A calibration device for an optical motion capture camera

Abstract

The utility model discloses a kind of optical dynamic capture camera's calibration device, it is related to computer vision technical field, including calibration mechanism and moving assembly, the calibration mechanism is equipped with integrated design, with fixed positional relationship, multiple static reflection calibration points and dynamic reflection calibration points are respectively laid in the different side of L-shaped calibration rod, after static calibration is completed, only by driving L-shaped calibration rod rotation can make dynamic reflection calibration point quickly towards optical action capture camera, directly start dynamic calibration process, the design realizes the instantaneous switching of two kinds of calibration state, greatly simplifies operation process, significantly improves overall calibration efficiency, configured the moving assembly of driving calibration mechanism to realize horizontal movement, and electric cylinder to drive its completion longitudinal displacement, by mechanical structure replaces manual operation, without staff manually waving calibration mechanism in dynamic calibration process, reduce the labor intensity of staff.

Description

Technical Field

[0001] This utility model relates to the field of computer vision technology, specifically to a calibration device for an optical motion capture camera. Background Technology

[0002] With the continuous development of computer vision technology, optical motion capture systems have been widely used. Camera calibration is a very important and essential part of optical motion capture systems. The main task of optical motion capture camera calibration is to take pictures of target objects with specific marker points by multiple optical motion capture cameras, and perform corresponding transformations and calculations based on the correspondence between 3D coordinates in space and 2D coordinates in the camera images to obtain the internal and external parameters of each camera in the optical motion capture system. This process requires the use of professional calibration equipment.

[0003] Patent CN220323908U discloses a calibration device for an optical motion capture camera. This prior art is simple, convenient, and practical, which greatly reduces the complexity of camera calibration in optical motion capture systems. While ensuring high-precision calibration, it also reduces the requirements for calibration sites and the maintenance costs of the system.

[0004] However, some shortcomings still exist: Existing calibration devices separate static and dynamic calibration components, requiring manual replacement of the corresponding components when switching between static and dynamic calibration. This process is cumbersome and lacks flexibility, making it impossible to quickly switch between the two calibration modes. Furthermore, during dynamic calibration, operators need to manually manipulate the calibration components, which not only increases their workload but may also affect calibration efficiency and data stability due to human error.

[0005] Therefore, those skilled in the art have proposed a calibration device for optical motion capture cameras. Utility Model Content

[0006] To address the shortcomings of existing technologies, this invention provides a calibration device for an optical motion capture camera, thus solving the problems mentioned above.

[0007] To achieve the above objectives, this utility model is implemented through the following technical solution: a calibration device for an optical motion capture camera, comprising a calibration mechanism, the calibration mechanism comprising a stationary L-shaped base, a motor mounted on the side of the L-shaped base, an L-shaped calibration rod mounted on the drive end of the motor, a set of L-shaped static reflective calibration points mounted on the L-shaped side of the L-shaped calibration rod, and a set of uniformly distributed dynamic reflective calibration points mounted on the upper side of the L-shaped calibration rod.

[0008] A movable component is also provided below the calibration mechanism, which drives the calibration mechanism to move for dynamic calibration.

[0009] As a further technical solution of this utility model, the moving component includes a moving base, and a strip groove is formed on the upper side of the moving base.

[0010] As a further technical solution of this utility model, a screw is rotatably installed in the strip groove, a second motor with a drive end connected to one end of the screw is installed at one end of the movable seat, and a threaded seat that is slidably connected to the inner wall of the strip groove is threaded on the screw.

[0011] As a further technical solution of this utility model, a fixing block adapted to the upper side of the threaded seat is provided, and the upper side of the fixing block has four through holes in a rectangular shape.

[0012] As a further technical solution of this utility model, a bolt hole adapted to each through hole is provided on the upper side of the threaded seat, and a bolt is provided between the through hole and the bolt hole aligned with it.

[0013] As a further technical solution of this utility model, an electric cylinder with the end of a telescopic arm connected to an L-shaped seat is installed at the center of the upper side of the fixing block.

[0014] This invention provides a calibration device for an optical motion capture camera. Compared with the prior art, it has the following advantages: 1. A calibration device for an optical motion capture camera, wherein the calibration mechanism adopts an integrated design, and multiple static reflective cursor points and dynamic reflective cursor points are respectively arranged on different sides of an L-shaped calibration rod in a fixed positional relationship. After the static calibration is completed, the dynamic reflective cursor points can be quickly turned toward the optical motion capture camera by simply driving the L-shaped calibration rod to start the dynamic calibration process directly. This design realizes the instantaneous switching between the two calibration states, greatly simplifies the operation process, and significantly improves the overall calibration efficiency.

