Method and device for multi-angle and all-dimensional camera installation and DIC measurement

Abstract

The invention relates to a multi-angle and all-directional camera installation and DIC measurement device which comprises a surrounding frame, an observation platform is arranged in the surrounding frame, an all-directional guide frame is erected on the inner periphery of the surrounding frame, and a camera assembly and a progressive assembly are annularly arranged on the all-directional guide frame. The camera assembly is used for measuring an observed object in real time, and the progressive assembly realizes dynamic multi-angle adjustment of the camera assembly; the omni-directional guide frame is formed by splicing a plurality of rail arms end to end to form an annular disc face, and progressive rings with semicircular sections are evenly distributed on the surfaces of the rail arms. The camera assembly comprises a calibration camera and a follow-up camera; the follow-up camera is connected with the progressive assembly; the progressive assembly is composed of a progressive hammer, an umbrella-shaped locking rod is arranged on the periphery of the hammer, a T-shaped self-adaptive hammer core penetrates through the hammer, air storage bags symmetrically wrap the two sides of the hammer core, air is inflated or exhausted through an air injection port, and clamping springs are clamped between the air storage bags and the inner wall of the hammer and can reset along with changes of the air bags to drive a follow-up camera to slide along a progressive ring, so that dynamic adjustment is achieved. The problem of a blind area caused by view angle limitation in single-view-field measurement is eliminated.

Description

Technical Field

[0001] The invention belongs to the technical field of non-contact measurement, and in particular relates to a method and a device for multi-angle and omnidirectional camera installation and DIC measurement. Background Art

[0002] With the rapid development of science and technology, non-contact measurement technology has shown broad application prospects in many fields. Especially in the fields of industry, materials science and medicine, the demand for accurate and comprehensive surface deformation measurement of objects is becoming increasingly urgent. Although traditional contact measurement methods are still effective in some scenarios, their limitations are obvious. Contact measurement is not only easy to cause interference or damage to the object being measured, but also has limited application in complex structures, flexible materials or dynamic environments. Therefore, non-contact measurement technology came into being and quickly became an important tool in the field of deformation measurement.

[0003] As a representative of non-contact measurement technology, digital image correlation (DIC) has gradually become the preferred technology in industrial testing, material performance analysis, and medical imaging due to its advantages such as non-contact, three-dimensional deformation information acquisition, simple optical path, good environmental adaptability, and wide measurement range. Compared with contact measurement, DIC can obtain 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 automobiles and aviation that have extremely high requirements for the performance of structural parts, and can provide an important basis for stress and strain analysis of key components.

[0004] However, existing DIC technology is mainly focused on single-field measurement, which means that it can only analyze local data of the target object and cannot achieve all-round measurement of the entire object. This limitation may lead to incomplete measurement results in some application scenarios, which in turn affects the evaluation of the overall performance of the target object. This limitation is particularly prominent in the measurement of circular objects and integral structural parts, which can easily lead to measurement blind spots and seriously affect the accurate evaluation of the overall performance of the target object. For this reason, solving the field of view blind spot problem in DIC measurement has become a key goal of industry development. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a method and device for multi-angle and omnidirectional camera installation and DIC measurement. The specific technical solution is as follows:

[0006] The present invention provides a multi-angle, omnidirectional camera installation and DIC measurement device, comprising a frame, an observation platform is arranged inside the frame, an omnidirectional guide frame is arranged on the inner periphery of the frame, a camera assembly and a progressive assembly are arranged on the upper ring, the camera assembly performs instant measurement on an object fixed on the observation platform, and the progressive assembly performs dynamic multi-angle adjustment on the camera assembly;

[0007] The omnidirectional guide frame includes a track arm extending along an inner circular path, the track arm is arranged in the enclosure, and a plurality of track arms are provided, and the plurality of track arms are spliced ​​end to end to form an annular disk surface for fixing the progressive assembly, and the surface of the track arm is uniformly provided with penetrating progressive rings, and the cross-section of the progressive rings is semicircular, and the progressive rings are distributed along the inner edge direction of the track arm, and a plurality of progressive rings are provided, and a sandwich for clamping the progressive assembly is formed between the progressive rings of adjacent parallel annular disk surfaces;

