Support for camera calibration

Abstract

The utility model provides a support for camera calibration, and the support comprises a main rod which extends in the vertical direction; one end of each supporting leg is rotationally connected with the main rod, and the other end of each supporting leg is used for making contact with a supporting face to form a supporting end; the adjusting rod extends in the transverse direction and is connected with the main rod, and the adjusting rod can move up and down along the main rod; the universal adjusting device is arranged on the adjusting rod and can move along the adjusting rod and rotate around the adjusting rod; and the camera fixing frame is used for fixing a camera, and the camera fixing frame is arranged on the universal adjusting device and can rotate relative to the universal adjusting device. The support for camera calibration is simple and reliable in structure and stable in supporting, the position and the angle of the camera can be conveniently and rapidly adjusted, and the position and the angle of the checkerboard in a camera picture can be adjusted during picture acquisition.

Description

Technical Field

[0001] This application belongs to the field of bracket technology, and in particular relates to a bracket for camera calibration. Background Technology

[0002] In the fields of automated parking and driver assistance, extrinsic parameter calibration helps the system determine the relative position of the vehicle to surrounding obstacles, thereby improving safety and collision avoidance. During the development of surround-view functionality, individually calibrating the extrinsic parameters of individual cameras is a crucial step in ensuring system performance and safety. It not only improves the accuracy of image registration but also plays a vital role in the overall system's safety, performance, and user experience. Accurate extrinsic parameter calibration allows for better realization of high-quality surround-view functionality, providing users with a safe and reliable driving experience. Currently, the commonly used extrinsic parameter calibration method is the Zhang Zhengyou checkerboard calibration method. The main image acquisition process involves printing a checkerboard pattern and taking several sets of photos from different directions.

[0003] The requirements for image acquisition generally necessitate capturing the chessboard pattern from different angles and distances, ensuring the pattern occupies varying positions and angles within the camera's field of view, covering as many directions as possible. Stability must be maintained during image acquisition to avoid camera shake. Therefore, providing a stand capable of mounting and stabilizing the camera, while also allowing for adjustment of its angle and position, is a pressing issue that needs to be addressed. Utility Model Content

[0004] To address the aforementioned technical problems in the prior art, this application provides a camera calibration bracket that can adjust the position and angle of the camera, thereby adjusting the position and angle of the checkerboard pattern within the camera's view during image acquisition.

[0005] The technical solution adopted in this application embodiment is: a camera calibration bracket, comprising:

[0006] Main rod, which extends vertically;

[0007] The system has three legs, one end of which is rotatably connected to the main rod, and the other end of which is used to contact the support surface to form a support end.

[0008] An adjusting rod extends laterally and is connected to the main rod, the adjusting rod being capable of moving up and down along the main rod;

[0009] A universal adjustment device is mounted on the adjustment rod and is capable of moving along the adjustment rod and rotating around the adjustment rod.

[0010] A camera mounting bracket is used to fix a camera. The camera mounting bracket is mounted on the universal adjustment device and can rotate relative to the universal adjustment device.

[0011] In an optional embodiment, the camera calibration bracket further includes three connecting rods. The first ends of the three connecting rods are rotatably connected to the three legs, and the second ends of the three connecting rods are rotatably connected to the main rod, and the connection positions with the main rod can be changed to adjust the opening angle of the three legs. The connection positions of the three connecting rods with the main rod are located below the connection positions of the three legs with the main rod.

[0012] In an optional embodiment, a first connecting seat that can slide along the main rod is sleeved on the main rod, and the first connecting seat is provided with three first shaft seats arranged around the main rod, and each of the three first shaft seats is provided with a first shaft.

[0013] The second end of each of the three connecting rods is provided with a first shaft hole, and the first shaft rods are inserted into the first shaft holes one by one, so that the three connecting rods can rotate around their corresponding first shaft rods to open or close synchronously.

[0014] In an optional embodiment, the camera calibration bracket further includes a first locking mechanism. The first locking mechanism includes a first connecting sleeve and a first locking member. The first connecting sleeve is connected to the bottom of the first connecting seat and wraps around the outer periphery of the main rod. The first locking member is sleeved outside the first connecting sleeve and can rotate relative to the first connecting sleeve to adjust the tightness of the first connecting sleeve and the main rod.

