A method and apparatus for multi-angle, omnidirectional camera mounting and DIC measurement.

Abstract

This invention relates to a device for multi-angle, omnidirectional camera installation and DIC measurement, comprising a frame, an observation platform inside the frame, an omnidirectional guide frame on the inner periphery, and a camera assembly and a progressive assembly ringed on the omnidirectional guide frame; the camera assembly is used for real-time measurement of the observed object, and the progressive assembly enables dynamic multi-angle adjustment of the camera assembly; the omnidirectional guide frame is formed by splicing multiple track arms end to end to form an annular disk, and progressive rings with semi-circular cross sections are evenly distributed on the surface of the track arms; the camera assembly includes a calibration camera and a follow-up camera; the follow-up camera is connected to the progressive assembly; the progressive assembly consists of a progressive hammer, with an umbrella-shaped locking rod on the outer periphery of the hammer and a T-shaped adaptive hammer core inside; air storage bladders are symmetrically wrapped on both sides of the hammer core, which are inflated or deflated through air inlet ports; a clamping spring is sandwiched between the air storage bladder and the inner wall of the hammer, which can reset as the air bladder changes, driving the follow-up camera to slide along the progressive ring to achieve dynamic adjustment, which eliminates the blind spot problem caused by the limited viewing angle in single-field measurement.

Description

Technical Field

[0001] This invention belongs to the field of non-contact measurement technology, and specifically relates to a method and apparatus for multi-angle, omnidirectional camera installation and DIC measurement. Background Technology

[0002] With the rapid development of science and technology, non-contact measurement technology has shown broad application prospects in many fields. Especially in industry, materials science, and medicine, the demand for accurate and comprehensive surface deformation measurement is increasingly urgent. While traditional contact measurement methods remain effective in some scenarios, their limitations are obvious. Contact measurement is not only prone to interfering with or damaging the object being measured, but its application is also limited in complex structures, flexible materials, or dynamic environments. Therefore, non-contact measurement technology has emerged and rapidly become an important tool in the field of deformation measurement.

[0003] Digital image correlation (DIC), as a representative of non-contact measurement technology, has gradually become the preferred technology in fields such as industrial testing, material performance analysis, and medical imaging due to its advantages such as non-contact operation, acquisition of three-dimensional deformation information, simple optical path, good environmental adaptability, and wide measurement range. Compared with contact measurement, DIC can acquire high-precision deformation data in real time without affecting the surface state of the object, and is applicable to a variety of materials and complex environments. This makes DIC particularly important in industries such as automotive and aerospace, which have extremely high requirements for the performance of structural components, providing important basis for stress-strain analysis of key components.

[0004] However, existing DIC (Diverterless Computation) technologies primarily focus on single-field-of-view measurements, meaning they can only analyze local data of the target object and cannot achieve omnidirectional measurement of the entire object. This limitation can lead to incomplete measurement results in certain applications, thus affecting the evaluation of the target object's overall performance. This limitation is particularly pronounced in the measurement of circumferential objects and integral structural components, easily resulting in measurement blind spots and severely impacting the accurate evaluation of the target object's overall performance. Therefore, solving the field-of-view blind spot problem in DIC measurement has become a key objective for industry development. Summary of the Invention

[0005] This invention addresses the shortcomings of existing technologies by providing a method and apparatus for multi-angle, omnidirectional camera installation and DIC measurement. The specific technical solution is as follows:

[0006] This invention provides a device for multi-angle, omnidirectional camera installation and DIC measurement, including a frame, an observation platform inside the frame, an omnidirectional guide frame on the inner periphery of the frame, and a camera assembly and a progressive assembly on the upper ring. The camera assembly performs real-time measurement of an object fixed on the observation platform, and the progressive assembly performs dynamic multi-angle adjustment of the camera assembly.

[0007] The omnidirectional guide frame includes a track arm extending along an inner circular path. The track arm is set in the frame, and multiple track arms are provided. The multiple track arms are spliced ​​end to end to form an annular disk surface for fixing the progressive component. The surface of the track arm is evenly distributed with through progressive rings. The cross-section of the progressive ring is semi-circular. The progressive rings are distributed along the inner edge direction of the track arm, and multiple progressive rings are provided. The progressive rings on adjacent side-by-side annular disk surfaces form a sandwich layer for clamping the progressive component.

