Reliable calibration plate for three-dimensional scanning
By designing the calibration plate of the substrate, backplate and angle adjustment bracket, the problems of difficulty in adjusting the angle and insufficient reliability of the existing calibration plate are solved, and a higher accuracy and more stable three-dimensional scanning effect is achieved.
Patent Information
- Application Number
- CN202422285077.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-18
- Publication Date
- 2025-07-04
- Estimated Expiration
- 2034-09-18
AI Technical Summary
Existing calibration plates are difficult to adjust the fixed angle, have low structural reliability, and are prone to defects in calibration accuracy, making it difficult to meet the needs of three-dimensional scanning application scenarios with higher accuracy and higher quality.
A calibration plate including a substrate, a back plate, an angle adjustment bracket and an outer frame is designed. The substrate and the back plate are flexibly fixed through the groove structure, and combined with the angle adjustment bracket, the calibration plate is stabilized and fixed at different angles, avoid stress generation, and improve structural stability and calibration accuracy.
It ensures the stable fixation of the calibration plate at different angles, avoids damage caused by stress and accuracy errors, and meets the needs of three-dimensional scanning applications with higher accuracy and higher quality.
Smart Images
Figure CN223064570U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of three-dimensional scanning, in particular to a reliable calibration board for three-dimensional scanning. Background Art
[0002] Calibration Targets are widely used in applications such as machine vision, image measurement, photogrammetry, and three-dimensional reconstruction. To correct lens distortion, determine the conversion relationship between physical dimensions and pixels, and determine the mutual relationship between the three-dimensional geometric position of a certain point on the surface of a spatial object and its corresponding point in the image, it is necessary to establish a camera imaging geometric model for three-dimensional scanning. By photographing a flat plate with a pattern array of fixed spacing, the geometric model of the camera can be obtained through the calculation of calibration algorithms, thereby obtaining high-precision three-dimensional scanning measurement and reconstruction results.
[0003] The flat plate with a pattern array of fixed spacing is the calibration board. Existing calibration boards are generally of checkerboard structure or circular dot matrix structure. When extracting the corner points on the checkerboard, the edge top plate of the checkerboard structure is used. However, such calibration boards are generally difficult to adjust and fix the angle, and the glass substrate results in low structural reliability, and the calibration accuracy is also prone to defects, making it difficult to meet the requirements of higher-precision and higher-quality three-dimensional scanning application scenarios. There is an urgent need for a new reliable calibration board.
[0004] In the process of implementing the present utility model, the applicant found that there are at least the following problems in the prior art:
[0005] Existing calibration boards are generally difficult to adjust and fix the angle, have low structural reliability, and the calibration accuracy is also prone to defects, making it difficult to meet the requirements of higher-precision and higher-quality three-dimensional scanning application scenarios. Summary of the Utility Model
[0006] The purpose of the present utility model is to provide a reliable calibration board for three-dimensional scanning, so as to solve the technical problems existing in the prior art that calibration boards are generally difficult to fix a specific angle, have low structural reliability, and the calibration accuracy is also prone to defects, making it difficult to meet the requirements of higher-precision and higher-quality three-dimensional scanning application scenarios. The many technical effects that can be produced by the preferred technical solutions provided by the present utility model are described in detail below.
[0007] To achieve the above purpose, the present utility model provides the following technical solutions:
[0008] A reliable calibration plate for three-dimensional scanning provided by the present utility model includes a substrate, a back plate, an angle adjustment bracket and an outer frame; the substrate and the back plate are arranged opposite to each other, a calibration pattern is arranged on the substrate, and the back plate is fixedly connected with the angle adjustment bracket; the outer frame flexibly fixes the substrate and the back plate through a groove structure; the angle adjustment bracket is used to adjust the placement angle of the calibration plate so that the calibration plate can be placed and fixed at different angles.
[0009] Preferably, the angle adjustment bracket includes a fixing part, an adjusting part and a supporting part connected in sequence. The fixing part is connected with the back plate. The adjusting part is used to adjust the placement angle of the calibration plate, and the supporting part is used to fix the calibration plate.
