Calibration device

Abstract

The embodiment of the utility model relates to the technical field of optical detection, in particular to a calibration device which comprises an installation box, a transparent calibration plate and a light source are arranged in the installation box, the light source is arranged at the lower end of the transparent calibration plate, and the transparent calibration plate comprises a calibration array composed of a plurality of non-transparent calibration blocks. A positioning block is arranged at the center of the calibration array, and the shape of the positioning block is different from that of the surrounding calibration blocks. According to the embodiment of the utility model, the positioning blocks are arranged at the center of the calibration array of the transparent calibration plate, so that when the calibration device is used for detecting the object to be detected, the relative positions of the main camera and other side cameras can be accurately determined according to the positions of the positioning blocks in the calibration photo obtained by shooting, and the specific surface of the object to be detected can be identified; and the detection accuracy and the use experience are improved.

Description

Technical Field

[0001] The embodiments of the present utility model relate to the technical field of optical detection, and in particular to a calibration device. Background Art

[0002] Most of the optical imaging modules of current AOI devices (optical detection devices) adopt the configuration of a single top camera to inspect the objects to be detected on the bottom track. However, there are some scenarios where the top camera alone cannot meet the detection requirements. For example, it is necessary to detect the vertical or inwardly inclined side wall surfaces of an object, and there are obstacles blocking above the object. In these cases, several other tilted Scheimpflug cameras need to be used to take pictures from the side to obtain information that cannot be obtained by the top main camera. Due to the special optical path of the Scheimpflug lens, a rectangular object originally arranged horizontally will appear trapezoidal in its image. Therefore, a dot matrix calibration mechanism is required to correct its camera field of view back to a normal rectangle.

[0003] The existing calibration mechanism for the Scheimpflug lens camera field of view correction algorithm is a transparent glass plate, on which M*N opaque black dots of the same size are arranged in an array. However, after the main camera and each side camera take pictures, only a dot matrix composed of black dots of exactly the same shape and size can be seen in their fields of view, and the relative position relationship between the main camera and each side camera cannot be known from the pictures. In the later detection link, since the relative position relationship between the main camera and each side camera cannot be known, the defect positions detected in the main camera cannot be associated with the defect positions detected in the side cameras. For example: when a user wants to detect whether there are defects on the vertical side wall of a component in the field of view of the main camera, at this time, the user detects multiple vertical side walls in the side camera, but the user cannot tell which side wall is the side wall of the component detected in the field of view of the main camera. It can be seen that when using the calibration structure to detect components in the related art, due to the relative position between the main camera and the side camera being unable to be determined, the specific surface of the component cannot be recognized, which may lead to detection errors and poor user experience. Summary of the Utility Model

[0004] In view of this, one of the purposes of the embodiments of the present utility model is to provide a calibration device, aiming to solve the technical problem in the prior art that the specific surface of a component cannot be recognized due to the relative position between the main camera and the side camera being unable to be determined.

[0005] To solve the above technical problems, the embodiments of the present utility model provide the following technical solutions:

[0006] In a first aspect, the embodiments of the present utility model provide a calibration device, including:

[0007] Installation box, a transparent calibration plate and a light source are arranged in the installation box, and the light source is arranged at the lower end of the transparent calibration plate;

[0008] The transparent calibration plate includes a calibration array composed of a plurality of opaque calibration blocks. A positioning block is arranged at the center of the calibration array, and the shape of the positioning block is different from that of the surrounding calibration blocks.

[0009] In some embodiments, the number of rows of the calibration array is set to M, and the number of columns is set to N.

[0010] When both the number of rows M and the number of columns N are odd, the center of the calibration array is arranged at the (M + 1) / 2-th row and the (N + 1) / 2-th column of the calibration array;

[0011] When both the number of rows M and the number of columns N are even, the center of the calibration array is arranged at the M / 2-th row and the N / 2-th column of the calibration array;

[0012] When the number of rows M is odd and the number of columns N is even, the center of the calibration array is arranged at the (M + 1) / 2-th row and the N / 2-th column of the calibration array;

[0013] When the number of rows M is even and the number of columns N is odd, the center of the calibration array is arranged at the M / 2-th row and the (N + 1) / 2-th column of the calibration array.

[0014] In some embodiments, a light guide plate is further arranged in the installation box, and the light guide plate is arranged between the light source and the transparent calibration plate.