[0008] The camera assembly includes a calibration camera and a follow-up camera, wherein the calibration camera is detachably arranged on the top of the inner ring of the omnidirectional guide frame, and the calibration camera is arranged in an adjustable fixed position in the omnidirectional guide frame;

[0009] The progressive component includes a progressive hammer installed between the progressive rings, an umbrella-shaped locking rod is provided on the outer circumference of the progressive hammer and is mounted in the progressive ring, a T-shaped adaptive hammer core is inserted therein, the adaptive hammer core is embedded in the progressive hammer and symmetrically wrapped with independent air bags on both sides, an air injection port is provided on the outer side for inflation and deflating, and a clamping spring is tightly clamped between the end of the air bag and the inner wall of the progressive hammer, which can be reset with the inflation, deflating, squeezing and pressing of the air bags on both sides, and 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 technical solution of the present invention, the outer circumferential surface of the progressive hammer is provided with penetrating semicircular grooves, eight of which are provided and conveniently located below the locking rod. A progressive shaft is vertically provided in the semicircular groove, and a traveling wheel is rotatably provided therein so as to roll along the inner wall of the omnidirectional guide frame.

[0011] As a preferred technical solution of the present invention, the outer circumferential surface of the traveling wheel is provided with semicircular rolling grooves and traveling slopes at equal distances, which are adapted to the wire diameter of the clamp spring and can rotate with the reciprocating motion of the clamp spring. The surface of the traveling slope is fitted with an anti-slip coating and can roll with the omnidirectional guide frame.

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

[0013] As a preferred technical solution of the present invention, the follow-up camera includes a locking plate and a fixed slider, a plurality of stabilizing clips are detachably inserted between the locking plate and the fixed slider, and a bracket for mounting the progressive ring is formed therebetween; a locking bolt is inserted into the inner wall of the locking plate, and is plugged into and removed from the locking hole for detachable connection between the progressive assembly and the follow-up camera; a limiting shaft is inserted into the fixed slider, and a moving slider is provided along the shaft sleeve, and a measuring camera is fitted on the end surface of the moving slider.

[0014] As a preferred technical solution of the present invention, a rotating platform is provided between the movable slider and the measuring camera, and the rotating angle of the measuring camera pointing to the observation platform can be independently adjusted.

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

[0016] As a preferred technical solution of the present invention, elastic shock-absorbing strips are provided on the surface of the track arm, and the shock-absorbing strips are provided on the upper and lower surfaces of the progressive ring.

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

[0018] As a preferred technical solution of the present invention, a multi-angle, omnidirectional 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 whether the omnidirectional guide is secure and locked;

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

[0021] S3. Calibration measurement: The calibration camera is started and images are added for instant measurement;

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

[0023] S5. Second follow-up measurement: stop injecting gas from the left gas injection port, keep the left air bag empty, keep the left clamp spring still, evacuate gas from the right gas injection port, shrink the right air bag synchronously, and simultaneously extend the right clamp spring without pressure. The right clamp spring pulls the right traveling wheel to drive the progressive assembly to move counterclockwise along the progressive ring, and perform the second follow-up measurement;

[0024] S6. The third follow-up measurement: the left air injection port is filled with air, the left air storage bag expands, the left clamp spring is compressed back synchronously, the right air injection port stops filling with air, the right air storage bag remains empty, the right clamp spring does not move, the left clamp spring pulls the travel wheel to move the progressive assembly counterclockwise along the progressive ring, and the third follow-up measurement is performed;

[0025] S7. The fourth follow-up measurement: the left air injection port is evacuated, the left air storage bag is contracted, the left clamp spring is synchronously depressurized and extended, the right air injection port is filled with air, the right air storage bag is expanded, the right clamp spring is compressed and returned, the left clamp spring pulls the traveling wheel to move, and the progressive assembly moves 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, all gas injection ports stop injecting and pumping gas, and upload the measurement results of all cameras 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 surface of the observation platform and remove the observation platform from the omnidirectional guide frame