[0010] Preferably, the fixing part and the adjusting part are connected by a first pivot, and the adjusting part and the supporting part are connected by a second pivot.
[0011] Preferably, the fixing part, the adjusting part and the supporting part are all regular polygon structures with the same number of sides, and the radii of the regular polygon structures increase in sequence.
[0012] Preferably, the first pivot and the second pivot are arranged opposite to each other and are located on the sides of the regular polygon.
[0013] Preferably, the fixing part is a flat plate structure, and the adjusting part and the supporting part are hollow structures.
[0014] Preferably, a buffer pad is arranged between the substrate and the outer frame, and the buffer pad is fixed on the peripheral side of the substrate.
[0015] Preferably, an encapsulating layer is arranged between the back plate and the outer frame.
[0016] Preferably, the outer frame includes 4 side frames, and adjacent side frames are fixedly connected.
[0017] Implementing one of the above technical solutions of the present utility model has the following advantages or beneficial effects:
[0018] In the present application, the outer frame of the calibration plate flexibly fixes the substrate and the back plate through a groove structure to achieve the purpose of buffering. The frame avoids the stress caused by the inclined placement of the calibration plate, logistics transportation, etc., and also avoids the damage of the glass substrate caused by bumping, falling and transportation. Therefore, the structure of the calibration plate is more stable and reliable, effectively ensuring the calibration accuracy. At the same time, the calibration plate can be placed and fixed at different angles through the angle adjustment bracket, with stronger adaptability, better meeting the requirements of higher-precision and higher-quality three-dimensional scanning application scenarios. Description of the Drawings
[0019] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings. In the drawings:
[0020] Figure 1 is a schematic structural diagram of a reliable calibration board for three-dimensional scanning according to an embodiment of the present utility model Figure 1 ;
[0021] Figure 2 is a schematic structural diagram of a reliable calibration board for three-dimensional scanning according to an embodiment of the present utility model Figure 2 ;
[0022] Figure 3 is a schematic structural diagram of a reliable calibration board for three-dimensional scanning according to an embodiment of the present utility model Figure 3 ;
[0023] Figure 4 is a schematic structural diagram of a reliable calibration board for three-dimensional scanning according to an embodiment of the present utility model Figure 4 ;
[0024] Figure 5 is a schematic structural diagram of an angle adjustment bracket in an embodiment of the present utility model;
[0025] In the figure: 1, substrate; 2, back plate; 3, angle adjustment bracket; 31, fixing part; 32, adjusting part; 33, supporting part; 34, first pivot; 35, second pivot; 4, outer frame. Detailed implementation manners
[0026] In order to make the purpose, technical solutions and advantages of the present utility model clearer and more understandable, the various exemplary embodiments to be described below will refer to the corresponding drawings, which form a part of the exemplary embodiments and describe various exemplary embodiments that may be adopted to implement the present utility model. Unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with the present disclosure.
[0027] In the description of the present utility model, it should be understood that the meaning of the term "a plurality of" is two or more. The terms "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a communication connection, a direct connection, or an indirect connection through an intermediate medium. It may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0028] In order to illustrate the technical solutions described in the present utility model, the following will be described by means of specific embodiments, and only the parts related to the embodiments of the present utility model are shown.
