Machine vision deformation monitoring precision comparison target

Abstract

The utility model provides a machine vision deformation monitoring precision comparison target. The machine vision deformation monitoring precision comparison target comprises a bottom plate, a connecting piece and a prism assembly. The bottom plate comprises a fixing part and a target part, the fixing part is used for fixing the bottom plate on a measured object, the target part is provided with a target, and the target is used as a target for machine vision monitoring so as to monitor the deformation quantity of the measured object. One end of the connecting piece is movably arranged in the center of the target so that the connecting piece can rotate around the first axial direction on the bottom plate with the center of the target as the circle center, and the other end of the connecting piece extends out of the bottom plate along the plane where the target is located. The prism assembly is connected to the end, extending out of the bottom plate, of the connecting piece, and the prism assembly serves as a target monitored by the total station and is used for monitoring the deformation quantity of a measured object. According to the machine vision deformation monitoring precision comparison target provided by the invention, the consistency of a manual monitoring result and a machine vision monitoring result can be ensured, and the accuracy of the machine vision monitoring result can be verified by using the manual monitoring result.

Description

Technical Field

[0001] The present application relates to the technical field of civil engineering construction monitoring, and in particular to a machine vision deformation monitoring accuracy comparison target. Background Art

[0002] Machine vision deformation monitoring technology is an emerging deformation monitoring technology developed and applied in recent years. It uses machine vision to quickly measure and judge the deformed body, and comprehensively applies electronics, photoelectric detection, image processing and computer technology. It has the characteristics of high efficiency, accuracy, low cost and strong adaptability. In some scenarios, it can realize automated monitoring to replace some manual work.

[0003] Targets are indispensable in high-precision visual monitoring. During operation, the visual monitoring equipment establishes a plane coordinate system to obtain the coordinates of each target on the camera's field of view during the monitoring period. The changes in the coordinate values ​​reflect the deformation of each monitoring point, thereby calculating the relative changes between the monitoring points.

[0004] Currently, there are no unified national standards for machine vision monitoring, and its measurement results cannot be guaranteed to be absolutely correct. Therefore, when using automated monitoring, it is advisable to use automated monitoring as the primary method, supplemented by manual monitoring. Manual monitoring should verify the automated monitoring results to verify the correctness of the visual monitoring results. However, in existing technologies, the deformation data obtained by manual monitoring is inconsistent with the deformation data obtained by machine vision monitoring, making it impossible to verify the machine vision monitoring results with manual monitoring results, and thus unable to determine the accuracy of the machine vision monitoring results. Utility Model Content

[0005] The present application provides a machine vision deformation monitoring accuracy comparison target, which can ensure the consistency of manual monitoring results and machine vision monitoring results, and further enable the use of manual monitoring results to verify the accuracy of machine vision monitoring results.

[0006] In one embodiment of the present application, a machine vision deformation monitoring accuracy comparison target is provided, including: a base plate, including a fixing part and a target part, the fixing part is used to fix the base plate to the object to be measured, and the target part is provided with a target, and the target is used as a target for machine vision monitoring to monitor the deformation of the object to be measured; a connecting piece, one end of the connecting piece is movably arranged at the center of the target, so that the connecting piece can rotate around a first axis on the base plate with the center of the target as the center of the circle, and the other end extends out of the base plate along the plane where the target is located; and a prism assembly, connected to one end of the connecting piece extending out of the base plate, the prism assembly is used as a target for total station monitoring to monitor the deformation of the object to be measured.

[0007] Furthermore, the target portion is provided with a circular or arc-shaped limiting groove, the center of the limiting groove coincides with the center of the target; the connecting piece is provided with a limiting piece, the limiting piece is clamped in the limiting groove, and can slide along the limiting groove to drive the connecting piece to rotate.

[0008] Furthermore, the limiting groove passes through the target portion, and the limiting member includes a screw, which is threadedly connected to the connecting member, and the screw head and the connecting member are respectively located on both sides of the limiting groove, and the outer diameter of the screw head is larger than the width of the limiting groove to limit the connecting member.

