License plate input identification equipment

Abstract

The utility model provides license plate input identification equipment, which comprises a case, an embedded industrial personal computer, a light source assembly and a camera assembly, wherein the case comprises a bottom plate and a top plate which are oppositely arranged, a panel and a back plate which are oppositely arranged, and a first side plate and a second side plate which are oppositely arranged, the panel is provided with a placing window for placing and taking a number plate, and the bottom plate is provided with a placing table for placing the number plate; the camera shooting assembly is arranged on the inner side of the top plate, the light source assembly comprises area light sources which are arranged on the inner side surfaces of the top plate, the panel, the back plate, the first side plate and the second side plate and used for providing light supplement for the camera shooting assembly, and the embedded industrial personal computer is arranged outside the case and is in communication connection with the camera shooting assembly. According to the license plate input recognition equipment, a traditional point light source is replaced with the area light source, illumination on the surface of a license plate is uniform, a high-quality image is obtained, meanwhile, the correlation sensor is adopted for detecting whether foreign matter exists on the placement table or not, it can be guaranteed that the information content of the obtained image is complete, and input and later analysis of license plate information are facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of information input, in particular to an input device for license plate information recognition. Background Art

[0002] A license plate input device is a device for photographing and inputting information of license plates. The license plate input devices in the prior art generally include a control system, a camera system, and a light source system. Its working principle is as follows: The license plate is placed in a specific recognition area, the camera system photographs the license plate, the light source system provides supplementary light for the camera system, the control system is connected to the camera system, obtains the image information obtained by the camera system, analyzes and inputs it, and finally sends the input information to the database for storage.

[0003] However, in most of the existing license plate input devices at present, the light source system for supplementary light is mostly a point light source. Since the light of the point light source diverges in different directions, when collecting the pattern on the license plate surface through photographing, the illumination on the license plate surface is uneven, which affects the image quality and is not conducive to information input and subsequent information analysis. In addition, most of the prior art lacks technical means for identifying foreign objects in the license plate placement area. When placing the license plate, there may be a situation where the license plate is blocked by foreign objects and cannot be recognized. In this way, when there are foreign objects on the license plate placement table, the integrity of the information content of the image cannot be guaranteed, which affects the input of license plate information and the subsequent analysis of license plate information. In addition, some existing input devices are provided with a transmission device, which has the problem of too large equipment volume and is not suitable for being placed at the license plate issuing place with a small floor area. Summary of the Utility Model

[0004] In view of this, the purpose of the present utility model is to provide an input device for license plates, which can ensure the quality of the collected image and the integrity of the information, and at the same time can reduce the floor area of the device and is convenient for placement.

[0005] The utility model adopts the following technical solutions. The utility model provides a license plate input and recognition device, including: a chassis, including a bottom plate and a top plate arranged oppositely, a front panel and a rear panel arranged oppositely, and a first side plate and a second side plate arranged oppositely, wherein the front panel, the rear panel, the first side plate and the second side plate are all connected between the top plate and the bottom plate, the first side plate and the second side plate are both connected between the front panel and the rear panel, the front panel is provided with a placement window for putting in and taking out license plates, and the chassis further includes a placement table arranged on the bottom plate for placing license plates to be input; a camera assembly, arranged on the inner side of the top plate, for photographing the license plates placed on the placement table to obtain input images corresponding to the license plates; a light source assembly, including a plurality of surface light sources respectively arranged on the inner surfaces of the top plate, the front panel, the rear panel, the first side plate and the second side plate for providing supplementary light for the camera assembly; an embedded industrial computer, arranged outside the chassis and communicatively connected with the camera assembly, for analyzing the input images to generate input data corresponding to the license plates.

[0006] Further, the chassis further includes four support columns and a top frame. The four support columns are respectively connected at the junctions of the front panel and the first side plate, the front panel and the second side plate, the rear panel and the first side plate, and the rear panel and the second side plate. The top frame is a rectangular frame body, and its four corners are respectively connected to the tops of the four support columns. The bottoms of the four support columns are provided with feet, and the height of the top frame is higher than the height of the outer side surface of the top plate.

[0007] Further, the camera assembly includes a first camera for identifying graphic codes and a second camera for identifying digital numbers.

[0008] Further, the chassis further includes a first cantilever and a second cantilever connected to one side of the top frame close to the rear panel. The length of the first cantilever is less than the length of the second cantilever. The first cantilever is connected to the first camera, and the second cantilever is connected to the second camera.

[0009] Further, the first cantilever and the second cantilever are both arranged outside the top plate of the chassis, and the first camera and the second camera are both arranged inside the top plate of the chassis.

