A method for aligning a camera with an LED large screen

Abstract

The application provides a method for aligning a camera with an LED large screen, comprising the following steps: S1, setting a sighting plane mirror mechanism in front of the LED large screen and a camera which needs to be aligned with the LED large screen; S2, adjusting the position of the sighting plane mirror relative to the LED large screen; S3, adjusting the tripod and the connecting platform to the control machine display screen so that the camera lens reflection and the second crosshair reflection can be seen; S4, adjusting the tripod and the connecting platform to the control machine display screen so that the second crosshair reflection coincides with the first crosshair; and S5, removing the sighting plane mirror mechanism. The application can realize that the camera lens is maximally close to the vertical with the LED large screen during the debugging process, and the operation of aligning the camera with the LED large screen is completed.

Description

Technical Field

[0001] This invention belongs to the field of virtual simulation technology, specifically relating to a method for aligning a camera with an LED screen. Background Technology

[0002] In recent years, the application of LED large screens has become increasingly popular. Many press conferences, TV programs and even film shooting have adopted LED-based large screen display technology, and virtual display technology based on LED large screens has also become an important branch of virtual reality applications.

[0003] In virtual display technology based on LED large screens, cinema cameras or television-grade cameras must be used as observers to monitor the content displayed on the LED screen. This is because, firstly, the output display effect is based on the image presented by the camera, requiring the camera to capture and broadcast the content displayed on the LED large screen. Secondly, changes in the virtual scene presented on the LED large screen require adjustments to the virtual scene based on the real-time spatial position of the camera transmitted by the position sensor attached to the camera. However, in practice, there are errors between the real camera and the virtual camera calculated by the position sensor in the domains of spatial position and spatial rotation angle. The errors between the real and virtual cameras have a total of six components: three components for position (X, Y, Z) and three components for rotation (Pitch, Yaw, Roll). Effectively eliminating the errors between the real and virtual cameras can reduce the computational load of subsequent virtual scene modeling and analysis, and improve the presentation effect of the virtual scene.

[0004] By aligning the camera with an LED screen, especially vertically aligning it, the three rotational components (Pitch, Yaw, Roll) between the real and virtual cameras can be made approximately zero. This significantly reduces the amount of data required for error correction analysis between the real and virtual cameras, lowers the computational load for subsequent virtual scene modeling and analysis, and improves the presentation of the virtual scene. A common existing method is to display relevant or irrelevant content on the LED screen, and then manually correct the camera before actual shooting. This involves manually observing and adjusting the camera's height, angle, and deflection to make the camera as perpendicular to the LED screen as possible. However, manual correction has several drawbacks: 1. The camera's perpendicularity depends entirely on the operator's observation, and it is known that subtle angular deflections are difficult to detect with the naked eye. Therefore, it is often difficult to achieve a near-perpendicular state, and some correction error is often present. 2. Manual correction is affected by factors such as the operator's experience, working condition, and physical differences, resulting in fluctuating correction effectiveness and inconsistent error values ​​after each correction. The reasons mentioned above mean that manual correction cannot actually determine whether the camera is truly perpendicular or nearly perpendicular to the PED screen. Therefore, it is impossible to directly approximate the three rotation components (Pitch, Yaw, and Roll) to 0. Instead, it is necessary to perform pre-correction error analysis and correction. Furthermore, the parameters also need to be corrected during subsequent virtual reality data analysis. As a result, the amount of data analysis has not been substantially reduced. Summary of the Invention

[0005] This invention addresses the shortcomings of existing technologies by providing a method for aligning a camera with an LED screen, comprising:

[0006] S1. A plane mirror for aiming and a camera that needs to be aligned with the LED screen are set up in front of the LED screen; the plane mirror for aiming is equipped with a first crosshair; two sets of traction ropes are fixed at two fixed points on the top of the plane mirror at the same position on the left and right of the center of the plane mirror; plumb lines of the same length are fixed on the two sets of traction ropes at the same position on the fixed points; a plumb bob of the same size is fixed at the bottom of each of the two plumb lines; a transparent plate is hung in front of the camera lens; a second crosshair is set on the transparent plate at the center point of the camera lens; the camera is fixed on a tripod through a connecting platform; the signal output terminal of the camera is connected to a control unit with a display screen through a signal cable or wireless network.

