Ultrathin distortionless vehicle bottom scanner and vehicle bottom condition scanning method

Abstract

The invention discloses an ultrathin distortionless vehicle bottom scanner and a vehicle bottom condition scanning method, solves the problem that in the prior art, a large object distance is required when a distortionless lens is used, so that the height of scanning equipment is large, and has the beneficial effects that the object distance is prolonged in a limited space, and the image definition is ensured. According to the specific scheme, the ultrathin distortionless vehicle bottom scanner comprises a bottom shell and an upper cover, a cavity is formed in the bottom shell, a camera and a light reflecting assembly are arranged in the cavity, the camera is provided with a lens, the light reflecting assembly comprises a plurality of reflecting parts so that the object distance can be lengthened in the transverse direction of the bottom shell to limit the height of the bottom shell, and the upper cover is installed at the top of the bottom shell. The upper cover is provided with a transparent part, the transparent part is arranged above the last reflection part through which the light path of the camera passes, the light path of the camera passes through the reflection assembly and then reaches the vehicle bottom to obtain vehicle bottom image information and send the vehicle bottom image information to the computer terminal, and the computer terminal calculates the displacement of a front frame image and a rear frame image and performs vehicle bottom image splicing.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle safety detection, in particular to an ultra-thin, distortion-free vehicle bottom scanner and a vehicle bottom condition scanning method. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Motor vehicles facilitate people's daily production and life, but they also bring greater safety challenges. Some people use the complex structures of motor vehicle chassis to hide and carry dangerous goods, which has become a troubling problem worldwide. Therefore, how to conduct efficient and comprehensive safety inspections of vehicle chassis has become a top priority.

[0004] Currently, the mainstream methods for undercar inspection include undercar inspection mirrors and undercar scanners. Undercar inspection mirrors require manual inspection of each area, which is time-consuming. Their accuracy is affected by light and operator experience, and they are prone to misjudgment or omission of details. They also cannot leave traces for subsequent verification, making them less practical.

[0005] There are two main technical solutions for underbody scanners: Although the use of line scan cameras and fisheye lenses can automatically capture and archive complete images of the vehicle's underbody, image distortion can cause large visual blind spots, making it easy to miss inspections. Other solutions include products that use line scan cameras and distortion-free lenses. However, these products require a sufficient object distance, resulting in a scanner thickness greater than 50 cm. The scanner typically needs to be installed underground, requiring excavation depth greater than the scanner's thickness, making it impossible to install it in basements or on bridges. Vehicle speeds vary, and as vehicles pass through the scanner, their speeds may be uneven. Existing line scan cameras are unable to overcome the distortion caused by this uneven speed. In order to achieve shooting, the scanner must use transparent glass. The transparent glass has a wider coverage area, which makes the scanner's compressive strength lower. Summary of the Invention

[0006] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide an ultra-thin and distortion-free vehicle underbody scanner, which has a thin thickness, does not require high civil engineering excavation depth, can be placed on various types of roads, and has low overall distortion.

[0007] In order to achieve the above object, the present invention is implemented through the following technical solutions: An ultra-thin, distortion-free underbody scanner comprises a bottom shell and an upper cover. A cavity is provided inside the bottom shell, in which a camera and a reflective assembly are arranged. The camera is provided with a lens. The reflective assembly comprises a plurality of reflective elements for extending the object distance along the transverse direction of the bottom shell to limit the height of the bottom shell. The upper cover is mounted on the top of the bottom shell. The upper cover is mounted with a transparent element, which is placed above the last reflective element passed by the camera light path. The camera light path passes through the reflective assembly and reaches the bottom of the vehicle to obtain underbody image information, which is then sent to a computer terminal. The computer terminal calculates the displacement of the two frames of images and performs underbody image splicing.

[0008] The ultra-thin, distortion-free underbody scanner described above, wherein the reflective assembly includes at least three reflective elements, wherein the camera light path passes through the plurality of reflective elements so that the camera light path is directed vertically upward, wherein some reflective elements are spaced apart from the camera, and the camera is positioned close to the last reflective element through which the camera light path passes; The width of each reflector is less than or equal to 5 cm.