[0008] The camera assembly includes a calibration camera and a follow-up camera. The calibration camera is detachably mounted on the top of the inner ring of the omnidirectional guide. The fixed position of the calibration camera in the omnidirectional guide is adjustable.

[0009] The progressive assembly includes a progressive hammer installed between the progressive rings. An umbrella-shaped locking rod is provided on the outer periphery of the progressive hammer and is mounted in the progressive ring. A T-shaped adaptive hammer core is inserted inside the locking rod. The adaptive hammer core is embedded in the progressive hammer and has independent air storage bladders symmetrically wrapped on both sides. An air injection port is provided on the outer side of the bladder for inflation and deflation. A clamping spring is tightly clamped between the end of the air storage bladder and the inner wall of the progressive hammer, which can be reset as the air storage bladders are inflated, deflated, and squeezed. A follow-up camera is connected to the progressive hammer and can slide along the progressive ring with the progressive hammer.

[0010] As a preferred embodiment of the present invention, the outer circumferential surface of the progressive hammer is provided with a through semi-circular groove, and there are eight semi-circular grooves. The eight semi-circular grooves are conveniently located below the locking rod. A progressive shaft is erected in the semi-circular groove, and a traveling wheel is rotatably provided, which can roll along the inner wall of the omnidirectional guide frame.

[0011] As a preferred embodiment of the present invention, the outer circumferential surface of the traveling wheel is provided with semi-circular rolling grooves and traveling ramps at equal intervals, which are adapted to the wire diameter of the clamping spring and can rotate with the reciprocating motion of the clamping spring. The surface of the traveling ramp is fitted with an anti-slip coating, which can roll with the omnidirectional guide frame.

[0012] As a preferred technical solution of the present invention, the upper and lower end faces of the progressive hammer are evenly provided with through grooves, and a locking hole is provided at the center of its outer surface. The progressive hammer is provided with a trapezoidal adjustment ruler extending from the groove, which can be dynamically calibrated in real time as the air storage bladders on both sides are inflated, deflated, and squeezed to compress the clamping springs.

[0013] As a preferred embodiment of the present invention, the follow-up camera includes a locking plate and a fixed slider. Multiple stabilizing clamps are detachably inserted between the locking plate and the fixed slider, forming a support for mounting the progressive ring. A locking bolt is inserted into the inner wall of the locking plate, which engages with a locking hole for detachable connection between the progressive component and the follow-up camera. A limiting shaft passes through the fixed slider, and a movable slider is sleeved along the shaft. A measuring camera is fitted to the end face of the movable slider.

[0014] As a preferred embodiment of the present invention, a rotating platform is provided between the movable slider and the measuring camera, which can independently adjust the rotation angle of the measuring camera pointing towards the observation platform.

[0015] As a preferred embodiment of the present invention, the end of the locking rod is rotatably mounted in the progressive ring and can rotate synchronously with the progressive hammer.

[0016] As a preferred embodiment of the present invention, the surface of the track arm is fitted with elastic damping strips, which are disposed on the upper and lower surfaces of the progressive ring.

[0017] As a preferred embodiment of the present invention, the surface of the track arm is provided with through triangular holes to reduce weight and stress concentration.

[0018] As a preferred technical solution of the present invention, a multi-angle, all-around camera installation and DIC measurement method includes the following steps:

[0019] S1. Preparation: Reset the follow-up camera to the midpoint of the progressive ring, and check that the omnidirectional guide is secure and locked.

[0020] S2. Loading: Fix the object to be measured to the outer circumference of the observation platform, and send the observation platform into the omnidirectional guide frame;

[0021] S3. Calibration Measurement: The calibration camera is activated, and images are added instantly during measurement.

[0022] S4. First follow-up measurement: The follow-up camera is activated, and images are added in real time;

[0023] S5. Second follow-up measurement: The left air inlet stops injecting air, the left air bladder remains empty, the left clamping spring remains stationary, the right air inlet evacuates air, the right air bladder contracts synchronously, the right clamping spring extends simultaneously due to depressurization, the right clamping spring pulls the right-side travel wheel to move, driving the progressive component to move counterclockwise along the progressive ring, and the second follow-up measurement is performed.

