Fixing jig for camera calibration

Abstract

The utility model discloses a fixing jig for calibration of a camera, which relates to the field of jigs, and is characterized by comprising a jig body and two clamping jaws, the jig body is provided with a positioning groove for accommodating the camera, the clamping jaws are slidably connected onto the jig body along a Y axis, a tension spring is connected between the two clamping jaws, and the tension spring is connected with the positioning groove. The tension spring is suitable for driving the two clamping jaws to limit the camera in the positioning groove, a plug capable of being inserted into the camera along the Z axis is arranged on the jig body, a driving plate is further connected to the jig body in a sliding mode along the X axis, and when the driving plate slides towards the positioning groove along the X axis, the two clamping jaws are opened, and the plug is pulled out of the camera. According to the utility model, the operation process is simplified, the damage risk of the camera is reduced, the clamping stability is enhanced, and the calibration precision and efficiency are improved.

Description

Technical Field

[0001] This utility model relates to the field of fixtures, and more specifically, it relates to a fixing fixture for camera calibration. Background Technology

[0002] Camera calibration is a fundamental and crucial task in the field of computer vision, directly impacting the accuracy and effectiveness of subsequent tasks such as image processing, 3D reconstruction, and target recognition. In industries like automotive manufacturing, intelligent manufacturing, and security monitoring, cameras are key devices for acquiring external information, and the accuracy of their calibration directly affects the overall performance and reliability of the system. However, in practice, the camera calibration process is often affected by various factors, such as minor deviations in installation location, vibration interference, and temperature changes, all of which can lead to inaccurate calibration results.

[0003] Especially in the automotive industry, with the rapid advancement of autonomous driving technology, the requirements for camera calibration accuracy are becoming increasingly stringent. Before leaving the factory, cameras must be precisely calibrated using calibration equipment. During the calibration process, ensuring that the camera is securely fixed in the predetermined position on the calibration equipment is crucial; any unstable installation or positional deviation can lead to calibration errors.

[0004] However, with currently widely used clamping fixtures, the signal plug of the fixture remains connected to the camera during release. This often requires operators to apply considerable external force to successfully remove the camera. This process is not only cumbersome and increases the difficulty of removal, but also carries the risk of causing unnecessary damage to the camera due to excessive force. Therefore, optimizing the design of the clamping fixture to reduce resistance during removal, ensure the camera's safety and integrity, and maintain clamping stability is of paramount importance. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a fixed fixture for camera calibration, which simplifies the operation process, reduces the risk of camera damage, enhances clamping stability, and improves calibration accuracy and efficiency.

[0006] The above-mentioned technical objective of this utility model is achieved through the following technical solution: a camera calibration fixture, comprising a fixture body, wherein the fixture body is provided with a positioning groove for accommodating a camera, and further comprising two grippers slidably connected to the fixture body along the Y-axis, wherein a tension spring is connected between the two grippers, the tension spring being adapted to drive the two grippers to limit the camera within the positioning groove, wherein the fixture body is provided with a plug that can be inserted into the camera along the Z-axis, and wherein a drive plate is slidably connected to the fixture body along the X-axis, wherein when the drive plate slides along the X-axis toward the positioning groove, the two grippers open and the plug is pulled out from the camera.

[0007] In one embodiment, the treatment body includes a base plate, a top plate, and a side plate fixedly connected between the base plate and the top plate. A positioning seat is detachably connected to the top plate, and a positioning groove is formed on the positioning seat. The positioning groove includes a side wall surrounding the camera and a bottom wall supporting the bottom of the camera.

[0008] In one embodiment, a slide block is slidably connected to the base below the positioning groove along the Z-axis, a support platform is fixed on the slide block, the plug is fixed on the support platform, and the positioning block is provided with an opening for the support platform to extend into the positioning groove.

[0009] In one embodiment, the drive plate is provided with a first drive unit and a second drive unit. The first drive unit includes two inclined surfaces arranged in a figure-eight shape. Two first cam followers are respectively provided on the two grippers. The two first cam followers are in rolling contact with their respective inclined surfaces. The second drive unit includes a first step surface, a second step surface, and an arc-shaped transition surface connecting the first step surface and the second step surface. The height of the first step surface from the base plate is greater than the height of the second step surface from the base plate. The slide is provided with a second cam follower. The second cam follower is in rolling contact with the second drive unit.

[0010] In one embodiment, a spring is provided between the slide and the base plate to lift the seat upward along the X-axis.

[0011] In one embodiment, guide sleeves are respectively provided through the four corners of the slide, and a guide shaft is fixed on the base plate, with the guide shaft slidably connected to the guide sleeves.

