A road milepost number recognition device and correction method

Abstract

The application discloses a kind of road mileage stake number identification device and correction method, it is related to road mileage measurement technical field, including mounting frame, mounting frame is installed with mileage wheel, the wheel surface of mileage wheel is contacted with ground, camera is installed at mileage wheel, and mileage wheel is also provided with trigger mechanism, trigger mechanism and camera are configured, mileage wheel is after driving a fixed distance, trigger mechanism triggers camera to take a photo to stake number direction once.This application is aimed at the position of vehicle when taking a photo in the actual photo identification in prior art, the position of vehicle when taking a photo can exist in the misalignment of stake number, therefore, the actual distance of vehicle at this time cannot accurately represent the actual distance of this stake number, and the correction coefficient obtained also has error and other problems are improved.This application has the advantages that by setting two laser emitters, when taking a photo, the laser points emitted by the two laser emitters can be used as reference to obtain more accurate data.

Description

Technical Field

[0001] This invention relates to the field of road mileage measurement technology, and in particular to a road mileage marker identification device and correction method. Background Technology

[0002] With the rapid development of transportation in my country, accurately locating damage to highways can improve the efficiency of road maintenance and reduce the incidence of highway traffic accidents. Therefore, it is necessary to correct the mileage markers on road guardrails so that the marker information can be sent to road maintenance personnel during maintenance work. Based on this information, road maintenance personnel can quickly locate the damaged area, thereby improving maintenance efficiency.

[0003] In existing technologies, such as the automatic mileage marker correction method, system, and device with application number 201310088986.8, the mileage marker correction typically involves taking photos of the roadside scene at fixed driving distances to obtain roadside scene images. After driving a certain distance, multiple roadside scene images are obtained. All roadside scene images are then numbered according to the order in which they were taken. The actual distance to the mileage marker is calculated based on the difference in numbers between two displayed mileage marker images and the fixed driving distance. A correction coefficient is then obtained based on the ratio of the actual distance to the displayed distance. This correction coefficient is used to determine the mileage represented by the actual mileage marker. Therefore, the mileage represented by the interval between each photo needs to be highly accurate to obtain the precise actual distance between any two mileage markers, thus obtaining an accurate correction coefficient. However, in actual photo recognition, the vehicle's position when taking a photo of a mileage marker may result in misalignment of the markers. Therefore, the actual driving distance of the vehicle in this case cannot accurately represent the actual distance of the mileage marker, leading to errors in the obtained correction coefficient and affecting subsequent mileage calculations.

[0004] To address the above technical problems, this invention discloses a road mileage marker identification device and correction method. This invention has advantages such as setting up two laser emitters so that when taking pictures, the laser points emitted by the two laser emitters can be used as a reference to obtain more accurate data. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a road mileage marker identification device and correction method to solve the problem that in the actual photo identification process, the vehicle's position may be misaligned when the marker is photographed. Therefore, the actual distance traveled by the vehicle cannot accurately represent the actual distance of the marker, and the obtained correction coefficient will also have errors, affecting subsequent mileage calculations. This invention has the advantages of setting two laser emitters, so that the laser points emitted by the two laser emitters can be used as a reference when taking pictures, thus obtaining more accurate data.

[0006] This invention is achieved through the following technical solution: This invention discloses a road mileage marker identification device, including a mounting frame for installation on the front bumper of a vehicle. A mileage wheel is mounted on the mounting frame, with the wheel surface of the mileage wheel in contact with the ground. A camera is mounted on the mileage wheel, and a triggering mechanism is also provided at the mileage wheel. The triggering mechanism and camera are configured such that after the mileage wheel travels a fixed distance, the triggering mechanism activates the camera to take a picture in the direction of the mileage marker. A main controller is mounted on the mileage wheel, and both the camera and the triggering mechanism are connected to the main controller via wires.

[0007] The triggering mechanism includes a housing, a mounting frame, a transmitting module, a receiving module, and a transmission disc. The housing is located at the front end of the wheel. The mounting frame is fixedly installed inside the housing. The mounting frame includes a fixing plate and a connecting plate. There are two fixing plates, which are arranged parallel to each other. One end of each fixing plate is fixedly connected to a connecting plate. The transmitting module and the receiving module for receiving signals from the transmitting module are respectively installed on the opposite sides of the two fixing plates. A transmission disc is installed between the receiving module and the transmitting module to block the signal. The transmission disc rotates synchronously with the odometer wheel. A clearance hole is provided on the transmission disc. When the transmission disc rotates, the axes of the transmitting module and the receiving module are on the movement trajectory of the clearance hole.