[0015] In an optional embodiment, the first connecting sleeve includes a cylindrical section and a hollow frustum section. One end of the cylindrical section is connected to the first connecting seat, and the other end is connected to the large-diameter end of the frustum section. The outer circumferential surface of the cylindrical section is provided with external threads. The frustum section is provided with a plurality of notches extending in a direction parallel to the axial direction of the main rod to divide the frustum section into a plurality of first elastic arms that can be opened or closed relative to each other.

[0016] The first locking member is sleeve-shaped and has internal threads. The first locking member is threadedly connected to the first connecting sleeve. When the first locking member rotates from the small diameter end of the frustum section to its large diameter end, it simultaneously pushes multiple first spring arms to close relative to each other to hold the main rod. When the first locking member rotates from the large diameter end of the frustum section to its small diameter end, the multiple first spring arms open relative to each other to release the holding on the main rod, so that the first connecting seat can move relative to the main rod.

[0017] In an optional embodiment, a second connecting seat that can slide along the main rod is sleeved on the main rod, and the second connecting seat is provided with three second shaft seats arranged around the main rod, and each of the three second shaft seats is provided with a second shaft.

[0018] Each of the three legs has a second shaft hole at one end, and the second shaft rods are inserted into the second shaft holes one by one, so that the three legs can rotate around their corresponding second shaft rods to open or close synchronously.

[0019] In an optional embodiment, one end of the adjusting rod is provided with a first connecting ring, which is sleeved on the main rod. The first connecting ring has an opening to form opposite ends, and the two ends extend outwardly along the radial direction of the first connecting ring to form connecting portions. Fasteners are passed through the two connecting portions to bring the two connecting portions closer together or separate them, so that the first connecting ring is clamped onto the main rod or released from the main rod.

[0020] In an optional embodiment, the universal adjustment device includes a second connecting ring, which is sleeved on the adjustment rod. The second connecting ring is provided with a fastening member, which is used to fix the second connecting ring on the adjustment rod or to release it from the adjustment rod.

[0021] In an optional embodiment, the universal adjustment device further includes a ball joint and a second locking mechanism, wherein the ball joint is fixed to the second connecting ring;

[0022] The second locking mechanism includes a second connecting sleeve and a second locking member. The second connecting sleeve is disposed on the camera mounting bracket and wraps around the outer periphery of the ball head. The second locking member is threadedly connected to the second connecting sleeve and can rotate relative to the second connecting sleeve to adjust the tightness of the second connecting sleeve and the ball head.

[0023] In an optional embodiment, the camera mounting bracket includes two opposing side arms and a bottom arm connecting the two side arms. The two side arms and the bottom arm form a mounting cavity for accommodating the camera. One of the side arms has a threaded hole, and a tightening screw passes through the threaded hole. The tightening screw is used to press the camera against the other side arm.

[0024] Compared with the prior art, the beneficial effects of the embodiments of this application are as follows: the camera calibration bracket structure of this application is simple and reliable, and provides stable support; the adjustment of the camera position and angle is convenient and quick, and when capturing images in a checkerboard pattern, the position and angle of the camera can be easily adjusted so that the checkerboard pattern occupies different positions and angles in the camera's field of view, covering all directions as much as possible, which greatly improves the efficiency of camera calibration and development; after folding and storing, it occupies a small area, is lightweight, and is easy to carry or move.

[0025] It should be understood that the foregoing general description and the following detailed description are exemplary and illustrative only, and are not intended to limit this application.

[0026] The overview of various implementations or examples of the technology described in this application is not a full disclosure of the entire scope or all features of the disclosed technology. Attached Figure Description

[0027] In drawings that are not necessarily drawn to scale, the same reference numerals may describe similar parts in different views. The drawings generally illustrate various embodiments by way of example rather than limitation and are used, together with the description and claims, to illustrate the disclosed embodiments. Where appropriate, the same reference numerals are used in all drawings to refer to the same or similar parts. Such embodiments are illustrative and not intended to be exhaustive or exclusive embodiments of the apparatus or method.

[0028] Figure 1 This is a three-dimensional structural diagram of a camera calibration bracket according to an embodiment of this application.

[0029] Figure 2 for Figure 1 Enlarged view of section A.

[0030] Figure 3 for Figure 1 Enlarged view of section B.

[0031] Figure 4 for Figure 1 Enlarged view of section C.

