the drive motor after the power plug is unplugged; The image shooting device includes an image acquisition module, a license plate positioning module, a license plate recognition module and a result display module; The image acquisition module is used to collect the real-time video stream of the vehicle and transmit the video stream to the license plate positioning module; The license plate positioning module uses a deep learning algorithm to locate the license plate area of ​​each frame image in the video stream and transmits the positioning result to the license plate recognition module; The license plate recognition module recognizes the license plate number based on the positioning result and transmits the recognition result to the result display module; The result display module displays the recognition results on the display screen and can update the display content in real time; It also includes the following steps: Step S01: insert the power socket into an external power socket so that the power plug is connected to the power wire; Step S02: starting the power supply device to turn on the power of the image capture device; Step S03: by controlling the plug-in structure, the power connection structure is connected to the power supply socket, and the image capture device starts to work; Step S04: within a set time period, the image capture device automatically performs license plate detection; Step S05: Displaying the license plate detection result in real time through the result display module; Step S06: During the working process, when it is found that the image capture device has no display or the display is blurred, the output shaft of the drive motor is controlled to reverse by controlling the plug-in structure, and the belt reversal drives the lever to reverse synchronously. The lever will abut the left side of the driven slide bar and push it to the right against the plate, and the power plug is pulled out of the power socket, so that the power connection structure is separated from the power socket, and the power supply of the image capture device is disconnected. The lever continues to move to the right until the main inclined surface of the driven slide bar abuts against the secondary inclined surface, and the secondary inclined surface converts the rightward sliding into a sliding along the secondary inclined surface, and then the driven slide bar is pushed out to the side away from the drive motor until the lever is separated from the driven slide bar. When the lever is separated from the driven slide bar, the return spring will realize the rebound of the driven table, and the return spring will re-insert the power plug into the power socket to realize mechanical automatic restart, so that the power connection structure is connected to the power socket, and the image capture device starts to work, and the push-out spring will reset the driven slide bar again and make it reach a position that can be moved by the lever.

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