[0008] Furthermore, a connecting rod is fixedly installed on one side of the mounting bracket, and a pressing component is installed at the bottom of one end of the connecting rod. A mileage wheel is installed below the pressing component, and the pressing component is used to control the mileage wheel to press down toward the ground.

[0009] Furthermore, the pressing assembly includes an outer tube, an inner rod, and an elastic element. The top end of the outer tube is fixedly connected to the connecting rod. The inner rod is slidably inserted into the inside of the outer tube, and the bottom end of the inner rod passes through the bottom wall of the outer tube and extends to the outside of the outer tube. An elastic element is provided above one end of the inner rod inside the outer tube.

[0010] Furthermore, the mileage wheel includes a wheel frame, a wheel axle, and a wheel body. The wheel frame is fixedly installed at the bottom end of the inner rod, the wheel body is rotatably mounted on the wheel frame, and the triggering mechanism is installed on the wheel frame.

[0011] Furthermore, the axle of the mileage wheel extends through the outer wall of the housing into the interior of the housing, and the end of the axle located inside the housing passes through two fixed plates. The axle is rotatably connected to the outer wall of the housing and the fixed plates respectively. The transmission disc is fixedly sleeved on the outside of the axle and is concentric with the axle. Multiple clearance holes are provided, and the multiple clearance holes are arranged in a circular array at equal intervals with the center of the transmission disc as the center. The clearance holes penetrate through the front and rear end faces of the transmission disc. The receiving module and the transmitting module are electrically connected to the main controller through wires.

[0012] Furthermore, a horizontal plate is fixed to the front of the wheel frame, the camera is mounted on the horizontal plate, and a laser assembly is also mounted on the horizontal plate.

[0013] Furthermore, the laser assembly includes laser emitter one and laser emitter two, both of which are used to emit laser beams. Laser emitter one and laser emitter two are arranged horizontally, and laser emitter one and the wheel axle are on the same vertical axis. The distance between laser emitter two and laser emitter one is the same as the distance traveled by the mileage wheel between two camera shots.

[0014] Furthermore, both the transmitting and receiving modules are movable. The transmission disk also has two types of clearance holes, and there are multiple clearance holes, the number of which is different from the number of clearance holes. The multiple clearance holes are arranged in an equidistant ring array on the transmission disk and are located on the outer ring of the clearance holes. Each of the two fixed plates has a sliding groove on its facing side, and a slider is slidably installed inside the groove. The transmitting and receiving modules are respectively fixedly installed on the two sliders. A pull rod is fixedly installed on one side of each slider, and one end of the pull rod extends to one side of the connecting plate. A translation drive component is installed on one side of the connecting plate. The translation drive component is used to control the horizontal movement of the slider. The laser emitter is in a movable state. A translation drive component is installed on the horizontal plate. The translation drive component is used to move the horizontal position of the laser emitter.

[0015] A calibration method for a road mileage marker identification device includes the following steps:

[0016] Step 1: First, install this device on the front bumper of the vehicle. Then, adjust the camera's photo trigger interval distance as required, and simultaneously adjust the distance between laser emitter 1 and laser emitter 2 so that the distance between laser emitter 1 and laser emitter 2 is the same as the distance the odometer wheel travels in each photo interval. For example, set the distance the odometer wheel travels in each photo interval to X.

[0017] Step Two: Start the vehicle. Simultaneously, laser emitter one and laser emitter two will be activated. The laser points emitted by laser emitter one and laser emitter two will be projected onto the road guardrail. As the vehicle moves forward, the odometer wheel will rotate. After each odometer wheel moves forward X distances, the camera will take a picture and number each picture. Every two adjacent numbered pictures represent a length of X. At the same time, the two laser points will also be captured. Since the distance between the two laser points is the same as X, both laser points will be captured by the camera as the vehicle moves forward.

[0018] Step 3: After driving a certain distance, obtain multiple photos, then find the photo containing the station number, and calculate the actual distance of the station number based on the positions of the two laser points in the photo containing the station number. Then, obtain the correction coefficient by the ratio of the actual distance to the distance displayed by the station number.

