Calibration device for event camera

Abstract

The invention relates to the technical field of event cameras, in particular to an event camera calibration device which comprises an event camera arranged in a shell. The protection air bag is connected to the outer wall of a shell of the event camera, the protection air bag is formed by splicing a plurality of air bags, a pull rope is fixedly connected to the exterior of the protection air bag, a balancing weight is fixedly connected to the end, away from the protection air bag, of the pull rope, and a connecting rod is fixedly connected to one side of the balancing weight; the end, away from the balancing weight, of the connecting rod is fixedly connected with a metal anchor. When the device falls into water, the device can float on the water surface, meanwhile, the device can be prevented from floating too far away from a falling point along with water flow, a user can find the device conveniently, when an event camera falls into water, the protection air bag can expand rapidly at the moment, and the protection air bag formed by splicing the multiple air bags can be unfolded, so that the user can find the event camera conveniently. At the moment, it is ensured that the event camera floats on the water surface, and the phenomenon that internal receipt data are damaged is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of event cameras, and in particular to a calibration device for event cameras. Background Art

[0002] The working principle of the event camera calibration device is based on the camera calibration technology, that is, by obtaining the image data of the calibration object at multiple positions, the image processing algorithm and mathematical model are used to solve the parameters of the camera imaging geometric model. The core of the event camera is its response mechanism to light changes. The perception of brightness changes between the pixels inside the camera is independent of each other. When the light intensity change detected by a pixel exceeds the preset threshold, a signal called "event" is generated. This event contains four basic information: the position of the pixel (x, y), the timestamp (t), and the type of brightness change (increase or decrease). Therefore, the output of the event camera is not an intensity image, but an asynchronous event stream (microsecond level), each event consists of its time and space coordinates and a sign of the event occurrence (not intensity).

[0003] Event camera calibration devices will be used for navigation and obstacle avoidance of autonomous vehicles and drones in complex environments. They require fast and accurate processing of large amounts of dynamic information, and event cameras provide an efficient solution.

[0004] During drone data collection, there is a possibility that the drone may fall. Due to the complex geographical environment, if a drone falls into the river, the event camera and the drone will sink directly to the bottom of the river. It is difficult to salvage them in the flowing river. During the sinking process, they may move a certain distance with the river and cannot be quickly located for salvage operations. For example, the patent with authorization announcement number CN117911540B discloses a device and method for event camera calibration, which can realize the rotation drive control of the lower shaft frame and the upper shaft frame with mutually perpendicular rotation directions, which is conducive to reducing the number of servo motors used in the rotating table, thereby effectively reducing the manufacturing cost of the rotating table, and is conducive to more convenient and accurate calibration of the event camera. However, most of the components in the above technical solution are metal components, which will sink to the bottom when falling into the water. Especially when collecting data in unknown waters, falling into the water will cause great trouble for salvage. Summary of the invention

[0005] In response to the problems in the prior art, the present invention provides a device for calibrating an event camera, which can float the device on the water surface when the device falls into the water, and can also prevent the device from drifting too far away from the falling point with the water flow, which is convenient for users to find. When the event camera falls into the water, the protective airbag will expand rapidly and the protective airbag spliced ​​by multiple airbags will unfold, which will ensure that the event camera floats on the water surface and prevent the internal receipt data from being damaged. Under the impact of the water flow, the metal anchor will contact and anchor at the bottom of the water, and the protective airbag will be pulled by a pull rope to prevent the protective airbag from moving with the water flow, which is convenient for staff to find.

[0006] The technical solution adopted by the present invention to solve the technical problem is: a device for calibrating an event camera, comprising an event camera, wherein the event camera is placed in a housing;

[0007] A protective airbag is connected to the outer wall of the shell of the event camera, and the protective airbag is composed of multiple airbags.

[0008] A drawstring is fixedly connected to the outside of the protective airbag, one end of the drawstring away from the protective airbag is fixedly connected to a counterweight block, and one side of the counterweight block is fixedly connected to a connecting rod;

[0009] One end of the connecting rod away from the counterweight is fixedly connected with a metal anchor.

[0010] Specifically, a limit plate is arranged at the counterweight block away from the connecting rod end, the limit plate and the counterweight block are integrally formed, and the angle between the limit plate and the counterweight block is set between 90° and 120°, and a barb is fixedly connected to the side of the limit plate close to the counterweight block, and the angle between the barb and the limit plate is set between 45° and 80°.

