Number plate endorsement equipment with verification device

Abstract

The utility model provides number plate endorsement equipment with a verification device, which comprises an endorsement device and a verification device, and is characterized in that the endorsement device comprises a support, the top of the support is provided with a laser emitting device used for emitting laser beams, and the endorsement device endorses an endorsement graph in a to-be-endorsed area of a number plate through the laser beams; the verification device is located on a support of the endorsement device, the verification device is located at any position in the number plate conveying direction after endorsement is completed, the height of the verification device is located between the endorsement device and the number plate, the verification device comprises at least two cameras located at different positions, and the different cameras face the to-be-endorsed area; and the verification device is used for identifying the endorsement graph. According to the utility model, the verification device is additionally arranged, the endorsement effect of the number plate endorsement device is rapidly judged by comparing a plurality of images, the automation degree is high, the endorsement efficiency of number plate endorsement and the quality of a final product are improved, and the anti-counterfeiting safety effect is enhanced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to license plate signing equipment, more particularly to a license plate signing equipment with a checking device for motor vehicle license plate sequence identification. BACKGROUND

[0002] The existing motor vehicle license plate adopts various anti-counterfeiting technologies, including two-dimensional codes, special characters, serial numbers, etc. Among them, special characters need to be formed by using a special dynamic laser signing device. When an observer observes the special characters, a dynamic space image with floating and sinking visual effects can be seen. After the existing signing device signs, it will take a photo of the special characters on the license plate surface through a camera and other detection devices for identification. The camera captures the special characters, serial numbers, and two-dimensional codes on the license plate surface and uploads them to the control system, which judges whether the patterns are correct. Since the detection device uses a single camera, it cannot compare the position and shape of the special characters at different angles. It can only be identified by manual post-processing, which is not conducive to quickly detecting the signing of special characters and real-time monitoring of the signing quality of license plates, cannot guarantee the anti-counterfeiting effect, and is not conducive to the management department to identify and manage motor vehicle license plates. SUMMARY

[0003] The utility model aims at providing a license plate signing device with a checking device that can better verify dynamic space images.

[0004] According to one aspect of the utility model, a license plate signing device with a checking device is provided, which includes:

[0005] The signing device includes a bracket, a laser emitting device is installed at the top of the bracket for emitting a laser beam, and the signing device signs a signing pattern in the signing area of the license plate through the laser beam.

[0006] The checking device is located on the bracket of the signing device or at any position along the conveying direction of the license plate after signing, and the height of the checking device is between the signing device and the license plate. The checking device includes at least two cameras located at different positions, and the different cameras are respectively directed to the signing area. The checking device is used to identify the signing pattern.

[0007] In some embodiments, the checking device includes two cameras located at a first position and a second position, respectively. The distance between the first position and the second position and the signing device is the same. The extension lines of the cameras at the first position and the second position intersect the license plate at the same point as the intersection of the laser beam and the license plate.

[0008] In some embodiments, the angle between the extension lines of the cameras at the first position and the second position and the laser beam is θ, and 3°≤θ≤15°.

[0009] In some embodiments, the signature graphic is a special character, the special character has a dynamic visual effect of floating up and sinking down, and the special character is a two-digit number.

[0010] In some embodiments, the camera at the first position and the camera at the second position obtain a first image and a second image respectively, the positions of each number on the first image and the second image are different, and each number has a highest floating-up position and a lowest sinking-down position respectively.

[0011] In some embodiments, the offset between the highest floating-up position and the lowest sinking-down position is 0.5mm-5mm.

[0012] In some embodiments, the laser emitting device includes a fiber laser for providing a laser beam and a galvanometer and field lens assembly for forming the signature graphic.

[0013] In some embodiments, the signature device further comprises:

[0014] A workbench for placing and conveying the license plate, the support is mounted on the workbench, and the signature device is single-station or double-station;

[0015] A control system for controlling the signature device to sign and the verification device to collect images and compare the collected images.