[0015] In some embodiments, the shape of the calibration blocks in the calibration array is set to be circular, the shape of the positioning block is set to be annular, the outer diameter of the positioning block is the same as the diameter of the calibration block, and the inner diameter of the positioning block is smaller than the diameter of the calibration block.

[0016] In some embodiments, the installation box includes a box body and a box cover;

[0017] The box cover is arranged at one end of the opening of the box body, and the transparent calibration plate and the light source are arranged in the box body.

[0018] In some embodiments, the box cover includes a connecting portion and a switching portion;

[0019] One end of the connecting portion is fixed to the peripheral side of the upper surface of the opening of the box body;

[0020] The switching portion is set as two parallel long strip guide rails and a sliding cover. The long strip guide rails are fixed at one end of the connecting portion away from the box body and are arranged oppositely, and the sliding cover is slidably arranged between the long strip guide rails.

[0021] In some embodiments, sliding grooves are respectively formed on opposite sides of the long guide rail, and both sides of the sliding cover are configured in a shape adapted to the sliding grooves.

[0022] In some embodiments, ball screws are respectively arranged at both ends of the long guide rail in the moving direction of the sliding cover, and pits are respectively formed on both sides of the sliding cover corresponding to the ball screws.

[0023] In some embodiments, a pulling groove is provided on the sliding cover.

[0024] In some embodiments, a wire hole is formed in the side end of the mounting box, and the wire of the light source is threaded through the wire hole.

[0025] The embodiment of the present utility model has the following beneficial effects: Different from the prior art, the calibration device provided by the embodiment of the present utility model includes: a mounting box, a transparent calibration plate and a light source are arranged in the mounting box, the light source is arranged at the lower end of the transparent calibration plate, the transparent calibration plate includes a calibration array composed of a plurality of opaque calibration blocks, a positioning block is arranged at the center of the calibration array, and the shape of the positioning block is different from that of the surrounding calibration blocks.

[0026] In the embodiment of the present utility model, by arranging a positioning block at the center of the calibration array of the transparent calibration plate, when using the calibration device to detect a to-be-detected item, the relative positions of the main camera and other side cameras can be accurately determined according to the position of the positioning block in the calibration photo obtained by shooting, and the specific surface of the to-be-detected item can be recognized, thereby improving the detection accuracy and user experience. Description of the Drawings

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following-described drawings only show some embodiments of the present utility model, and thus should not be regarded as limiting the protection scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0028] Figure 1 is a schematic assembly structure diagram of the calibration device provided by some embodiments of the present utility model;

[0029] Figure 2a is a schematic disassembly and assembly structure diagram of the calibration device provided by some embodiments of the present utility model;

[0030] Figure 2b is a schematic distribution diagram of the calibration blocks and the positioning block in the calibration array of the transparent calibration plate provided by some embodiments of the present utility model;

[0031] Figure 2cSchematic diagram of the shape of the positioning block of the calibration array in some embodiments of the present utility model;

[0032] Figure 2d Schematic diagram of the shape of the positioning block of the calibration array in some other embodiments of the present utility model;

[0033] Figure 3 Schematic diagram of the shape of the positioning block of the calibration array in some further embodiments of the present utility model;

[0034] Figure 4a Schematic diagram of setting the center of the calibration array in some embodiments of the present utility model;

[0035] Figure 4b Schematic diagram of setting the center of the calibration array in some other embodiments of the present utility model;

[0036] Figure 4c Schematic diagram of setting the center of the calibration array in some further embodiments of the present utility model;

[0037] Figure 4d Schematic diagram of setting the center of the calibration array in some still further embodiments of the present utility model;

[0038] Figure 5 Another disassembly and assembly structure schematic diagram of the calibration device provided in some embodiments of the present utility model;

[0039] Figure 6 Another disassembly and assembly structure schematic diagram of the calibration device provided in some embodiments of the present utility model;

[0040] Figure 7 Another disassembly and assembly structure schematic diagram of the calibration device provided in some embodiments of the present utility model;

[0041] Figure 8 Is Figure 6 Enlarged view of part A of the disassembly and assembly structure of the calibration device shown in the embodiment;

[0042] Figure 9 Is Figure 2a Enlarged view of part B of the disassembly and assembly structure of the calibration device shown in the embodiment.