[0032] Figure 5 for Figure 1 Enlarged view of section D.

[0033] Figure 6 This is an exploded view of the main rod, connecting rod, and first locking mechanism according to an embodiment of this application.

[0034] Figure 7 This is a three-dimensional structural diagram of the first connecting seat combined with the first connecting sleeve according to an embodiment of this application.

[0035] Figure 8This is a three-dimensional structural diagram of the second connector according to an embodiment of this application.

[0036] Figure 9 This is an exploded view of the adjusting rod, the second locking mechanism, and the camera mounting bracket according to an embodiment of this application.

[0037] Figure label:

[0038] 1-Main rod;

[0039] 2-Feet;

[0040] 3-Adjusting rod; 31-First connecting ring; 32-Connecting part; 33-Fastener;

[0041] 4-Connecting rod; 41-Rotating shaft; 42-First shaft hole;

[0042] 5-First connecting seat; 51-First shaft seat body; 52-First shaft; 53-Through hole;

[0043] 6-First locking mechanism; 61-First connecting sleeve; 611-Cylindrical section; 612-Frustum section; 6121-Notch; 6122-First spring arm; 62-First locking element;

[0044] 7-Second connecting seat; 71-Second shaft seat body; 72-Second shaft;

[0045] 8-Universal adjustment device; 81-Second connecting ring; 82-Fixing member; 83-Ball head; 84-Second locking mechanism; 841-Second connecting sleeve; 842-Second locking member;

[0046] 9-Camera mounting bracket; 91-Side arm; 92-Bottom arm; 93-Mounting cavity; 94-Tightening screw; 95-Abutting part; 96-Washer;

[0047] 10-Camera. Detailed Implementation

[0048] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the described embodiments of this application without creative effort are within the scope of protection of this application.

[0049] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," and similar terms used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0050] To keep the following description of the embodiments of this application clear and concise, detailed descriptions of known functions and known components are omitted.

[0051] like Figure 1 As shown in the figure, this application provides a camera calibration bracket, which includes a main rod 1, three legs 2, an adjusting rod 3, a universal adjustment device 8, and a camera fixing bracket 9.

[0052] Continue to combine Figure 1 The main rod 1 extends vertically and has an upper and lower end. One end of each of the three support legs 2 is rotatably connected to the main rod 1, and the other end of each support leg 2 is a free end, used to contact the supporting surface to form a support end. An adjusting rod 3 extends laterally and is connected to the main rod 1, and the adjusting rod 3 can move up and down along the main rod 1 to change its height. The connection point between the adjusting rod 3 and the main rod 1 is located above the connection point between one end of each of the three support legs 2 and the main rod 1. A universal adjustment device 8 is provided on the adjusting rod 3 and can move along and rotate around the adjusting rod 3. A camera mounting bracket 9 is provided on the universal adjustment device 8 and can rotate relative to the universal adjustment device 8. The camera 10 is fixed to the camera mounting bracket 9.

[0053] The camera calibration bracket in this embodiment provides stable support through three legs 2, offering excellent balance and stability, and adapting to uneven support surfaces. It prevents camera 10 from shaking or wobbling during shooting, ensuring image quality. When the adjusting rod 3 moves up and down along the main rod 1, it moves the camera 10 up and down synchronously, adjusting the height (vertical direction) of the camera 10. Conversely, when the universal adjustment device 8 moves along the adjusting rod 3, it moves the camera 10 laterally, adjusting its horizontal position. This allows for arbitrary spatial adjustment of the camera 10. When the universal adjustment device 8 rotates around the adjusting rod 3, it rotates the camera 10 synchronously. When the camera mounting bracket 9 rotates around the universal adjustment device 8, it rotates the camera 10 relative to the universal adjustment device 8. The combination of these two rotations enables the camera 10 to rotate in all directions. Therefore, the camera calibration bracket in this embodiment can adjust the camera 10 to any position and angle, meeting the camera 10's need to capture images from different positions and angles, such as a checkerboard pattern.