[0019] Furthermore, when the laser point of laser emitter one overlaps with the station number, it indicates that the wheel axle is aligned with this station number. The actual distance to this station number can be directly calculated based on the previous photo number. Similarly, when the laser point of laser emitter two overlaps with the station number, the actual distance to this station number can also be calculated based on the photo number. When the station number is located between two laser points, the distance between the station number and the laser point of laser emitter one can be calculated based on the proportional position of the station number in the photo and the actual distance between the two laser points. Then, the actual distance of the station number is obtained by adding the actual distance of the previous photo to the distance between the station number and the laser point of laser emitter one.

[0020] The present invention has the following advantages:

[0021] This invention, by setting up a mileage wheel, a triggering mechanism, and a laser component, allows for the correction of station numbers. Through the arrangement of a transmission disc, a clearance hole, a receiving module, a transmitting module, and a camera, the rotation of the transmission disc and the intermittent obstruction of the receiving and transmitting modules by the clearance hole during vehicle movement enable the camera to take intermittent photos, thus obtaining multiple images. The actual distance to the station number is calculated based on the photo numbers containing the station number, and a correction coefficient is obtained by comparing the actual distance with the displayed station number. Furthermore, by incorporating the laser component, when the vehicle's position is misaligned with the station number during actual photo recognition, two laser points can be used as references to calculate the actual distance to the station number, thereby improving the accuracy of the correction coefficient. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0023] Figure 2 This is a schematic diagram of the mileage wheel structure of the present invention;

[0024] Figure 3 This is a schematic diagram of the internal structure of the pressure-down component of the present invention;

[0025] Figure 4 This is a schematic diagram of the internal structure of the housing of the present invention;

[0026] Figure 5 This is a schematic diagram of the fixing frame structure of the present invention;

[0027] Figure 6 For the present invention Figure 5 A magnified schematic diagram of the structure at point B;

[0028] Figure 7 For the present invention Figure 2 A magnified schematic diagram of the structure at point A.

[0029] In the diagram: 1. Mounting bracket; 2. Mileage wheel; 3. Camera; 4. Trigger mechanism; 5. Main controller; 6. Connecting rod; 7. Pressing component; 8. Limiting plate; 9. Clearance hole one; 10. Horizontal plate; 11. Laser component; 12. Clearance hole two; 13. Slide groove; 14. Slider; 15. Pull rod; 16. Translation drive component one; 17. Translation drive component two; 201. Wheel frame; 202. Wheel axle; 203. Wheel body; 211. Top plate; 212. Vertical plate; 401. Box body; 402. Fixing frame; 403. Receiving module; 404. Transmitting module; 405. Transmission plate; 421. Fixing plate; 422. Connecting plate; 701. Outer tube; 702. Inner rod; 703. Elastic element; 111. Laser emitter one; 112. Laser emitter two. Detailed Implementation

[0030] The embodiments of the present invention are described in detail below. These embodiments are implemented based on the technical solution of the present invention, and provide detailed implementation methods and specific operation processes. However, the scope of protection of the present invention is not limited to the following embodiments. In the description of the present invention, words such as "front", "rear", "left", and "right" that indicate orientation or positional relationship are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0031] An embodiment discloses a road mileage marker identification device, such as Figures 1-7As shown, the device includes a mounting bracket 1, which is used to install on the front bumper of the vehicle. Specifically, in this embodiment, the mounting bracket 1 is detachably installed on the front bumper of the vehicle by screws, so that the vehicle can move synchronously with the mounting bracket 1 when it is moving. The mounting bracket 1 is equipped with a mileage wheel 2, the wheel surface of which is in contact with the ground. When the vehicle is moving, the mileage wheel 2 can rotate and move. It should be noted that the circumference of the mileage wheel 2 is set to a fixed value and is an integer. For example, in this embodiment, the circumference of the mileage wheel 2 is set to one meter, that is, the mileage wheel 2 travels one meter for every one revolution. Thus, the mileage wheel 2 is used to confirm the travel distance.