[0015] 2. A calibration device for an optical motion capture camera, comprising a moving component that drives the calibration mechanism to move laterally, and an electric cylinder that drives it to move longitudinally. By replacing manual operation with a mechanical structure, during dynamic calibration, the lateral and longitudinal movements of the calibration mechanism can be precisely controlled solely by the aforementioned driving component, ensuring that the dynamic reflective calibration point completes the calibration action according to a preset trajectory, without requiring manual manipulation by the operator. This design not only reduces the labor intensity of the operator but also avoids errors caused by human operation, improving the stability and reliability of the calibration process. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a calibration device for an optical motion capture camera.

[0017] Figure 2 This is a schematic diagram of the second state structure of a calibration device for an optical motion capture camera.

[0018] Figure 3 This is a schematic diagram of the calibration mechanism of a calibration device for an optical motion capture camera.

[0019] Figure 4 This is a schematic diagram of the moving component structure of a calibration device for an optical motion capture camera.

[0020] Figure 5 This is a schematic diagram of the fixed component structure of a calibration device for an optical motion capture camera.

[0021] In the diagram: 1. Calibration mechanism; 101. L-shaped seat; 102. Motor 1; 103. L-shaped calibration rod; 104. Static reflective cursor positioning; 105. Dynamic reflective cursor positioning; 2. Electric cylinder; 3. Moving seat; 4. Screw; 5. Motor 2; 6. Threaded seat; 7. Counterweight; 8. Fixing block; 9. Bolt hole; 10. Through hole; 11. Bolt. Detailed Implementation

[0022] The present disclosure will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the disclosure. Furthermore, it should be noted that, for ease of description, only the parts relevant to the present disclosure are shown in the accompanying drawings.

[0023] like Figure 1-5 As shown, a calibration device for an optical motion capture camera disclosed herein includes a calibration mechanism 1. The calibration mechanism 1 includes a stationary L-shaped calibration rod 103. A set of L-shaped static reflective calibration points 104 are installed on the L-shaped side of the L-shaped calibration rod 103. During static calibration, the static reflective calibration points 104 are first placed in a predetermined area and oriented toward the optical motion capture camera. The camera parameters are adjusted to ensure that all static reflective calibration points 104 are clearly imaged. Then, the static calibration process is executed to obtain static calibration parameters.

[0024] include Figures 1-3As shown, an L-shaped base 101 is provided on one side of the L-shaped calibration rod 103. A motor 102 with a drive end fixedly connected to the L-shaped calibration rod 103 is installed on the side of the L-shaped base 101. A set of evenly distributed dynamic reflective calibration points 105 are installed on the upper side of the L-shaped calibration rod 103. During dynamic calibration, the L-shaped calibration rod 103 is driven to rotate by the motor 102, so that the dynamic reflective calibration points 105 enter the predetermined area and face the camera. At the same time, the moving component drives the calibration mechanism 1 to move, and the optical motion capture camera synchronously captures all the dynamic reflective calibration points 105 on the L-shaped calibration rod 103 to complete the dynamic calibration and data acquisition, and obtain the dynamic calibration parameters.

[0025] Finally, a three-dimensional imaging model is constructed by iteratively calculating the static and dynamic calibration parameters.

[0026] The distribution positions of all static reflective cursor points 104 and dynamic reflective cursor points 105 are the same as those in the comparative files in the background art.

[0027] like Figure 1 , Figure 2 and Figure 4 As shown, a moving component is also provided below the calibration mechanism 1, which drives the calibration mechanism 1 to move for dynamic calibration.

[0028] like Figure 1 , Figure 2 and Figure 4 As shown, the moving component includes a moving base 3, with a strip groove on the upper side of the moving base 3. A screw 4 is rotatably installed in the strip groove. A motor 5 with a drive end connected to one end of the screw 4 is installed at one end of the moving base 3. A threaded seat 6 that is slidably connected to the inner wall of the strip groove is threaded onto the screw 4. The running motor 5 drives the screw 4 to rotate, and the rotating screw 4 drives the threaded seat 6 to move.

[0029] like Figure 2 As shown, a fixed block 8 is provided on the upper side of the threaded seat 6, and an electric cylinder 2 connected to the end of the telescopic arm and the L-shaped seat 101 is installed at the center of the upper side of the fixed block 8. The moving threaded seat 6 drives the calibration mechanism 1 to move laterally through the fixed block 8 and the electric cylinder 2.