[0009] As described above, an ultra-thin, distortion-free underbody scanner comprises a reflective assembly including a first reflective element, a second reflective element, and a third reflective element. The first reflective element and the second reflective element are arranged opposite to each other, and the third reflective element and the second reflective element are spaced apart from each other. The third reflective element and the second reflective element are arranged opposite to each other. The camera light path passes through the first reflective element in sequence, is reflected to the second reflective element, and then reaches the third reflective element and is reflected upward.

[0010] In the ultra-thin distortion-free vehicle underbody scanner as described above, the first reflector and the second reflector are arranged at 90°, the first reflector and the second reflector are fixed to the inside of the bottom shell via a first support seat, and the third reflector is fixed to the inside of the bottom shell via a second support seat.

[0011] In the ultra-thin, distortion-free vehicle underbody scanner described above, a fill light assembly is further provided in the bottom shell, the fill light assembly includes a plurality of fill lights, and the fill lights emit light toward the transparent member; The width of the transparent part is less than or equal to 5 cm.

[0012] In the ultra-thin distortion-free vehicle underbody scanner as described above, a plurality of fill lights are provided on both sides of the camera, the fill lights are placed on the side of the last reflective component through which the camera light path passes, and the fill light assembly is placed below the transparent component.

[0013] The ultra-thin, distortion-free underbody scanner described above, wherein a dehumidifier and a circulation fan are further provided inside the bottom shell, and the fill light assembly, the circulation fan, and the dehumidifier are separately connected to a controller, and the controller is connected to the computer terminal; The circulation fan is arranged on one side of the fill light assembly, and a distance is set between the circulation fan and the reflective assembly.

[0014] The ultra-thin, distortion-free vehicle bottom scanner described above further comprises a license plate capture camera and a position sensor. The license plate capture camera is connected to the computer terminal and the controller respectively, and the position sensor is connected to the controller.

[0015] The ultra-thin, distortion-free underbody scanner as described above, wherein the upper cover is sealed to the top of the bottom shell; The upper cover surface is provided with anti-pressure parts on both sides of the transparent part, and the length of the anti-pressure parts is greater than that of the transparent part. A maintenance port is provided on the side of one of the anti-pressure parts, and a cover is provided at the maintenance port. The camera is placed below the maintenance port.

[0016] In a second aspect, the present invention further provides a method for scanning the vehicle bottom condition, using the aforementioned ultra-thin distortion-free vehicle bottom scanner, comprising the following contents: A camera and a reflective component are arranged inside the bottom shell, an upper cover is installed on the top of the bottom shell, and a transparent part is installed on the upper cover. The transparent part is placed above the last reflective part where the camera light path passes, forming an ultra-thin and distortion-free vehicle bottom scanner; The ultra-thin distortion-free vehicle bottom scanner is placed underground with the transparent parts exposed. The transparent parts are arranged along the width of the vehicle. When the vehicle passes through the ultra-thin distortion-free vehicle bottom scanner, the camera captures multiple images of the vehicle bottom through the reflective component and sends them to the computer terminal. The computer terminal calculates the sub-pixel displacement of the two frames of image based on the motion vector estimation algorithm of optical flow and performs the splicing of the vehicle bottom image.

[0017] The beneficial effects of the present invention are as follows: 1) The underbody scanner of the present invention has a rational structure. A camera and a reflective assembly are disposed within the bottom housing. The multiple reflective elements within the reflective assembly effectively extend the object distance, allowing the camera's light path to pass through the light-emitting assembly and then the transparent element of the upper cover, thereby capturing image data of the underbody. The reflective assembly utilizes the internal space of the bottom housing to extend the object distance, effectively controlling the overall height. The underbody image is acquired through the cooperation of transparent parts and reflective components, and a narrower underbody image is acquired through the cooperation of multiple reflective parts, which reduces the bandwidth occupancy and thus improves the frame rate, making the acquisition time interval very short. As a result, the displacement change between the two frames before and after when the vehicle passes is also small, which is conducive to the more accurate calculation of the sub-pixel displacement of the two frames of the image based on the optical flow motion vector estimation algorithm, and the underbody image stitching, which effectively solves the speed distortion of the vehicle chassis caused by the non-constant speed of the vehicle when passing through the underbody scanner in the traditional underbody scanning system.