[0007] S2. First, wind up the traction rope so that the aiming plane mirror is suspended in front of the LED screen; then, by winding up the traction rope appropriately, adjust the plumb line and the plumb bob so that the plumb line is taut under the natural downward force of the plumb bob, and the plumb bob just lightly touches the bottom surface of the LED screen.

[0008] S3. Adjust the tripod and connecting platform until the reflections of the aiming plane mirror, the camera lens located in the aiming plane mirror, and the second crosshair are observed on the control unit's display screen.

[0009] S4. By adjusting the tripod and connecting platform, the reflection of the second crosshair on the control unit's display screen is made to coincide with the first crosshair, at which point the camera lens is almost perpendicular to the aiming plane mirror.

[0010] S5. Remove the aiming plane mirror, traction rope, plumb line, plumb bob, and transparent plate to complete the operation of aligning the camera with the LED screen.

[0011] Furthermore, the traction rope is fixed to the drum of the electrically controlled winch after its direction is adjusted by a certain pulley system.

[0012] Furthermore, the connection platform includes a lower base and an upper base. The bottom of the lower base is fixed to the top of the tripod. The lower base houses a first microcontroller and at least three electrically controlled lifting mechanisms. The signal output terminal of the first microcontroller is connected to the control signal input terminal of the electrically controlled lifting mechanism. The lifting end of each electrically controlled lifting mechanism extends to the outer side of the top of the lower base and is fixed to the bottom of the upper base. The upper base houses an electronic gyroscope, and the signal output terminal of the electronic gyroscope is connected to the signal input terminal of the first microcontroller.

[0013] Furthermore, the connection platform includes an electrically controlled rotary table. The camera is mounted on the rotating end of the electrically controlled rotary table.

[0014] Furthermore, the camera is mounted on the rotating end of the electronically controlled rotary table via an angle adjustment device. The angle adjustment device includes a rotating base fixed to the rotating end of the electronically controlled rotary table, and the outer wall of the camera is rotatably mounted on the rotating base via a rotating shaft. A connecting rod is fixed to the back of the camera lens, and a guide rail is provided on one side of the connecting rod in a vertical direction. The bottom of the guide rail is fixed to the rotating end of the electronically controlled rotary table. A roller is toothed onto the guide rail, and the roller is fixedly connected to the output end of an electronically controlled drive device, which is fixed to the connecting rod.

[0015] Furthermore, the guide rail is composed of concentric arc-shaped toothed rails and arc-shaped pressure rails, spaced a certain distance apart. The centers of the arc-shaped toothed rails and the arc-shaped pressure rails are both located at the axis of the rotating shaft, and their fixed end faces are connected and closed by a connecting sealing plate.

[0016] The inner surface of the arc-shaped toothed rail is provided with a toothed strip along the arc surface, and the inner wall of the arc-shaped pressure rail is provided with a polytetrafluoroethylene layer. The roller is provided with a first toothed groove at a position corresponding to the toothed strip, and a first gear tooth is provided in the first toothed groove. The roller is inserted between the arc-shaped toothed rail and the arc-shaped pressure rail, with one end slidingly connected to the inner surface of the arc-shaped pressure rail, and the other end allowing the toothed strip to be inserted into the first toothed groove and mesh with the first gear tooth.

[0017] Furthermore, the electrically controlled drive device is equipped with a roller locking mechanism, which includes at least two pressure plates arranged around the roller. Each pressure plate has a second toothed belt and an outwardly protruding positioning block on its side facing the roller. The side of each pressure plate facing away from the roller is fixed to the telescopic end of an electrically controlled telescopic mechanism. The roller has second teeth along its axle surface at positions corresponding to the second toothed belt, and a slot corresponding to the positioning block at positions corresponding to the positioning block.