[0030] like Figure 5 As shown, the upper side of the fixing block 8 has four rectangular through holes 10. The upper side of the threaded seat 6 has bolt holes 9 that are adapted to each through hole 10 directly below it. A bolt 11 is provided between the through holes 10 and the bolt holes 9 that are aligned with them. When not in use, the four bolts 11 can be unscrewed to disconnect the fixing block 8 from the threaded seat 6. This allows the calibration mechanism 1 to be separated from the moving component for easy transportation. Before use, the fixing block 8 can be re-fixed to the threaded seat 6 using the bolts 11 for reassembly.

[0031] like Figure 1 As shown, multiple evenly distributed counterweights 7 are installed on the side of the movable seat 3, which enhances the stability of the movable seat 3 when it is placed on the ground.

[0032] The working principle of this utility model: First, power on motor 102, motor 25 and electric cylinder 2. During static calibration, place the static reflective cursor 104 in the predetermined area and make it face the optical motion capture camera. Adjust the camera parameters to ensure that all static reflective cursors 104 are clearly imaged. Then, execute the static calibration process to obtain the static calibration parameters.

[0033] During dynamic calibration, motor 102 drives the L-shaped calibration rod 103 to rotate, causing the dynamic reflective calibration point 105 to enter the predetermined area and face the camera. At the same time, the moving component drives the calibration mechanism 1 to move, and the optical motion capture camera synchronously captures all the dynamic reflective calibration points 105 on the L-shaped calibration rod 103 to complete the dynamic calibration and data acquisition, obtain the dynamic calibration parameters, and finally, construct a three-dimensional imaging model by iteratively calculating the static calibration parameters and the dynamic calibration parameters.

[0034] Simultaneously, the motor 25 drives the screw 4 to rotate, and the rotating screw 4 drives the threaded seat 6 to move, thereby driving the calibration mechanism 1 to move through the electric cylinder 2. During dynamic calibration, the dynamic reflective calibration point 105 automatically moves laterally. At the same time, when the electric cylinder 2 extends and retracts, it can drive the calibration mechanism 1 to move longitudinally. This eliminates the need for manual operation by the staff and reduces their workload.

[0035] In the description of this specification, the references to terms such as "one embodiment / mode," "some embodiments / modes," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment / mode or example is included in at least one embodiment / mode or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment / mode or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments / modes or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments / modes or examples described in this specification, as well as the features of different embodiments / modes or examples.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0037] Those skilled in the art should understand that the above embodiments are merely for illustrating the present disclosure and are not intended to limit the scope of the disclosure. Those skilled in the art can make other changes or modifications based on the above disclosure, and these changes or modifications still fall within the scope of the present disclosure.

Claims

1. A calibration device for an optical motion capture camera, characterized in that: The system includes a calibration mechanism (1), which includes a stationary L-shaped base (101). A motor (102) is mounted on the side of the L-shaped base (101). An L-shaped calibration rod (103) is mounted on the drive end of the motor (102). A set of L-shaped static reflective cursor points (104) are mounted on the L-shaped side of the L-shaped calibration rod (103). A set of evenly distributed dynamic reflective cursor points (105) are mounted on the upper side of the L-shaped calibration rod (103). A moving component is also provided below the calibration mechanism (1), and the moving component drives the calibration mechanism (1) to move for dynamic calibration.

2. The calibration device for an optical motion capture camera according to claim 1, characterized in that, The movable component includes a movable base (3), and a strip groove is provided on the upper side of the movable base (3).

3. The calibration device for an optical motion capture camera according to claim 2, characterized in that, A screw (4) is rotatably installed inside the strip groove. A motor (5) with its drive end connected to one end of the screw (4) is installed at one end of the movable seat (3). A threaded seat (6) that is slidably connected to the inner wall of the strip groove is threaded onto the screw (4).

4. The calibration device for an optical motion capture camera according to claim 3, characterized in that, The upper side of the threaded seat (6) is provided with a matching fixing block (8), and the upper side of the fixing block (8) has four through holes (10) in a rectangular shape.

5. The calibration device for an optical motion capture camera according to claim 4, characterized in that, The threaded seat (6) has a bolt hole (9) that matches each through hole (10) on its upper side, and a bolt (11) is provided between the through hole (10) and the bolt hole (9) that is aligned with it.

6. The calibration device for an optical motion capture camera according to claim 4, characterized in that, An electric cylinder (2) is installed at the center of the upper side of the fixed block (8) and the end of the telescopic arm is connected to the L-shaped seat (101).

Images