[0018] 2) The present invention limits the width of the transparent part through the setting of the overall structure, effectively reducing the width of the reflector, which is conducive to achieving an ultra-thin volume as a whole. At the same time, the smaller width can reduce the bandwidth occupancy and thus increase the frame rate, reduce the difference between frames, make the spliced ​​image smoother, and improve the compressive strength of the scanner.

[0019] 3) In the present invention, anti-pressure parts are respectively provided on both sides of the transparent part to prevent the wheels from directly pressing on the transparent part and causing damage to the transparent part, and to prevent mud and water on the vehicle from sticking to the transparent part and affecting the imaging effect.

[0020] 4) The scanner of the present invention has a rational overall structure, making full use of the internal space of the bottom shell to arrange the reflective elements, ensuring that the camera optical path is not blocked and finally achieving vertical upward direction, which is conducive to achieving an overall ultra-thin volume and a long-distance effective optical path, taking into account the volume while reducing image distortion; the last reflective element through which the camera optical path passes is set close to the camera, and the fill lights are arranged on both sides of the lens, which facilitates the emitted light source to illuminate the bottom of the vehicle through the transparent element to obtain clear image information.

[0021] 5) In the present invention, the entire scanner cooperates with the license plate capture camera and position sensor. The position sensor obtains information about the passing vehicle and sends it to the controller. The controller controls the fill light to turn on, allowing the camera to obtain image information of the bottom of the vehicle. The controller also controls the license plate capture camera to obtain the license plate image and send it to the computer terminal, thus forming a complete automatic scanning system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0023] Figure 1 Schematic diagram of an ultra-thin, distortion-free vehicle underbody scanner according to one or more embodiments of the present invention.

[0024] Figure 2 FIG. 1 is a side view of an ultra-thin, distortion-free vehicle underbody scanner according to one or more embodiments of the present invention.

[0025] Figure 3 1 is a front view of an ultra-thin distortion-free vehicle bottom scanner according to one or more embodiments of the present invention.

[0026] Figure 4 1 is a top view of an ultra-thin, distortion-free vehicle underbody scanner according to one or more embodiments of the present invention.

[0027] Figure 5Schematic diagram of the interior of a base in an ultra-thin distortion-free vehicle underbody scanner according to one or more embodiments of the present invention.

[0028] Figure 6 Schematic diagram of the interior of a base in an ultra-thin distortion-free vehicle underbody scanner according to one or more embodiments of the present invention.

[0029] Figure 7 Schematic diagram of a reflective component in an ultra-thin, distortion-free vehicle underbody scanner according to one or more embodiments of the present invention.

[0030] In the figure: the distances or sizes between parts are exaggerated to show the positions of various parts, and the schematic diagram is for reference only.

[0031] Among them: 1. Upper cover, 2. Anti-pressure part, 3. Transparent part, 4. Cover plate, 5. Bottom shell, 501. Waterproof threading hole, 502. Junction box, 503. Camera, 504. Lens, 505. Camera base, 506. Fill light, 507. Fill light holder, 508. Dehumidifier, 509. Circulation fan, 510. Circulation fan holder, 511. Reflective component, 512. First support seat, 513. Sealing strip, 514. Sealing strip fixing frame, 515. First reflector, 516. Second reflector, 517. Third reflector, 518. Second support seat. DETAILED DESCRIPTION

[0032] It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those skilled in the art to which the present invention belongs.

[0033] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise clearly indicated in the present invention, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "comprising" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or their combinations; As introduced in the background technology, the existing technology requires a large object distance when using a distortion-free lens, which makes the height of the scanning equipment high and cannot be installed in some areas. In order to solve the above technical problems, the present invention proposes an ultra-thin distortion-free underbody scanner.