[0011] Specifically, a storage slot is provided on the top of the event camera, a metal anchor is placed in the storage slot, an inner protrusion block is fixedly provided at the bottom of the storage slot, a cover plate is rotatably provided at the top of the storage slot, and the metal anchor is limited between the inner protrusion block and the cover plate through the cover plate.

[0012] Specifically, an inner limiting groove is fixedly provided on one side of the inner protruding block close to the metal anchor, a stop column is rotatably arranged in the inner limiting groove, and a making way groove for making way for the stop column is arranged on one side of the inner limiting groove.

[0013] Specifically, an electric control push rod is connected to the inner limit groove through a rotating rod, the electric control push rod is rotatably connected to the bottom of the blocking column, and a lifting spring is fixedly connected to the inner limit groove, and the lifting spring is tightly pressed against the metal anchor.

[0014] Specifically, a trigger component is fixedly connected to one side of the event camera. The trigger component includes a connection shell which is fixedly connected to the outer wall of the event camera housing. A sliding rod is slidably arranged inside the connection shell, and both ends of the sliding rod are placed outside the connection shell. A cross bar is fixedly connected to one end of the sliding rod close to the cover plate, and a pressing plate is fixedly connected to one side of the cross bar close to the cover plate. The pressing plate is arranged in cooperation with the cover plate.

[0015] Specifically, a side hole is opened in the middle of the connection shell, a side connection groove is arranged on the side wall of the sliding rod, connection teeth are arranged on the inner wall of the side connection groove, a driving motor is fixedly connected to the side wall of the event camera, and a half gear is fixedly connected to the output end of the driving motor. The half gear can be engaged with the connection teeth.

[0016] Specifically, a hollow rod is fixedly connected to one end of the sliding rod far from the cross bar, a hollow buoyancy ball is fixedly connected to the bottom of the hollow rod, and the hollow buoyancy ball is communicated with the hollow rod.

[0017] Specifically, the event camera is connected to the drone through a calibration component. The calibration component includes a fixed connection frame which is fixedly connected to the bottom of the drone through bolts. A first adjustment motor is connected to the bottom of the fixed connection frame, and an installation frame is fixedly connected to the rotating end of the first adjustment motor.

[0018] Specifically, a second adjustment motor is fixedly connected to the bottom of one end of the installation frame far from the first adjustment motor. The output end of the second adjustment motor is fixedly connected to a rotating frame which is arranged in a "C" shape. The end of the rotating frame is placed on both sides of the event camera, and the side close to the event camera is connected to the event camera through a third adjustment motor.

[0019] Advantages of the present invention:

[0020] (1) For the calibration device for the event camera described in the present invention, compared with the prior art, when the device falls into the water, the device can be floated on the water surface, and at the same time, the device can be prevented from floating too far away from the falling point along with the water flow, which is beneficial for the user to search. When the event camera falls into the water, the protection airbag at this time will quickly expand, and the protection airbag spliced by multiple airbags will unfold. At this time, it is ensured that the event camera floats on the water surface to avoid damage to the internal receipt data. Under the impact of the water flow, the metal anchor will contact the bottom of the water and anchor at the bottom of the water, and the protection airbag will be pulled by the pull rope to prevent the protection airbag from moving along with the water flow all the time, which is convenient for the staff to search. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below with reference to the drawings and embodiments.

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

[0023] Figure 2 It is a three-dimensional structure schematic diagram of the calibration component of the present invention;

[0024] Figure 3 For the present invention Figure 2 Enlarged view of point A in the middle;

[0025] Figure 4 It is a schematic diagram of the three-dimensional structure of the trigger component of the present invention;

[0026] Figure 5 This is a connection diagram of the metal anchor and the connecting rod of the present invention;

[0027] Figure 6 This is a connection diagram of the hollow rod and the hollow buoyancy ball of the present invention;

[0028] Figure 7 For the present invention Figure 6 Exploded diagram of

[0029] Figure 8 For the present invention Figure 7 Schematic diagram of the structure at B;

[0030] Fig. 9 It is a schematic diagram of the internal structure of the protruding block of the present invention.

