XTDIC equipment-lens calibration auxiliary device

Abstract

The invention provides an XTDIC equipment-lens calibration auxiliary device, and belongs to the technical field of optical measurement. The device comprises a non-slip mat, a supporting plate, a supporting rod, a supporting platform and a clamping rod. The non-slip mat is adhered to the supporting plate, and the calibration plate is fixed through friction force; the supporting plate and the supporting rod can rotate freely under the condition that a certain external force is manually applied, and can be kept stable under the gravity of the calibration plate; the base is connected with the clamping rod through a linear guide rail structure, and front-back sliding of the supporting platform can be achieved. The lens calibration auxiliary equipment solves the problem that a single person is difficult to operate when a small-size calibration plate is used for calibrating a lens, and can effectively ensure that the calibration process is smoothly carried out.

Description

Technical Field

[0001] The invention relates to an XTD IC device-lens calibration auxiliary device, belonging to the technical field of optical measurement, and in particular to a camera calibration stage in a measurement process. Background Art

[0002] As a non-contact optical 3D measurement system, the XTDIC system is widely used in the measurement and analysis of displacement and strain of objects in the fields of material mechanics, biomechanics and high-speed deformation measurement. The XTDIC system mainly includes a measuring head, a support frame, a control box, a high-performance computer and XTDIC software. The detection process mainly includes measurement design, measurement preparation and experiment. The measurement preparation requires the measurement personnel to calibrate the measuring head.

[0003] Camera calibration refers to the process of allowing the system to obtain the internal and external parameters of the camera, which is the prerequisite for the system to perform accurate measurement and calculation. Camera calibration mainly involves capturing the image data of the calibration plate at a set distance through the camera, obtaining the three-dimensional coordinate data of each calibration point on the calibration plate, and calculating the internal and external parameters of the camera through an algorithm.

[0004] During the calibration process, it is necessary to collect image data of the calibration plate in the upward state at the measurement distance. For larger measurement samples, the calibration work can be completed using the large-sized calibration plate and the matching calibration plate bracket provided by the manufacturer; when measuring small-sized samples, a small-sized calibration plate is required. At this time, using the calibration plate bracket will block some reference points, thereby affecting the accuracy of camera calibration and even causing calibration failure.

[0005] In view of the above, designing a support frame suitable for small-sized calibration plates is beneficial for experimenters to calibrate cameras and can effectively ensure the accuracy of lens calibration. Summary of the invention

[0006] The purpose of the present invention is to provide an auxiliary support frame suitable for a small calibration plate, which aims to help experimenters to calibrate cameras more conveniently and quickly, avoid the difficulty of completing the camera calibration work alone when conducting experiments, and ensure the accuracy of camera calibration.

[0007] To achieve the above object, the present invention provides an XTD IC device-lens calibration auxiliary device, which mainly includes an anti-slip pad, a support plate, a support rod, a support platform and a clamping rod. The XTD IC device-lens calibration auxiliary device can freely adjust the angles of the support plate and the support rod to achieve different tilting angles of the calibration plate.

[0008] Wherein, the support plate is provided with an anti-skid pad to effectively prevent the calibration plate from sliding;

[0009] The support plate and the support rod, and the support rod and the base are fastened by screws and nuts, while the free rotation function between the parts is also retained, so that it has good support stability and rotation characteristics;

[0010] Wherein, the clamping rod can be clamped on the chuck of the universal tension and compression testing machine, so as to achieve the purpose of fixing the entire device;

[0011] Wherein, the support platform and the clamping rod are connected by a linear guide rail structure, so that the support platform can move forward and backward;

[0012] Wherein, the support platform is provided with a groove, which together with the anti-slip pad serves to limit the calibration plate;

[0013] Among them, the support plate, support rod, support platform and clamping rod are all 3D printed parts, and the material is PLA.

[0014] The advantages of this device are:

[0015] (1) Improving the stability of the calibration plate when tilted upward: clamping the cylindrical end of the clamping rod on the chuck of the universal tension and compression testing machine effectively ensures the stability of the XTDIC device-lens calibration auxiliary device during use;

[0016] (2) Meeting the multi-angle adjustment requirements: The support plate and the support rod can achieve multi-angle rotation when a certain external force is applied, meeting the multi-angle adjustment requirements of the calibration plate;

[0017] (3) Simple and convenient: The XTDIC device-lens calibration auxiliary device is composed of a simple mechanical structure, and the use process is simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to better illustrate the use method and technical solution of the present invention, a brief description of the drawings will be made in combination with the embodiments and related technical solutions.