[0016] In some embodiments, when the signature device is single-station, a moving platform is fixed in the middle of the support, the moving platform is connected with a diffusion sheet and drives the diffusion sheet to move up and down along the vertical direction, an imaging lens is fixed below the diffusion sheet, and the diffusion sheet and the imaging lens are movably arranged.

[0017] In some embodiments, when the signature device is double-station, the signature device is divided into a first signature device and a second signature device;

[0018] The moving platform of the first signature device is connected with a diffusion sheet and drives the diffusion sheet to move up and down along the vertical direction, an imaging lens is fixed below the diffusion sheet, and the laser beam is converged by the imaging lens after the diffusion angle is increased by the diffusion sheet, so that the first identification information is signed on the license plate by the imaging lens;

[0019] The second signature device signs the second identification information on the license plate after scanning the graphic track by the laser beam.

[0020] The first identification information includes a special character, and the second identification information includes a two-dimensional code and a serial number.

[0021] The beneficial effects are:

[0022] The number plate signing device has the advantages that the checking device is arranged, a multi-view camera is used to recognize the dynamic space image with the floating and sinking effect obtained through signing, the signing effect of the number plate signing device is quickly judged through comparison of multiple images, the degree of automation is high, the signing efficiency of the number plate signing and the quality of the final product are improved, and the anti-fake safety effect of the surface mark of the number plate is enhanced. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 is a structural schematic view of a number plate signing equipment with a checking device in embodiment one;

[0024] Figure 2 is an enlarged view of the checking device in embodiment one;

[0025] Figure 3 is a schematic view of the working principle of the checking device in embodiment one;

[0026] Figure 4 a, 4b is an image collected by the checking device in embodiment one;

[0027] Figure 5 is a structural schematic view of a number plate signing equipment with a checking device in embodiment two;

[0028] Wherein, 11 is a first signing device, 111 is a first support, 112 is a first laser emitting device, 12 is a second signing device, 121 is a second support, 122 is a second laser emitting device, 13 is a moving platform, 14 is a diffusion sheet, 15 is an imaging lens, 16 is a workbench, 2 is a checking device, 21 is a first camera, 22 is a second camera, 3 is a number plate, 31 is a to-be-signed area, 32 is a special character, 4 is an illuminating device. DETAILED DESCRIPTION

[0029] Embodiment one

[0030] Figures 1-4 The number plate signing equipment with a checking device is schematically shown. Figure 1 As shown in the figure, the number plate signing device is a double-station signing device, which comprises a first signing device 11 located at a first signing station and a second signing device 12 located at a second signing station, and the first signing device 11 and the second signing device 12 are located on the surface of a workbench 16.

[0031] The first signing device 11 comprises a first support 111, a first laser emitting device 112, a moving platform 13, a diffusion sheet 14 and an imaging lens 15. The first laser emitting device 112 is mounted on the top of the first support 111 and comprises a fiber laser and a galvanometer and field lens assembly (not shown) at the output end of the fiber laser. The moving platform 13 is arranged in the middle of the first support 111 and is connected with the diffusion sheet 14 and the imaging lens 15. The moving platform 13 can move up and down in the vertical direction to adjust the height of the diffusion sheet 14 and the imaging lens 15 in the vertical direction. The diffusion sheet 14 can be arranged in a single piece or multiple pieces. In this embodiment, the diffusion sheet 14 is arranged in two pieces with different heights. The diffusion sheet 14 can be any one of optical devices with diffusion effect such as frosted optical glass, optical grating, microlens array or cylindrical lens array. In this embodiment, the frosted optical glass is preferred.

[0032] In this embodiment, the special character is formed by using integrated imaging technology. Integrated imaging is an automatic stereoscopic and multi-view three-dimensional imaging technology. A laser beam is converged in front of or behind a microlens array by using a lens with a large numerical aperture. The convergence point is collected on the laser recording material under the microlens array. The relative position between the focusing point of the laser beam and the microlens array is changed to form a pattern. Finally, a special visual effect of three-dimensional dynamic space imaging is formed.