[0034] Example 1 In a typical embodiment of the present invention, reference is made to Figure 1 、 Figure 5 and Figure 6As shown, an ultra-thin, distortion-free underbody scanner comprises a bottom shell 5 and an upper cover 1. A cavity is provided inside the bottom shell 2, in which a camera 503 and a reflective assembly 511 are provided. The camera 503 is provided with a lens 504. The lens 504 adopts a distortion-free lens with a degree of less than 100, which greatly improves the distortion on the left and right sides of the vehicle chassis. The camera 503 adopts an industrial area array camera. The reflective assembly 511 includes multiple reflective elements to extend the object distance along the lateral direction of the bottom shell 5 to limit the height of the bottom shell 5. The upper cover 1 is mounted on the top of the bottom shell 5. The upper cover 1 is mounted with a transparent element 3. The transparent element 3 is placed above the last reflective element through which the camera light path passes. The pipeline of the camera 503 passes through the reflective assembly 511 and reaches the bottom of the vehicle to obtain underbody image information.

[0035] According to the basic principle of perspective distortion, a lens with a smaller imaging angle theoretically exhibits less perspective distortion and is more capable of restoring a realistic image of the vehicle's underbody. However, a lens with a smaller imaging angle also has a smaller field of view at the same object distance, so the object distance needs to be increased to fully cover the vehicle's underbody. To this end, a reasonable arrangement of multiple reflective elements within the reflective assembly 511 can effectively control the height of the bottom shell 5. A reasonable overall arrangement can significantly reduce the width of the reflective elements and transparent element 3, further contributing to a lower scanner height and improved overall compressive strength. Furthermore, a narrower image reduces bandwidth usage, thereby increasing the frame rate and shortening the acquisition time interval. Consequently, the displacement change between the preceding and following frames is also smaller when a vehicle passes by, facilitating the more accurate calculation of the sub-pixel displacement between the preceding and following frames using an optical flow-based motion vector estimation algorithm. This allows for the splicing of vehicle underbody images, effectively avoiding distortion caused by uneven vehicle speeds.

[0036] In this embodiment, the reflective assembly 511 includes at least three reflective elements. After the camera light path passes through multiple reflective elements, the camera light path is made vertically upward. Some of the reflective elements are set at a distance from the camera 503, and the camera 503 is set close to the last reflective element through which the camera light path passes. In this way, the space is reasonably utilized to ensure the effective length of the object distance.

[0037] refer to Figure 7As shown, the reflective assembly 511 includes a first reflector 515, a second reflector 516 and a third reflector 517. The first reflector 515 and the second reflector 516 are arranged opposite to each other and at a 90° angle therebetween. The first reflector 515 and the second reflector 516 have the same length. The top side of the first reflector 515 is tilted upward relative to the bottom of the bottom shell 5 to ensure the passage of the camera light path. The third reflector 517 and the second reflector 516 are spaced apart. The third reflector 517 and the second reflector 516 are arranged opposite to each other. The length of the third reflector 517 is greater than that of the first reflector 515. The third reflector 517 is arranged close to the camera. The top side of the third reflector 517 is lower than the lens 504 to avoid blocking the camera light path. The camera light path passes through the first reflector 515 in sequence and is reflected to the second reflector 516, and then reaches the third reflector 517 and reflects upward.

[0038] In addition, the first reflector 515 and the second reflector 516 are fixed to the inside of the bottom shell through the first support seat 512. The first support seat 512 is a bent plate with multiple bent parts. The bottom side of the first support seat 512 is fixed to the bottom inside the bottom shell 5. The first support seat 512 is a Z-shaped plate. The top side of the first support seat 512 is set higher than the center point of the camera. The first reflector 515 and the second reflector 516 can be adhered and fixed to the surface of the first support seat 512; the third reflector 517 is fixed to the inside of the bottom shell 5 through the second support seat 518. The second support seat 518 is a V-shaped plate. The bottom side of the second support seat 518 is fixed to the bottom inside the bottom shell 2. The other side of the second support seat 518 is used to fix the third reflector 517. The inclination angle of the third reflector 517 is 45 degrees, and the third reflector 517 can be adhered to the surface of the second support seat 518.

[0039] Of course, in other examples, the first reflector 515 and the second reflector 516 can also be fixed in other ways, and the angle between the first reflector and the second reflector can also be other angles, as long as the camera light path passing through the third reflector can ultimately be set upward.

[0040] Specifically, each reflective element is a reflector, which can achieve full coverage of the left and right sides of the vehicle bottom within a height of 16 cm through three reflections.