[0054] It is understood that the so-called supporting surface refers to the surface where the bracket is placed during use. The supporting surface can be, for example, the ground or a tabletop. For ease of description, the following explanation will use the bracket placed on the ground as an example. Furthermore, when the three legs 2 are closed, the end rotatably connected to the main rod 1 is above the other end (i.e., the support end). For ease of description, the end rotatably connected to the main rod 1 of each leg 2 will be defined as its upper end, and the support end will be defined as its lower end. The lower end of the main rod 1 is at a higher height than the lower ends of the three legs 2, so that the lower end of the main rod 1 is suspended in the air and does not touch the ground, thus avoiding affecting the contact between the three legs 2 and the ground.

[0055] In this embodiment, the three legs 2 are rotatably connected to the main rod 1, allowing them to open or close relative to the main rod 1. When the three legs 2 are open, they form a tripod structure, providing stable support on the ground and offering better stability. When the three legs 2 are closed, they rest against the main rod 1, reducing space occupation and facilitating storage and carrying. Furthermore, the bottom of the legs 2 can be equipped with replaceable rubber anti-slip pads to enhance friction with the ground and improve stability.

[0056] In some embodiments, continue to combine Figure 1The camera calibration bracket also includes three connecting rods 4. The first end of each connecting rod 4 is rotatably connected to one of the three legs 2, and the second end of each connecting rod 4 is rotatably connected to the main rod 1. The connection position of the second end of the connecting rod 4 to the main rod 1 can be changed; that is, the second end of the connecting rod 4 can move up and down along the main rod 1 to adjust the opening angle of the three legs 2. The connection position of the three connecting rods 4 to the main rod 1 is located below the connection position of the three legs 2 to the main rod 1. The connecting rods 4 further connect the three legs 2 to the main rod 1 to form a more stable support structure.

[0057] The specific rotational connection method between the first ends of the three connecting rods 4 and the three support legs 2 is not specifically limited in this application; for example, a hinged or pivotal connection can be used. Figure 2 and Figure 6 As shown in the figure, this embodiment shows that a rotating shaft 41 is provided at the first end of the connecting rod 4, and a through hole (not shown in the figure) is provided radially at the lower part of the support leg 2. The rotating shaft 41 passes through the through hole and can rotate within the through hole, thus realizing the rotatable connection between the connecting rod 4 and the support leg 2.

[0058] In some embodiments, such as Figure 6 As shown, the second ends of the three connecting rods 4 are respectively provided with first shaft holes 42. The axial direction of the first shaft holes 42 is perpendicular to the extension direction of the connecting rod 4, that is, the first shaft holes 42 are set along the radial direction of the connecting rod 4.

[0059] like Figure 1 and Figure 7 As shown, a first connecting seat 5 that can slide along the main rod 1 is sleeved on the main rod 1. The first connecting seat 5 is provided with three first shaft seats 51 arranged around the main rod 1. The three first shaft seats 51 are respectively provided with first shafts 52, and the first shafts 52 are correspondingly inserted into the first shaft holes 42 (see...). Figure 3 This allows the three connecting rods 4 to rotate around their corresponding first shaft 52, thereby causing the three support legs 2 to open or close synchronously. By setting the first connecting seat 5, the second ends of the three connecting rods 4 can move synchronously along the main rod 1, thereby achieving synchronous opening and closing of the three support legs 2 and improving the convenience of control.

[0060] like Figure 7As shown, a through hole 53 can be provided on the first connecting seat 5. The first connecting seat 5 is sleeved on the main rod 1 through the through hole 53. The hole wall of the through hole 53 is not tightly fitted with the outer peripheral wall of the main rod 1, so that the first connecting seat 5 can slide along the main rod 1. The first shaft seat body 51 may include two mounting plates arranged opposite each other. The second end of the connecting rod 4 extends into the space between the two mounting plates. The first shaft 52 passes through one of the mounting plates, the first shaft hole 42 of the connecting rod 4, and the other mounting plate in sequence, thereby rotatably connecting the second end of the connecting rod 4 to the two mounting plates.

[0061] In some embodiments, such as Figure 3 , Figure 6 and Figure 7 As shown, the camera calibration bracket also includes a first locking mechanism 6. The first locking mechanism 6 includes a first connecting sleeve 61 and a first locking member 62. The first connecting sleeve 61 is fixedly connected to the bottom of the first connecting seat 5 and wraps around the outer periphery of the main rod 1. The first locking member 62 is sleeved on the outside of the first connecting sleeve 61 and can rotate relative to the first connecting sleeve 61 to adjust the tightness of the first connecting sleeve 61 and the main rod 1. By setting the first locking mechanism 6, the first connecting seat 5 can be locked in the adjusted position, thereby fixing the position of the three support legs 2 and ensuring the stability of the three support legs 2.