[0033] The laser beam is emitted from the first laser emitting device 112, passes through the diffusion sheet 14, and is imaged by the imaging lens 15. As a result of the scattering effect of the diffusion sheet 14 on the laser beam, the light diffusion angle is increased, the numerical aperture is increased, the field view angle is further increased, and the first identification information is signed on the surface of the license plate located at the first signing position. The first identification information is located at the upper left corner of the license plate.

[0034] In this embodiment, the first identification information signed by the first signing device 11 is a two-digit number and has a floating and sinking effect, respectively. Specifically, when the observation view angle is moved, the position of the special character is observed to move. When the license plate is rotated upward along the long axis, the first digit position is floated and the last digit position is sunk. When the license plate is rotated downward, the first digit position is sunk and the last digit position is floated.

[0035] In addition, the lighting device 3 is arranged in front of the first signing device 11 and provides light for the first signing device 11 to sign the license plate. Specifically, the lighting device 3 comprises a plurality of surface light sources with different directions. The surface light source is used instead of the traditional point light source as the supplementary light source for shooting the license plate. As a result, the light can be more evenly distributed on the license plate when shooting, and a high-quality image can be obtained.

[0036] The second signing device 12 comprises a second support 121 and a second laser emitting device 122. The second laser emitting device 122 is installed on the top of the second support 121 and comprises a fiber laser and a galvanometer and field lens assembly (not shown) at the output end of the fiber laser. The laser beam is emitted by the second laser emitting device 122 to sign the second identification information on the surface of the license plate at the second signing station. The second identification information is a two-dimensional code and a serial number, and is also located at the upper left corner of the license plate. Under the driving of the control system, the license plate is conveyed from the first signing station to the second signing station, and the signing work is completed by the first signing device 11 and the second signing device 12.

[0037] As shown in Figure 2 The verification device 2 is installed on the second support 121 of the second signing device 12 and is located between the second laser emitting device 122 and the license plate at the second signing station. The verification device 2 comprises at least two cameras at different positions, which are used to identify the special characters. Specifically, the number of cameras can be two, three, four or more, which is not limited. In this embodiment, the number of cameras is two, which are a first camera 21 at a first position and a second camera 22 at a second position, both of which are fixed to the second support 121 by connecting members. The first camera 21 and the second camera 22 are located on one side of the second laser emitting device 122 in the second signing device 12 and have the same distance from the second laser emitting device 122. The two cameras are oppositely inclined and both face the to-be-signed area 31 at the upper left corner of the license plate 3, simulating different observation angles. Figure 3 In this embodiment, the intersection of the extension line of the first camera 21 and the second camera 22 in the inclined direction and the license plate is the same as the intersection of the laser beam and the license plate, and the included angle between the extension line and the laser beam is θ, 3°≤θ≤15°, and in this embodiment, θ=8°. The included angle θ is adjusted according to the position of the special character and the size of the offset, so that the positional relationship between the two cameras and the special character can ensure that the first camera 21 and the second camera 22 can capture the image of the special character, and at the same time, the special character is accurately focused, improving the clarity and accuracy of camera recognition.