[0018] The positioning block has a first rubber layer on the side facing the slot, and the bottom of the slot is fitted with a second rubber layer.

[0019] Furthermore, the connection platform includes a second microcontroller, whose signal output terminal is connected to the control signal input terminal of the electrically controlled rotary table and the control signal input terminal of the electrically controlled drive device, respectively. The signal input terminal of the second microcontroller is also connected to the signal output terminal of the camera.

[0020] Furthermore, the connection platform includes a signal receiving module. This module connects to the remote control via a wired or wireless network; the remote control is either separately installed or added to the control unit.

[0021] Furthermore, a level is fixed to the top surface of the connecting platform.

[0022] The signal connection described in this invention is either a signal line connection or a wireless network connection.

[0023] The present invention provides power supply devices such as built-in power supply components or external power connection cables and power plugs to power electrical equipment.

[0024] The camera described in this invention is an existing video camera, and the improvements involved are all external structural improvements.

[0025] The electrically controlled winch described in this invention can be, as needed, a KDJ miniature winch.

[0026] The electrically controlled lifting platform described in this invention can be, as needed, an HB-DJ803 electric push rod.

[0027] The electronic gyroscope described in this invention can be, as needed, an L3GD20TR three-axis digital gyroscope sensor.

[0028] The electrically controlled rotary table described in this invention can be, as needed, an RSA100 electrically controlled rotary table.

[0029] The electronically controlled drive device described in this invention may be an ST35 stepper motor, depending on the requirements.

[0030] The electrically controlled telescopic mechanism described in this invention can be, as needed, an HB-DJ822 electric push rod.

[0031] The signal receiving module of the present invention may be, as needed, a USB port, an RS485 signal line port, a Bluetooth module, a WIFI module, a 4G network module, a 5G network module, or other ports or modules that can realize communication functions.

[0032] The level described in this invention can be, as needed, a MAVI universal bubble level.

[0033] This invention has at least one of the following advantages:

[0034] This invention can make the camera lens and the LED screen as close to perpendicular as possible during the debugging process, and the results of each debugging are close with minimal error. Therefore, the three rotation components, Pitch, Yaw, and Roll, can all be approximately equal to 0 without affecting the output virtual scene effect.

[0035] This invention can achieve automatic leveling and automatic / semi-automatic calibration during the debugging phase, thereby significantly reducing human error caused by manual operation and further improving the presentation effect of virtual scenes. Attached Figure Description

[0036] Figure 1 The diagram shown is a structural schematic of the device of the present invention;

[0037] Figure 2 The diagram shown is a schematic representation of the plane mirror and plumb bob used for aiming in this invention.

[0038] Figure 3 The diagram shown is a schematic representation of the aiming process of this invention.

[0039] Figure 4 The diagram shown is a structural schematic of the connecting platform and angle adjustment device of the present invention.

[0040] Figure 5 The diagram shown is a schematic diagram of the connection structure between the guide rail and the roller of the present invention;

[0041] Figure 6 The diagram shown is a schematic diagram of the structure of the first tooth groove on the roller of the present invention;

[0042] Figure 7The diagram shown is an installation schematic of the roller locking mechanism of the present invention.

[0043] Figure 8 The diagram shown is a schematic representation of the roller locking mechanism of the present invention. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of the invention.

[0045] Example 1

[0046] A method for aligning a camera with an LED screen, such as Figures 1 to 4 As shown, it includes a plane mirror 1 for aiming, which is set in front of the LED screen 9, and a camera 3 that needs to be aligned with the LED screen.

[0047] The aiming plane mirror 1 is equipped with a first crosshair 104. Two sets of traction ropes 101 are fixed to two points on the top of the aiming plane mirror 1 at the same distance from its center. A plumb line 201 of the same length is fixed to each of the two sets of traction ropes 101 at the same distance from the fixed point. A plumb bob 2 of the same size is fixed to the bottom end of each of the two plumb lines 201.