[0028] The beneficial effects of the present invention are:

[0029] The present invention overcomes the shortcomings of traditional technologies through multi-segment measurement and shows significant beneficial effects. First, the device realizes multi-angle and all-round measurement of the target object through the design of the surrounding frame and the omnidirectional guide frame, combined with the progressive component and the camera component. The omnidirectional guide frame is composed of multiple track arms spliced ​​end to end to form a circular track, and progressive rings are evenly distributed on the surface of the track arm. The progressive component can slide along the progressive ring through the dynamic adjustment of the progressive hammer and the adaptive hammer core to achieve multi-angle adjustment and position change of the camera component. This design enables the camera component to perform an all-round scan around the target object, eliminating the blind spot problem caused by the viewing angle limitation in single-field measurement.

[0030] Secondly, the camera assembly consists of a calibration camera and a follow-up camera. The calibration camera is fixed on the top of the omnidirectional guide frame and is used to accurately calibrate the measurement area. The follow-up camera can slide along the track with the progressive assembly through the connection with the progressive hammer to measure the target object in real time. Through the dynamic adjustment of the progressive assembly, the follow-up camera can cover different angles of the target object and realize all-round and multi-segment deformation data collection. This multi-segment measurement method can not only fully obtain the three-dimensional deformation information of the target object, but also significantly improve the accuracy and reliability of the measurement results.

[0031] In addition, the device combines the progressive hammer with the air storage bag, uses inflation and degassing to achieve the sliding and resetting of the progressive hammer, and has efficient dynamic adjustment capabilities. This design improves the flexibility and environmental adaptability of the device while ensuring measurement accuracy, enabling it to adapt to more complex measurement scenarios, especially in the measurement of circular objects or integral structural parts.

[0032] In summary, the multi-angle, all-round DIC measurement device overcomes the blind spot problem of traditional single-field measurement through the organic combination of all-round guides, progressive components and camera components and multi-segment measurement, and realizes all-round coverage measurement of the target object. This device not only improves the comprehensiveness and reliability of measurement, but also expands the application scenarios of DIC technology, providing more accurate and efficient solutions for industrial inspection, material science research and engineering structure evaluation, and has important technical value and broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 The overall structural diagram of the present invention is shown;

[0034] Figure 2 A schematic diagram showing the structure of the present invention combined with an observation platform;

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

[0036] Figure 4 A schematic diagram showing the structure of the combination of the progressive assembly and the follow-up camera in the present invention is shown;

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

[0038] Figure 6 A top view of a progressive assembly of the present invention is shown;

[0039] Figure 7 Shows Figure 6 Schematic diagram of the structure of the AA site;

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

[0041] Fig. 9 A schematic diagram of the three-dimensional structure of the adaptive hammer core in the present invention is shown;

[0042] Fig.10 A schematic diagram of the three-dimensional structure of the traveling wheel in the present invention is shown;

[0043] Fig.11 A schematic diagram of the three-dimensional structure of the follow-up camera in the present invention is shown;

[0044] Fig.12 The three-dimensional structure schematic diagram of the family reed in the present invention is shown;

[0045] As shown in the figure: 1. All-round guide frame; 11. Track arm; 111. Progressive ring; 112. Shock-absorbing strip; 2. Camera assembly; 21. Calibration camera; 22. Follow-up camera; 221. Stabilizing plate; 222. Stabilizing clamp; 223. Locking bolt; 224. Fixed slide block; 225. Limiting shaft; 226. Moving slide block; 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. Ruler; 322. Air storage bag; 323. Air injection hole; 33. Travel wheel; 331. Rolling groove; 332. Travel slope; 34. Clip spring; 4. Observation platform; 5. Enclosure. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0047] Embodiment 1

[0048] Please refer to the instruction manual Figure 1-12 In order to solve the problem that there is a lack of a device that can realize multi-angle, omnidirectional camera installation and dynamic DIC (digital image correlation) measurement in the prior art, the present invention provides a technical solution: a multi-angle, omnidirectional camera installation and DIC measurement device, comprising a frame 5, an observation platform 4 is arranged inside the frame 5, an omnidirectional guide frame 1 is arranged on the inner periphery of the frame 5, a camera assembly 2 and a progressive assembly 3 are arranged on the omnidirectional guide frame 1, the camera assembly 2 performs real-time measurement of objects fixed on the observation platform 4, and the progressive assembly 3 performs dynamic multi-angle adjustment on the camera assembly 2 to realize multi-angle, omnidirectional measurement requirements.