[0062] In an optional embodiment, continue to combine Figure 7 The first connecting sleeve 61 includes a cylindrical section 611 and a hollow frustum section 612. One end of the cylindrical section 611 is connected to the first connecting seat 5, and the other end is connected to the large-diameter end of the frustum section 612. The outer circumferential surface of the cylindrical section 611 is provided with external threads (since the attached figure is only for example and the external threads are not shown, similarly, the internal threads are not shown below). The frustum section 612 is provided with a plurality of notches 6121 extending in a direction parallel to the axial direction of the main rod 1 to divide the frustum section 612 into a plurality of first spring arms 6122 that can be opened or closed relative to each other.

[0063] like Figure 6 As shown, the first locking member 62 is sleeve-shaped and has internal threads. The first locking member 62 is threadedly connected to the first connecting sleeve 61. When the first locking member 62 rotates from the small diameter end of the frustum section 612 to its large diameter end, it simultaneously pushes multiple first spring arms 6122 to close relative to each other to hold the main rod 1, so that the first connecting seat 5 cannot move along the main rod 1. When the first locking member 62 rotates from the large diameter end of the frustum section 612 to its small diameter end, the multiple first spring arms 6122 open relative to each other to loosen the holding on the main rod 1, so that the first connecting seat 5 can move relative to the main rod 1, so as to facilitate the adjustment of the connection position between the connecting rod 4 and the main rod 1, and thus adjust the opening angle of the three support legs 2.

[0064] It should be noted that, in order to be able to connect with the first connecting sleeve 61 by thread and to act on the first spring arm 6122 when rotated, the inner diameter of the first locking member 62 is also a non-uniform diameter structure, and its inner wall does not need to be fully threaded.

[0065] It is understandable that when the first connecting seat 5 moves upward along the main rod 1, it pulls the three connecting rods 4 together, which in turn drives the three support legs 2 to close, while simultaneously pushing the main rod 1 higher; when the first connecting seat 5 moves downward along the main rod 1, it pulls the three connecting rods 4 apart, which in turn drives the three support legs 2 to open, while simultaneously pulling the main rod 1 downward, lowering its height. Thus, by adjusting the position of the first connecting seat 5 on the main rod 1, the height of the main rod 1 can be adjusted. This allows the height of the camera 10 to be adjusted not only by moving the adjusting rod 3 up and down along the main rod 1, but also by adjusting the position of the first connecting seat 5 on the main rod 1, making the adjustment method more flexible and the height adjustment range wider. Therefore, the first locking mechanism 6 in this embodiment allows users to quickly and easily adjust the height of the support legs 2, ultimately achieving the adjustment of the main rod 1's height. The main rod 1's height adjustment can adapt to different scenario requirements.

[0066] In some embodiments, such as Figure 1 and Figure 4 As shown, the upper ends of the three support legs 2 are simultaneously connected to the same second connecting seat 7. The second connecting seat 7 is sleeved on the main rod 1 and can slide along the main rod 1. The structure of the second connecting seat 7 is basically the same as that of the first connecting seat 5, and the way the second connecting seat 7 and the main rod 1 are matched is also basically the same as that of the first connecting seat 5.

[0067] like Figure 8 As shown, the second connecting seat 7 is provided with three second shaft seats 71 arranged around the main rod 1, and each of the three second shaft seats 71 is provided with a second shaft 72. The upper end of each of the three support legs 2 is provided with a second shaft hole (the second shaft hole is not shown in the figure because it is obscured), and the axial direction of the second shaft hole is perpendicular to the axial extension direction of the support leg 2 to which it is located. The second shaft 72 is inserted into the second shaft hole of the three support legs 2 one by one, so that the three support legs 2 can rotate around their corresponding second shaft 72 and open or close synchronously.

[0068] The connection method between the adjusting rod 3 and the main rod 1 is not limited, as long as the adjusting rod 3 can move along the main rod 1 and be fixed in its moved position. For example, multiple first positioning holes can be arranged in a row along the axial direction on the main rod 1, and second positioning holes can be arranged on the adjusting rod 3. When the adjusting rod 3 moves along the main rod 1, the second positioning holes can be aligned with the multiple first positioning holes in sequence and locked by positioning pins (positioning beads).