[0048] The camera 3 has a transparent plate 12 hanging in front of its lens, and the transparent plate 12 has a second crosshair at the center point of the camera 3's lens.

[0049] The camera 3 is fixed on the tripod 13 via the connecting platform 4, and the signal output end of the camera 3 is connected to the controller 5 with a display screen via a signal cable or wireless network.

[0050] At this point, when the staff performs vertical correction of the camera relative to the LED screen, they first wind up the traction rope 101, causing the aiming plane mirror 1 to suspend in front of the LED screen 9. Then, by appropriately winding up the traction rope 101, they adjust the plumb line 201 and the plumb bob 2, so that the plumb line 201 is taut under the natural downward force of the plumb bob 2, and the plumb bob 2 just lightly touches the bottom surface of the LED screen 9. The bottom surface of the LED screen 9 may be a stage surface, a ground surface, an exhibition hall floor, etc., depending on the needs. At this time, the aiming plane mirror 1 is in front of the LED screen. Generally, the fixed position and length of the plumb line 201 should be such that when the plumb bob 2 lightly touches the bottom surface of the LED screen 9, the aiming plane mirror 1 is suspended in front of the center position of the LED screen 9.

[0051] Due to the requirements of virtual scene technology, LED screens 9 are generally set vertically (relative to the horizontal plane, but not necessarily completely perpendicular to the bottom surface of the LED screen 9) to ensure the display effect of the virtual scene. Therefore, with the setting of this invention, the aiming plane mirror 1 can also be almost completely vertical, that is, the aiming plane mirror 1 is approximately completely parallel to the LED screen 9. Therefore, when the camera 3 is vertically aimed at the aiming plane mirror 1, it can also be considered that the camera 3 is vertically aimed at the LED screen 9.

[0052] At this point, by adjusting the tripod 13 and the connecting platform 4, the reflection 11 of the aiming plane mirror 1 and the lens of the camera 3 located in the aiming plane mirror 1, as well as the reflection 1101 of the second crosshair, are observed on the display screen of the control unit 5. Then, by adjusting the tripod 13 and the connecting platform 4, the operator ensures that the reflection 1101 of the second crosshair on the display screen of the control unit 5 coincides with the first crosshair 104, at which point the lens of the camera 3 is almost perpendicular to the aiming plane mirror 1.

[0053] Finally, removing the aiming plane mirror 1, traction rope 101, plumb line 201, plumb bob 2, and transparent plate 12 completes the calibration of camera 3. Since the calibration process uses a plumb line to correct the position of the aiming plane mirror 1, and uses the reflection 1101 of the second crosshair and the first crosshair 104 to correct the perpendicular relationship between the camera 3 lens and the aiming plane mirror 1, the calibration process does not involve subjective judgment factors. Therefore, it is possible to maximize the perpendicularity between the camera lens and the LED screen during the debugging process, and the results of each debugging are close with minimal error. Thus, the three rotation components (Pitch, Yaw, Roll) can be approximately equal to 0 without affecting the output virtual scene effect.

[0054] Example 2

[0055] Based on the method for aligning a camera with an LED screen described in Embodiment 1, such as Figure 2 As shown, the traction rope 101, after its direction is adjusted by a pulley block 102, is fixed to the drum of the electrically controlled winch 103. The electrically controlled winch 103 enables electrically controlled winding and unwinding of the traction rope 101, thereby adjusting the position and deflection angle of the aiming plane mirror 1 via electric control. Compared to manual adjustment, electric control offers higher precision, and the position of the traction rope 101 can be fixed after adjustment due to the winch's locking mechanism or motor resistance, eliminating the need for additional positioning / locking mechanisms (such as nails, hooks, etc.). Depending on the needs, the control terminal of the electrically controlled winch 103 can be connected to the control unit 5 via a signal, or be a push-button switch on the winch housing, or a separately configured remote control.