[0010] Further, the surface light source includes a light emitting unit and a first light guiding device, or the surface light source includes a light emitting unit, a diffusion unit and a second light guiding device.

[0011] Further, the light emitting unit is arranged on the side or back of the first light guiding device or the second light guiding device.

[0012] Further, the light source assembly further includes a brightness sensor disposed on the inner wall of the chassis for detecting the luminous brightness of the light-emitting unit. Both the brightness sensor and the light-emitting unit are connected to the embedded industrial computer, and the embedded industrial computer is further configured to adjust the luminous brightness of the light-emitting unit according to the brightness signal fed back by the brightness sensor.

[0013] Further, the license plate entry and recognition device further includes a foreign object recognition unit for detecting whether there are foreign objects on the placement table. The foreign object recognition unit includes a plurality of opposed sensors respectively disposed on both sides of the license plate placement window, and the opposed sensors are connected to the embedded industrial computer.

[0014] The license plate entry and recognition device provided by the present invention uses a surface light source instead of a traditional point light source as the fill light source when photographing the license plate, and a plurality of surface light sources emitting light in different directions are provided, so that when the imaging assembly takes a photo, the light can fall on the license plate more evenly, obtaining high-quality images. At the same time, an opposed sensor is additionally provided to detect whether there are hands or other foreign objects entering the placement table, and the photo is taken after the foreign object leaves, which can ensure the integrity of the information content of the obtained image, facilitate the entry of license plate information and the analysis of the license plate information in the later stage, thereby avoiding the problems of low image quality and difficult license plate recognition; in addition, the license plate entry and recognition device provided by the present invention occupies a small area and has low requirements for the use scenario, and is convenient to be placed at the license plate issuing place. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 Schematic diagram of the entry device provided for a preferred embodiment of the present invention.

[0017] Figure 2 For Figure 1 Front view of the entry device shown.

[0018] Figure 3 For Figure 1 Side view of the entry device shown.

[0019] Figure 4 For Figure 1 Top view of the entry device shown.

[0020] Figure 5 (a), 5(b) are Figure 1 Schematic diagram of the structure of the surface light source in the entry device shown.

[0021] In the figure: chassis 1; top frame 11; struts 12; panel 13; back panel 14; bottom plate 15; top plate 16; first side plate 17; second side plate 18; first cantilever 111; second cantilever 112; embedded industrial computer 2; license plate placement table 151; placement slot 152; license plate placement window 131; surface light source 4; light emitting unit 41; first light guiding device 42; diffusion unit 43; second light guiding device 44; first camera 51; second camera 52; opposed sensor 53. Specific embodiments

[0022] Next, specific embodiments of the present utility model will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the description of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present utility model.

[0023] As Figures 1 to 4 shown, the first preferred embodiment of the present utility model provides a license plate entry and recognition device, including a chassis 1, an embedded industrial computer 2, a light source assembly, and a camera assembly. The chassis 1 includes a bottom plate 15 and a top plate 16 disposed opposite to each other, a panel 13 and a back panel 14 disposed opposite to each other, and a first side plate 17 and a second side plate 18 disposed opposite to each other. The panel 13, the back panel 14, the first side plate 17, and the second side plate 18 are all connected between the bottom plate 15 and the top plate 16, and the first side plate 17 and the second side plate 18 are both connected between the panel 13 and the back panel 14. The panel 13 is provided with a placement window 131 for putting in and taking out license plates, and the chassis 1 further includes a placement table 151 disposed on the bottom plate 15 for placing license plates to be entered.

[0024] The camera assembly is disposed inside the top plate 16 and is used to photograph the license plate placed on the placement table 151 to obtain an entry image corresponding to the license plate. The light source assembly includes surface light sources respectively disposed on the inner surfaces of the top plate 16, the panel 13, the back panel 14, the first side plate 17, and the second side plate 18 for providing supplementary light for the camera assembly. The embedded industrial computer 2 is disposed outside the chassis 1 and is communicatively connected to the camera assembly for analyzing the entry image to generate entry data corresponding to the license plate.

[0025] As Figure 1 shown, the chassis 1 further includes four struts 12 and a top frame 11. The four struts 12 are respectively connected at the junctions of the panel 13 and the first side plate 17, the panel 13 and the second side plate 18, the back panel 14 and the first side plate 17, and the back panel 14 and the second side plate 18. The top frame 11 is a rectangular frame, and its four corners are respectively connected to the tops of the four struts 12. The bottoms of the four struts 12 are provided with feet, and the height of the top frame 11 is higher than the height of the outer surface of the top plate 16.

[0026] The chassis bottom plate 15 is provided with a placement table 151 for placing the license plate to be input. The license plate placement table 151 is formed with a placement groove 152 for defining the placement position of the license plate. The staff can place the license plate in a specific recognition area for recognition. The placement groove 152 is arranged directly below the camera assembly to ensure that the license plate can be completely and clearly input.