[0038] Referring to Figure 4 a、 Figure 4 b, Figure 4 a is the image captured by the first camera 21, Figure 4Image b is the image captured by the second camera 22. From left to right, the image contains a QR code, special characters, and a serial number. In this embodiment, the first camera 21 and the second camera 22 are Hikvision industrial cameras MV-CS200-10UC, with a lens f=8mm and a working distance of 320mm. In the image captured by the first camera 21, the special character is the number "34", with the number "3" higher than the number "4". In the image captured by the second camera 22, the number "3" is lower than the number "4". Therefore, it can be determined that when the viewing angle changes from the first camera 21 to the second camera 22, the observed number shifts, with the number "3" gradually sinking and the number "4" gradually rising. The displacement is 0.5mm-5mm, specifically referring to the distance the top of the observed number moves before and after the displacement. In this embodiment, the displacement is 1mm. The first camera 21 and the second camera 22 upload the captured images to the control system, which quickly determines the annotation effect of the special characters by comparing the images. Furthermore, a range of special character offsets under standard conditions can be set. If the identified offset exceeds a preset value, the license plate with the endorsement is considered defective and is scrapped; if the identified offset meets the preset value, the license plate with the endorsement has a good special character endorsement effect. In this embodiment, the verification of special characters occurs after two endorsements. The verification device 2 can not only identify special characters but also simultaneously identify surrounding QR codes and serial numbers, quickly and accurately judging the endorsement effect of the license plate endorsement device. This high degree of automation improves the endorsement efficiency of license plates and the quality of the final product, enhancing the anti-counterfeiting security effect of the license plate surface markings.

[0039] Example 2

[0040] like Figure 5 As shown, the license plate endorsement device in this embodiment is also a dual-station endorsement device, with the same structure as other devices in Embodiment 1, except that the verification of special characters occurs after the initial endorsement. Specifically, in this embodiment, the verification device 2 is mounted on the first bracket 111 of the first endorsement device 11. After the special characters are endorsed on the license plate surface at the first endorsement station, the first camera 21 and the second camera 22 capture images of the license plate surface and perform recognition. Since the license plate surface only has the first identification information endorsed at this time, the captured images only contain special characters, which is beneficial for clearer and more convenient recognition of the endorsement effect, and also has stronger tolerance for the resolution of the cameras in the verification device.

[0041] In addition to the positions of the detection device in Embodiments 1 and 2, the detection device can also be set above any position along the license plate conveying direction after the special character annotation is completed by other fixing devices, as long as the image of the special character can be clearly and accurately captured.

[0042] Example 3

[0043] The license plate signing device is a single-station signing device with a unique signing device. The signing device comprises a support, a laser emitting device, a moving platform, a diffusion sheet and an imaging lens. The laser emitting device is installed on the top of the support and comprises a fiber laser and a galvanometer and field lens assembly at the output end of the fiber laser. The moving platform is arranged in the middle of the support and is connected to the diffusion sheet and the imaging lens. The moving platform can move up and down in the vertical direction to adjust the height of the diffusion sheet and the imaging lens in the vertical direction. The diffusion sheet and the imaging lens are also movably arranged. When signing the first identification information, the diffusion sheet and the imaging lens are located below the laser emitting device. The laser beam is emitted from the laser emitting device, passes through the diffusion sheet, and the diffusion sheet is located at the focal plane of the laser beam. Due to the scattering effect of the diffusion sheet on the laser beam, the light diffusion angle increases. Then the imaging lens images, thereby increasing the numerical aperture and further increasing the field of view. The license plate surface at the first signing station is signed. When signing the second identification information, the diffusion sheet and the imaging lens are moved away. The laser beam does not pass through the diffusion sheet and the imaging lens. The laser beam is emitted from the laser emitting device to sign the license plate surface. Under the driving of the control system, the license plate completes the signing of the first identification information and the second identification information at the same station.

[0044] In addition, the signing device also has an illumination device located in front of the signing device. The illumination device provides light for the signing device to sign the license plate. Specifically, the illumination device comprises a plurality of surface light sources facing different directions. The surface light source is used instead of the traditional point light source as the supplementary light source when the license plate is photographed. The light can fall more evenly on the license plate when it is photographed, and a high-quality image can be obtained.