[0032] In addition, such as Figures 1-2 As shown, a camera 3 is installed at the mileage wheel 2, and a triggering mechanism 4 is also installed at the mileage wheel 2. The triggering mechanism 4 and the camera 3 are configured such that after the mileage wheel 2 travels a fixed distance, the triggering mechanism 4 activates the camera 3, causing the camera 3 to take a picture in the direction of the station number. A main controller 5 is also installed, and both the camera 3 and the triggering mechanism 4 are connected to the main controller 5 through wires. After the mileage wheel 2 travels a fixed distance each time, the camera 3 takes a picture and numbers the pictures. Then, the staff can calculate the actual travel distance of the mileage wheel 2 based on the number of the station number picture, and then obtain the correction coefficient based on the mileage represented by the station number.

[0033] Specifically, a connecting rod 6 is fixedly installed on one side of the mounting bracket 1, and a pressing component 7 is fixedly installed at the bottom of the end of the connecting rod 6 facing the vehicle driving direction. A mileage wheel 2 is installed below the pressing component 7. The pressing component 7 presses down the mileage wheel 2 so that the wheel surface of the mileage wheel 2 can always be in contact with the road surface, so that the mileage wheel 2 can rotate when the vehicle is driving.

[0034] like Figure 1 and Figure 3As shown, the pressing component 7 is configured to press down the odometer wheel 2 using elastic force. Specifically, it includes an outer tube 701, an inner rod 702, and an elastic element 703. The top end of the outer tube 701 is fixedly connected to the connecting rod 6, while the inner rod 702 is slidably inserted into the inside of the outer tube 701. The bottom end of the inner rod 702 passes through the bottom wall of the outer tube 701 and extends to the outside of the outer tube 701. More specifically, a through hole is formed in the bottom wall of the outer tube 701, and the inner rod 702 is slidably inserted into the through hole and passes through the bottom wall of the outer tube 701. It should be noted that the inner rod 702... 2. A limiting disk 8 is fixedly installed at one end inside the outer tube 701. The limiting disk 8 slides with the inner wall of the outer tube 701. An elastic element 703 is provided above the limiting disk 8. In this embodiment, the elastic element 703 is set as a spring. The two ends of the spring are in contact with the top wall inside the outer tube 701 and the limiting disk 8, respectively. The limiting disk 8 is pressed down by the spring, which in turn causes the inner rod 702 to be pressed down. The odometer wheel 2 is located at the bottom end of the inner rod 702 outside the outer tube 701. The odometer wheel 2 can be pressed down by the spring and always in contact with the ground.

[0035] like Figures 1-2 As shown, the mileage wheel 2 includes a wheel frame 201, a wheel axle 202, and a wheel body 203. The wheel frame 201 is fixedly installed at the bottom end of the inner rod 702. The wheel frame 201 is specifically composed of a top plate 211 and two vertical plates 212 installed below the top plate 211. The bottom end of the inner rod 702 is fixedly connected to the top plate 211. The wheel body 203 is installed between the two vertical plates 212. The two wheel axles 202 at the front and rear ends of the wheel body 203 are rotatably connected to the two vertical plates 212 of the wheel frame 201, respectively. The triggering mechanism 4 is installed at the front end of the wheel body 203. The camera 3 is activated to take pictures by rotating the mileage wheel 2.

[0036] like Figure 1 , Figure 2 , Figure 4 , Figure 5 , Figure 6As shown, the triggering mechanism 4 includes a housing 401, a fixing frame 402, a transmitting module 404, a receiving module 403, and a transmission disk 405. The housing 401 is located at the front end of the wheel 203 and is fixedly connected to the vertical plate 212 on the wheel frame 201. The fixing frame 402 is fixedly installed inside the housing 401. Specifically, the fixing frame 402 consists of two parallel fixing plates 421 and a connecting plate 422 that fixes the two fixing plates 421 at one end. The frame 402 is fixedly connected to the inner wall of the housing 401 by a fixing rod. A transmitting module 404 and a receiving module 403 are respectively provided on the opposite side of the two fixing plates 421, and the transmitting module 404 and the receiving module 403 are on the same axis. The transmitting module 404 is used to transmit signals toward the receiving module 403, and the receiving module 403 receives the signals transmitted by the transmitting module 404. In addition, a transmission disk 405 is provided between the receiving module 403 and the transmitting module 404 to block the signal.