[0027] As Figure 2 shown, the license plate input and recognition device further includes a foreign object recognition unit. The foreign object recognition unit includes a plurality of opposed sensors 53. The opposed sensors 53 are arranged on both sides of the license plate placement window 131. When a hand or other foreign object enters the license plate placement window 131, the opposed sensors 53 on both sides do not respond, and no signal is transmitted to the embedded industrial computer 2, and the camera does not start. When the foreign object leaves the placement window 131, the opposed sensors 53 respond and feedback the signal to the embedded industrial computer 2. The embedded industrial computer 2 then commands the camera assembly to start working, thereby ensuring the integrity of the information content of the acquired image and being conducive to the input of license plate information and the identification of license plate information in the later stage.

[0028] As Figure 4 shown, the camera assembly includes a first camera 51 for recognizing digital numbers and a second camera 52 for recognizing image codes. The acquisition range of the first camera 51 is the two-dimensional code area of the license plate, and the acquisition range of the second camera 52 is the entire license plate recognition area. The first camera 51 and the second camera 52 are communicatively connected to the embedded industrial computer 2, and transmit the acquired two-dimensional code and number information to the embedded industrial computer 2 for input and analysis.

[0029] The top frame 11 is provided with a first cantilever 111 and a second cantilever 112 parallel to the top plate 16 on the side close to the back plate 14. The length of the first cantilever 111 is less than the length of the second cantilever 112. The first cantilever 111 is connected to the first camera 51, and the second cantilever 112 is connected to the second camera 52. The camera extends through the top plate 16 into the chassis 1 and is perpendicular to the license plate placement table 151 to ensure that the acquisition range can cover the entire recognition area.

[0030] As Figure 5 (a) to Figure 5 (b) shown, the light source assembly includes a surface light source 4. The surface light source 4 includes a light emitting unit 41 and a first light guiding device 42, or the surface light source 4 includes a light emitting unit 41, a diffusion unit 43, and a second light guiding device 44. Among them, when the surface light source 4 includes a light emitting unit 41 and a first light guiding device 42 (i.e., Figure 5(as shown in (a)), the light-emitting unit 41 is disposed on the back surface of the first light guide device 42. Of course, the light-emitting unit 41 can also be disposed on the side surface of the first light guide device 42; when the surface light source 4 includes the light-emitting unit 41, the diffusion unit 43, and the second light guide device 44 (i.e., Figure 5 (as shown in (b)), the light-emitting unit 41 is located on the back surface of the second light guide device 44, and the light-emitting unit 41 and the second light guide device 44 are respectively disposed on opposite sides of the diffusion unit 43. Of course, the light-emitting unit 41 can also be located on the side surface of the second light guide device 44. At this time, the diffusion unit 43 is also located between the light-emitting unit 41 and the second light guide device 44. In this embodiment, the number of the surface light sources 4 is multiple, and they are respectively disposed on the inner surfaces of the top plate 16, the panel 13, the back plate 14, the first side plate 17, and the second side plate 18; when the license plate is recognized, the multiple surface light sources 4 can respectively provide sufficient and uniform light for the camera from different directions to obtain a clearer image, which is convenient for later analysis and entry.

[0031] The light source assembly further includes a brightness sensor disposed on the inner wall of the chassis for detecting the luminous brightness of the light-emitting unit 41. The brightness sensors can be multiple, and specifically, they can be disposed in multiple areas of the license plate placement table without affecting the placement of the license plate. Both the brightness sensor and the light-emitting unit 41 are connected to the embedded industrial computer 2. The brightness sensor feeds back the brightness signal to the embedded industrial computer 2, and the embedded industrial computer 2 then adjusts the luminous brightness of each surface light-emitting unit 41 according to the feedback, finally realizing the uniform brightness of the surface of the license plate placement table.

[0032] The embedded industrial computer 2 is connected to the database. After the embedded industrial computer 2 obtains the image information collected by the first camera 51 and the second camera 52, it analyzes to generate the entry data corresponding to the license plate and transmits it to the database for storage.

[0033] When the license plate entry and recognition device of the present utility model works, the staff puts the license plate into the placement slot 152 of the chassis bottom plate 15 through the placement window 131. At this time, if the through-beam sensor 53 detects a foreign object such as a hand, no signal is transmitted to the embedded industrial computer 2, and the camera does not start; after the foreign object such as a hand leaves the placement window 131, the through-beam sensor 53 detects no foreign object, the embedded industrial computer 2 receives the feedback signal of the through-beam sensor 53 and controls the first camera 51 and the second camera 52 to take pictures. At the same time, the brightness sensor senses the light condition and feeds it back to the embedded industrial computer 2, and the embedded industrial computer 2 controls the light-emitting unit 41 to adjust the brightness to a proper state, so as to obtain a clear and complete license plate picture. The camera quickly collects the license plate information, which is analyzed and entered by the embedded industrial computer 2, and the above information is uploaded to the database management system. After taking out the license plate, the next license plate will be quickly recognized and entered as described above.