[0009] Furthermore, the prism assembly includes an adjustment device and a prism; the adjustment device is connected to the connecting piece, the prism is detachably mounted on the adjustment device, and the adjustment device can rotate and adjust the prism along the second axis and the third axis; the first axis, the second axis and the third axis are perpendicular to each other.

[0010] Furthermore, the adjustment device includes a mounting member and a fixing assembly, the mounting member is connected to the connecting member, the fixing assembly is rotatably mounted on the mounting member along the second axis, and the prism is rotatably mounted on the fixing assembly along the third axis to adjust the prism along the second and third axes.

[0011] Furthermore, the fixing assembly includes at least two fixing parts, the mounting part has at least two adjustment slots, and the fixing parts and the adjustment slots are arranged in a one-to-one correspondence; the fixing parts and the prism are connected to the circumferential side of the prism; the adjustment slot is arc-shaped, and the fixing part can be slidably arranged in the adjustment slot to rotate the adjustment prism along the second axis.

[0012] Furthermore, the fixing portion is arranged perpendicular to the target portion.

[0013] Furthermore, the target portion includes a semicircular segment and a straight line segment, the semicircular segment and the straight line segment are connected, and two sides of the straight line segment are tangent to the semicircular segment; one end of the straight line segment away from the semicircular segment is connected to the fixed portion; and the center of the target coincides with the center of the semicircular segment, so that the end of the connecting piece extending from the base plate can move around the outer circumference of the semicircular segment.

[0014] Furthermore, the diameter of the semicircular segment is 14-16 cm, and the length of the straight line segment from the tangent point with the semicircular segment to the fixing portion is 10-15 cm.

[0015] Furthermore, it also includes a bearing fixing screw and a bearing, the bearing is rotatably installed in the center of the target through the bearing fixing screw, and the connecting piece is sleeved on the outside of the bearing so that the bearing can drive the connecting piece to rotate.

[0016] The present application provides a machine vision deformation monitoring accuracy comparison target, comprising a base plate, a connector, and a prism assembly. A fixing portion and a target portion are provided on the base plate, the base plate is fixed to the object being measured via the fixing portion, and the target portion is provided with a target. The deformation or displacement of the target is monitored by machine vision to thereby determine the deformation or displacement of the object being measured, which is deformation data obtained through automated monitoring. One end of the connector is movably disposed at the center of the target, and the connector can rotate about a first axis on the base plate with the center of the target as the center of a circle, while the other end extends out of the base plate along the plane where the target is located. A prism assembly is connected to one end of the connector extending from the base plate. A total station monitors the deformation or displacement of the prism assembly to thereby determine the deformation or displacement of the object being measured, which is deformation data obtained through manual monitoring. In this way, the center of the prism assembly and the center of the target can always be on the same vertical line, ensuring that the deformation or displacement obtained through manual monitoring is consistent with the deformation or displacement obtained through machine vision monitoring. The manual monitoring data can then be used to verify the machine vision monitoring data, further improving the accuracy of the machine vision monitoring data. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the front structure of the machine vision deformation monitoring accuracy comparison target of this application;

[0018] Figure 2 This is a schematic diagram of the structure of the mounting member of this application;

[0019] Figure 3 Schematic diagram of the three-dimensional structure of the machine vision deformation monitoring accuracy comparison target of this application;

[0020] Figure 4 This is an enlarged view of the local structure of the limiting member of the present application being clamped in the limiting groove;

[0021] Figure 5 This is a schematic diagram of the local structure in which the connector of the present application is movably arranged at the center of the target.