[0024] S6. Third follow-up measurement: The left air inlet is filled with air, the left air bladder expands, the left clamping spring is compressed back synchronously, the right air inlet stops filling with air, the right air bladder remains empty, the right clamping spring does not move, the left clamping spring pulls the travel wheel to move, driving the progressive component to move counterclockwise along the progressive ring, and the third follow-up measurement is performed.

[0025] S7. Fourth follow-up measurement: Air is drawn out from the left air inlet, the left air bladder contracts, the left clamping spring extends synchronously due to depressurization, air is injected from the right air inlet, the right air bladder expands, the right clamping spring is compressed back, the left clamping spring pulls the travel wheel to move, driving the progressive component to move clockwise along the progressive ring to return to its original position, and the fourth follow-up measurement is performed.

[0026] S8. Measurement Results: After step S7 is completed, all gas injection ports stop injecting and evacuating gas, and the measurement results of all cameras are uploaded at the same time. The server receives the data and calculates the solution.

[0027] S9. Unloading: Remove the object to be measured from the outer periphery of the observation platform and pull the observation platform away from the omnidirectional guide frame.

[0028] The beneficial effects of this invention are:

[0029] This invention overcomes the shortcomings of traditional technologies by employing a multi-segment measurement approach, demonstrating significant advantages. Firstly, the device, through the design of a frame and an omnidirectional guide, combined with progressive components and a camera assembly, achieves multi-angle, omnidirectional measurement of the target object. The omnidirectional guide is composed of multiple track arms joined end-to-end to form a circular track, with progressive rings evenly distributed on the surface of the track arms. The progressive components, through dynamic adjustment of the progressive hammer and adaptive hammer core, can slide along the progressive rings, enabling multi-angle adjustment and positional changes of the camera assembly. This design allows the camera assembly to perform omnidirectional scanning around the target object, eliminating the blind spot problem caused by the limited field of view in single-field-of-view measurements.

[0030] Secondly, the camera assembly consists of a calibration camera and a follow-up camera. The calibration camera is fixed to the top of the omnidirectional guide frame for precise calibration of the measurement area, while the follow-up camera, connected to the progressive hammer, slides along the track with the progressive assembly to perform real-time measurements of the target object. Through the dynamic adjustment of the progressive assembly, the follow-up camera can cover different angles of the target object, achieving omnidirectional, multi-segment deformation data acquisition. This multi-segment measurement method not only comprehensively acquires the three-dimensional deformation information of the target object but also significantly improves the accuracy and reliability of the measurement results.

[0031] Furthermore, the device utilizes a combination of a progressive hammer and an air reservoir to achieve the sliding and resetting of the progressive hammer through inflation and deflation, providing highly efficient dynamic adjustment capabilities. This design, while ensuring measurement accuracy, enhances the device's flexibility and environmental adaptability, enabling it to adapt to more complex measurement scenarios, particularly demonstrating unique advantages in the measurement of circumferential objects or integral structural components.

[0032] In summary, the multi-angle, omnidirectional DIC measurement device overcomes the blind spot problem of traditional single-field-of-view measurement by organically combining an omnidirectional guide frame, progressive components, and camera components with multi-segment measurement, achieving omnidirectional coverage measurement of the target object. This device not only improves the comprehensiveness and reliability of the measurement but also expands the application scenarios of DIC technology, providing more accurate and efficient solutions for industrial inspection, materials science research, and engineering structure evaluation, demonstrating significant technological value and broad application prospects. Attached Figure Description

[0033] Figure 1 A schematic diagram of the overall structure of the present invention is shown;

[0034] Figure 2 A schematic diagram of the structure of the present invention combined with the observation station is shown;

[0035] Figure 3 A three-dimensional structural schematic diagram of the omnidirectional guide frame of the present invention is shown;

[0036] Figure 4 This diagram illustrates the structure of the progressive component combined with the servo camera in this invention.