[0041] refer to Figure 6As shown, a fill light assembly is also provided in the bottom shell 5, and the fill light assembly includes multiple fill lights 506. The fill lights 506 emit light toward the transparent part 3. Because the transparent part 3 is at the upper cover 1, the fill lights 506 emit light upward. The fill lights 506 can be arranged in a row along the inner length direction of the bottom shell 5, and the adjacent fill lights can be set at a distance. The camera lens 504 is located between the two fill lights in the middle. The camera 503 is installed through the camera base 505. The camera base 505 has a set height to ensure the height of the lens, so that the height of the lens 504 is higher than the height of the third reflector.

[0042] Among them, a convex portion is set on the surface of the camera base 505, and a concave portion is set on the bottom of the camera 503. The camera and the camera base are engaged to ensure the stability of the camera. In some examples, the camera and the camera base are fixedly connected.

[0043] In addition, the fill light 506 is placed on the side of the third reflector 517, so that the fill light assembly and the third reflector 517 are both placed below the transparent part 3 to ensure that the light source illuminates the bottom of the vehicle for image acquisition; and each fill light 506 is installed through the fill light holder 507.

[0044] Taking into account the reasonable arrangement of the overall structure and the need to ensure a reasonable object distance, the first reflector 515 and the second reflector 516 are arranged close to one side of the bottom shell 5, and the third reflector 517 and the fill light group are arranged toward the other side of the bottom shell 5 relative to the center line of the length direction of the bottom shell 5. How to ensure an appropriate object distance and ensure the acquisition of image information of the bottom of the vehicle.

[0045] In addition, in order to prevent the transparent or reflective parts in the scanner from fogging, the upper cover 1 is sealed with the top of the bottom shell 5 and a defogging component is provided. The sealing design aims to prevent water vapor from invading the interior of the scanner. Figure 3 As shown, a waterproof wire threading hole 501 is provided on the side of the bottom shell, and the cables of each component pass through the waterproof wire threading hole 501 using a gland and are respectively connected to the controller and the distribution cabinet. The controller is a PLC controller, and the controller is connected to the computer terminal. The controller and the computer terminal are arranged in the control cabinet, and the distribution cabinet is buried underground. The control cabinet is arranged on the side of the road for easy maintenance. The computer terminal is provided with a display screen. The scanner also includes a license plate capture camera and a position sensor. The position sensor is connected to the controller, and the license plate capture camera is connected to the computer terminal and the controller respectively. The license plate capture camera is an existing license plate capture camera.

[0046] It should be noted that the license plate capture camera can be placed on the bracket, and the position sensor can be placed at a suitable position on the bracket. The position sensor can be a photoelectric switch. The position sensor detects when a vehicle passes the bracket and sends a signal to the controller, so that the controller controls the opening of the fill light and controls the license plate capture camera to take a photo of the license plate from the front or rear side of the vehicle.

[0047] refer to Figure 2 and Figure 3 As shown, a sealing strip 513 is added between the device upper cover 1 and the device bottom shell 2, and the sealing strip 513 is limited by a sealing strip fixing frame 514 to ensure the best sealing effect.

[0048] The demisting component includes a dehumidifier 508 and a circulation fan 509 arranged inside the bottom shell. The fill light assembly, camera, circulation fan 509 and dehumidifier 508 are separately connected to the controller; wherein, the circulation fan 509 is arranged on one side of the fill light assembly, and the circulation fan 509 is spaced apart from the reflective assembly. The circulation fan is installed through a circulation fan holder 510. There are 3 circulation fans 509, and of course other numbers are also possible. The circulation fans blow towards the reflector and the transparent part 3 respectively and are controlled by the dehumidifier. The dehumidifier 508 The power supply is connected to the distribution cabinet through the junction box 502, the dehumidifier is connected to the dehumidification bag, a dehumidifier is set in the dehumidification bag, the cable of the dehumidifier 508 is connected to the controller after passing through the waterproof threading hole 501, and the built-in temperature and humidity sensor of the dehumidifier 508 sends temperature and humidity data to the controller in real time and displays it through the computer terminal. When the humidity exceeds the set value or the user finds that the reflector and the transparent part 3 are fogged, the dehumidifier 508 is turned on by the controller to work, and the circulation fan 509 is driven to work. When the humidity is lower than the set value, the demisting component stops working.