[0022] Figure 1: Machine vision deformation monitoring accuracy comparison target-100, base plate-110, fixing part-111, expansion bolt hole-1111, target part-112, semicircular segment-1121, straight segment-1122, target-113, limiting groove-114, connecting part-120, limiting part-121, screw head-1211, prism assembly-130, adjusting device-131, mounting part-1311, adjusting groove-1312, fixing assembly-1313, fixing part-1314, hole-1315, prism-132, bearing fixing screw-140, bearing-150, first axial direction-Y, second axial direction-Z, third axial direction-X DETAILED DESCRIPTION

[0023] The application will be described in further detail below with specific reference being made to the drawings. Like elements in different embodiments are denoted by like reference numerals. In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the application. However, it will be apparent to one skilled in the art that the specific features described can not be felt to be necessary in every case and that within the scope of the present application, some features can be omitted, or other elements, materials, methods, etc. can be substituted. In some cases, some of the procedures outlined in the present application are conducted by means not specifically described in the present application, in order not to obscure the core of the present application with too many details, and it is not necessary for one skilled in the art to fully understand the related procedures according to the description in the present application and the general knowledge in the art.

[0024] In addition, the features, operations or characteristics described in the specification can be combined in any appropriate manner to form various embodiments, and the steps of the operations involved in each embodiment can be sequentially adjusted or adjusted in a manner that can be easily seen by one skilled in the art. Therefore, the specification and drawings are only intended to clearly describe one embodiment, and do not mean that the composition and / or order is necessary.

[0025] The serial numbers of the components in this paper, such as "first", "second", etc., are only used to distinguish the described objects, and have no technical meaning. The "connection" and "coupling" in the present application include direct and indirect connection (coupling) unless otherwise specified.

[0026] In the prior art, simply paste the total station reflector on the visual monitoring target, or separately arrange reflectors or small prisms near the target 113, which will make the total station measurement center and the visual monitoring measurement center not overlap. Since the deformation of the measured structure is not only generated in the main deformation direction that needs to be measured, it will cause the target 113 to change in a certain angle, and the total station measurement center and the machine vision monitoring measurement center will not coincide, which will make the manual deformation value and the machine vision monitoring deformation value inconsistent, and further make the manual monitoring result unable to verify the accuracy of the machine vision monitoring result. For example, in the deformation monitoring of a tunnel, the convergence of the tunnel is monitored by measuring the change of the distance between two measuring points, and the convergence value is required to reflect the change of the length of the two measuring points in the connecting direction. The tunnel deformation direction will not be consistent with the convergence direction, which will cause the convergence values measured on the two sides of the center not to be consistent, and further unable to determine the accuracy of the automatic monitoring convergence value.

[0027] The present application provides a machine vision deformation monitoring precision comparison target 100, please refer to Figure 1-5The machine vision deformation monitoring precision comparison target 100 comprises a base plate 110, a connecting piece 120 and a prism assembly 130.

[0028] Please refer to Figure 1 and Figure 3 The base plate 110 comprises a fixing part 111 and a target part 112, the fixing part 111 is used for fixing the base plate 110 to the measured object, and the target part 112 is provided with a target 113, which is used as a target for machine vision monitoring to monitor the deformation of the measured object. One end of the connecting piece 120 is movably arranged at the center of the target 113, so that the connecting piece 120 can rotate on the base plate 110 around the first axis Y with the center of the target 113 as the center, and the other end extends out of the base plate 110 along the plane where the target 113 is located. The prism assembly 130 is connected to the end of the connecting piece 120 extending out of the base plate 110, and the prism assembly 130 is used as a target for total station monitoring to monitor the deformation of the measured object.

[0029] In this application, by arranging the target 113 on the target part 112, the machine vision monitors the deformation of the target 113, and then determines the deformation or displacement of the measured object, which is the deformation or displacement obtained by automatic equipment monitoring. One end of the connecting piece 120 is movably arranged at the center of the target 113, the other end extends out of the base plate 110, and the connecting piece 120 rotates on the base plate 110 around the first axis Y with the center of the target 113 as the center, and the prism assembly 130 is connected to the end of the connecting piece 120 extending out of the base plate 110. The total station monitors the deformation or displacement of the target 113, and then determines the deformation or displacement of the measured object, which is the artificial monitoring. In this way, when the measured object deforms, the center of the prism assembly 130 can always be on the same vertical line as the center of the target 113, so that the deformation or displacement obtained by artificial monitoring is consistent with the deformation or displacement obtained by automatic monitoring, and then the artificial monitoring result can be used to verify the automatic monitoring result, thereby improving the accuracy of the automatic monitoring result.