[0056] Example 3

[0057] Based on the method for aligning a camera with an LED screen described in Embodiment 1, such as Figure 4 As shown, the connecting platform 4 includes a lower base 401 and an upper base 402. The bottom of the lower base 401 is fixed to the top of the tripod 13. The lower base 401 houses a first microcontroller 4012 and 3, 4, 6, or other designed number of electrically controlled lifting mechanisms 4011. The signal output terminal of the first microcontroller 4012 is connected to the control signal input terminals of the 3, 4, 6, or other designed number of electrically controlled lifting mechanisms 4011. The 3, 4, 6, or other designed number of electrically controlled lifting mechanisms 4011 are arranged in a matrix, and the lifting ends of the electrically controlled lifting mechanisms 4011 extend to the outer top of the lower base 401 and are fixed to the bottom of the upper base 402. The upper base 402 houses an electronic gyroscope 4021, and the signal output terminal of the electronic gyroscope 4021 is connected to the signal input terminal of the first microcontroller 4012.

[0058] At this time, the electronic gyroscope 4021 sends the horizontal position of the upper base 402 to the first microcontroller 4012 in real time. The first microcontroller 4012 controls the lifting ends of each electric lifting platform 4011 to perform lifting, lowering and maintaining actions according to the pre-stored program, so that the upper base 402 is kept in a nearly horizontal direction. This allows the connecting platform 4 and the camera 3 to ignore the terrain undulations or slope changes of the installation position and remain in an almost completely horizontal direction, which significantly reduces the difficulty of subsequent work in correcting the perpendicularity of the camera 3 to the LED screen 9.

[0059] Example 4

[0060] Based on the method for aligning a camera with an LED screen described in either Embodiment 1 or 3, such as Figure 4 As shown, the connecting platform 4 includes an electrically controlled rotary table 403. The camera 3 is mounted on the rotating end of the electrically controlled rotary table 403. The fixed end of the electrically controlled rotary table 403 is fixed to the top of the tripod 13 (when the lower base 401 and upper base 402 are not provided) or fixed to the top of the upper base 402.

[0061] Compared to direct manual rotation or placement adjustment, adjusting the horizontal orientation of the camera 3 via the electronically controlled rotary table 403 can achieve relatively stable adjustment and control.

[0062] Example 5

[0063] Based on the method for aligning a camera with an LED screen described in Embodiment 4, such as Figure 4As shown, the camera 3 is mounted on the rotating end of the electrically controlled rotary table 403 via an angle adjustment device. The angle adjustment device includes a rotating base 404 fixed to the rotating end of the electrically controlled rotary table 403, and the outer wall of the camera 3 is rotatably mounted on the rotating base 404 via a rotating shaft 405. A connecting rod 406 is fixed to the back of the lens of the camera 3. A guide rail 407 is provided vertically on one side of the connecting rod 406, and the bottom of the guide rail 407 is fixed to the rotating end of the electrically controlled rotary table 403. A roller 408 is toothed onto the guide rail 407, and the roller 408 is fixedly connected to the output end of an electrically controlled drive device 409, which is fixed to the connecting rod 406.

[0064] At this time, the roller 408 is driven to rotate by the electronically controlled drive device 409, so that the roller 408 slides up and down along the guide rail 407, and then drives the camera 3 to rotate up and down along the rotation axis 405 through the connecting rod 406, thereby adjusting the lens orientation of the camera 3.

[0065] Example 6

[0066] Based on the method for aligning a camera with an LED screen described in Embodiment 5, such as Figure 4 and Figure 5 As shown, the guide rail 407 is composed of concentric arc-shaped toothed rails 4071 and arc-shaped pressure rails 4072, which are spaced a certain distance apart. The centers of the arc-shaped toothed rails 4071 and the arc-shaped pressure rails 4072 are both located at the axis of the rotating shaft 405, and their fixed end faces are connected and closed by a connecting sealing plate 4074.

