Optical calibration plate for visual inspection

Abstract

The utility model relates to machine vision detection technical field provides an optical calibration board for vision detection, including square glass substrate, the glass substrate is equipped with round calibration unit and square calibration unit and is arrayed distribution, the round calibration unit and square calibration unit even intercalate distribution between, the glass substrate four perimeter side is equipped with scale line mark and is used for the azimuth identifier of azimuth identification, glass substrate is not easy to deform, can long -term keep standard form, the glass substrate is equipped with round calibration unit and square calibration unit and is arrayed distribution, and the glass substrate four perimeter side is equipped with scale line mark and azimuth identifier, to meet the demand of multi -parameter calibration, and the glass substrate is square setting, the round calibration unit and square calibration unit on glass substrate are completely symmetrical setting between, no matter how glass substrate is placed does not influence calibration result, to improve operational flexibility greatly.

Description

Technical Field

[0001] This utility model relates to the field of machine vision inspection technology, specifically an optical calibration plate for visual inspection. Background Technology

[0002] In the field of machine vision inspection technology, optical calibration boards are the core tools for camera calibration and vision system calibration. Their accuracy and adaptability directly affect the reliability of vision measurement results.

[0003] Currently, optical calibration plates are mostly made of metal or acrylic. While metal calibration plates have a certain strength, they are easily deformed by changes in ambient temperature and humidity, affecting calibration accuracy. Acrylic calibration plates, although lower in cost, are relatively soft and prone to scratches, bending, and other deformations under long-term use or improper operation, affecting the accuracy of calibration results. In addition, existing publicly available standard calibration plates have limited functionality. Circular array plates only contain circular patterns and cannot provide the corner features of a checkerboard pattern. Checkerboard plates only have a checkerboard pattern and lack circular features. They lack multi-element composite designs and cannot meet the needs of multi-parameter calibration. Furthermore, the pattern layout of calibration plates is usually directional, and there are directional requirements when placing them, which limits the flexibility of operation.

[0004] Therefore, this invention proposes an optical calibration plate for visual inspection to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide an optical calibration plate for visual inspection to solve the above-mentioned problems.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] An optical calibration plate for visual inspection includes a square glass substrate. Circular calibration units and square calibration units are arranged in an array on the glass substrate, and the circular and square calibration units are evenly interspersed among each other. The four sides of the glass substrate are provided with scale lines and orientation identifiers for orientation identification.

[0008] In one alternative: the glass substrate has a size of 350mm × 350mm.

[0009] In one alternative: the diameter of the circular calibration unit is 0.25 mm, and the center distance between two adjacent circular calibration units is 0.5 mm.

[0010] In one alternative: the square calibration unit has a size of 1.5mm × 1.5mm.

[0011] In one alternative: the scale mark is 340 mm long.

[0012] In one alternative: the orientation identifier consists of 26 different English letters arranged along the edge of the glass substrate, and the height of each English letter is 1 mm.

[0013] In one alternative: the glass substrate is provided with Mark positioning dots at the four corners.

[0014] In one alternative: the diameter of the Mark positioning dot is 2mm.

[0015] In one alternative: the glass substrate is further provided with edge black lines for achieving automatic image correction.

[0016] Compared with the prior art, the beneficial effects of this utility model embodiment are as follows:

[0017] The glass substrate is not easily deformed and can maintain its standard shape for a long time, thus ensuring calibration accuracy. Circular and square calibration units are arrayed on the glass substrate, and scale lines and orientation identifiers are provided on the four sides of the glass substrate to meet the requirements of multi-parameter calibration. Furthermore, the glass substrate is square, and the circular and square calibration units on the glass substrate are completely symmetrically arranged. No matter how the glass substrate is placed, it will not affect the calibration results, thus greatly improving operational flexibility.

[0018] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. Furthermore, these drawings and textual descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concepts of this application to those skilled in the art through reference to specific embodiments.

[0020] Figure 1 This is a front view of an embodiment of the present utility model.

[0021] Figure 2 for Figure 1 Enlarged view of point A in the middle.