[0037] More specifically, the axle 202 of the mileage wheel 2 extends through the outer wall of the housing 401 into the interior of the housing 401, and one end of the axle 202 inside the housing 401 passes through one end of each of the two fixing plates 421. It should be noted that the axle 202 is rotatably connected to both the outer wall of the housing 401 and the fixing plates 421. The transmission disc 405 is fixedly sleeved on the outside of the axle 202 and is concentric with it. The transmission disc 405 is located between the receiving module 403 and the transmitting module 404 to block the signal. The transmission disk 405 is also provided with a clearance hole 9. There are multiple clearance holes 9, and the multiple clearance holes 9 are arranged in a circular array at equal intervals with the center of the transmission disk 405 as the center. The clearance holes 9 penetrate through the front and rear end faces of the transmission disk 405, and the distance between the clearance hole 9 and the center of the transmission disk 405 is the same as the distance between the receiving module 403 and the center of the transmission disk 405. In other words, when the transmission disk 405 rotates, the same axis of the transmitting module 404 and the receiving module 403 is on the movement trajectory of the clearance hole 9.

[0038] In addition, both the receiving module 403 and the transmitting module 404 are electrically connected to the main controller 5 via wires. Specifically, when the receiving module 403 receives the signal sent by the transmitting module 404, the camera 3 starts taking pictures.

[0039] Therefore, when the transmission disk 405 rotates, the multiple clearance holes 9 allow the receiving module 403 to intermittently receive signals emitted by the transmitting module 404. Then, the receiving module 403 transmits the signals to the main controller 5, and the main controller 5 controls the camera 3 to take a picture. Thus, in this embodiment, when the mileage wheel 2 rotates, the transmission disk 405 rotates synchronously. Whenever the clearance hole 9 moves to the position on the axis between the transmitting module 404 and the receiving module 403, the receiving module 403 will receive a signal, and then the camera 3 will take a picture.

[0040] Since the circumference of the mileage wheel 2 is a fixed value, and multiple clearance holes 9 are arranged in an equidistant circular array, the distance traveled by the mileage wheel 2 is the same when each clearance hole 9 rotates to the axis position of the transmitting module 404 and the receiving module 403. For example, when the circumference of the mileage wheel 2 is one meter, and the number of clearance holes 9 is set to ten, the mileage wheel 2 travels ten centimeters when each clearance hole 9 rotates to the axis position of the transmitting module 404 and the receiving module 403. In other words, the camera 3 takes a picture every ten centimeters the mileage wheel 2 moves forward. Therefore, every two adjacent numbered photos represent ten centimeters traveled by the mileage wheel 2. Thus, the photos can be viewed later, and the actual distance traveled by the mileage wheel 2 can be calculated based on the number of the photos containing the station number. Then, a correction coefficient can be calculated based on the distance represented by the station number.

[0041] However, considering that in actual photo recognition, the vehicle may be misaligned when the mileage marker is captured, the actual distance traveled by the vehicle cannot accurately represent the actual distance to the mileage marker. Consequently, the correction coefficient obtained will also have errors, affecting subsequent mileage calculations.

[0042] Therefore, in order to improve the accuracy of calculations, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, a horizontal plate 10 is fixedly installed on the front end face of the vertical plate 212 at the front end of the wheel frame 201, and the horizontal plate 10 is perpendicular to the vertical plate 212 of the wheel frame 201. The camera 3 is mounted on the horizontal plate 10, and a laser assembly 11 is also installed on the horizontal plate 10. The laser assembly 11 specifically includes a laser emitter 111 and a laser emitter 112. Both laser emitter 111 and laser emitter 112 are laser pointer type devices, specifically used to emit laser beams. The laser emitter 111 and laser emitter 112 are arranged horizontally, and the laser emitter 111... The laser emitter 111 and the axle 202 are on the same vertical axis. In other words, the laser point emitted by laser emitter 111 represents the position of axle 202. The distance between laser emitter 112 and laser emitter 111 is the same as the distance traveled by the mileage wheel 2 between each two photo intervals. In addition, it should be noted that the laser points emitted by laser emitter 111 and laser emitter 112 are both within the lens range of camera 3, so that two laser points will be captured in the photo each time a photo is taken, and the distance between these two laser points is the same as the distance traveled by the mileage wheel 2 between each two photo intervals.