[0043] Explanation of reference numerals:

[0044] 100, calibration device;

[0045] 10, installation box; 11, box body; 12, box cover; 121, connecting part; 122, switch part; 1221, long strip guide rail; 12211, chute; 12212, ball screw; 1222, sliding cover; 12221, convex strip; 12222, concave pit; 12223, pulling groove;

[0046] 20. Transparent calibration plate; 21. Calibration array; 211. Calibration block; 212. Positioning block;

[0047] 30. Light source; 31. Wire;

[0048] 40. Light guide plate;

[0049] 50. Wire hole. Detailed implementation mode

[0050] In order to have a clearer understanding of the technical features, objectives, and effects of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. The following detailed description of the embodiments of the present utility model in the drawings does not limit the scope of the present utility model to be protected, but only represents the selected embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0051] It should be noted that when an element is referred to as "fixed to" another element, it means that it can be directly on the other element or there may be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right", "up", and "down" used in this specification indicate the orientation or position based on the orientation or position shown in the drawings.

[0052] It should still be noted that the terms "first", "second", and other similar expressions used in this specification are only for the purpose of convenience of description and to distinguish between the same items or similar items with basically the same functions and effects, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of technical features. The meaning of "a plurality" refers to a quantity of two or more, unless otherwise clearly and specifically defined. It is worth noting that although the functional modules are divided in the device or structure schematic diagram, in some cases, it can be different from the module division in the device or structure.

[0053] Unless otherwise defined, the technical terms and scientific terms used in this specification have the same meanings as those commonly understood by those of ordinary skill in the technical field to which the present utility model belongs. The terms used in this specification are only for the purpose of describing specific embodiments, and are not intended to limit the present utility model. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items. It should be understood that as long as there is no conflict, the technical features involved in the following various embodiments of the present utility model can be combined with each other.

[0054] Please refer to Figure 1 and Figure 2a , Figure 1 which shows a schematic assembly structure diagram of a calibration device provided by some embodiments of the present utility model, Figure 2a which shows a schematic disassembly and assembly structure diagram of a calibration device provided by some embodiments of the present utility model.

[0055] As Figure 1 and Figure 2a shown, the calibration device 100 includes a mounting box 10, a transparent calibration plate 20 and a light source 30. The transparent calibration plate 20 and the light source 30 are arranged in the mounting box 10, the light source 30 is arranged at the lower end of the transparent calibration plate 20, the light source 30 is used for emitting light, and moreover, the light emitted by the light source 30 can be transmitted to the transparent calibration plate 20. In the embodiment of the present utility model, the light source 30 is a light-emitting PCB board, and a plurality of LED lamp beads are arranged on the light-emitting PCB board. When the power is turned on, the LED lamp beads emit light. It can be understood that the light source 30 can also be any other suitable device or component, and the embodiment of the present utility model does not make any limitation thereto.

[0056] Please refer to Figure 2b , the transparent calibration plate 20 includes a calibration array 21 composed of a plurality of opaque calibration blocks 211 and positioning blocks 212. The positioning block 212 is arranged at the central position of the calibration array 21, that is, the positioning block 212 is arranged at the central position of the calibration array 21. The shape of the positioning block 212 is different from that of the surrounding calibration blocks 211. For example, in some embodiments, the shape of the calibration block 211 is circular, and the shape of the positioning block 212 is annular.

[0057] In the embodiments of the present utility model, multiple opaque calibration blocks 211 are all impermeable to the light emitted by the light source 30, the positioning block 212 can partially transmit the light emitted by the light source 30, and other areas of the transparent calibration plate 20 except for the calibration blocks 211 and the positioning block 212 can transmit the light emitted by the light source 30. Thus, after obtaining calibration photos by using the main camera and each side camera, the calibration blocks 211 and the positioning block 212 are formed in the calibration photos, that is, the calibration photos include the calibration blocks 211 and the positioning block 212. Furthermore, according to the position of the positioning block 212 in the calibration photos, the relative positions of the main camera and other side cameras can be accurately determined, and the specific surface of the item to be measured can be recognized, improving the accuracy of detection and the user experience.

[0058] In some embodiments, the calibration blocks 211 can be regular shapes such as circular, square or rectangular, or the calibration blocks 211 can also be irregular shapes such as oval, rhombus or trapezoid. The positioning block 212 can be a regular or irregular ring shape. Among them, the irregular ring shape can be, for example, Figure 2c a in Figure 2c b in Figure 2c c in Figure 2c d in Figure 2d e in Figure 2d f in Figure 2d g in Figure 2d or h in Figure 2c and Figure 2d In the irregular ring shapes shown in, the dark areas are impermeable to the light emitted by the light source 30, and the white areas can transmit the light emitted by the light source 30. The regular ring shape can be the standard ring shown in Figure 3 . The inner diameter of the standard ring is d1, and the outer diameter of the standard ring is d2. Among them, Figure 3 In the standard ring shown in, the dark areas are impermeable to the light emitted by the light source 30, and the white areas can transmit the light emitted by the light source 30.