[0029] Embodiment:
[0030] As Figures 1 - 4 shown, the present utility model provides a reliable calibration board for three-dimensional scanning, including a substrate 1, a backboard 2, an angle adjustment bracket 3 and an outer frame 4; the substrate 1 and the backboard 2 are arranged opposite to each other, that is, on the front and back sides of the calibration board. A calibration pattern is provided on the substrate 1, and the calibration pattern is a checkerboard structure or a circular dot matrix structure. The backboard 2 is fixedly connected to the angle adjustment bracket 3, so that the angle of the entire calibration board can be adjusted through the angle adjustment bracket 3; the outer frame 4 flexibly fixes the substrate 1 and the backboard 2 through a groove structure. The flexible fixation not only avoids the stress generated by the use of a glass substrate, which easily causes deformation of the calibration board and errors, but also avoids the stress generated during assembly when the outer frame 4 is directly and rigidly fixed to the substrate 1, affecting the accuracy of the calibration board. Therefore, the calibration board has higher accuracy in the X, Y, and Z axis directions, and the structure of the calibration board is more stable and reliable. The angle adjustment bracket 3 is used to adjust the placement angle of the calibration board, so that the calibration board can be placed and fixed at different angles, such as Figure 2 , Figure 3 shown, the angle adjustment bracket 3 can support and fix the entire calibration board at different angles with the ground and the like, so as to adapt to three-dimensional scanning in different scenarios, with stronger adaptability. In this embodiment, the outer frame flexibly fixes the substrate and the backboard through a groove structure to achieve the purpose of buffering. The framed structure avoids the stress generated by reasons such as the inclined placement of the calibration board and logistics transportation, and also avoids the damage caused by the collision, fall and transportation of the glass substrate. Therefore, the structure of the calibration board is more stable and reliable, effectively ensuring the calibration accuracy. At the same time, through the angle adjustment bracket, the calibration board can be placed and fixed at different angles, with stronger adaptability, better meeting the requirements of three-dimensional scanning application scenarios with higher accuracy and higher quality.
[0031] As an alternative embodiment, the angle adjustment bracket 3 includes a fixing portion 31, an adjusting portion 32, and a supporting portion 33 that are sequentially connected. The fixing portion 31 is connected to the back plate 2 to fix the entire angle adjustment bracket 3 to the back plate 2. The adjusting portion 32 is used to adjust the placement angle of the calibration plate, and the supporting portion 33 is used to fix the calibration plate, that is, to abut against the ground or the like to support and fix the entire calibration plate.
[0032] As an alternative embodiment, as Figure 5 shown, the fixing portion 31 and the adjusting portion 32 are connected by a first pivot 34. Thus, after the fixing portion 31 is fixed, the adjusting portion 32 adjusts the angle with the fixing portion through the first pivot 34 to realize the angle adjustment between the angle adjustment bracket 3 and the back plate. The adjusting portion 32 and the supporting portion 33 are connected by a second pivot 35, and the supporting and fixing angle between the entire angle adjustment bracket 3 and the ground or the like can be adjusted through the second pivot 35. The angle adjustment operations of the first pivot 34 and the second pivot 35 are simple and convenient, the angle adjustment range is large, and the structural stability is strong and the supportability is good. Preferably, the clearance between the rotating shaft and the shaft sleeve in the first pivot 34 and the second pivot 35 is a clearance fit, but the clearance is small, and the specific value range can be configured according to needs. Thus, the first pivot 34 and the second pivot 35 can rotate to realize the angle adjustment between the fixing portion 31, the adjusting portion 32, and the supporting portion 33. At the same time, the angle adjustment bracket 3 can effectively support the weight of the entire calibration plate at any angle, avoiding unstable support due to a large clearance. The first pivot 34 and the second pivot 35 are oppositely arranged and located on the sides of a regular polygon. Being located on the sides of a regular polygon is convenient for the arrangement of the first pivot 34 and the second pivot 35, and the opposite arrangement is convenient for unfolding or storing the entire angle adjustment bracket 3, making the structure of the entire angle adjustment bracket 3 more compact.
[0033] As an alternative embodiment, as Figure 5 shown, the fixing portion 31, the adjusting portion 32, and the supporting portion 33 are all regular polygon structures with the same number of sides, and the radii increase sequentially (that is, the radii of the regular polygons corresponding to the fixing portion 31, the adjusting portion 32, and the supporting portion 33 increase sequentially). In this embodiment, it is a regular octagon structure. Of course, it can also be set as a regular polygon with other numbers of sides according to needs, such as a regular hexagon, a regular heptagon, etc. The fixing portion 31 is a flat plate structure, and the flat plate structure is convenient for connecting and fixing the fixing portion to the back plate 2. The fixing method can be adhesive bonding, screw connection, etc. The adjusting portion 32 and the supporting portion 33 are hollow structures, so that it is convenient for the adjusting portion 32 and the supporting portion 33 to be stored outside the adjusting portion 32. The shape of the angle adjustment bracket 3 after storage is as Figure 4 shown. At this time, the entire calibration plate can be stored more conveniently and occupies less space.