[0069] To enable the adjusting rod 3 to not only move along the main rod 1 to adjust its position, but also to rotate around the main rod 1 to adjust its angle, the adjusting rod 3 can be connected to the main rod 1 via a clamp. For example, as shown... Figure 5 As shown, one end of the adjusting rod 3 is provided with a first connecting ring 31, which is sleeved on the main rod 1. The first connecting ring 31 has an opening to form two opposing ends, and each end extends outward along the radial direction of the first connecting ring 31 to form a connecting portion 32. Fasteners 33 are passed through the two connecting portions 32. The fasteners 33 are used to bring the two connecting portions 32 closer together or separate them to adjust the inner diameter of the connecting ring and change the tightness of the connection between the connecting ring and the main rod 1, that is, to make the first connecting ring 31 tighten onto the main rod 1 or loosen from the main rod 1. The fasteners 33 can be in the form of a bolt and nut. The two connecting portions 32 are provided with corresponding through holes. The bolt passes through the two through holes, and the nut is threaded onto the bolt. When the nut is rotated toward the connecting portion 32, pushing the two connecting portions 32 closer together, the inner diameter of the first connecting ring 31 gradually decreases and tightens onto the main rod 1, thereby fixing the adjusting rod 3 on the main rod 1. When it is necessary to adjust the position and angle of the adjusting rod 3 on the main rod 1, rotate the nut away from the connecting part 32 to release the push on the two connecting parts 32. The two connecting parts 32 gradually separate, and at the same time, the inner diameter of the first connecting ring 31 gradually increases, forming a gap with the main rod 1. The first connecting ring 31 can move up and down along the main rod 1 and rotate around the main rod 1. The movement and rotation of the first connecting ring 31 will drive the adjusting rod 3 (and its universal adjustment device 8, camera mounting bracket 9 and camera 10) to move and rotate. A wing nut can be used for the thread for easy operation. The method of connecting the adjusting rod 3 to the main rod 1 through the first connecting ring 31 is not only simple in structure, but also allows the user to easily adjust the height of the adjusting rod 3 on the main rod 1.

[0070] In some embodiments, such as Figure 5 and Figure 9 As shown, the universal adjustment device 8 includes a second connecting ring 81, which is sleeved on the adjustment rod 3. A locking member 82 is provided on the second connecting ring 81, which is used to fix the second connecting ring 81 to or release it from the adjustment rod 3. For example, the locking member 82 can be a set screw. The second connecting ring 81 has a threaded hole extending radially therefrom. One end of the set screw is fixed with a butterfly knob, and the other end of the set screw passes through the threaded hole and extends into the second connecting ring 81, abutting against the adjustment rod 3. When the butterfly knob is rotated, the set screw will move closer to or further away from the adjustment rod 3, causing the other end of the set screw to press against or release from the adjustment rod 3, thus fixing or releasing the second connecting ring 81 from the adjustment rod 3. The second connecting ring 81 can drive the universal adjustment device 8 and its camera mounting bracket 9 to move along or rotate around the adjustment rod 3.

[0071] In some embodiments, continue to combine Figure 5 and Figure 9 The universal adjustment device 8 also includes a ball head 83 and a second locking mechanism 84. The ball head 83 is fixed to the second connecting ring 81 and can move along the adjusting rod 3 or rotate around the adjusting rod 3 together with the second connecting ring 81. The second locking mechanism 84 includes a second connecting sleeve 841 and a second locking member 842. The second connecting sleeve 841 is disposed on the camera mounting bracket 9 and wraps around the outer periphery of the ball head 83. The second locking member 842 is threadedly connected to the second connecting sleeve 841 and can rotate relative to the second connecting sleeve 841 to adjust the tightness of the second connecting sleeve 841 and the ball head 83. That is, the second locking member 842 can make the second connecting sleeve 841 tightly hug the outside of the ball head 83 and not be able to rotate relative to the ball head 83, or make there a gap between the second connecting sleeve 841 and the ball head 83 so that it can rotate relative to the ball head 83. When the second connecting sleeve 841 rotates, it will drive the camera mounting bracket 9 and the camera 10 fixed thereto to rotate together. The universal adjustment device 8 of this application supports 360-degree rotation, allowing users to quickly lock or release it for easy adjustment of the shooting angle.