[0059] In the embodiments of the present utility model, please refer to Figure 2b and Figure 3 . The shape of the calibration blocks 211 in the calibration array 21 is set to be circular, the shape of the positioning block 212 is set to be a ring shape and is a standard ring. The outer diameter (i.e., d2) of the positioning block 212 is the same as the diameter of the calibration block 211, and the inner diameter (i.e., d1) of the positioning block 212 is smaller than the diameter of the calibration block 211. By setting the positioning block 212 as the standard ring shown in Figure 3 , the outer diameter of the positioning block 212 is the same as the diameter of the calibration block 211, and the inner diameter of the positioning block 212 is smaller than the diameter of the calibration block 211. In this way, the position of the positioning block 212 can be quickly determined in the obtained calibration photos, and then operations such as camera field of view fusion at different angles can be performed based on the position of the positioning block 212.

[0060] In some embodiments, the number of rows of the calibration array 21 is set to M, and the number of columns is set to N. When both the number of rows M and the number of columns N are odd, the center of the calibration array 21 is set at the (M + 1) / 2-th row and the (N + 1) / 2-th column of the calibration array 21. For example, referring to Figure 4a , Figure 4a where the number of rows M and the number of columns N of the calibration array 21 are both 5 in Figure 4a , the center of the calibration array 21 is set at the (5 + 1) / 2 = 3-th row and the (5 + 1) / 2 = 3-th column of the calibration array 21 (i.e., Figure 4a M1 shown in Figure 4a ), and a positioning block is set at the center M1.

[0061] When both the number of rows M and the number of columns N are even, the center of the calibration array 21 is set at the M / 2-th row and the N / 2-th column of the calibration array 21. For example, referring to Figure 4b , Figure 4b where the number of rows M and the number of columns N of the calibration array 21 are both 6 in Figure 4b , the center of the calibration array 21 is set at the 6 / 2 = 3-th row and the 6 / 2 = 3-th column of the calibration array 21 (i.e., Figure 4b M2 shown in Figure 4b ), and a positioning block is set at the center M2.

[0062] When the number of rows M is odd and the number of columns N is even, the center of the calibration array 21 is set at the (M + 1) / 2-th row and the N / 2-th column of the calibration array 21. For example, referring to Figure 4c , Figure 4c where the number of rows M of the calibration array 21 is 5 and the number of columns N is 6 in Figure 4c , the center of the calibration array 21 is set at the (5 + 1) / 2 = 3-th row and the 6 / 2 = 3-th column of the calibration array 21 (i.e., Figure 4c M3 shown in Figure 4c ), and a positioning block is set at the center M3.

[0063] When the number of rows M is even and the number of columns N is odd, the center of the calibration array 21 is set at the M / 2-th row and the (N + 1) / 2-th column of the calibration array 21. For example, referring to Figure 4d , Figure 4d where the number of rows M of the calibration array 21 is 6 and the number of columns N is 5 in Figure 4d , the center of the calibration array 21 is set at the 6 / 2 = 3-th row and the (5 + 1) / 2 = 3-th column of the calibration array 21 (i.e., Figure 4d M4 shown in Figure 4d ), and a positioning block is set at the center M4.

[0064] By setting the center of the calibration array 21, the positioning block 212 is set at the center of the calibration array 21. In this way, the position of the positioning block 212 can be quickly determined in the captured calibration photo, which is convenient for calculating the distances and positions between each side camera and the main camera, and further quickly determining the relative positions of the main camera and other side cameras.

[0065] Referring to Figure 5, in some embodiments, a light guide plate 40 (or called a light homogenizing plate) is further disposed in the mounting box 10. The light guide plate 40 is disposed between the light source 30 and the transparent calibration plate 20. The light guide plate 40 is used to diverge and homogenize the light emitted by the light source 30, so that the light can be uniformly transmitted to the transparent calibration plate 20. Thus, when using a camera to take a calibration photo, the brightness of the taken calibration plate picture is more uniform.

[0066] Please refer to again Figure 1 and Figure 2a (or Figure 1 and Figure 5 ), in some embodiments, the mounting box 10 includes a box body 11 and a box cover 12. Among them, the box cover 12 is disposed at one end of the opening of the box body 11, and the transparent calibration plate 20 and the light source 30 are disposed in the box body 11. In the embodiment where the light guide plate 40 is disposed in the mounting box 10, the transparent calibration plate 20, the light source 30 and the light guide plate 40 are all disposed in the box body 11.