[0043] With the above settings, during actual station calibration, the vehicle's movement causes the mileage wheel 2 to rotate. As the mileage wheel 2 rotates, the clearance hole 9 allows the signal emitted by the transmitting module 404 to be intermittently received by the receiving module 403. The receiving module 403 can then intermittently transmit the signal to the main controller 5, thereby controlling the camera 3 to take intermittent photos. The lasers emitted by laser emitters 111 and 112 are both captured by the camera 3. Furthermore, when the two laser points move to the station location, they are also captured. When the wheel axle... When station 202 is not aligned with the station number, since laser emitter 111 and axle 202 are on the same vertical axis, the laser point emitted by laser emitter 111 represents the position of axle 202. Therefore, based on the proportional position of the station number between the two laser points, the distance between the station number and the laser point emitted by laser emitter 111 can be calculated based on the actual distance between the two laser points. Then, by adding this calculated distance to the driving distance represented by the previous photo number, the actual distance of the station number can be obtained, thus making the calculation of the correction coefficient more accurate.

[0044] However, considering that to improve adaptability, other embodiments may require a shooting interval distance of 20 centimeters or other values, therefore, in this embodiment, such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, both the transmitting module 404 and the receiving module 403 are set to a movable state. Correspondingly, the outer ring of the multiple clearance holes 9 arranged in a ring on the transmission disk 405 is provided with multiple clearance holes 12 arranged in a ring array at equal intervals.

[0045] Specifically, in this embodiment, the number of clearance holes 12 on the transmission disc 405 can be set to five. Therefore, the distance traveled by the mileage wheel 2 during the shooting interval is twenty centimeters. In addition, a sliding groove 13 is provided on the facing side of the two fixed plates 421, and a slider 14 is slidably arranged inside the sliding groove 13. The transmitting module 404 and the receiving module 403 are both fixedly installed on the two sliders 14. A pull rod 15 is fixedly provided on one side of each of the two sliders 14, and one end of the pull rod 15 extends to one side of the connecting plate 422. A translation drive component 16 is installed on one side of the connecting plate 422. In this embodiment, the translation drive component 16 is set as a lead screw linear mechanism and is driven by a motor. The pull rod 15 is connected to the moving part on the lead screw linear mechanism, and then the lateral position of the receiving module 403 and the transmitting module 404 is controlled by the motor, so that the transmitting module 404 and the receiving module 403 can move to the movement trajectory of the clearance hole 12, thereby making the triggering distance of the camera 3 twenty centimeters.

[0046] Accordingly, in order to make the spacing of the laser points match the trigger distance of the camera 3's shooting interval, the laser emitter 112 is set to a moving state, and a translation drive component 17 is set on the horizontal plate 10. The translation drive component 17 is also a lead screw linear mechanism, which moves the horizontal position of the laser emitter 112, thereby improving the applicability of the device.

[0047] A calibration method for a road mileage marker identification device includes the following steps:

[0048] Step 1: First, install this device on the front bumper of the vehicle. Then, adjust the photo triggering interval distance of camera 3 as required, and simultaneously adjust the distance between laser emitter 111 and laser emitter 212. Control the displacement of receiver module 403 and transmitter module 404 through the lead screw linear mechanism so that transmitter module 404 and receiver module 403 can move onto the movement trajectory of clearance hole 22. At the same time, control the movement of laser emitter 212 through the lead screw linear mechanism on the cross plate 10 so that the distance between laser emitter 111 and laser emitter 212 can be the same as the distance traveled by mileage wheel 2 in each photo interval of camera 3. For example, set the distance traveled by mileage wheel 2 in each photo interval of camera 3 to X.

[0049] Step 2: Start the vehicle. At the same time, laser emitter 111 and laser emitter 212 are turned on. The laser points emitted by the laser emitters 111 and 212 will hit the road guardrail, causing the vehicle to move forward. The vehicle's movement will drive the odometer wheel 2 to rotate. After the odometer wheel 2 moves forward X distances, the camera 3 will take a picture and number each picture. Every two adjacent numbered pictures represent a length of X. At the same time, the two laser points will also be photographed. Since the distance between the two laser points is the same as X, both laser points will be photographed by the camera 3 as the vehicle moves forward.