[0072] The structure of the second locking mechanism 84 is basically the same as that of the first locking mechanism 6. The second connecting sleeve 841 of the second locking mechanism 84 has a cylindrical section and a hollow frustum section. The cylindrical section has external threads, and the frustum section has a notch, so that it can be easily deformed under the action of the second locking member 842 to clamp or loosen with the ball head 83. The second locking member 842 is sleeve-shaped and has internal threads, that is, the second locking member 842 is a lock nut.

[0073] In some embodiments, such as Figure 9 As shown, the camera mounting bracket 9 includes two opposing side arms 91 and a bottom arm 92 connecting the two side arms 91. The two side arms and the bottom arm 92 form a U-shaped structure, within which a mounting cavity 93 is formed for accommodating the camera 10. One side arm has a threaded hole, and a tightening screw 94 passes through the threaded hole to secure the camera 10 against the other side arm. The camera mounting bracket 9 has a simple and reasonable structure, provides a stable and reliable fixing effect, and is applicable to any type of camera 10, exhibiting strong versatility.

[0074] To increase the contact area between the tightening screw 94 and the camera 10, improve the stability of the connection, and prevent damage to the camera 10, an abutment portion 95 with a large pushing surface can be provided at the end of the tightening screw 94 that interacts with the camera 10. Additionally, a gasket 96 can be provided on the inner side of the other sidewall of the camera mount (the side interacting with the camera 10) to protect the camera 10.

[0075] The camera calibration bracket of this application embodiment can adjust the vertical position of the camera 10 by raising and lowering the main rod 1 relative to the three support legs 2 and by moving the adjusting rod 3 along the main rod 1; the horizontal position of the camera 10 can be adjusted by moving the second connecting ring 81 along the adjusting rod 3; and the camera 10 can be rotated in all directions by rotating the adjusting rod 3 around the main rod 1, rotating the second connecting ring 81 around the adjusting rod 3, and rotating the second connecting sleeve 841 around the ball head 83, which makes it convenient for the camera 10 to adjust the position and angle of the checkerboard grid in the camera 10's image during image acquisition.

[0076] The length of the main pole 1 can be selected as needed. To provide the required height, the length of the main pole 1 can be designed to be, for example, about 1m. The material of the main pole 1 can be aluminum alloy to ensure strength and corrosion resistance.

[0077] The length of leg 2 can be selected as needed. To provide an adjustable height to meet shooting requirements, the length of leg 2 can be designed to be, for example, around 50cm. The material of leg 2 can be, for example, aluminum alloy, to ensure lightweight and high strength.

[0078] The length of the adjusting rod 3 can be selected as needed. The length of the adjusting rod 3 can be designed to be, for example, about 50cm long, to provide flexible adjustment. The diameter of the adjusting rod 3 can be designed to be, for example, about 2cm, to ensure strength and stability.

[0079] The ball head 83 can be made of high-strength plastic or aluminum alloy to ensure durability.

[0080] The camera mount 9 adopts a "U" shaped structure and is made of lightweight, high-strength plastic to ensure durability and light weight.

[0081] The camera calibration bracket of this application embodiment is easy to fold and transport, making it ideal for outdoor occasions with frequent movement. In addition, shock-absorbing material can be installed inside the ball head 83 to reduce image blurring caused by environmental vibrations during shooting; a level indicator can be integrated on the bottom arm 92 of the camera mount 9 to help the user maintain a level position during shooting.

[0082] The above description is intended to be illustrative and not restrictive. Those skilled in the art can make variations, modifications, substitutions, and alterations to the above embodiments within the scope of this disclosure. Moreover, the above examples (or one or more of them) can be used in combination with each other, and these embodiments can be combined with each other in various combinations or arrangements.

Claims

1. A camera calibration bracket, characterized in that, include: Main rod, which extends vertically; The system has three legs, one end of which is rotatably connected to the main rod, and the other end of which is used to contact the support surface to form a support end. An adjusting rod extends laterally and is connected to the main rod, the adjusting rod being capable of moving up and down along the main rod; A universal adjustment device is mounted on the adjustment rod and is capable of moving along the adjustment rod and rotating around the adjustment rod. A camera mounting bracket is used to fix a camera. The camera mounting bracket is mounted on the universal adjustment device and can rotate relative to the universal adjustment device.