[0037] Figure 5 A three-dimensional structural schematic diagram of the progressive component in this invention is shown;

[0038] Figure 6 A top view of the progressive component in this invention is shown;

[0039] Figure 7 It shows Figure 6 Schematic diagram of the structure of the AA part;

[0040] Figure 8 A three-dimensional structural schematic diagram of the progressive hammer in this invention is shown;

[0041] Figure 9 A three-dimensional structural schematic diagram of the adaptive hammer core in this invention is shown;

[0042] Figure 10 A three-dimensional structural schematic diagram of the traveling wheel in this invention is shown;

[0043] Figure 11 A three-dimensional structural schematic diagram of the servo camera in this invention is shown;

[0044] Figure 12 A three-dimensional structural schematic diagram of the spring in this invention is shown;

[0045] The diagram shows: 1. All-around guide frame; 11. Track arm; 111. Progressive ring; 112. Shock absorber strip; 2. Camera assembly; 21. Calibration camera; 22. Follow-up camera; 221. Stabilizing plate; 222. Stabilizing clamp; 223. Locking bolt; 224. Fixed slider; 225. Limiting shaft; 226. Moving slider; 227. Rotating table; 228. Measuring camera; 3. Progressive assembly; 31. Progressive hammer; 311. Locking rod; 312. Locking hole; 313. Slide groove; 314. Semicircular groove; 315. Progressive shaft; 32. Adaptive hammer core; 321. Standard ruler; 322. Air bladder; 323. Air injection port; 33. Traveling wheel; 331. Rolling groove; 332. Traveling slope; 34. Clamping spring; 4. Observation platform; 5. Enclosure. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0047] Example 1

[0048] Please refer to the instruction manual appendix. Figure 1-12 To address the lack of a device in the prior art capable of multi-angle, omnidirectional camera installation and dynamic DIC (Digital Image Correlation) measurement, this invention provides a technical solution: a device for multi-angle, omnidirectional camera installation and DIC measurement, comprising a frame 5, an observation platform 4 disposed inside the frame 5, an omnidirectional guide 1 mounted on the inner periphery of the frame 5, a camera assembly 2 and a progressive component 3 arranged around the omnidirectional guide 1, the camera assembly 2 performing real-time measurement of an object fixed on the observation platform 4, and the progressive component 3 dynamically adjusting the camera assembly 2 at multiple angles to achieve multi-angle, omnidirectional measurement requirements.

[0049] In this invention, the omnidirectional guide frame 1 includes a track arm 11 extending along an inner circular path. The track arm 11 is disposed within the frame 5, and multiple track arms 11 are spliced ​​together to form an annular disk surface for fixing the progressive component 3. The surface of the track arm 11 is uniformly distributed with through progressive rings 111. The cross-section of each progressive ring 111 is semi-circular, and the progressive rings 111 are distributed along the inner edge of the track arm 11. Multiple progressive rings 111 are provided, and a sandwich layer for clamping the progressive component 3 is formed between adjacent annular disk surfaces. The progressive component 3 is slidably adjusted through the sandwich layer between the progressive rings 111, thereby realizing the dynamic multi-angle movement of the camera component 2.

[0050] Camera assembly 2 includes a calibration camera 21 and a follow-up camera 22. The calibration camera 21 is detachably mounted on the top of the inner ring of the omnidirectional guide 1. The calibration camera 21 is located in a fixed position within the omnidirectional guide 1 and is adjustable to allow for adjustment of its angle and position according to measurement requirements. The follow-up camera 22 is connected to the progressive assembly 3 and can perform dynamic measurements as the progressive assembly 3 moves, ensuring both flexibility and accuracy in measurement.

[0051] The progressive assembly 3 includes a progressive hammer 31 installed in the interlayer of the progressive rings 111. An umbrella-shaped locking rod 311 extends from the outer periphery of the progressive hammer 31, and is mounted within the progressive rings 111, with a T-shaped adaptive hammer core 32 passing through it. The adaptive hammer core 32 is embedded within the progressive hammer 31, and symmetrically wrapped with independent air reservoirs 322 on both sides. An air inlet is provided on the outer side of each air reservoir 322 for inflation or deflation. A clamping spring 34 is tightly clamped between the end of the air reservoir 322 and the inner wall of the progressive hammer 31. The clamping spring 34 can be compressed and reset as the air reservoir 322 is inflated or deflated, thereby achieving smooth sliding of the progressive hammer 31 within the progressive rings 111.