[0050] Step 3: After driving a certain distance, obtain multiple photos. Then, select the photo containing the station number and calculate the actual distance to that station based on the positions of the two laser points in the photo. When one of the two laser points overlaps with a station number, the actual distance can be calculated from the distance between the two laser points. For example, when the laser point of laser emitter 111 overlaps with a station number, it means that axle 202 is aligned with that station number. The actual distance to this station can be directly calculated based on the previous photo number. Similarly, when the laser point of laser emitter 212 overlaps with a station number, the actual distance can be calculated based on the distance between the two laser points. The photo number is used to calculate the actual distance to this station number. When the station number is located between two laser points, the distance between the station number and the laser point of laser emitter 111 can be calculated based on the proportional position of the station number in the photo and the actual distance between the two laser points. Then, the actual distance of the previous photo is calculated by adding the actual distance of the station number to the distance of the laser point of laser emitter 111 to obtain the actual distance of this station number. Finally, the ratio of the actual distance to the distance displayed by the station number is used to obtain the correction coefficient. It should be noted that the staff can use a ruler or other tools to measure the proportion of the station number in the two laser points.

[0051] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A road mileage marker identification device, comprising a mounting frame (1), characterized in that, The mounting bracket (1) is used to install on the front bumper of the vehicle. A mileage wheel (2) is installed on the mounting bracket (1). The wheel surface of the mileage wheel (2) is in contact with the ground. A camera (3) is installed on the mileage wheel (2). A triggering mechanism (4) is also provided on the mileage wheel (2). The triggering mechanism (4) and the camera (3) are configured such that after the mileage wheel (2) travels a fixed distance, the triggering mechanism (4) activates the triggering camera (3) to take a picture of the station direction. A master controller (5) is installed on the mileage wheel (2). The camera (3) and the triggering mechanism (4) are both connected to the master controller (5) through wires. The triggering mechanism (4) includes a housing (401), a fixing frame (402), a transmitting module (404), a receiving module (403), and a transmission disc (405). The housing (401) is located at the front end of the wheel (203). The fixing frame (402) is fixedly installed inside the housing (401). The fixing frame (402) includes a fixing plate (421) and a connecting plate (422). There are two fixing plates (421), and the two fixing plates (421) are arranged parallel to each other. One end of the two fixing plates (421) is fixedly connected to the connecting plate (422). The two fixed plates (421) are respectively provided with a transmitting module (404) and a receiving module (403) for receiving signals from the transmitting module (404) on their opposite sides. A transmission disk (405) is provided between the receiving module (403) and the transmitting module (404) to block the signal. The transmission disk (405) rotates synchronously with the mileage wheel (2), and a clearance hole (9) is provided on the transmission disk (405). When the transmission disk (405) rotates, the axes of the transmitting module (404) and the receiving module (403) are on the movement trajectory of the clearance hole (9). The mileage wheel (2) includes a wheel frame (201), a wheel axle (202) and a wheel body (203). The wheel frame (201) is fixedly installed at the bottom end of the inner rod (702), and the wheel body (203) is rotatably installed on the wheel frame (201). The triggering mechanism (4) is installed on the wheel frame (201). A horizontal plate (10) is fixedly provided at the front of the wheel frame (201), the camera (3) is mounted on the horizontal plate (10), and a laser assembly (11) is also provided on the horizontal plate (10). The laser assembly (11) includes a laser emitter one (111) and a laser emitter two (112). Both laser emitter one (111) and laser emitter two (112) are used to emit laser beams. Laser emitter one (111) and laser emitter two (112) are arranged horizontally, and laser emitter one (111) and the wheel axle (202) are on the same vertical axis. The distance between laser emitter two (112) and laser emitter one (111) is the same as the distance traveled by the mileage wheel (2) between two camera shots.

2. The road mileage marker identification device as described in claim 1, characterized in that, A connecting rod (6) is fixedly provided on one side of the mounting bracket (1). A pressing component (7) is provided at the bottom of one end of the connecting rod (6). A mileage wheel (2) is installed below the pressing component (7), and the pressing component (7) is used to control the mileage wheel (2) to press down toward the ground.