2. The camera calibration bracket according to claim 1, characterized in that, The camera calibration bracket also includes three connecting rods. The first ends of the three connecting rods are rotatably connected to the three legs, and the second ends of the three connecting rods are rotatably connected to the main rod, and can change the connection position with the main rod to adjust the opening angle of the three legs. The connection position of the three connecting rods with the main rod is located below the connection position of the three legs with the main rod.

3. The camera calibration bracket according to claim 2, characterized in that, The main rod is fitted with a first connecting seat that can slide along it. The first connecting seat is provided with three first shaft seats arranged around the main rod. Each of the three first shaft seats is provided with a first shaft. The second end of each of the three connecting rods is provided with a first shaft hole, and the first shaft rods are inserted into the first shaft holes one by one, so that the three connecting rods can rotate around their corresponding first shaft rods to open or close synchronously.

4. The camera calibration bracket according to claim 3, characterized in that, The camera calibration bracket further includes a first locking mechanism, which includes a first connecting sleeve and a first locking member. The first connecting sleeve is connected to the bottom of the first connecting seat and wraps around the outer periphery of the main rod. The first locking member is sleeved outside the first connecting sleeve and can rotate relative to the first connecting sleeve to adjust the tightness of the first connecting sleeve and the main rod.

5. The camera calibration bracket according to claim 4, characterized in that, The first connecting sleeve includes a cylindrical section and a hollow frustum section. One end of the cylindrical section is connected to the first connecting seat, and the other end is connected to the large diameter end of the frustum section. The outer circumferential surface of the cylindrical section is provided with external threads. The frustum section is provided with multiple notches extending in a direction parallel to the axial direction of the main rod to divide the frustum section into multiple first elastic arms that can be opened or closed relative to each other. The first locking member is sleeve-shaped and has internal threads. The first locking member is threadedly connected to the first connecting sleeve. When the first locking member rotates from the small diameter end of the frustum section to its large diameter end, it simultaneously pushes multiple first spring arms to close relative to each other to hold the main rod. When the first locking member rotates from the large diameter end of the frustum section to its small diameter end, the multiple first spring arms open relative to each other to release the holding on the main rod, so that the first connecting seat can move relative to the main rod.

6. The camera calibration bracket according to claim 1, characterized in that, The main rod is fitted with a second connecting seat that can slide along it. The second connecting seat is provided with three second shaft seats arranged around the main rod. Each of the three second shaft seats is provided with a second shaft. Each of the three legs has a second shaft hole at one end, and the second shaft rods are inserted into the second shaft holes one by one, so that the three legs can rotate around their corresponding second shaft rods to open or close synchronously.

7. The camera calibration bracket according to claim 1, characterized in that, One end of the adjusting rod is provided with a first connecting ring, which is sleeved on the main rod. The first connecting ring has an opening to form two opposing ends. The two ends extend outward along the radial direction of the first connecting ring to form connecting portions. Fasteners are passed through the two connecting portions to bring the two connecting portions closer together or separate them, so that the first connecting ring is held tightly on the main rod or released from the main rod.

8. The camera calibration bracket according to claim 1, characterized in that, The universal adjustment device includes a second connecting ring, which is sleeved on the adjustment rod. The second connecting ring is provided with a fastening member, which is used to fix the second connecting ring on the adjustment rod or to release it from the adjustment rod.

9. The camera calibration bracket according to claim 8, characterized in that, The universal adjustment device also includes a ball head and a second locking mechanism, wherein the ball head is fixed on the second connecting ring; The second locking mechanism includes a second connecting sleeve and a second locking member. The second connecting sleeve is disposed on the camera mounting bracket and wraps around the outer periphery of the ball head. The second locking member is threadedly connected to the second connecting sleeve and can rotate relative to the second connecting sleeve to adjust the tightness of the second connecting sleeve and the ball head.

10. The camera calibration bracket according to claim 1, characterized in that, The camera mounting bracket includes two side arms arranged opposite each other and a bottom arm connecting the two side arms. The two side arms and the bottom arm form a mounting cavity for accommodating the camera. One of the side arms has a threaded hole, and a tightening screw passes through the threaded hole. The tightening screw is used to press the camera against the other side arm.

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