[0031] In the figure: 1, drone; 2, calibration component; 21, fixed connection frame; 22, first adjustment motor; 23, mounting frame; 24, second adjustment motor; 25, rotating frame; 26, third adjustment motor;

[0032] 3. Event camera; 31. Storage slot; 32. Inner protrusion; 321. Inner limit slot; 322. Lifting spring; 323. Electric push rod; 324. Giving slot; 325. Stop column; 326. Rotating rod; 30. Cover plate;

[0033] 4. trigger assembly; 41. connecting shell; 411. side hole; 42. sliding rod; 421. side connecting groove; 422. connecting tooth; 43. hollow rod; 44. hollow buoyancy ball; 45. driving motor; 451. half gear; 46. cross bar; 47. pressing plate;

[0034] 5. Protective airbag; 6. Metal anchor; 61. Connecting rod; 62. Counterweight; 621. Limiting plate; 622. Barb; 66. Pull rope. DETAILED DESCRIPTION

[0035] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0036] like Figure 1-Figure 9 As shown, a device for calibrating an event camera of the present invention comprises an event camera 3, and the event camera 3 is placed in a housing;

[0037] The protective airbag 5 is connected to the outer wall of the shell of the event camera 3, and the protective airbag 5 is composed of multiple airbags.

[0038] The protection airbag 5 is externally fixedly connected with a drawstring 66, one end of the drawstring 66 away from the protection airbag 5 is fixedly connected with a counterweight 62, and one side of the counterweight 62 is fixedly connected with a connecting rod 61;

[0039] One end of the connecting rod 61 away from the counterweight 62 is fixedly connected to a metal anchor 6 .

[0040] When the event camera 3 falls into the water, the protection airbag 5 will expand rapidly, and the protection airbag 5 composed of multiple airbags will unfold, ensuring that the event camera 3 floats on the water surface to avoid damage to the internal collected data. After the protection airbag 5 collides, the metal anchor 6 will enter the water. The metal anchor 6, the connecting rod 61 and the counterweight block 62 are all made of metal and can sink to the bottom quickly. Under the impact of the water flow, the metal anchor 6 will contact the bottom of the water and anchor at the bottom of the water. The protection airbag 5 is pulled by the pull rope 66 to prevent the protection airbag 5 from moving with the water flow, which is convenient for the staff to find. The connection position of the pull rope 66 is on the back of the event camera 3. Under the rapid impact of the water flow and the pulling of the pull rope 66, the event camera 3 can be placed above the protection airbag 5, that is, above the water surface, to protect the event camera 3.

[0041] Specifically, a limiting plate 621 is provided at the end of the counterweight block 62 away from the connecting rod 61. The limiting plate 621 and the counterweight block 62 are integrally formed, and the angle between the limiting plate 621 and the counterweight block 62 is set between 90° and 120°. A barb 622 is fixedly connected to the limiting plate 621 on the side close to the counterweight block 62, and the angle between the barb 622 and the limiting plate 621 is set between 45° and 80°.

[0042] The counterweight block 62 can speed up the sinking of the metal anchor 6, wherein the limit plate 621 and the counterweight block 62 are integrally formed in an "L" shape. When the metal anchor 6 cannot anchor to the bottom of the water area in time, the limit plate 621 will also anchor to the bottom of the water area when sinking. The barb 622 can be set to quickly anchor to the bottom of the water area. The angle between the limit plate 621 and the counterweight block 62 is set to 90°~120°, and the angle between the barb 622 and the limit plate 621 is set to 45°~80°, which can increase the speed of anchoring to the bottom of the water area. Through the cooperation of the counterweight block 62 and the metal anchor 6, the purpose of quickly anchoring to the bottom of the water area is achieved, and the floating distance of the protective airbag 5 above is avoided to be too far, which is conducive to the rapid search for the event camera 3.

[0043] The limiting plate 621 and the counterweight block 62 are integrally formed in an "L" shape. In normal working state, it can limit the protective airbag 5 placed on the event camera 3 to ensure that the protective airbag 5 can fit with the outer wall of the event camera 3 when not in use.

[0044] Specifically, a storage groove 31 is provided on the top of the event camera 3, and the metal anchor 6 is placed in the storage groove 31. An inner protrusion block 32 is fixedly provided at the bottom of the storage groove 31, and a cover plate 30 is rotatably provided on the top of the storage groove 31. The metal anchor 6 is limited between the inner protrusion block 32 and the cover plate 30 through the cover plate 30.

[0045] When the event camera 3 is working normally, the metal anchor 6 is stored in the storage slot 31, and the metal anchor 6 is limited by the cover plate 30 and the inner protruding block 32 to prevent the metal anchor 6 from falling off and affecting it when not in use. The cover plate 30 can rotate with the outer casing of the event camera 3, and the metal anchor 6 can fall out of the storage slot 31 when the cover plate 30 rotates.