[0019] Figure 1 It is a structural schematic diagram of the present invention;

[0020] Figure 2 It is a right side view of the present invention;

[0021] Figure 3 It is a rear view of the present invention.

[0022] 1- calibration plate, 2- anti-slip pad, 3- support plate, 4- support frame, 5- support platform, 6- clamping rod. DETAILED DESCRIPTION

[0023] In order to better describe the use and technical solution of the present invention, the following will introduce Figure 1 -3 and embodiments describe the use process of the present invention in detail. The following descriptions are all exemplary in nature and are intended to illustrate the present invention rather than to limit the present invention.

[0024] The present invention designs an XTDI C device - a lens calibration auxiliary device. For the use of this embodiment, please refer to Figure 1 , Figure 2 as well as Figure 3 , the picture includes the following 6 parts: 1-calibration plate, 2-anti-slip pad, 3-support plate, 4-support frame, 5-support platform, 6-clamping rod.

[0025] The specific steps are as follows:

[0026] Step 1: Clamp the 6-clamping rod of the XTD IC device-lens calibration auxiliary device onto the chuck of the universal tension and compression testing machine, so that the lower end surface of the 5-support platform coincides with the lower chuck end surface of the universal tension and compression testing machine;

[0027] Step 2: Adjust the angles of the 3-support plate and the 4-support frame to meet the test requirements;

[0028] Step 3: Place 1-calibration plate on 2-anti-slip pad;

[0029] Step 4: Fine-tune the angle of the 3-support plate so that the lower edge of the 1-calibration plate is stuck in the groove of the 5-support platform;

[0030] Step 5: Adjust the front and rear position of the 5-support platform so that the horizontal center axis of the 1-calibration plate and the axis of the 6-clamping rod are in the same vertical plane, so as to realize the pitching movement of the 1-calibration plate at the reference standard distance;

[0031] Step 6: Start the lens calibration work under this step;

[0032] Step 7: Loosen the chuck of the universal tension and compression testing machine and remove the device and the calibration plate;

[0033] Step 8: Place the calibration plate on the end face of the lower chuck of the universal tension and compression testing machine and start the subsequent calibration work.

[0034] The above disclosure is only a preferred embodiment of the present invention, and it is certainly not used to limit the scope of the present invention. A person skilled in the art can understand that all or part of the processes of the above embodiment and the equivalent changes made according to the claims of the present invention still fall within the scope of the invention. At the same time, it should be understood that the words or phrases with the meaning of indicating the direction or position mentioned in the above embodiment are only for the convenience of describing the present invention.

Claims

1. The XTDIC device-lens calibration auxiliary device is characterized in that it is composed of an anti-slip pad, a support plate, a support rod, a support platform and a clamping rod. The XTDIC device-lens calibration auxiliary device can freely adjust the angles of the support plate and the support rod to meet the adjustment requirements at different angles.

2. The XTDIC device-lens calibration auxiliary device according to claim 1, characterized in that: The support plate is affixed with an anti-skid pad, which can effectively prevent the calibration plate from sliding.

3. The XTDIC device-lens calibration auxiliary device as claimed in claim 1, characterized in that: The support plate and the support rod, and the support rod and the base are fastened by screws and nuts, so that each component has good supporting stability and each component can rotate freely to meet the adjustment requirements of different angles.

4. The XTDIC device-lens calibration auxiliary device as claimed in claim 1, characterized in that: The clamping rod is used to be clamped on the chuck of the universal tension and compression testing machine to achieve the purpose of fixing the entire device.

5. The XTDIC device-lens calibration auxiliary device as claimed in claim 1, characterized in that: The support platform and the clamping rod are connected via a linear guide rail structure to achieve the forward and backward movement characteristics of the support platform.

6. The XTDIC device-lens calibration auxiliary device as claimed in claim 1, characterized in that: The support platform is provided with a groove, and when in use, the edge of the calibration plate is stuck into the bottom of the groove, which plays a certain anti-slip and limiting role.

7. The XTDIC device-lens calibration auxiliary device as claimed in claim 1, characterized in that: The support plate, support rod, support platform and clamping rod are all 3D printed parts made of PLA.

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