[0034] In summary, the license plate entry and recognition device provided by the present utility model uses a surface light source 4 instead of a traditional point light source as the supplementary light source when photographing the license plate, and multiple surface light sources emitting light in different directions are provided, so that when the camera component takes a picture, the light can fall on the license plate more evenly, obtaining a higher quality image; at the same time, the present utility model additionally provides a technical means for foreign object recognition in the area of the license plate placement table 151, namely an opposed sensor 53. When it is detected that a hand or other foreign objects enter the placement window 131, the camera does not start, and the photographing is performed after the foreign objects leave, ensuring that an accurate image can be obtained, which is beneficial to the subsequent entry and analysis of the picture, thus avoiding the problems of low image quality and great difficulty in license plate recognition. In addition, the license plate entry and recognition device provided by the present utility model occupies a small area and has low requirements for the use scenario, and is suitable for being placed at a license plate issuing place with a small area.

[0035] The above is only the specific implementation manner of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present utility model should be covered within the protection scope of the present utility model.

Claims

1. A license plate entry and recognition device, characterized in that, Including: A chassis, including a bottom plate and a top plate arranged oppositely, a front panel and a rear panel arranged oppositely, and a first side plate and a second side plate arranged oppositely. The front panel, the rear panel, the first side plate and the second side plate are all connected between the top plate and the bottom plate. The first side plate and the second side plate are both connected between the front panel and the rear panel. The front panel is provided with a placement window for putting in and taking out number plates. The chassis further includes a placement table arranged on the bottom plate for placing the number plates to be input; A camera assembly, arranged inside the top plate, for photographing the number plates placed on the placement table to obtain input images corresponding to the number plates; A light source assembly, including a plurality of surface light sources respectively arranged on the inner surfaces of the top plate, the front panel, the rear panel, the first side plate and the second side plate for providing supplementary light for the camera assembly; An embedded industrial computer, arranged outside the chassis and communicatively connected with the camera assembly, for analyzing the input images to generate input data corresponding to the number plates.

2. The license plate entry and recognition device according to claim 1, wherein The chassis further includes four support columns and a top frame. The four support columns are respectively connected at the junctions of the front panel and the first side plate, the front panel and the second side plate, the rear panel and the first side plate, and the rear panel and the second side plate. The top frame is a rectangular frame body, and its four corners are respectively connected to the tops of the four support columns. The bottoms of the four support columns are provided with feet, and the height of the top frame is higher than the height of the outer surface of the top plate.

3. The license plate entry and recognition device according to claim 2, characterized in that, The camera assembly includes a first camera for identifying graphic codes and a second camera for identifying digital numbers.

4. The license plate entry and recognition device according to claim 3, characterized in that, The chassis further includes a first cantilever and a second cantilever connected to one side of the top frame close to the rear panel. The length of the first cantilever is less than the length of the second cantilever. The first cantilever is connected to the first camera, and the second cantilever is connected to the second camera.

5. The license plate entry and recognition device according to claim 4, wherein, The first cantilever and the second cantilever are both arranged outside the top plate of the chassis, and the first camera and the second camera are both arranged inside the top plate of the chassis.

6. The license plate entry and recognition device according to claim 1, characterized in that The surface light source includes a light emitting unit and a first light guiding device or the surface light source includes a light emitting unit, a diffusion unit and a second light guiding device.

7. The license plate entry and recognition device according to claim 6, characterized in that, The light emitting unit is arranged on the side or back of the first light guiding device or the second light guiding device.

8. The license plate entry and recognition device according to claim 7, characterized in that, The light source assembly further includes a brightness sensor arranged on the inner wall of the chassis for detecting the luminous brightness of the light emitting unit. The brightness sensor and the light emitting unit are both connected to the embedded industrial computer, and the embedded industrial computer is further used for adjusting the luminous brightness of the light emitting unit according to the brightness signal fed back by the brightness sensor.

9. The license plate entry and recognition device according to claim 1, characterized in that, The number plate input and recognition device further includes a foreign object recognition unit for detecting whether there are foreign objects on the placement table. The foreign object recognition unit includes a plurality of opposed sensors respectively arranged on both sides of the number plate placement window, and the opposed sensors are connected to the embedded industrial computer.

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