[0046] Specifically, an inner limiting groove 321 is fixedly opened on one side of the inner protruding block 32 close to the metal anchor 6 , a stopper 325 is rotatably arranged in the inner limiting groove 321 , and a making way groove 324 for making way for the stopper 325 is arranged on one side of the inner limiting groove 321 .

[0047] The blocking column 325 can block the metal anchor 6 to prevent the metal anchor 6 from falling when not in use. The inner limit groove 321 plays an installation role. When one end of the blocking column 325 rotates into the give way groove 324, the metal anchor 6 can slide between the two inner protruding blocks 32. The setting of the blocking column 325 can ensure that the metal anchor 6 can be fixed when it is not needed to ensure that it will not shake.

[0048] Specifically, the inner limit groove 321 is connected to an electric control push rod 323 through a rotating rod 326, and the electric control push rod 323 is rotatably connected to the bottom of the blocking column 325. A lifting spring 322 is fixedly connected inside the inner limit groove 321, and the lifting spring 322 is tightly pressed against the metal anchor 6.

[0049] When the metal anchor 6 needs to be pushed out of the receiving groove 31, the cover plate 30 placed above the metal anchor 6 will be loosened. Before that, the telescopic end of the electric control push rod 323 is shortened to pull the bottom of the blocking column 325 to rotate, and the upper end of the blocking column 325 rotates toward the direction of the yielding groove 324. The telescopic end of the electric control push rod 323 rotates along the rotating rod 326 while pulling the bottom of the blocking column 325 to rotate.

[0050] When the cover 30 is loosened, the lifting spring 322 instantly pops up the metal anchor 6, causing it to pop out of the storage groove 31, wherein the lifting spring 322 is in a compressed state before releasing the metal anchor 6, pressing it against the cover 30, further ensuring the stability of the metal anchor 6 when it is not needed.

[0051] Specifically, a trigger component 4 is fixedly connected to one side of the event camera 3, and the trigger component 4 includes a connecting shell 41, and the connecting shell 41 is fixedly connected to the outer wall of the event camera 3 shell. A sliding rod 42 is slidably arranged in the connecting shell 41, and both ends of the sliding rod 42 are placed outside the connecting shell 41. The end of the sliding rod 42 close to the cover plate 30 is fixedly connected to a cross bar 46, and the side of the cross bar 46 close to the cover plate 30 is fixedly connected to a pressure plate 47, and the pressure plate 47 is arranged in cooperation with the cover plate 30.

[0052] The opening time of the cover 30 can be controlled by setting the trigger component 4, wherein the sliding rod 42 can slide along the inner wall of the connecting shell 41, and when the sliding rod 42 slides upward, it will drive the top cross bar 46 to move upward, and at this time the cross bar 46 drives the connected pressure plate 47 to move upward at the same time, and at this time the pressure plate 47 is separated from the cover 30, and the lifting spring 322 instantly lifts the metal anchor 6, thereby releasing the metal anchor 6.

[0053] Specifically, a side hole 411 is opened in the middle of the connecting shell 41, a side connecting groove 421 is provided on the side wall of the sliding rod 42, and a connecting tooth 422 is provided on the inner wall of the side connecting groove 421. The side wall of the event camera 3 is fixedly connected to a driving motor 45, and the output end of the driving motor 45 is fixedly connected to a half gear 451, which can engage with the connecting tooth 422.

[0054] When needed, the metal anchor 6 can be actively released by actively controlling the output end of the driving motor 45 to rotate. During the rotation, the output end of the driving motor 45 drives the half gear 451 to rotate. During the rotation, the toothed side of the half gear 451 will rotate to the side engaged with the connecting tooth 422, and at this time, the sliding rod 42 will be driven to slide along the inner wall of the connecting shell 41 to release the cover plate 30. The contact position between the sliding rod 42 and the inner wall of the connecting shell 41 is roughly arranged, and the maximum static friction between the sliding rod 42 and the connecting shell 41 is greater than the elastic force of the lifting spring 322 in the compressed state, so as to avoid the metal anchor 6 from loosening when there is no need to release the metal anchor 6. The sliding rod 42 can be limited by the engagement of the half gear 451 with the connecting tooth 422 to ensure that the pressure plate 47 and the cover plate 30 are in a tight state.

[0055] Specifically, one end of the sliding rod 42 away from the cross rod 46 is fixedly connected to the hollow rod 43 , and the bottom of the hollow rod 43 is fixedly connected to the hollow buoyancy ball 44 , and the hollow buoyancy ball 44 is arranged to penetrate the hollow rod 43 .