[0012] In summary, this utility model has the following beneficial effects: This utility model simplifies the operation process. The operator only needs to push the drive plate to slide to simultaneously open the gripper and unplug the plug, which significantly improves the calibration efficiency and reduces the risk of camera damage. At the same time, the spring-connected gripper provides a uniform and stable clamping force, ensuring that the camera is stable and does not shift during the calibration process, thus improving the calibration accuracy and reliability. Attached Figure Description

[0013] Figure 1 A schematic diagram of the structure of the camera calibration fixture according to an embodiment of this application. Figure 1 ;

[0014] Figure 2 A schematic diagram of the structure of the camera calibration fixture according to an embodiment of this application. Figure 2 ;

[0015] Figure 3 This is a schematic diagram of the positioning groove in the camera calibration fixture according to an embodiment of this application;

[0016] Figure 4 A schematic diagram of the structure of the camera calibration fixture according to an embodiment of this application. Figure 3 ;

[0017] Figure 5 This is a schematic diagram of the camera after it has been mounted on the camera calibration fixture according to an embodiment of this application.

[0018] In the diagram: 1. Fixture body; 1a. Base plate; 1b. Side plate; 1c. Top plate; 1d. Positioning seat; 1d1. Positioning groove; 1d11. Side wall; 1d12. Bottom wall; 1d13. Opening; 2. Gripper; 3. Tension spring; 4. Drive plate; 411. Inclined surface; 412. First step surface; 413. Arc transition surface; 414. Second step surface; 5. Plug; 6. Slide; 7. Guide shaft; 8. Guide sleeve; 9. Support platform; 10. First cam follower; 11. Second cam follower; 12. Spring. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] like Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, an embodiment of this application provides a camera calibration fixture, including a fixture body 1 with a positioning groove 1d1 for accommodating a camera. It also includes two grippers 2 slidably connected to the fixture body 1 along the Y-axis. The grippers 2 are connected to the fixture body 1 via a first slide rail pair, and a tension spring 3 connects the two grippers 2. The tension spring 3 is adapted to drive the two grippers 2 to limit the camera within the positioning groove 1d1. An arc-shaped opening is provided at the relative position of the two grippers 2, allowing for radial clamping of the camera. A plug 5 is provided on the fixture body 1, which can be inserted into the camera along the Z-axis. The plug 5 is connected to a calibration device via a wire and transmits a calibration signal to the camera. A drive plate 4 is also slidably connected to the fixture body 1 along the X-axis via a second slide rail pair. When the drive plate 4 slides along the X-axis toward the positioning groove 1d1, it causes the two grippers 2 to open, allowing the plug 5 to be pulled out of the camera.

[0021] Specifically, a spring 12 is provided between the slide 6 and the base plate 1a to lift the slide 6 upward along the X-axis. The spring 12 not only provides a stable support force for the slide 6, but also ensures that the slide 6 can automatically return to the initial position when it is not driven, which enhances the stability and reliability of the mechanism. At the same time, the elasticity of the spring 12 can effectively buffer and disperse the impact force that the slide 6 may generate during the movement.

[0022] When the aforementioned fixing fixture is in operation, it is installed on the calibration equipment. When the camera is placed in the positioning groove 1d1 of the fixture 1, the two jaws 2, which are slidably connected along the Y-axis, tighten inward under the action of the tension spring 3. The camera is radially clamped through the arc-shaped opening on the jaws 2, ensuring that it is firmly fixed in the positioning groove 1d1. At the same time, the plug 5 on the fixture 1 is manually inserted into the camera along the Z-axis, and connected to the calibration equipment through a wire to transmit the calibration signal to the camera to complete the calibration. After calibration, the operator pushes the drive plate 4 along the X-axis. The sliding of the drive plate 4 will simultaneously cause the two jaws 2 to open outward, releasing the clamping force on the camera, and simultaneously pulling the plug 5 out of the camera, thereby achieving quick and safe removal of the camera. The entire process is simple to operate, ensuring the stability of clamping and avoiding damage to the camera due to excessive external force.

[0023] The above method simplifies the operation process. The operator only needs to push the drive plate 4 to slide to simultaneously open the gripper 2 and pull out the plug 5, which significantly improves the calibration efficiency and reduces the risk of camera damage. At the same time, the gripper 2 connected by the tension spring 3 provides a uniform and stable clamping force to ensure that the camera is stable and does not shift during the calibration process, thereby improving the calibration accuracy and reliability.

[0024] In this embodiment, as Figure 1 and Figure 3 As shown, the fixture 1 includes a base plate 1a, a top plate 1c, and a side plate 1b fixedly connected between the base plate 1a and the top plate 1c. A positioning seat 1d is detachably connected to the top plate 1c by bolts. A positioning groove 1d1 is formed in the positioning seat 1d. The positioning groove 1d1 includes a side wall 1d11 surrounding the camera and a bottom wall 1d12 supporting the bottom of the camera. The positioning seat 1d and the top plate 1c are detachably connected, which facilitates disassembly, replacement, or maintenance, reduces maintenance costs, and also adapts to the calibration requirements of different camera models, improving the versatility and flexibility of the fixture.