[0034] As an alternative embodiment, a buffer pad is provided between the substrate 1 and the outer frame 4. The buffer pad is fixed to the peripheral side of the substrate 1. By providing the buffer pad, the connection between the substrate 1 and the frame 4 is more firm, and the purpose of flexible fixation between the substrate 1 and the outer frame 4 is achieved. It avoids the stress generated between the outer frame 4 and the substrate 1, which may cause calibration plate errors, and also avoids the structural damage of the calibration plate. A potting layer is provided between the backplane 2 and the outer frame 4. The potting layer is convenient to implement and the operation is simple. It also realizes the flexible connection between the backplane 2 and the outer frame 4, and facilitates the more firm fixation between the backplane 2 and the outer frame 4, further improving the structural strength and accuracy of the calibration plate.
[0035] As an alternative embodiment, the outer frame 4 includes 4 frames, and adjacent frames are fixedly connected. Preferably, they are screw-connected through a connecting member. The connecting member is L-shaped and fixed in the groove of the adjacent frames. By using screws to connect the L-shaped connecting member with two adjacent frames, the fixation of the adjacent frames can be achieved. The installation operation is convenient, and it avoids the stress generated by snap fixation, which may affect the stability of the entire calibration plate structure.
[0036] The embodiment is only a special case and does not indicate that the present utility model has only such an implementation manner.
[0037] The above are only the preferred embodiments of the present utility model. Those skilled in the art know that without departing from the spirit and scope of the present utility model, various changes or equivalent replacements can be made to these features and embodiments. Additionally, under the teaching of the present utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the protection scope of the present utility model.
Claims
1. A reliable calibration plate for three-dimensional scanning, characterized in that, It includes a substrate, a back plate, an angle adjustment bracket and an outer frame; the substrate and the back plate are arranged opposite to each other, a calibration pattern is provided on the substrate, and the back plate is fixedly connected to the angle adjustment bracket; the outer frame flexibly fixes the substrate and the back plate through a groove structure; the angle adjustment bracket is used to adjust the placement angle of the calibration plate so that the calibration plate can be placed and fixed at different angles.
2. The reliable calibration plate for three-dimensional scanning according to claim 1, characterized in that, The angle adjustment bracket includes a fixing part, an adjusting part and a supporting part connected in sequence. The fixing part is connected to the back plate. The adjusting part is used to adjust the placement angle of the calibration plate, and the supporting part is used to fix the calibration plate.
3. A reliable calibration plate for three-dimensional scanning according to claim 2, characterized in that, The fixing part and the adjusting part are connected by a first pivot, and the adjusting part and the supporting part are connected by a second pivot.
4. A reliable calibration plate for three-dimensional scanning according to claim 3, wherein, The fixing part, the adjusting part and the supporting part are all regular polygon structures with the same number of sides, and the radii of the regular polygon structures increase in sequence.
5. A reliable calibration plate for three-dimensional scanning according to claim 4, wherein, The first pivot and the second pivot are arranged opposite to each other and are located on the sides of the regular polygon.
6. The reliable calibration plate for three-dimensional scanning according to claim 5, characterized in that, The fixing part is a flat plate structure, and the adjusting part and the supporting part are hollow structures.
7. A reliable calibration plate for three-dimensional scanning according to claim 1, characterized in that, A buffer pad is arranged between the substrate and the outer frame, and the buffer pad is fixed on the peripheral side of the substrate.
8. A reliable calibration plate for three-dimensional scanning according to claim 7, characterized in that, An encapsulating layer is arranged between the back plate and the outer frame.
9. A reliable calibration plate for three-dimensional scanning according to claim 1, characterized in that, The outer frame includes 4 side frames, and the adjacent side frames are fixedly connected.