[0022] Figure label annotations: 1-glass substrate, 2-circular calibration unit, 3-square calibration unit, 4-scale line marking, 5-Mark positioning dot, 6-position identifier, 7-black edge line. Detailed Implementation

[0023] The present application will now be described in further detail with reference to the accompanying drawings. It should be noted that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the scope of protection of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application based on the above application content.

[0024] Please see Figure 1 and Figure 2 An optical calibration plate for visual inspection includes a square glass substrate 1 (preferably made of tempered glass). Circular calibration units 2 and square calibration units 3 are arrayed on the glass substrate 1, and the circular calibration units 2 and square calibration units 3 are evenly interspersed. The four sides of the glass substrate 1 are provided with scale lines 4 and orientation identifiers 6 for orientation identification. It should be noted that the circular calibration units 2 and square calibration units 3 are completely symmetrically arranged, and the scale lines 4 and orientation identifiers 6 on opposite sides of the glass substrate 1 are centrally symmetrically arranged.

[0025] The glass substrate 1 is not easily deformed and can maintain its standard shape for a long time, thus ensuring calibration accuracy. The glass substrate 1 is arrayed with circular calibration units 2 and square calibration units 3 (the square calibration units 3 achieve sub-pixel level calibration). The four sides of the glass substrate 1 are provided with scale line marks 4 and orientation identifiers 6 for orientation recognition (the orientation identifiers 6 support OCR (Optical Character Recognition) automatic orientation recognition), thus meeting the requirements of multi-parameter calibration. Furthermore, the glass substrate 1 is square, and the circular calibration units 2 and square calibration units 3 on the glass substrate 1 are completely symmetrically arranged. No matter how the glass substrate 1 is placed (meaning that either side of the glass substrate 1 is placed against the reference surface), it will not affect the calibration results, thus greatly improving operational flexibility.

[0026] Furthermore, the glass substrate 1 has a size of 350mm × 350mm.

[0027] Furthermore, the diameter of the circular calibration unit 2 is 0.25 mm, and the center distance between two adjacent circular calibration units 2 is 0.5 mm.

[0028] Furthermore, the square calibration unit 3 has a size of 1.5mm × 1.5mm.

[0029] Furthermore, the length of the scale line marking 4 is 340mm.

[0030] Furthermore, the orientation identifier 6 consists of 26 different English letters arranged along the side of the glass substrate 1, and the height of each English letter is 1 mm.

[0031] Furthermore, the glass substrate 1 is also provided with edge black lines 7 for achieving automatic image correction.

[0032] Please see Figure 2 In one embodiment of the present invention, the glass substrate 1 is provided with Mark positioning dots 5 at the four corners, and the diameter of the Mark positioning dots 5 is 2mm.

[0033] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An optical calibration plate for visual inspection, characterized in that, The glass substrate (1) is square. Circular calibration units (2) and square calibration units (3) are arranged in an array on the glass substrate (1). The circular calibration units (2) and square calibration units (3) are evenly interspersed. The glass substrate (1) has scale line markings (4) and orientation identifiers (6) for orientation identification on its four periphery.

2. The optical calibration plate for visual inspection according to claim 1, characterized in that, The glass substrate (1) has a size of 350mm × 350mm.

3. The optical calibration plate for visual inspection according to claim 1, characterized in that, The diameter of the circular calibration unit (2) is 0.25 mm, and the center distance between two adjacent circular calibration units (2) is 0.5 mm.

4. The optical calibration plate for visual inspection according to claim 1, characterized in that, The square calibration unit (3) has a size of 1.5mm × 1.5mm.

5. The optical calibration plate for visual inspection according to claim 1, characterized in that, The length of the scale mark (4) is 340mm.

6. The optical calibration plate for visual inspection according to claim 1, characterized in that, The orientation identifier (6) consists of 26 different English letters arranged along the side of the glass substrate (1), and the height of each English letter is 1 mm.

7. The optical calibration plate for visual inspection according to claim 1, characterized in that, The glass substrate (1) has Mark positioning dots (5) at its four corners.

8. The optical calibration plate for visual inspection according to claim 7, characterized in that, The diameter of the Mark positioning dot (5) is 2mm.

9. The optical calibration plate for visual inspection according to claim 1, characterized in that, The glass substrate (1) is also provided with edge black lines (7) for automatic image correction.

Images