[0049] In the present invention, the omnidirectional guide frame 1 includes a track arm 11 extending along an inner circular path, the track arm 11 is arranged in the enclosure 5, and the track arm 11 is formed by multiple head-to-tail splicing to form an annular disk surface for fixing the progressive assembly 3. The surface of the track arm 11 is evenly provided with progressive rings 111 penetrating therethrough, the cross section of the progressive rings 111 is semicircular, the progressive rings 111 are distributed along the inner edge direction of the track arm 11, and there are multiple progressive rings 111, and a sandwich for clamping the progressive assembly 3 is formed between the progressive rings 111 of adjacent and parallel annular disk surfaces. The progressive assembly 3 is slidably adjusted through the sandwich between the progressive rings 111, thereby realizing dynamic multi-angle movement of the camera assembly 2.

[0050] The camera assembly 2 includes a calibration camera 21 and a follow-up camera 22. The calibration camera 21 is detachably arranged at the top of the inner ring of the omnidirectional guide frame 1. The calibration camera 21 is adjustable at a fixed position in the omnidirectional guide frame 1, so that the angle and position of the calibration camera 21 can be adjusted according to the measurement requirements. The follow-up camera 22 is connected to the progressive assembly 3 and can perform dynamic measurement with the movement of the progressive assembly 3, ensuring the flexibility and accuracy of the measurement.

[0051] The progressive assembly 3 includes a progressive hammer 31 installed in the interlayer of the progressive ring 111. An umbrella-shaped locking rod 311 is provided on the outer periphery of the progressive hammer 31. The locking rod 311 is mounted in the progressive ring 111, and a T-shaped adaptive hammer core 32 is inserted therein. The adaptive hammer core 32 is embedded in the progressive hammer 31, and independent air storage bags 322 are symmetrically wrapped on both sides. The outer side of the air storage bag 322 is provided with an air injection port for inflation or degassing. A clamp spring 34 is tightly clamped between the end of the air storage bag 322 and the inner wall of the progressive hammer 31. The clamp spring 34 can be squeezed and reset with the inflation or degassing of the air storage bag 322, so as to realize the smooth sliding of the progressive hammer 31 in the progressive ring 111.

[0052] When multi-angle measurement is required, the progressive assembly 3 changes the force state of the progressive hammer 31 by adjusting the inflation amount of the air bag 322, so that it slides along the progressive ring 111, driving the follow-up camera 22 to move to the target position for measurement. At the same time, the calibration camera 21 can achieve accurate calibration of the measurement area by adjusting its installation position. The entire device can not only achieve multi-angle and omnidirectional dynamic adjustment of the camera assembly 2 through the cooperation of the progressive assembly 3 and the omnidirectional guide frame 1, but also ensure the stability and accuracy of the measurement.

[0053] The present invention realizes multi-angle, omnidirectional camera installation and DIC measurement functions through the coordinated design of the omnidirectional guide frame 1, the progressive component 3 and the camera component 2. It has a compact structure and is easy to operate. It can adapt to the needs of various complex measurement scenarios and provides efficient technical support for industrial measurement, experimental research and other fields.

[0054] Furthermore, the outer circumference of the progressive hammer 31 is provided with a semicircular groove 314 that penetrates therethrough. There are eight semicircular grooves 314 that are evenly distributed below the locking rod 311. A progressive shaft 315 is vertically arranged in the semicircular groove 314, and a traveling wheel 33 is rotatably arranged thereon. The traveling wheel 33 can roll along the inner wall of the omnidirectional guide frame 1. Semicircular rolling grooves 331 and traveling slopes 332 are equidistantly arranged on the outer circumference of the traveling wheel 33. The rolling grooves 331 are adapted to the wire diameter of the clamp spring 34 and can rotate with the reciprocating motion of the clamp spring 34. The surface of the traveling slope 332 is fitted with an anti-slip coating, which can achieve smooth rolling in the omnidirectional guide frame 1 and improve the operating stability of the device.