[0052] When multi-angle measurements are required, the progressive assembly 3 changes the force state of the progressive hammer 31 by adjusting the inflation amount of the air reservoir 322, causing it to slide along the progressive ring 111 and move the follow-up camera 22 to the target position for measurement. Simultaneously, the calibration camera 21 can achieve precise calibration of the measurement area by adjusting its installation position. The entire device, through the cooperation of the progressive assembly 3 and the omnidirectional guide frame 1, not only enables multi-angle, omnidirectional dynamic adjustment of the camera assembly 2, but also ensures the stability and accuracy of the measurement.

[0053] This invention achieves multi-angle, all-round camera installation and DIC measurement functions through the collaborative design of the omnidirectional guide frame 1, progressive component 3 and camera component 2. It is compact in structure and easy to operate, and can adapt to the needs of various complex measurement scenarios, providing efficient technical support for industrial measurement, experimental research and other fields.

[0054] Furthermore, the outer circumferential surface of the progressive hammer 31 is provided with eight through semi-circular grooves 314, evenly distributed below the locking rod 311. A progressive shaft 315 is erected in the semi-circular groove 314, and a traveling wheel 33 is rotatably mounted thereon. The traveling wheel 33 can roll along the inner wall of the omnidirectional guide frame 1. The outer circumferential surface of the traveling wheel 33 has semi-circular rolling grooves 331 and traveling ramps 332 evenly spaced. The rolling grooves 331 are adapted to the wire diameter of the clamping spring 34, allowing them to rotate with the reciprocating motion of the clamping spring 34. The surface of the traveling ramp 332 is coated with an anti-slip coating, enabling smooth rolling within the omnidirectional guide frame 1 and improving the operational stability of the device.

[0055] To ensure smooth movement of the progressive hammer 31, the end of the locking rod 311 is rotatably mounted in the progressive ring 111, allowing it to rotate synchronously with the progressive hammer 31. Elastic damping strips 112 are fitted onto the surface of the track arm 11, located on the upper and lower surfaces of the progressive ring 111. These strips effectively buffer vibrations that may occur during movement, further enhancing measurement stability and the durability of the device.

[0056] It should be noted that the progressive hammer 31 has through-slots 313 evenly distributed on its upper and lower end faces. A locking hole 312 is located at the center of the outer surface of each slot 313. A trapezoidal adjusting scale extends from the slot 313 onto the progressive hammer 31. The trapezoidal adjusting scale can be displaced by the inflation or deflation of the air bladders 322 on both sides, compressing the clamping springs 34, for real-time dynamic calibration. Through the design of the trapezoidal adjusting scale, the working position of the progressive hammer 31 can be dynamically adjusted according to measurement requirements, further improving the flexibility of measurement.

[0057] In Example 2, please refer to the appendix to the instruction manual. Figure 1-11 To increase the accuracy of the DIC measurement process, the follow-up camera 22 includes a locking plate and a fixed slider 224. Multiple stabilizing clamps 222 are detachably inserted between the locking plate and the fixed slider 224, forming a support for mounting the progressive ring 111. A locking bolt 223 is inserted into the inner wall of the locking plate, engaging with the locking hole 312 to achieve a detachable connection between the progressive component 3 and the follow-up camera 22. A limiting shaft 225 passes through the fixed slider 224, and a movable slider 226 is sleeved on the limiting shaft 225. A measuring camera 228 is fitted to the end face of the movable slider 226. A rotating stage 227 is sandwiched between the movable slider 226 and the measuring camera 228. The rotating stage 227 can independently adjust the rotation angle of the measuring camera 228 pointing towards the observation platform 4, allowing it to rotate within a certain range to adapt to different measurement scenarios, thus achieving more flexible measurement angle selection.

[0058] Furthermore, the surface of the track arm 11 is provided with through triangular holes. These holes reduce the weight of the track arm 11 and prevent stress concentration. The track arm 11 can be made of aluminum alloy, which has high overall strength and a hollow structure, resulting in a lighter overall weight. This design increases the ease of movement and service life of the omnidirectional guide frame 1, thereby improving the structural strength and service life of the device. Through this design, the device achieves lightweight construction while maintaining high strength, facilitating installation and use.

[0059] Working principle and usage process of this invention:

[0060] 1. Detection

[0061] Before the stitching process begins, the system first uses camera assembly 2 to perform preliminary detection of the objects on observation platform 4. Calibration camera 21 and follow-up camera 22 are dynamically adjusted via omnidirectional guide 1 to ensure coverage of all viewpoints of the target object. The main task of the detection phase is to extract feature points from the object's surface and identify key feature points using computer vision algorithms (such as SIFT and SURF), providing a foundation for subsequent image stitching and 3D reconstruction.