[0067] It can be understood that the sizes and shapes of the transparent calibration plate 20, the light source 30 and the light guide plate 40 should be the same or adapted to each other. The sizes and shapes of the transparent calibration plate 20, the light source 30 and the light guide plate 40 should be the same as or adapted to the size and shape of the box body 11, so that the transparent calibration plate 20, the light source 30 and the light guide plate 40 can be disposed in the box body 11. By disposing the transparent calibration plate 20, the light source 30 and / or the light guide plate 40 in the box body 11, the box body 11 can protect the transparent calibration plate 20, the light source 30 and / or the light guide plate 40, and at the same time ensure that the light emitted by the light source 30 can be fully and uniformly transmitted to the transparent calibration plate 20.

[0068] Please refer to Figure 2a or Figure 5 , in some embodiments, the box cover 12 includes a connecting portion 121 and a switch portion 122. Among them, one end of the connecting portion 121 is fixed to the peripheral side of the upper surface of the opening of the box body 11, and the size and shape of the connecting portion 121 match the size and shape of the box body 11.

[0069] The switch part 122 is provided with two long strip guide rails 1221 that are parallel to each other and a sliding cover 1222. That is, the switch part 122 includes two long strip guide rails 1221 and a sliding cover 1222. The two long strip guide rails 1221 are parallel to each other. The long strip guide rails 1221 are fixed to one end of the connecting part 121 away from the box body 11 and are arranged oppositely. That is, the two long strip guide rails 1221 are respectively fixed to the upper end of the connecting part 121 and are arranged oppositely. The sliding cover 1222 is slidably arranged between the two long strip guide rails 1221. Through the cooperation between the sliding cover 1222 and the long strip guide rails 1221, the installation box can be opened or closed, which plays a certain protective role for the transparent calibration plate 20, the light source 30 and / or the light guide plate 40 arranged in the box body 11 of the installation box 10, and can reduce the entry of dust, solid particles, etc. into the installation box 10, improve the cleanliness of the assembly, and extend the service life.

[0070] Please refer to Figure 6 , Figure 7 and Figure 8 , in some embodiments, chutes 12211 are respectively formed on the opposite sides of the long strip guide rails 1221, and the two sides of the sliding cover 1222 are respectively set to shapes adapted to the chutes 12211, such as Figure 6 , Figure 7 or Figure 8 the protruding strips 12221 shown. By setting the two sides of the sliding cover 1222 to shapes adapted to the chutes 12211, it is convenient to slide the sliding cover 1222 open or closed, improving the convenience of use.

[0071] In some embodiments, bead screws 12212 are respectively arranged at both ends of the long strip guide rail 1221 in the moving direction of the sliding cover 1222. Concave pits 12222 are respectively formed on both sides of the sliding cover 1222 corresponding to the bead screws 12212. That is, concave pits 12222 are formed at positions on both sides of the sliding cover 1222 corresponding to the bead screws 12212, and the bead screws 12212 cooperate with the concave pits 12222. When opening the sliding cover 1222, slide the sliding cover 1222 between the two long strip guide rails 1221 to completely expose the transparent calibration plate 20. The spring inside the bead screw 12212 pushes up the bead screw 12212 so that one end of the sliding cover 1222 is still clamped at the long strip guide rail 1221, or the sliding cover 1222 can be completely separated from the long strip guide rail 1221, which can be selected according to the actual working conditions. When it is necessary to close the sliding cover 1222, slide the sliding cover 1222 between the two long strip guide rails 1221 to a position where it completely covers the transparent calibration plate 20. The springs inside the bead screws 12212 at both ends push up the bead screws 12212 so that the sliding cover 1222 is fixed to the long strip guide rail 1221. By setting the cooperation between the bead screws 12212 and the concave pits 12222, it is used to fix the sliding cover 1222 after opening or closing the sliding cover 1222, reduce the shaking of the sliding cover 1222, and ensure the stability and sealing of the installation box 10.

[0072] Please refer to again Figure 6 or Figure 7 , in some embodiments, a pulling groove 12223 is provided on the sliding cover 1222. When opening or closing the sliding cover 1222, the user can quickly pull the sliding cover 1222 through the pulling groove 12223, and can quickly open or close the sliding cover 1222.