[0049] It is easy to understand that the transparent part 3 is made of transparent glass, and the transparent part 3 and the upper cover 1 are fixed with screws and glass glue. Anti-pressure parts 2 are respectively provided on both sides of the transparent part 3 on the surface of the upper cover 1. The length of the anti-pressure part 2 is greater than the length of the transparent part 3, and the height of the anti-pressure part 2 is greater than the height of the transparent part 3. Because the width of the transparent part is narrow, it can also effectively prevent the tire from directly pressing on the transparent glass. The setting of the anti-pressure part 2 effectively protects the transparent part. The anti-pressure part 2 is made of stainless steel and its function is to prevent the tire from directly pressing on the transparent glass and causing damage and dirt to the transparent glass. A maintenance port is provided on the side of one of the anti-pressure parts. Figure 4 As shown, a cover plate 4 is provided at the maintenance port, and the cover plate 4 is detachable relative to the maintenance port, and the camera 503 is placed below the maintenance port.

[0050] In the scanner provided in this embodiment, the width of the transparent part 3 is less than or equal to 5 cm, the overall dimensions of the ultra-thin distortion-free underbody scanner are 1875 mm × 770 mm × 160 mm, and the width of the reflector is also less than or equal to 5 cm. Because the reflectors are all set at an angle, they will not affect the fill light effect. Camera windowing technology is used in the front and rear directions of the underbody, and combined with the motion vector estimation algorithm based on optical flow to perform underbody image stitching. The forward motion of the vehicle is used to gradually cover the front and rear of the vehicle. The windowing technology is used to only capture a very narrow image of about 5 cm in the front and rear directions of the vehicle per frame.

[0051] To install the ultra-thin, distortion-free undercar scanner, a shallow pit slightly larger than the vehicle's overall dimensions must be dug in the ground below the vehicle. The pit is then leveled, and the scanner and power distribution cabinet are placed inside. Connecting the scanner to the computer terminal, the pit is then backfilled to ensure the top surface of the scanner is flush with the ground. Each time the vehicle moves a short distance above the scanner, a portion of the vehicle's chassis is reflected in the reflector and captured by the industrial area array camera through lens 504. This image is then transmitted to the computer terminal for stitching. As the vehicle continues to advance, the industrial area array camera gradually captures all images from the front to the rear of the vehicle. After the vehicle leaves, the computer terminal completes the image stitching, combines it with the license plate information, and generates a complete record for storage or distribution to other systems.

[0052] Example 2 This embodiment discloses a method for scanning the vehicle bottom condition, using the ultra-thin, distortion-free vehicle bottom scanner described in the first embodiment, and includes the following contents: A camera 3 and a reflective assembly 511 are provided inside the bottom shell 5. An upper cover 1 is installed on the top of the bottom shell 3. A transparent member 3 is installed on the upper cover 1. The transparent member 3 is placed above the third reflective member 517 to form an ultra-thin, distortion-free vehicle bottom scanner. The ultra-thin distortion-free vehicle underbody scanner is placed underground with the transparent member 3 exposed. The ultra-thin distortion-free vehicle underbody scanner buried underground will not interfere with the normal driving of the vehicle. The transparent member 3 is arranged along the width direction of the vehicle. When a vehicle enters the detection lane and triggers the position sensor, the position sensor sends a signal to the controller, which controls the fill light 506 to light up and starts the license plate capture camera to capture the license plate image information and send it to the computer terminal to identify the license plate number; When a vehicle passes through the ultra-thin distortion-free vehicle bottom scanner, the camera 503 obtains multiple images of the vehicle bottom through the reflective component 511 and sends them to the computer terminal; The computer terminal calculates the sub-pixel displacement of the two frames of image based on the motion vector estimation algorithm of optical flow, stitches the images of the vehicle bottom, and generates and stores a complete record based on the recognized license plate number.

[0053] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention are intended to be within the scope of protection of the present invention.