[0062] 2. Initialization

[0063] The initialization phase is the starting point for the stitching process, and its main purpose is to establish the initial 3D coordinate system and basic view. The calibration camera 21 is calibrated in a fixed position on the omnidirectional guide frame 1 to determine the camera's intrinsic and extrinsic parameters under the initial viewpoint. The detected feature points are matched using the initial image to generate a preliminary 3D point cloud. At this stage, the quality of the initial point cloud directly determines the accuracy of subsequent stitching.

[0064] 3. Add a new image

[0065] After initialization, the servo camera 22 slides along the progressive ring 111 to a new position through the dynamic adjustment of the progressive component 3, acquiring a new viewpoint image. The acquisition of the new image needs to cover the unobserved area, while ensuring sufficient overlap of feature points with the existing image for subsequent stitching and 3D reconstruction.

[0066] 4. Estimate camera attitude

[0067] After a new image is added, the system uses a feature point matching algorithm to compare the feature points in the new image with those in the existing images. Based on the matching results, the PnP (Perspective-n-Point) algorithm is used to estimate the camera's pose changes, including the camera's rotation and translation parameters, thereby determining the position and orientation of the new image in three-dimensional space.

[0068] 5. New points of triangulation

[0069] After camera pose estimation is completed, the system performs triangulation on feature points in the new image using multi-view geometry principles. The purpose of triangulation is to calculate the coordinates of these feature points in 3D space based on the feature point matching results from multiple viewpoints. This stage transforms the feature points in the new image into a new 3D point cloud, gradually expanding the initial 3D model.

[0070] 6. Update and rebuild

[0071] The new point cloud obtained through triangulation is integrated with the existing point cloud to update the 3D reconstruction model. This process requires aligning and merging the old and new point clouds to ensure consistency between the newly added point cloud and the original model in the spatial coordinate system. The update and reconstruction phase is a crucial step in gradually improving the 3D model.

[0072] 7. Optimization

[0073] After the point cloud is updated, the system performs local optimization on the entire 3D model. The purpose of optimization is to eliminate accumulated biases caused by camera pose estimation errors, feature point matching errors, etc. Common optimization methods include Bundle Adjustment (BA), which optimizes camera parameters and 3D point cloud coordinates by minimizing reprojection errors.

[0074] 8. Iteration

[0075] The above process is an iterative one. Each time a new image is added, camera pose estimation, triangulation, reconstruction, and optimization need to be performed again. Through multiple iterations, the 3D model is gradually improved until all images have been processed or the preset accuracy requirements have been met.

[0076] 9. Global Optimization

[0077] After all image processing is complete, the system performs global optimization on the entire 3D model. The purpose of global optimization is to further eliminate the cumulative effect of local errors by uniformly adjusting all camera parameters and 3D point cloud coordinates, thus ensuring the overall accuracy and consistency of the 3D model. Global optimization typically employs a global BA algorithm, combined with global constraints in multi-view geometry, to obtain the optimal solution.

[0078] process

[0079] S1. Preparation: Reset the follow-up camera 22 to the midpoint of the progressive ring 111, and check whether the omnidirectional guide 1 is secure and locked.

[0080] S2. Loading: Fix the object to be measured to the outer circumference of the observation platform 4, and send the observation platform 4 into the omnidirectional guide frame 1;

[0081] S3. Calibration Measurement: Calibration camera 21 is activated, and images are added in real time;

[0082] S4. First follow-up measurement: Follow-up camera 22 starts, and images are added in real time;

[0083] S5. Second follow-up measurement: The left air inlet stops injecting air, the left air bladder 322 remains empty, the left clamping spring 34 remains stationary, the right air inlet draws air, the right air bladder 322 contracts synchronously, the right clamping spring 34 extends simultaneously due to depressurization, the right clamping spring 34 pulls the right-side travel wheel 33 to move, driving the progressive component 3 to move counterclockwise along the progressive ring 111, and the second follow-up measurement is performed.