[0067] The inner surface of the arc-shaped toothed rail 4071 is provided with a first toothed band 4073 along the arc surface, and the inner wall of the arc-shaped pressure rail 4072 is provided with a polytetrafluoroethylene layer. The roller 408 is provided with a first toothed groove 4085 at a position corresponding to the first toothed band 4073, and a first gear tooth 4086 is provided in the first toothed groove 4085. The roller 408 is inserted between the arc-shaped toothed rail 4071 and the arc-shaped pressure rail 4072, with one end slidingly connected to the inner surface of the arc-shaped pressure rail 4072, and the other end allowing the first toothed band 4073 to be inserted into the first toothed groove 4085, and the first toothed band 4073 to mesh with the first gear tooth 4086.

[0068] At this time, when the roller 408 is driven to rotate by the electronically controlled drive device 409, the roller 408 moves up and down along the first toothed belt 4073 through the toothed relationship between the first gear tooth 4086 and the first toothed belt 4073. At this time, the arc-shaped pressure rail 4072 acts as a pressure limiter for the roller 408, so that the roller 408 maintains the toothed relationship with the first toothed belt 4073 during the displacement process. Although the roller 408 rotates in the opposite direction to the arc-shaped pressure rail 4072, the inner wall of the arc-shaped pressure rail 4072 is provided with a polytetrafluoroethylene layer, which can significantly reduce the coefficient of friction between the roller 408 and the arc-shaped pressure rail 4072, thereby significantly reducing the frictional force between the roller 408 and the arc-shaped pressure rail 4072. Therefore, even if the roller 408 rotates in the opposite direction to the arc-shaped pressure rail 4072, it will not hinder the up and down displacement of the roller 408 along the first toothed belt 4073.

[0069] Example 7

[0070] Based on the method for aligning a camera with an LED screen described in Embodiment 5, such as Figure 6 As shown, the electrically controlled drive device 409 is equipped with a roller locking mechanism, which includes two, three, four, or other designed number of pressure plates 8 arranged around the roller 408. Each pressure plate 8 has a second toothed belt 801 and an outwardly protruding positioning block 802 on its side facing the roller 408. The side of each pressure plate 8 facing away from the roller 408 is fixed to the telescopic end of an electrically controlled telescopic mechanism 7. The roller 408 has second teeth 4084 that mesh with the second toothed belt 801 at positions corresponding to the second toothed belt 801 along its axial surface, and has slots 4082 corresponding to the positioning blocks 802 at positions corresponding to the positioning blocks 802.

[0071] The positioning block 802 has a first rubber layer 803 on the side facing the slot 4082, and the bottom of the slot 4082 is fitted with a second rubber layer 4083.

[0072] At this time, when it is necessary to control the rotation of the roller 408, the telescopic end of the electric telescopic mechanism 7 is first retracted, causing the second toothed belt 801 of the pressure plate 8 to separate from the second wheel tooth 4084, and the first rubber layer 803 of the positioning block 802 to separate from the second rubber layer 4083 of the slot 4082. This allows the electric drive device 409 to be started, driving the roller 408 to rotate. Simultaneously, when the electric drive device 409 stops, the telescopic end of the electric telescopic mechanism 7 is extended, causing the second toothed belt 801 to engage with the second wheel tooth 4084, and the first rubber layer 803 to press and rub against the second rubber layer 4083, thus limiting the rotation of the roller 408 under external force and fixing the lens orientation of the camera 3. The control terminal of the electric telescopic mechanism 7 can be connected to the same controller as the control terminal of the electric drive device 409 for synchronous control, or connected to the control terminal of the electric drive device 409 to perform synchronous corresponding actions based on the control signals received by the control terminal of the electric drive device 409.

[0073] This setting is mainly for situations where the slope of the bottom surface exceeds the adjustment capability of the horizontal adjustment mechanism built into the camera 3 or the horizontal adjustment capability between the lower base 401 and the upper base 402 of the connecting platform 4. In this case, the camera 3 lens can be tilted in the vertical direction so that the camera 3 lens can be perpendicular to the LED screen 9.