[0055] In order to ensure smooth movement of the progressive hammer 31, the rod end of the locking rod 311 is rotatably mounted in the progressive ring 111, and can rotate synchronously with the movement of the progressive hammer 31. The surface of the track arm 11 is fitted with an elastic shock-absorbing strip 112, which is arranged on the upper and lower surfaces of the progressive ring 111, effectively buffering the vibration that may be generated during the movement, further improving the stability of the measurement and the durability of the device.

[0056] It should be noted that the upper and lower end surfaces of the progressive hammer 31 are evenly provided with a through slide groove 313, the center of the outer facade of the slide groove 313 is provided with a locking hole 312, and the progressive hammer 31 is provided with a trapezoidal adjustment ruler extending from the slide groove 313. The trapezoidal adjustment ruler can be displaced with the inflation or degassing of the air storage bags 322 on both sides to squeeze the clamp spring 34, and is used for real-time dynamic calibration. Through the design of the trapezoidal adjustment ruler, the working position of the progressive hammer 31 can be dynamically adjusted according to the measurement requirements, further improving the flexibility of measurement.

[0057] In Example 2, please refer to the attached Figure 1-11 In order to increase the accuracy during the DIC measurement process, the follow-up camera 22 includes a locking plate and a fixed slider 224. A plurality of stabilizing clips 222 are detachably inserted between the locking plate and the fixed slider 224 to form a bracket for mounting the progressive ring 111. A locking bolt 223 is inserted into the inner wall of the locking plate. The locking bolt 223 is inserted and matched with the locking hole 312 to realize the detachable connection between the progressive assembly 3 and the follow-up camera 22. A limiting shaft 225 is inserted into the fixed slider 224. A moving slider 226 is sleeved on the limiting shaft 225. A measuring camera 228 is fitted on the end surface of the moving slider 226. A rotating platform 227 is sandwiched between the moving slider 226 and the measuring camera 228. The rotating platform 227 can independently adjust the rotation angle of the measuring camera 228 pointing to the observation platform 4, and can rotate within a certain range to adapt to different measurement scenes, thereby realizing a more flexible measurement angle selection.

[0058] Furthermore, the surface of the track arm 11 is provided with penetrating triangular holes, which are used to reduce the weight of the track arm 11 and avoid stress concentration. The track arm 11 can be made of aluminum alloy material, with high overall strength, and a hollow structure with a light overall mass. By increasing the mobility and service life of the omnidirectional guide frame 1, the structural strength and service life of the device are improved. Through this design, the device is lightweight while maintaining high strength, and is easy to install and use.

[0059] The working principle and use process of the present invention:

[0060] 1. Detection

[0061] Before the stitching work begins, the system first uses the camera assembly 2 to perform preliminary detection of the object on the observation platform 4. The calibration camera 21 and the follow-up camera 22 are dynamically adjusted by the omnidirectional guide frame 1 to ensure that all viewing angles of the target object can be covered. The main task of the detection stage is to extract the feature points on the surface of the object and identify the key feature points through computer vision algorithms (such as SIFT, SURF, etc.), providing a basis for subsequent image stitching and 3D reconstruction.

[0062] 2. Initialization

[0063] The initialization phase is the starting point of the stitching work, and its main purpose is to establish the initial three-dimensional coordinate system and basic view. The calibration camera 21 is calibrated at a fixed position of the omnidirectional guide frame 1 to determine the camera's internal and external parameters under the initial viewing angle. The detected feature points are matched through the initial image to generate a preliminary three-dimensional point cloud. At this point, the quality of the initial point cloud directly determines the accuracy of subsequent stitching.

[0064] 3. Add a new image

[0065] After the initialization is completed, the tracking camera 22 slides to a new position along the progressive ring 111 through the dynamic adjustment of the progressive component 3 to obtain a new perspective image. The acquisition of the new image needs to cover the unobserved area and ensure that there is enough overlap of feature points with the existing image for subsequent stitching and three-dimensional reconstruction.