[0030] It should be noted that in addition to using the total station to detect the deformation of the prism 132 in the main deformation direction, other monitoring means can also be used for monitoring, which is not specifically limited here.

[0031] Please refer to Figure 1 The target part 112 is provided with a circular or arc-shaped limiting groove 114, the center of the limiting groove 114 coincides with the center of the target 113, the connecting piece 120 is provided with a limiting piece 121, the limiting piece 121 is clamped in the limiting groove 114 and can slide along the limiting groove 114 to drive the connecting piece 120 to rotate.

[0032] Through the cooperation between the limiting groove 114 and the limiting member 121, the movement of the connecting member 120 can be further limited to the plane where the target 113 is located, preventing the connecting member 120 from moving outside the plane where the target 113 is located, such as movement perpendicular to the plane where the target 113 is located, thereby improving the accuracy of the manual monitoring results.

[0033] Please refer to Figure 1 and Figure 4 The limiting groove 114 passes through the target portion 112, and the limiting member 121 includes a screw, which is threadedly connected to the connecting member 120, and the screw head 1211 of the screw and the connecting member 120 are respectively located on both sides of the limiting groove 114, and the outer diameter of the screw head 1211 is greater than the width of the limiting groove 114 to limit the connecting member 120.

[0034] The screw head 1211 and the connector 120 are respectively located on both sides of the limiting groove 114, which can realize the free rotation of the connector 120 around the first axis Y and limit the movement of the connector 120 to the plane where the target 113 is located.

[0035] In other embodiments, the limiting groove 114 and the limiting member 121 may also be matched in other ways, such as the limiting groove 114 being a recessed structure in the target portion 112 rather than penetrating the target portion 112, and the limiting member 121 being retained within the limiting groove 114 and being slidable along the limiting groove 114. More specifically, for example, the limiting member 121 may be a slider, and a slide rail may be provided in the limiting groove 114. This is not specifically limited here.

[0036] Please refer to Figure 3 The prism assembly 130 includes an adjusting device 131 and a prism 132. The adjusting device 131 is connected to the connecting member 120. The prism 132 is detachably mounted on the adjusting device 131. The adjusting device 131 can rotate and adjust the prism 132 along the second axial direction Z and the third axial direction X. The first axial direction Y, the second axial direction Z, and the third axial direction X are perpendicular to each other.

[0037] When the object being measured is deformed or displaced, the connecting member 120 will drive the prism assembly 130 to move. In order to facilitate manual measurement of the deformation or displacement of the prism 132 without moving the position of the total station, the prism 132 is adjusted by rotating the adjustment device 131 along the first axis Y and the second axis Z, so that the total station can always accurately detect the displacement deformation of the prism 132, ensuring the smooth progress of the monitoring process.

[0038] Please refer to Figure 3The adjusting device 131 includes a mounting member 1311 and a fixing assembly 1313. The mounting member 1311 is connected to the connecting member 120. The fixing assembly 1313 is rotatably mounted on the mounting member 1311 along the second axial direction Z. The prism 132 is rotatably mounted on the fixing assembly 1313 along the third axial direction X to rotate and adjust the prism 132 along the second axial direction Z and the third axial direction X.

[0039] The structure of the adjustment device 131 in the present application is simple. On the one hand, the mounting member 1311 is connected to the connecting member 120, and on the other hand, the fixing assembly 1313 can be rotatably mounted on the mounting member 1311 along the second axis Z. With this simple structure, the prism 132 can be rotatably adjusted along the second axis Z and the third axis X.