[0056] When the device falls into water and the drive motor 45 is powered off, the buoyancy of the hollow buoyancy ball 44 and the hollow rod 43 is used to push the sliding rod 42 to slide, so that the pressing plate 47 and the cover plate 30 are loosened. The opening of the cover plate 30 at the metal anchor 6 is controlled in various ways, which can ensure the protection of the event camera 3 even without power when falling into water. When the drone 1 loses control and rapidly impacts the ground, if the hollow buoyancy ball 44 contacts and impacts the ground first, it will also be triggered. When the metal anchor 6 becomes loose, it will drive the counterweight 62 to move simultaneously. The counterweight 62 no longer limits the protection airbag 5. At this time, the protection airbag 5 will expand to play a buffering role. (The protection airbag 5 is similar to an automotive airbag and will rapidly expand when the counterweight 62 no longer restricts it or when it is externally impacted, and the gas inside will not remain inside continuously).

[0057] Specifically, the drone 1 and the event camera 3 are connected through a calibration component 2. The calibration component 2 includes a fixed connection frame 21. The fixed connection frame 21 is fixedly connected to the bottom of the drone 1 through bolts. The bottom of the fixed connection frame 21 is connected with a first adjustment motor 22. The rotating end of the first adjustment motor 22 is fixedly connected with a mounting frame 23;

[0058] One end of the mounting frame 23 away from the first adjustment motor 22 is fixedly connected with a second adjustment motor 24 at the bottom. The output end of the second adjustment motor 24 is fixedly connected with a rotating frame 25. The rotating frame 25 is arranged in a "C" shape. The ends of the rotating frame 25 are placed on both sides of the event camera 3, and the side close to the event camera 3 is connected to the event camera 3 through a third adjustment motor 26.

[0059] During the operation of the drone 1 through the calibration component 2, the fixed connection frame 21 in the calibration component 2 is connected to the drone 1. The drone 1 drives the event camera 3 to move to a preset position through the fixed connection frame 21. The setting of the first adjustment motor 22 can drive the mounting frame 23 to rotate 360°, increasing the detection range of the time camera 3. At the same time, the second adjustment motor 24 can drive the rotating frame 25 to rotate. When falling into water, the second adjustment motor 24 will drive the rotating frame 25 to rotate immediately, so that the protection airbag 5 rotates to the lower part of the event camera 3, so as to ensure that the event camera 3 of the device can float on the water surface after falling into water.

[0060] Working principle: When in use, the drone 1 drives the calibration component 2 and the event camera 3 to fly to a preset position.

[0061] When the event camera 3 falls into the water, the output end of the driving motor 45 can be actively controlled to rotate. The output end of the driving motor 45 drives the half gear 451 to rotate during the rotation. The toothed side of the half gear 451 rotates to the side engaged with the connecting tooth 422 during the rotation. At this time, the sliding rod 42 is driven to slide along the inner wall of the connecting shell 41 to loosen the cover plate 30. The metal anchor 6, the connecting rod 61 and the counterweight block 62 are all made of metal and can sink to the bottom quickly. Under the impact of the water flow, the metal anchor 6 will contact the bottom of the water and anchor at the bottom of the water. The protective airbag 5 is pulled by the pull rope 66 to prevent the protective airbag 5 from moving with the water flow, which is convenient for the staff to find.

[0062] If power is lost after entering the water, the buoyancy of the hollow buoyancy ball 44 and the hollow rod 43 pushes the sliding rod 42 to slide, so that the pressure plate 47 and the cover 30 are loosened. The opening of the cover 30 at the metal anchor 6 is controlled in a variety of ways to ensure that the event camera 3 can be protected even if there is no power when falling into the water. When the drone 1 loses control and hits the ground quickly, if the hollow buoyancy ball 44 contacts and hits the ground before, it will also be triggered. When the metal anchor 6 is loosened, it will drive the counterweight block 62 to move at the same time, and the counterweight block 62 will no longer limit the protection airbag 5. At this time, the protection airbag 5 will unfold and play a buffering role.

[0063] When the event camera 3 falls into the water, the protective airbag 5 will expand rapidly, and the protective airbag 5 composed of multiple airbags will unfold, ensuring that the event camera 3 floats on the water surface to avoid damage to the internal collected data, and the metal anchor 6 will enter the water after the protective airbag 5 collides.

[0064] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention. The scope of the present invention is defined by the attached claims and their equivalents.