Claims

1. An ultra-thin, distortion-free vehicle bottom scanner, characterized in that: The system comprises a bottom shell and an upper cover. A cavity is provided inside the bottom shell. A camera and a reflective assembly are provided in the cavity. The camera is provided with a lens. The reflective assembly comprises a plurality of reflective elements for lengthening the object distance along the lateral direction of the bottom shell to limit the height of the bottom shell. The upper cover is installed on the top of the bottom shell. The upper cover is provided with a transparent element. The transparent element is placed above the last reflective element through which the camera light path passes. The camera light path passes through the reflective assembly and reaches the bottom of the vehicle to obtain the image information of the bottom of the vehicle and sends it to the computer terminal. The computer terminal calculates the displacement of the two frames of images and performs the splicing of the images of the bottom of the vehicle.

2. The ultra-thin, distortion-free vehicle bottom scanner according to claim 1, characterized in that: The reflective assembly includes at least three reflective elements, and the camera light path is made to be vertically upward after passing through the multiple reflective elements. Some of the reflective elements are spaced apart from the camera, and the camera is placed close to the last reflective element passed by the camera light path; The width of each reflector is less than or equal to 5 cm.

3. The ultra-thin, distortion-free vehicle bottom scanner according to claim 2, characterized in that: The reflective assembly includes a first reflector, a second reflector and a third reflector. The first reflector and the second reflector are arranged opposite to each other, and the third reflector is set at a distance from the second reflector. The third reflector is arranged opposite to the second reflector. The camera light path passes through the first reflector in sequence and is reflected to the second reflector, and then reaches the third reflector and is reflected upward.

4. The ultra-thin, distortion-free vehicle bottom scanner according to claim 3, characterized in that: The first reflector and the second reflector are arranged at 90 degrees, the first reflector and the second reflector are fixed to the inside of the bottom shell through a first support base, and the third reflector is fixed to the inside of the bottom shell through a second support base.

5. The ultra-thin, distortion-free vehicle bottom scanner according to claim 1, characterized in that: The bottom shell is further provided with a fill light assembly, which includes a plurality of fill light lamps, and the fill light lamps emit light toward the transparent member; The width of the transparent part is less than or equal to 5 cm.

6. The ultra-thin, distortion-free vehicle bottom scanner according to claim 5, characterized in that: A plurality of fill lights are arranged on both sides of the camera. The fill lights are placed on the side of the last reflective component where the camera light path passes, and the fill light assembly is placed below the transparent component.

7. The ultra-thin, distortion-free vehicle bottom scanner according to claim 5, characterized in that: A dehumidifier and a circulation fan are further provided inside the bottom shell, and the fill light assembly, the circulation fan and the dehumidifier are separately connected to a controller, and the controller is connected to the computer terminal; The circulation fan is arranged on one side of the fill light assembly, and a distance is set between the circulation fan and the reflective assembly.

8. The ultra-thin, distortion-free vehicle bottom scanner according to claim 7, characterized in that: It also includes a license plate capture camera and a position sensor. The license plate capture camera is connected to the computer terminal and the controller respectively, and the position sensor is connected to the controller.

9. The ultra-thin, distortion-free vehicle bottom scanner according to claim 1, characterized in that: The upper cover is sealed and connected to the top of the bottom shell; The upper cover surface is provided with anti-pressure parts on both sides of the transparent part, and the length of the anti-pressure parts is greater than that of the transparent part. A maintenance port is provided on the side of one of the anti-pressure parts, and a cover is provided at the maintenance port. The camera is placed below the maintenance port.

10. A method for scanning vehicle bottom conditions, characterized in that: An ultra-thin, distortion-free vehicle bottom scanner according to any one of claims 1 to 9, comprising the following contents: A camera and a reflective component are arranged inside the bottom shell, an upper cover is installed on the top of the bottom shell, and a transparent part is installed on the upper cover. The transparent part is placed above the last reflective part where the camera light path passes, forming an ultra-thin and distortion-free vehicle bottom scanner; The ultra-thin distortion-free vehicle bottom scanner is placed underground with the transparent parts exposed. The transparent parts are arranged along the width of the vehicle. When the vehicle passes through the ultra-thin distortion-free vehicle bottom scanner, the camera captures multiple images of the vehicle bottom through the reflective component and sends them to the computer terminal. The computer terminal calculates the sub-pixel displacement of the two frames of image based on the motion vector estimation algorithm of optical flow and performs the splicing of the vehicle bottom image.

Images