[0025] In this embodiment, as Figure 4As shown, a slide block 6 is slidably connected to the base along the Z-axis below the positioning groove 1d1. A support platform 9 is fixed on the slide block 6, and the plug 5 is fixed on the support platform 9. The positioning block 1d has an opening 1d13 for the support platform 9 to extend into the positioning groove 1d1. Specifically, guide sleeves 8 are respectively provided through the four corners of the slide block 6, and a guide shaft 7 is fixed on the base plate 1a. The guide shaft 7 is slidably connected to the guide sleeves 8.

[0026] The above method achieves smooth and precise movement of the plug 5 in the Z-axis direction by setting a slide block 6 on the base, fixing a support platform 9 on the slide block 6 and installing the plug 5, and setting an opening 1d13 on the positioning seat 1d for the support platform 9 to extend into. Combined with the sliding connection design of the guide sleeves 8 at the four corners of the slide block 6 and the guide shaft 7 on the base plate 1a, the plug 5 is ensured to be stably connected and separated from the camera.

[0027] In this embodiment, the drive plate 4 is provided with a first drive part and a second drive part. The first drive part includes two inclined surfaces 411 arranged in a figure-eight shape. The two grippers 2 are respectively provided with first cam followers 10. The two first cam followers 10 are in rolling contact with their respective corresponding inclined surfaces 411. The second drive part includes a first step surface 412, a second step surface 414 and an arc-shaped transition surface 413 connecting the first step surface 412 and the second step surface 414. The height of the first step surface 412 from the bottom plate 1a is greater than the height of the second step surface 414 from the bottom plate 1a. The slide 6 is provided with a second cam follower 11. The second cam follower 11 is in rolling contact with the second drive part.

[0028] In the above method, the drive plate 4 controls the movement of the gripper 2 and the slide 6 through the coordinated operation of the first drive unit and the second drive unit. The two inclined surfaces 411 of the first drive unit, which are arranged in a V-shape, are in rolling contact with the first cam follower 10 on the gripper 2. When the drive plate 4 moves, the change of the inclined surfaces 411 guides the first cam follower 10 to drive the gripper 2 to open and close. At the same time, the first step surface 412, the second step surface 414, and the arc transition surface 413 of the second drive unit are in rolling contact with the second cam follower 11 on the slide 6. As the drive plate 4 moves, the second cam follower 11 rolls on the step surface and the arc transition surface 413, thereby realizing the lifting and smooth transition of the slide 6.

[0029] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A camera calibration fixture, comprising a fixture body (1), wherein the fixture body (1) is provided with a positioning groove (1d1) for accommodating a camera, characterized in that: It also includes two grippers (2) that are slidably connected to the fixture (1) along the Y-axis. A tension spring (3) is connected between the two grippers (2). The tension spring (3) is adapted to drive the two grippers (2) to limit the camera in the positioning groove (1d1). The fixture (1) is provided with a plug (5) that can be inserted into the camera along the Z-axis. The fixture (1) is also slidably connected to a drive plate (4) along the X-axis. When the drive plate (4) slides along the X-axis toward the positioning groove (1d1), it causes the two grippers (2) to open and the plug (5) to be pulled out of the camera.

2. The camera calibration fixture according to claim 1, characterized in that: The treatment body (1) includes a base plate (1a), a top plate (1c), and a side plate (1b) fixedly connected between the base plate (1a) and the top plate (1c). A positioning seat (1d) is detachably connected to the top plate (1c). A positioning groove (1d1) is formed on the positioning seat (1d). The positioning groove (1d1) includes a side wall (1d11) surrounding the camera and a bottom wall (1d12) supporting the bottom of the camera.

3. The camera calibration fixture according to claim 2, characterized in that: A slide block (6) is slidably connected to the base plate (1a) below the positioning groove (1d1) along the Z-axis. A support platform (9) is fixed on the slide block (6). The plug (5) is fixed on the support platform (9). An opening (1d13) is provided on the positioning block (1d) for the support platform (9) to extend into the positioning groove (1d1).

4. The camera calibration fixture according to claim 3, characterized in that: The drive plate (4) is provided with a first drive unit and a second drive unit. The first drive unit includes two inclined surfaces (411) arranged in a figure-eight shape. The two grippers (2) are respectively provided with a first cam follower (10). The two first cam followers (10) are in rolling contact with their respective corresponding inclined surfaces (411). The second drive unit includes a first step surface (412), a second step surface (414) and an arc-shaped transition surface (413) connecting the first step surface (412) and the second step surface (414). The height of the first step surface (412) from the bottom plate (1a) is greater than the height of the second step surface (414) from the bottom plate (1a). The slide (6) is provided with a second cam follower (11). The second cam follower (11) is in rolling contact with the second drive unit.

5. The camera calibration fixture according to claim 3, characterized in that: A spring (12) is provided between the slide (6) and the base plate (1a) to lift the seat upward along the X-axis.

6. The camera calibration fixture according to claim 3, characterized in that: Guide sleeves (8) are respectively provided through the four corners of the slide (6), and a guide shaft (7) is fixed on the base plate (1a). The guide shaft (7) is slidably connected to the guide sleeves (8).

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