[0084] S6. Third follow-up measurement: The left air inlet is filled with air, the left air bladder 322 expands, the left clamping spring 34 is compressed back synchronously, the right air inlet stops filling with air, the right air bladder 322 remains empty, the right clamping spring 34 does not move, the left clamping spring 34 pulls the travel wheel 33 to move, driving the progressive component 3 to move counterclockwise along the progressive ring 111, and the third follow-up measurement is performed.

[0085] S7. Fourth follow-up measurement: Air is drawn from the left air inlet, the left air bladder 322 contracts, the left clamping spring 34 extends synchronously due to depressurization, air is injected from the right air inlet, the right air bladder 322 expands, the right clamping spring 34 is compressed back, the left clamping spring 34 pulls the travel wheel 33 to move and drive the progressive component 3 to move clockwise along the progressive ring 111 to return to its original position, and the fourth follow-up measurement is performed.

[0086] S8. Measurement Results: After step S7 is completed, all gas injection ports stop injecting and evacuating gas, and the measurement results of all cameras are uploaded at the same time. The server receives the data and calculates the solution.

[0087] S9. Unloading: Remove the object to be measured from the outer periphery of the observation platform 4 and pull the observation platform 4 away from the omnidirectional guide frame 1.

[0088] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A device for multi-angle, omnidirectional camera mounting and DIC measurement, comprising a frame (5), wherein an observation platform (4) is provided inside the frame (5), characterized in that, The inner perimeter of the enclosure (5) is provided with an all-round guide frame (1), and a camera assembly (2) and a progressive assembly (3) are provided on its upper ring. The camera assembly (2) performs real-time measurement of the fixed object on the observation platform (4), and the progressive assembly (3) performs dynamic multi-angle adjustment of the camera assembly (2). The omnidirectional guide frame (1) includes a track arm (11) extending along the inner circular path. The track arm (11) is set in the enclosure (5). There are multiple track arms (11). The multiple track arms (11) are spliced ​​end to end to form an annular disk surface for fixing the progressive component (3). The surface of the track arm (11) is evenly distributed with through progressive rings (111). The cross section of the progressive ring (111) is semi-circular. The progressive rings (111) are distributed along the inner edge direction of the track arm (11). There are multiple progressive rings (111). An interlayer for clamping the progressive component (3) is formed between the progressive rings (111) of adjacent annular disk surfaces. The camera assembly (2) includes a calibration camera (21) and a follow-up camera (22). The calibration camera (21) is detachably mounted on the top of the inner ring of the omnidirectional guide (1). The calibration camera (21) is located in an adjustable fixed position in the omnidirectional guide (1). The progressive assembly (3) includes a progressive hammer (31) installed between the progressive rings (111). The progressive hammer (31) has an umbrella-shaped locking rod (311) extending from its outer periphery and mounted in the progressive ring (111). A T-shaped adaptive hammer core (32) is inserted inside the progressive hammer (31). The adaptive hammer core (32) is embedded in the progressive hammer (31) and has independent air storage bags (322) symmetrically wrapped on both sides. An air injection port is provided on its outer side for inflation and deflation. A clamping spring (34) is tightly clamped between the end of the air storage bag (322) and the inner wall of the progressive hammer (31). It can be reset by the inflation, deflation and compression of the two air storage bags (322). A follow-up camera (22) is connected to the progressive hammer (31) and can slide along the progressive ring (111) with the progressive hammer (31).

2. The device for multi-angle, omnidirectional camera mounting and DIC measurement according to claim 1, characterized in that: The outer circumferential surface of the progressive hammer (31) is provided with a through semi-circular groove (314). There are eight semi-circular grooves (314), and the eight semi-circular grooves (314) are conveniently located below the locking rod (311). A progressive shaft (315) is provided in the semi-circular groove (314), and a traveling wheel (33) is rotatably provided, which can roll along the inner wall of the all-round guide frame (1).

3. The device for multi-angle, omnidirectional camera mounting and DIC measurement according to claim 2, characterized in that: The outer circumferential surface of the traveling wheel (33) is provided with semi-circular rolling grooves (331) and traveling ramps (332) at equal intervals. These grooves are adapted to the wire diameter of the clamping spring (34) and can rotate with the reciprocating motion of the clamping spring (34). The surface of the traveling ramp (332) is fitted with an anti-slip coating and can roll along with the omnidirectional guide frame (1).