3. The road mileage marker identification device as described in claim 2, characterized in that, The pressing assembly (7) includes an outer tube (701), an inner rod (702), and an elastic element (703). The top end of the outer tube (701) is fixedly connected to the connecting rod (6). The inner rod (702) is slidably inserted into the inside of the outer tube (701), and the bottom end of the inner rod (702) passes through the bottom wall of the outer tube (701) and extends to the outside of the outer tube (701). An elastic element (703) is provided above one end of the inner rod (702) inside the outer tube.

4. The road mileage marker identification device as described in claim 3, characterized in that, The axle (202) of the mileage wheel (2) extends through the outer wall of the housing (401) to the interior of the housing (401), and one end of the axle (202) inside the housing (401) passes through the two fixing plates (421). The axle (202) is rotatably connected to the outer wall of the housing (401) and the fixing plate (421) respectively. The transmission disk (405) is fixedly sleeved on the outside of the axle (202) and is concentric with the axle (202). Multiple clearance holes (9) are provided, and multiple clearance holes (9) are arranged in an equidistant ring array with the center of the transmission disk (405) as the center. The clearance holes (9) penetrate the front and rear end faces of the transmission disk (405). The receiving module (403) and the transmitting module (404) are electrically connected to the main controller (5) through wires.

5. The road mileage marker identification device as described in claim 4, characterized in that, Both the transmitting module (404) and the receiving module (403) are configured to be movable. The transmission disk (405) also has a second type of clearance hole (12), and multiple clearance holes (12) are provided. The number of clearance holes (12) is different from the number of clearance holes (9). Multiple clearance holes (12) on the transmission disk (405) are arranged in an equidistant ring array and positioned around the outer edge of clearance holes (9). Each of the two fixing plates (421) has a sliding groove (13) on its facing side. A slider (14) is slidably disposed inside the sliding groove (13). The transmitting module (404) and the receiving module... Block (403) is fixedly installed on the two sliders (14). A pull rod (15) is fixedly provided on one side of each of the two sliders (14), and one end of the pull rod (15) extends to one side of the connecting plate (422). A translation drive component (16) is installed on one side of the connecting plate (422). The translation drive component (16) is used to control the slider (14) to move horizontally. The laser emitter (112) is set to a moving state. A translation drive component (17) is installed on the horizontal plate (10). The translation drive component (17) is used to move the horizontal position of the laser emitter (112).

6. A calibration method for a road mileage marker identification device according to claim 5, characterized in that, Includes the following steps: Step 1: First, install this device on the front bumper of the vehicle. Then, adjust the photo triggering interval distance of the camera (3) as required, and at the same time adjust the distance between laser emitter 1 (111) and laser emitter 2 (112) so that the distance between laser emitter 1 (111) and laser emitter 2 (112) can be the same as the distance traveled by the mileage wheel (2) in each photo interval of the camera (3). Set the distance traveled by the mileage wheel (2) in each photo interval of the camera (3) to X. Step 2: Start the vehicle and simultaneously turn on laser emitter 1 (111) and laser emitter 2 (112). The laser points emitted by laser emitter 1 and laser emitter 2 (112) will be projected onto the road guardrail. As the vehicle moves forward, the mileage wheel (2) will rotate. After each mileage wheel (2) moves forward X lengths, the camera (3) will take a picture and number each picture. Each pair of adjacent numbered pictures represents a length of X. At the same time, the two laser points will also be photographed. Since the distance between the two laser points is the same as X, as the vehicle moves forward, both laser points will be photographed by the camera (3). Step 3: After driving a certain distance, obtain multiple photos, then find the photo containing the station number, and calculate the actual distance of the station number based on the positions of the two laser points in the photo containing the station number. Then, obtain the correction coefficient by the ratio of the actual distance to the distance displayed by the station number.

7. The calibration method for a road mileage marker identification device as described in claim 6, characterized in that, When the laser point of laser emitter one (111) overlaps with the station number, it means that the wheel axle (202) is aligned with the station number. The actual distance of the station number can be directly calculated based on the previous photo number. Similarly, when the laser point of laser emitter two (112) overlaps with the station number, the actual distance of the station number can also be calculated based on the previous photo number. When the station number is located between two laser points, the distance between the station number and the laser point of laser emitter one (111) can be calculated based on the ratio of the station number to the two laser points in the photo and the actual distance between the two laser points. Then, the actual distance of the station number is obtained by adding the actual distance of the previous photo to the distance between the station number and the laser point of laser emitter one (111).

Images