[0045] The verification device is installed on the support of the signing device and is located between the laser emitting device and the license plate. The verification device comprises at least two cameras with different positions and is used to identify special characters. Specifically, the number of cameras can be two, three, four or more, which is not limited. In this embodiment, the number of cameras is two, which are a first camera at a first position and a second camera at a second position, both of which are fixed to the support through a connecting piece. The first camera and the second camera are located on one side of the laser emitting device in the signing device and have the same distance from the laser emitting device. The two cameras are arranged in opposite directions and both face the signing area at the upper left corner of the license plate, simulating different observation angles. The intersection of the extension line of the first camera and the second camera in the inclined direction and the license plate is the same as the intersection of the laser beam and the license plate, and the included angle between the extension line and the laser beam is θ, 3°≤θ≤15°, and in this embodiment, θ=10°. The positional relationship between the two cameras and the special characters can ensure that the first camera and the second camera can capture the image of the special characters and accurately focus on the special characters, thereby improving the clarity and accuracy of camera recognition and quickly and accurately judging the signing effect of the license plate signing device.

[0046] The above merely describes some embodiments of the present application. For those skilled in the art, without departing from the inventive concept, several modifications and improvements can be made, which are all within the protection scope of the present application.

Claims

1. A number plate signing apparatus having a checking device, characterized in that, The application relates to a license plate signing device. The signing device comprises a support, a laser emitting device arranged on the top of the support for emitting a laser beam, and a signing device for signing a signing pattern in a signing area of the license plate by the laser beam. The verification device is arranged on the support of the signing device or at any position along the conveying direction of the license plate after signing, and the height of the verification device is between the signing device and the license plate, and the verification device comprises at least two cameras arranged at different positions and facing the signing area, and the verification device is used for identifying the signing pattern.

2. A number plate signing apparatus with a checking device according to claim 1, characterized in that, The two cameras are arranged at a first position and a second position respectively, the distance between the first position and the second position and the signing device is the same, and the intersection of the extension lines of the cameras at the first position and the second position and the license plate is the same as the intersection of the laser beam and the license plate.

3. A number plate signing apparatus with a checking device according to claim 2, characterized in that, The included angle between the extension lines of the cameras at the first position and the second position and the laser beam is theta, and 3 DEG <= theta <= 15 DEG.

4. A number plate signing apparatus with a checking device according to claim 2, characterized in that, The signing pattern is a special character, the special character has a dynamic visual effect of floating up and sinking down, and the special character is a two-digit number.

5. A number plate signing apparatus with a checking device according to claim 4, characterized in that, The cameras at the first position and the second position obtain a first image and a second image respectively, the positions of each digit in the first image and the second image are different, and each digit has a highest floating position and a lowest sinking position.

6. A number plate signing apparatus with a checking device according to claim 5, characterized in that, The offset between the highest floating position and the lowest sinking position is 0.5 mm-5 mm.

7. A license plate signing apparatus having a checking device according to claim 1, characterized in that, The laser emitting device comprises a fiber laser for providing the laser beam and a galvanometer and field lens assembly for forming the signing pattern.

8. A license plate signing apparatus with a checking device according to claim 1, characterized in that, The signing device further comprises: A workbench for placing and conveying the license plate, the support is arranged on the workbench, and the signing device is arranged in a single work station or a double work station; A control system for controlling the signing of the signing device and the image acquisition of the verification device and comparing the collected images.

9. A number plate signing apparatus with checking means according to claim 8, characterized in that, When the signing device is arranged in a single work station, a moving platform is fixed in the middle of the support, the moving platform is connected with a diffusion sheet and drives the diffusion sheet to move up and down along the vertical direction, an imaging lens is fixed below the diffusion sheet, and the diffusion sheet and the imaging lens are movably arranged.

10. A number plate signing apparatus with a checking device according to claim 8, characterized in that, When the signing device is arranged in a double work station, the signing device is divided into a first signing device and a second signing device. A moving platform is fixed in the middle of the support of the first signing device, the moving platform is connected with a diffusion sheet and drives the diffusion sheet to move up and down along the vertical direction, an imaging lens is fixed below the diffusion sheet, the laser beam is converged by the imaging lens after passing through the diffusion sheet and increasing the diffusion angle, and the first identification information is signed on the license plate by the imaging lens; The second signing device signs the second identification information on the license plate after scanning the pattern track of the laser beam. The first identification information comprises a special character, and the second identification information comprises a two-dimensional code and a serial number.

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