[0040] Please refer to Figure 2-3 The fixing assembly 1313 includes two fixing members 1314. The mounting member 1311 has two adjustment slots 1312, and the fixing members 1314 are arranged in a one-to-one correspondence with the adjustment slots 1312. The fixing members 1314 and the prism 132 are connected to opposite sides of the prism 132. The adjustment slots 1312 are arc-shaped, and the fixing members 1314 are slidably disposed within the adjustment slots 1312 to rotate and adjust the prism 132 along the second axis Z.

[0041] Due to the arrangement of the arc-shaped adjustment slot 1312 , the fixing member 1314 slides in the adjustment slot 1312 , thereby achieving rotational adjustment of the fixing member 1314 along the second axis Z, thereby rotating and adjusting the prism 132 along the second axis Z. The device has a simple structure and is easy to adjust.

[0042] In this embodiment, if Figure 2-3 The mounting member 1311 is a rectangular stainless steel plate with a hole 1315 in the center. The hole 1315 is used to be fixedly connected to the connector 120. The connector 120 is threadedly connected to the hole 1315. For example, the end of the connector 120 extending from the target portion 112 may have a thread, and the hole 1315 may also have a thread, and the two are screwed together. Two arc grooves are provided on the mounting member 1311 with the hole 1315 as the center. The arc groove is the aforementioned adjustment groove 1312. A screw hole is provided at the top of the fixing member 1314. The fixing screw passes through the adjustment groove 1312 on the mounting member 1311 to install the fixing member 1314 in the adjustment groove 1312. Screw holes are provided on opposite sides of the prism 132 for mounting the prism 132 on the fixing member 1314 by screws.

[0043] Please refer to Figure 3 , the fixing portion 111 is arranged perpendicular to the target portion 112 .

[0044] Please refer to Figure 3The target part 112 comprises a semicircular segment 1121 and a straight segment 1122, the semicircular segment 1121 and the straight segment 1122 are connected, and two edges of the straight segment 1122 are tangent to the semicircular segment 1121. One end of the straight segment 1122 away from the semicircular segment 1121 is connected to the fixed part 111, and the center of the target 113 coincides with the center of the semicircular segment 1121, so that the end of the connecting piece 120 extending out of the bottom plate 110 can rotate around the outer periphery of the semicircular segment 1121.

[0045] In the present application, by setting the target part 112 as a semicircular segment 1121 and a straight segment 1122, and the center of the target 113 coincides with the center of the semicircular segment 1121, the structure design is ingenious, which facilitates the movement of the connecting piece 120 along the outer periphery of the semicircular segment 1121, and also saves space and materials.

[0046] Please refer to Figure 1 and Figure 3 The diameter of the semicircular segment 1121 is 14-16 cm, and the length of the straight segment 1122 from the tangent point with the semicircular segment 1121 to the fixed part 111 is 10-15 cm. The side length of the fixed part 111 is 6-10 cm, and the fixed part 111 is provided with two expansion bolt holes 1111 for driving expansion screws to fix the bottom plate 110 on the measured object. Among them, the diameter of the expansion bolt hole 1111 is 10-14 mm, the thickness of the bottom plate 110 is 5-5.5 mm, and the width of the limiting groove 114 is 0.8-1.5 cm.

[0047] More specifically, in the present embodiment, the diameter of the semicircular segment 1121 is 14 cm, the length of the straight segment 1122 from the tangent point with the semicircular segment 1121 to the fixed part 111 is 12 cm, the side length of the fixed part 111 is 8 cm, the diameter of the expansion bolt hole 1111 is 10 mm, the thickness of the bottom plate 110 is 5 mm, and the width of the limiting groove 114 is 1 cm.

[0048] The length of the connecting piece 120 extending out of the bottom plate 110 is 8-10 mm, preferably, the length of the connecting piece 120 extending out of the bottom plate 110 is 9 mm.