Claims

1. A device for event camera calibration, characterized in that: It comprises an event camera (3), wherein the event camera (3) is placed in the housing; A protective airbag (5), the protective airbag (5) is connected to the outer wall of the shell of the event camera (3), and the protective airbag (5) is composed of a plurality of airbags spliced ​​together. The protection airbag (5) is fixedly connected to a drawstring (66) on the outside, one end of the drawstring (66) away from the protection airbag (5) is fixedly connected to a counterweight (62), and one side of the counterweight (62) is fixedly connected to a connecting rod (61); One end of the connecting rod (61) away from the counterweight (62) is fixedly connected to a metal anchor (6).

2. The device for event camera calibration according to claim 1, characterized in that: A limiting plate (621) is arranged at the end of the counterweight (62) away from the connecting rod (61); the limiting plate (621) and the counterweight (62) are integrally formed, and an included angle between the limiting plate (621) and the counterweight (62) is set between 90° and 120°; a barb (622) is fixedly connected to a side of the limiting plate (621) close to the counterweight (62); and an included angle between the barb (622) and the limiting plate (621) is set between 45° and 80°.

3. The device for event camera calibration according to claim 1, characterized in that: The event camera (3) is provided with a storage groove (31) at the top, the metal anchor (6) is placed in the storage groove (31), an inner protruding block (32) is fixedly provided at the bottom of the storage groove (31), and a cover plate (30) is rotatably provided at the top of the storage groove (31), and the metal anchor (6) is limited between the inner protruding block (32) and the cover plate (30) by the cover plate (30).

4. The device for event camera calibration according to claim 3, characterized in that: An inner limiting groove (321) is fixedly provided on one side of the inner protruding block (32) close to the metal anchor (6), a stopper post (325) is rotatably arranged in the inner limiting groove (321), and a clearance groove (324) for making way for the stopper post (325) is provided on one side of the inner limiting groove (321).

5. The device for event camera calibration according to claim 4, characterized in that: An electric control push rod (323) is connected to the inner limit groove (321) via a rotating rod (326); the electric control push rod (323) is rotatably connected to the bottom of the blocking column (325); a lifting spring (322) is fixedly connected to the inner limit groove (321); the lifting spring (322) is tightly pressed against the metal anchor (6).

6. The device for event camera calibration according to claim 4, characterized in that: A trigger assembly (4) is fixedly connected to one side of the event camera (3), and the trigger assembly (4) comprises a connection shell (41), the connection shell (41) is fixedly connected to the outer wall of the event camera (3) housing, a sliding rod (42) is slidably arranged in the connection shell (41), both ends of the sliding rod (42) are arranged outside the connection shell (41), one end of the sliding rod (42) close to the cover plate (30) is fixedly connected to a cross bar (46), and one side of the cross bar (46) close to the cover plate (30) is fixedly connected to a pressure plate (47), and the pressure plate (47) is arranged in cooperation with the cover plate (30).

7. The device for event camera calibration according to claim 6, characterized in that: A side hole (411) is formed in the middle of the connecting shell (41). A side connecting groove (421) is provided on the side wall of the sliding rod (42). Connecting teeth (422) are provided on the inner wall of the side connecting groove (421). A driving motor (45) is fixedly connected to the side wall of the event camera (3). The output end of the driving motor (45) is fixedly connected with a semi-gear (451), and the semi-gear (451) can be engaged with the connecting teeth (422).

8. The device for event camera calibration according to claim 6, characterized in that: One end of the sliding rod (42) far from the cross bar (46) is fixedly connected with a hollow rod (43). A hollow buoyancy ball (44) is fixedly connected to the bottom of the hollow rod (43). The hollow buoyancy ball (44) is communicated with the hollow rod (43).

9. The device for event camera calibration according to claim 3, characterized in that: The event camera (3) is connected to the drone (1) through a calibration component (2). The calibration component (2) includes a fixed connection frame (21). The fixed connection frame (21) is fixedly connected to the bottom of the drone (1) by bolts. A first adjustment motor (22) is connected to the bottom of the fixed connection frame (21). The rotating end of the first adjustment motor (22) is fixedly connected with a mounting frame (23).

10. The device for event camera calibration according to claim 9, characterized in that: A second adjustment motor (24) is fixedly connected to the bottom of one end of the mounting frame (23) far from the first adjustment motor (22). The output end of the second adjustment motor (24) is fixedly connected with a rotating frame (25). The rotating frame (25) is arranged in a "C" shape. The ends of the rotating frame (25) are placed on both sides of the event camera (3), and the side close to the event camera (3) is connected to the event camera (3) through a third adjustment motor (26).

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