4. The device for multi-angle, omnidirectional camera mounting and DIC measurement according to claim 3, characterized in that: The progressive hammer (31) has through grooves (313) evenly distributed on its upper and lower end faces, and a locking hole (312) is provided at the center of its outer face. The progressive hammer (31) is provided with a trapezoidal adjustment ruler extending from the groove (313), which can be dynamically calibrated in real time as the air storage bags (322) on both sides are inflated, deflated, and squeezed by the clamping spring (34).

5. The device for multi-angle, omnidirectional camera mounting and DIC measurement according to claim 4, characterized in that: The follow-up camera (22) includes a locking plate and a fixed slider (224). Multiple stabilizing clips (222) are detachably inserted between the locking plate and the fixed slider (224), forming a bracket for mounting the progressive ring (111). A locking bolt (223) is inserted into the inner wall of the locking plate, which engages with the locking hole (312) for detachable connection between the progressive component (3) and the follow-up camera (22). A limiting shaft (225) is inserted through the fixed slider (224), and a movable slider (226) is sleeved along the shaft. A measuring camera (228) is fitted to the end face of the movable slider (226).

6. The device for multi-angle, omnidirectional camera mounting and DIC measurement according to claim 5, characterized in that: A rotating platform (227) is provided between the movable slider (226) and the measuring camera (228), which can independently adjust the rotation angle of the measuring camera (228) pointing towards the observation platform (4).

7. The device for multi-angle, omnidirectional camera mounting and DIC measurement according to claim 6, characterized in that: The locking rod (311) is rotatably mounted in the progressive ring (111) and can rotate synchronously with the progressive hammer (31) as it moves.

8. The device for multi-angle, omnidirectional camera mounting and DIC measurement according to claim 7, characterized in that: The surface of the track arm (11) is fitted with elastic damping strips (112), which are disposed on the upper and lower surfaces of the progressive ring (111).

9. The device for multi-angle, omnidirectional camera mounting and DIC measurement according to claim 8, characterized in that: The surface of the track arm (11) is provided with through triangular holes to reduce weight and stress concentration.

10. The measurement method of the device for multi-angle, omnidirectional camera mounting and DIC measurement according to any one of claims 1-9, characterized in that: Includes the following steps: S1. Preparation: Reset the follow-up camera (22) to the midpoint of the progressive ring (111), and check whether the omnidirectional guide (1) is secure and locked. S2. Loading: Fix the object to be measured to the outer circumference of the observation table (4) and send the observation table (4) into the omnidirectional guide frame (1); S3. Calibration Measurement: The calibration camera (21) is started, and images are added instantly; S4. First follow-up measurement: The follow-up camera (22) is started, and the image is added in real time; S5. Second follow-up measurement: The left air inlet stops injecting air, the left air bladder (322) remains empty, the left clamping spring (34) remains stationary, the right air inlet draws air, the right air bladder (322) contracts synchronously, the right clamping spring (34) extends simultaneously due to depressurization, the right clamping spring (34) pulls the right-side travel wheel (33) to move and drive the progressive component (3) to move counterclockwise along the progressive ring (111), and the second follow-up measurement is performed; S6. Third follow-up measurement: The left air inlet is filled with air, the left air bladder (322) expands, the left clamping spring (34) is compressed back synchronously, the right air inlet stops filling with air, the right air bladder (322) remains empty, the right clamping spring (34) does not move, the left clamping spring (34) pulls the travel wheel (33) to move and drive the progressive component (3) to move counterclockwise along the progressive ring (111), and the third follow-up measurement is performed; S7. Fourth follow-up measurement: The left air inlet is evacuated, the left air bladder (322) contracts, the left clamping spring (34) expands synchronously due to pressure loss, the right air inlet is inflated, the right air bladder (322) expands, the right clamping spring (34) is compressed back, the left clamping spring (34) pulls the travel wheel (33) to move and drive the progressive component (3) to move clockwise along the progressive ring (111) to return to its original position, and the fourth follow-up measurement is performed; S8. Measurement Results: After step S7 is completed, all gas injection ports stop injecting and evacuating gas, and the measurement results of all cameras are uploaded at the same time. The server receives the data and calculates the solution. S9. Unloading: Remove the object to be measured from the outer periphery of the observation table (4) and remove the observation table (4) from the omnidirectional guide frame (1).

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