[0049] Please refer to Figure 5 The machine vision deformation monitoring precision comparison target 100 further comprises a bearing fixing screw 140 and a bearing 150, the bearing 150 is rotatably installed at the center of the target 113 through the bearing fixing screw 140, and the connecting piece 120 is sleeved on the outside of the bearing 150, so that the bearing 150 can drive the connecting piece 120 to rotate.

[0050] In this embodiment, the bearing 150 has an inner diameter of 8 mm, an outer diameter of 22 mm, and a width of 7 mm. The connector 120 is a long, cubic metal rod with a circular bearing sleeve welded to one end. This allows the connector 120 to be sleeved onto the outer periphery of the bearing 150, allowing it to rotate freely under the drive of the bearing 150. The other end of the connector 120, away from the bearing 150, has a bolt hole for suspending the prism 132 assembly 130. More specifically, the inner diameter of the bearing sleeve is 22 mm, ensuring a secure fit on the bearing 150. The thickness of the bearing sleeve is 5-7 mm, preferably 5 mm, ensuring a strong and unbreakable bearing sleeve. The length of the connector 120 is 11.1-12.1 mm, preferably 11.1 mm. The diameter of the screw head 1211 of the screw in the stopper 121 is 2-2.5 cm, preferably 2 cm.

[0051] It should be noted that the target 113 and the screw head 1211 on the limiting member 121 are disposed on the same side of the target portion 112 , and the connecting member 120 is disposed on a side of the target portion 112 away from the target 113 .

[0052] The measurement accuracy of the prism 132 is better than that of the reflector, so the prism 132 is selected as the measurement mark of the total station in this embodiment.

[0053] The operating principle of the machine vision deformation monitoring accuracy comparison target 100 of the present application is as follows: the device is installed at the location to be monitored using expansion screws. The side of the base plate 110 provided with the targets 113 faces the machine vision monitoring device, ensuring that all targets 113 are within the visual monitoring image to measure the displacement or deformation of the targets 113. According to monitoring needs, the upper screws of the fixing member 1314 can be adjusted, and the position of the fixing member 1314 on the mounting member 1311 along the second axis Z can be adjusted to adjust the prism 132 in the second axis Z. Adjusting the screws on both sides of the prism 132 allows the prism 132 to be rotated and adjusted in the third axis X. The prism 132 is adjusted in the second axis Z and the third axis X, so that the prism 132 is oriented toward the total station. The total station periodically measures the coordinates of the prism 132 to obtain the prism's deformation or displacement. The total station monitoring data is then compared with the data monitored by the machine vision device. If the deformation data measured by the total station is consistent with the data obtained by the machine vision monitoring, the machine vision monitoring result is accurate; otherwise, it is inaccurate. During the monitoring process, if the object being measured has a normal displacement perpendicular to the mounting surface, causing the target 113 to rotate to a certain extent, the bearing 150 does not drive the prism 132 to rotate, so that the prism 132 always remains vertically downward. Based on this, it can be ensured that the displacement generated by the prism 132 is always consistent with the displacement generated by the center of the target 113.

[0054] The machine vision deformation monitoring accuracy comparison target 100 provided in this application is such that if the structure at the installation position of the machine vision deformation monitoring accuracy comparison target 100 is tilted and deformed, the prism 132 is always vertically downward under the action of gravity, and the center of the prism 132 and the center of the target 113 are on the same vertical line. The deformation amount in the main deformation direction is consistent, and actual use makes the deformation amounts of manual monitoring and automatic monitoring methods directly comparable.

[0055] In addition, the prism 132 of the present application can realize the adjustment of the second axis Z and the third axis X angle, which can meet the observation requirements of the total station in any direction in a complex construction environment.

[0056] The machine vision deformation monitoring accuracy comparison target 100 of the present application has a simple structure, reasonable design, low production cost, high reliability in actual use, and meets the monitoring needs of buildings in various periods.