[0073] Please refer to together Figure 1 , Figure 2a and Figure 9 , in some embodiments, a wire hole 50 is formed at the side end of the installation box 10, that is, a wire hole 50 is formed at the side end of the box body 11 of the installation box 10. The wire 31 of the light source 30 passes through the wire hole 50, which is convenient for an external power supply to be electrically connected to the light source 30 through the wire 31. The external power supply provides electrical energy for the light source 30 through the wire 31, so that the light source 30 emits light.

[0074] In summary, the calibration device provided by the embodiment of the present invention includes: an installation box, a transparent calibration plate and a light source are arranged in the installation box, the light source is arranged at the lower end of the transparent calibration plate, the transparent calibration plate includes a calibration array composed of a plurality of opaque calibration blocks, and a positioning block is arranged at the center of the calibration array, and the shape of the positioning block is different from that of the surrounding calibration blocks.

[0075] In the embodiment of the present utility model, a positioning block is arranged at the center of the calibration array of the transparent calibration plate, so that when using the calibration device to detect the item to be measured, the relative positions of the main camera and other side cameras can be accurately determined according to the position of the positioning block in the calibration photo obtained by shooting, and the specific surface of the item to be measured can be identified, improving the accuracy of detection and the user experience.

[0076] Those skilled in the art can understand that the above technical features can be used in any combination without limitation. The above embodiments are only for explaining the technical concept and characteristics of the present utility model, and the purpose is to enable those who are familiar with this technology to understand the technical features, purposes and effects of the present utility model more clearly and implement accordingly. It is not intended to limit the scope of the claimed rights of the present utility model. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present utility model, or directly or indirectly applied in other related technical fields, should be included in the scope covered by the claims of the present utility model by the same token.

Claims

1. A calibration device, characterized in that, include: An installation box, wherein a transparent calibration plate and a light source are arranged in the installation box, and the light source is arranged at the lower end of the transparent calibration plate; The transparent calibration plate comprises a calibration array composed of a plurality of opaque calibration blocks. A positioning block is arranged at the center of the calibration array. The shape of the positioning block is different from that of the surrounding calibration blocks.

2. The calibration device according to claim 1, characterized in that, The number of rows of the calibration array is set to M, and the number of columns is set to N. When the number of rows M and the number of columns N are both odd numbers, the center of the calibration array is set at the (M+1) / 2th row and the (N+1) / 2th column of the calibration array; When the number of rows M and the number of columns N are both even numbers, the center of the calibration array is set at the M / 2th row and the N / 2th column of the calibration array; When the number of rows M is an odd number and the number of columns N is an even number, the center of the calibration array is set at the (M+1) / 2th row and the N / 2th column of the calibration array; When the number of rows M is an even number and the number of columns N is an odd number, the center of the calibration array is set at the M / 2th row and the (N+1) / 2th column of the calibration array.

3. The calibration device according to claim 1, wherein A light guide plate is also provided in the installation box, and the light guide plate is provided between the light source and the transparent calibration plate.

4. The calibration device according to claim 1, wherein The shape of the calibration block in the calibration array is set to be circular, the shape of the positioning block is set to be annular, the outer diameter of the positioning block is the same as the diameter of the calibration block, and the inner diameter of the positioning block is smaller than the diameter of the calibration block.

5. The calibration device according to claim 1, characterized in that, The installation box comprises a box body and a box cover; The box cover is arranged at one end of the box body opening, and the transparent calibration plate and the light source are arranged in the box body.

6. The calibration device according to claim 5, wherein, The box cover comprises a connecting portion and a switch portion; One end of the connecting portion is fixed to the peripheral side of the upper surface of the box body opening; The switch part is configured as two parallel long rails and a sliding cover. The long rails are fixed to one end of the connection part away from the box body and are arranged opposite to each other. The sliding cover is slidably arranged between the long rails.

7. The calibration device according to claim 6, characterized in that, The opposite sides of the long guide rail are respectively provided with sliding grooves, and the two sides of the sliding cover are designed to be in shapes matching the sliding grooves.

8. The calibration device according to claim 6, wherein The two ends of the long guide rail in the moving direction of the sliding cover are respectively provided with ball screws, and pits are respectively provided on both sides of the sliding cover corresponding to the ball screws.

9. The calibration device according to claim 6, wherein The sliding cover is provided with a pulling groove.

10. The calibration device according to claim 1, characterized in that, A wire hole is provided at the side end of the installation box, and the wire of the light source is passed through the wire hole.

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