[0074] Example 8

[0075] Based on the method for aligning a camera with an LED screen described in Embodiment 5, such as Figure 6 As shown, the connection platform 4 is equipped with a second microcontroller 4022. The signal output terminal of the second microcontroller 4022 is connected to the control signal input terminal of the electrically controlled rotary table 403 and the control signal input terminal of the electrically controlled drive device 409, respectively. The signal input terminal of the second microcontroller 4022 is connected to the signal output terminal of the camera 3. This configuration allows the second microcontroller 4022 to receive the image signal from the camera 3 and control the electrically controlled rotary table 403 and the electrically controlled drive device 409 accordingly, positioning the lens of the camera 3 perpendicular to the LED screen 9. The connection platform 4 is also equipped with a signal receiving module 4023. The signal receiving module 4023 is connected to the remote controller 6 via a wired or wireless network. The remote controller 6 is either separately installed or added to the control unit 5. Through the added signal receiving module 4023, the second microcontroller 4022 can receive the control signals from the remote controller 6 and control the electrically controlled rotary table 403 and the electrically controlled drive device 409 to perform corresponding actions based on the control signals from the remote controller 6.

[0076] According to one embodiment of the present invention, such as Figure 4As shown, a level is fixed to the top surface of the connecting platform 4. This setting allows the operator to adjust the tripod 13 according to the level, thereby ensuring that the camera 3 is in a level position, which is beneficial for subsequent adjustment work.

[0077] It should be noted and understood that various modifications and improvements can be made to the invention described in the above detailed description without departing from the spirit and scope of the claims. Therefore, the scope of the claimed solutions is not limited to any specific exemplary teachings given.

Claims

1. A method for aligning a camera with an LED screen, characterized in that, include: S1. A plane mirror (1) for aiming and a camera (3) that needs to be aligned with the LED screen (9) are set in front of the LED screen (9); the plane mirror (1) for aiming is provided with a first crosshair (104); two sets of traction ropes (101) are fixed at two fixed points on the left and right at the same position from the center of the plane mirror (1); two sets of traction ropes (101) of the same length are fixed at the same position from the fixed points on the two sets of traction ropes (101); a plumb line (201) of the same length is fixed on the two sets of traction ropes (101); a plumb line (201) of the same size is fixed at the bottom of the two plumb lines (201); a transparent plate (12) is hung in front of the lens of the camera (3); a second crosshair is provided at the center point of the lens of the camera (3) on the transparent plate (12); the camera (3) is fixed on the tripod (13) through the connecting platform (4); the signal output end of the camera (3) is connected to the control machine (5) with a display screen through a signal line or wireless network. S2. First, wind up the traction rope (101) so that the aiming plane mirror (1) is suspended in front of the LED screen (9); then, by winding up the traction rope (101) appropriately, adjust the plumb line (201) and the plumb bob (2) so that the plumb line (201) is taut under the natural downward force of the plumb bob (2) and the plumb bob (2) just lightly touches the bottom surface of the LED screen (9); S3. Adjust the tripod (13) and the connecting platform (4) until the reflection (11) of the aiming plane mirror (1) and the lens of the camera (3) located in the aiming plane mirror (1) and the reflection (1101) of the second crosshair are observed in the display screen of the control unit (5). S4. By adjusting the tripod (13) and the connecting platform (4), the reflection (1101) of the second crosshair in the display screen of the control unit (5) is made to coincide with the first crosshair (104), at which time the lens of the camera (3) is almost perpendicular to the aiming plane mirror (1). S5. Remove the aiming plane mirror (1), traction rope (101), plumb line (201), plumb (2), and transparent plate (12) to complete the operation of aligning the camera (3) with the LED screen (9); The connection platform (4) includes: an electrically controlled rotary table (403); the camera (3) is mounted on the rotating end of the electrically controlled rotary table (403); The camera (3) is mounted on the rotating end of the electronically controlled rotary table (403) via an angle adjustment device. The angle adjustment device includes a rotating base (404) fixed on the rotating end of the electronically controlled rotary table (403). The outer wall of the camera (3) is rotatably mounted on the rotating base (404) via a rotating shaft (405). The camera (3) has a connecting rod (406) fixed on the back side of the lens. A guide rail (407) is provided on one side of the connecting rod (406) in the vertical direction. The bottom of the guide rail (407) is fixed on the rotating end of the electronically controlled rotary table (403). A roller (408) is toothed on the guide rail (407). The roller (408) is fixedly connected to the output end of the electronically controlled drive device (409). The electronically controlled drive device (409) is fixed on the connecting rod (406). The electrically controlled drive device (409) is provided with a roller locking mechanism, which includes: at least two pressure plates (8) arranged around the roller (408); each pressure plate (8) is provided with a second toothed belt (801) and an outwardly protruding positioning block (802) on the side facing the roller (408); each pressure plate (8) is fixed to the telescopic end of an electrically controlled telescopic machine (7) on the side facing away from the roller (408); the roller (408) is provided with a second tooth (4084) that meshes with the second toothed belt (801) at a position corresponding to the second toothed belt (801) along the axial surface wheel, and is provided with a slot (4082) that corresponds to the positioning block (802) at a position corresponding to the positioning block (802). The positioning block (802) has a first rubber layer (803) on the side facing the slot (4082), and the bottom of the slot (4082) is fitted with a second rubber layer (4083).