[0057] The above examples are used to illustrate the present invention, which are only used to help understand the present invention and are not intended to limit the present invention. Those skilled in the art of the present invention can make some simple deductions, modifications or substitutions based on the concept of the present invention.

Claims

1. A machine vision deformation monitoring accuracy comparison target, characterized by: include: A base plate includes a fixing portion and a target portion, wherein the fixing portion is used to fix the base plate to the object to be measured, and the target portion is provided with a target, which is used as a target for machine vision monitoring to monitor the deformation of the object to be measured; a connecting member, one end of which is movably disposed at the center of the target so that the connecting member can rotate around a first axial direction on the base plate with the center of the target as the center of a circle, and the other end of which extends out of the base plate along the plane where the target is located; and a prism assembly connected to one end of the connecting piece extending from the base plate. The prism assembly is used as a target monitored by the total station to monitor the deformation of the object being measured.

2. The machine vision deformation monitoring accuracy comparison target according to claim 1, characterized in that: The target portion is provided with a circular or arc-shaped limiting groove, and the center of the limiting groove coincides with the center of the target; The connecting member is provided with a limiting member, which is clamped in the limiting groove and can slide along the limiting groove to drive the connecting member to rotate.

3. The machine vision deformation monitoring accuracy comparison target according to claim 2, characterized in that: The limiting groove passes through the target part, and the limiting member includes a screw, which is threadedly connected to the connecting member, and the screw head of the screw and the connecting member are respectively located on both sides of the limiting groove, and the outer diameter of the screw head is greater than the width of the limiting groove to limit the connecting member.

4. The machine vision deformation monitoring accuracy comparison target according to claim 1, characterized in that: The prism assembly includes an adjustment device and a prism; the adjustment device is connected to the connecting piece, the prism is detachably mounted on the adjustment device, and the adjustment device can rotate and adjust the prism along a second axis and a third axis; the first axis, the second axis and the third axis are perpendicular to each other.

5. The machine vision deformation monitoring accuracy comparison target according to claim 4, characterized in that: The adjustment device includes a mounting member and a fixing assembly, the mounting member is connected to the connecting member, the fixing assembly is rotatably mounted on the mounting member along a second axis, and the prism is rotatably mounted on the fixing assembly along a third axis to rotationally adjust the prism along the second axis and the third axis.

6. The machine vision deformation monitoring accuracy comparison target according to claim 5, characterized in that: The fixing assembly includes at least two fixing members, the mounting member has at least two adjustment slots, and the fixing members are arranged in a one-to-one correspondence with the adjustment slots; the fixing members and the prism are connected to the circumference of the prism; The adjustment slot is arc-shaped, and the fixing member can be slidably disposed in the adjustment slot to rotate and adjust the prism along the second axis.

7. The machine vision deformation monitoring accuracy comparison target according to claim 1, characterized in that: The fixing portion is arranged perpendicular to the target portion.

8. The machine vision deformation monitoring accuracy comparison target according to claim 7, characterized in that: The target portion includes a semicircular segment and a straight line segment, the semicircular segment and the straight line segment are connected, and two sides of the straight line segment are tangent to the semicircular segment; one end of the straight line segment away from the semicircular segment is connected to the fixed portion; and the center of the target coincides with the center of the semicircular segment, so that the end of the connecting member extending from the base plate can move around the outer circumference of the semicircular segment.

9. The machine vision deformation monitoring accuracy comparison target according to claim 8, characterized in that: The diameter of the semicircular segment is 14-16 cm, and the length of the straight line segment from the tangent point with the semicircular segment to the fixing portion is 10-15 cm.

10. The machine vision deformation monitoring accuracy comparison target according to claim 1, characterized in that: It also includes a bearing fixing screw and a bearing. The bearing is rotatably mounted on the center of the target through the bearing fixing screw. The connecting piece is sleeved on the outside of the bearing so that the bearing can drive the connecting piece to rotate.

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