2. The method for aligning a camera with an LED screen according to claim 1, characterized in that, The traction rope (101) is adjusted in direction by a certain pulley group (102) and then fixed to the drum of the electric winch (103).

3. The method for aligning a camera with an LED screen according to claim 1, characterized in that, The connecting platform (4) includes: a lower base (401) and an upper base (402); the bottom of the lower base (401) is fixed to the top of the tripod (13); the lower base (401) is provided with a first microcontroller (4012) and at least 3 electrically controlled lifts (4011), the signal output terminal of the first microcontroller (4012) is connected to the control signal input terminal of the electrically controlled lift (4011); the lifting end of the electrically controlled lift (4011) extends to the outer side of the top of the lower base (401) and is fixed to the bottom of the upper base (402); the upper base (402) is provided with an electronic gyroscope (4021), the signal output terminal of the electronic gyroscope (4021) is connected to the signal input terminal of the first microcontroller (4012).

4. The method for aligning a camera with an LED screen according to claim 1, characterized in that, The guide rail (407) is composed of concentric arc-shaped toothed rails (4071) and arc-shaped pressure rails (4072) spaced a certain distance apart; the centers of the arc-shaped toothed rails (4071) and the arc-shaped pressure rails (4072) are both located at the center of the rotating shaft (405), and their fixed end faces are connected and closed by a connecting sealing plate (4074); The inner side of the arc-shaped toothed rail (4071) is provided with a first toothed belt (4073) along the arc surface, and the inner wall of the arc-shaped pressure rail (4072) is provided with a polytetrafluoroethylene layer; the roller (408) is provided with a first toothed groove (4085) at a position corresponding to the first toothed belt (4073), and a first gear tooth (4086) is provided in the first toothed groove (4085); the roller (408) is inserted between the arc-shaped toothed rail (4071) and the arc-shaped pressure rail (4072), one end of which is in a sliding connection with the inner side of the arc-shaped pressure rail (4072), and the other end allows the first toothed belt (4073) to be inserted into the first toothed groove (4085), and the first toothed belt (4073) to mesh with the first gear tooth (4086).

5. The method for aligning a camera with an LED screen according to claim 1, characterized in that, The connection platform (4) is equipped with a second microcontroller (4022). The signal output terminal of the second microcontroller (4022) is connected to the control signal input terminal of the electric rotary table (403) and the control signal input terminal of the electric drive device (409), respectively. The signal input terminal of the second microcontroller (4022) is connected to the signal output terminal of the camera (3).

6. The method for aligning a camera with an LED screen according to claim 5, characterized in that, The connection platform (4) is equipped with a signal receiving module (4023); the signal receiving module (4023) is connected to the remote controller (6) via a wired or wireless network, and the remote controller (6) is set up separately or added to the controller (5).

7. The method for aligning a camera with an LED screen according to claim 1, characterized in that, A level (410) is fixed on the top surface of the connecting platform (4).

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