[0066] 4. Estimating Camera Pose

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

[0068] 5. Triangulate new points

[0069] After the camera pose estimation is completed, the system triangulates the feature points in the new image using the principle of multi-view geometry. The purpose of triangulation is to calculate the coordinates of these feature points in three-dimensional space based on the matching results of feature points under multiple perspectives. In this stage, the feature points in the new image will be converted into a new three-dimensional point cloud, gradually expanding the initial three-dimensional model.

[0070] 6. Update and rebuild

[0071] The new point cloud obtained by triangulation is integrated with the existing point cloud to update the 3D reconstruction model. This process requires alignment and fusion of the new and old point clouds to ensure that the newly added point cloud is consistent with the original model in the spatial coordinate system. The update and reconstruction stage is an important step in gradually improving the 3D model.

[0072] 7. Optimization

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

[0074] 8. Iteration

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

[0076] 9. Global Optimization

[0077] After all images are processed, the system will perform 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 to ensure the overall accuracy and consistency of the 3D model. Global optimization usually uses 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, check whether the omnidirectional guide frame 1 is secure and locked;

[0080] S2. Loading: The object to be measured is fixed to the outer peripheral surface of the observation platform 4, and the observation platform 4 is sent to the omnidirectional guide frame 1;

[0081] S3 calibration measurement: calibration camera 21 starts, real-time measurement to add images;

[0082] S4. The first follow-up measurement: the follow-up camera 22 is started, and the image is added for real-time measurement;

[0083] S5. The second follow-up measurement: the left gas injection port stops injecting gas, the left air bag 322 remains empty, the left clip spring 34 does not move, the right gas injection port is evacuated, the right air bag 322 shrinks synchronously, the right clip spring 34 loses pressure and stretches at the same time, the right clip spring 34 pulls the right side of the traveling wheel 33 to move the progressive assembly 3 counterclockwise along the progressive ring 111, and the second follow-up measurement is performed;

[0084] S6. The third follow-up measurement: the left gas injection port is injected, the left air bag 322 expands, the left spring 34 is compressed back synchronously, the right gas injection port stops injecting gas, the right air bag 322 remains empty, the right spring 34 does not move, the left spring 34 pulls the travel wheel 33 to move the progressive assembly 3 counterclockwise along the progressive ring 111, and the third follow-up measurement is performed;

[0085] S7. The fourth follow-up measurement: the left gas injection port is evacuated, the left air bag 322 is contracted, the left clip spring 34 is stretched synchronously without pressure, the right gas injection port is injected, the right air bag 322 is expanded, the right clip spring 34 is compressed back, the left clip spring 34 pulls the travel wheel 33 to move the progressive assembly 3 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, all gas injection ports stop injecting and pumping gas, and upload the measurement results of all cameras at the same time. The server receives the data and calculates the solution;

[0087] S9. Unloading: The object to be measured is removed from the outer peripheral surface of the observation platform 4 , and the observation platform 4 is pulled out of 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 in the protection scope of the present invention.

Claims

1. A multi-angle, omnidirectional camera installation and DIC measurement device, comprising a frame (5), wherein an observation platform (4) is arranged inside the frame (5), characterized in that: An omnidirectional guide frame (1) is arranged on the inner periphery of the enclosure (5), and a camera assembly (2) and a progressive assembly (3) are arranged on the upper ring thereof. The camera assembly (2) performs instant measurement of an object fixed on the observation platform (4), and the progressive assembly (3) performs dynamic multi-angle adjustment on the camera assembly (2); The omnidirectional guide frame (1) comprises a track arm (11) extending along an inner circular path, the track arm (11) being arranged in the surrounding frame (5), a plurality of the track arms (11) being arranged, the plurality of track arms (11) being spliced ​​end to end to form an annular disk surface for fixing the progressive component (3), the surface of the track arm (11) being uniformly provided with penetrating progressive rings (111), the cross section of the progressive rings (111) being semicircular, the progressive rings (111) being distributed along the inner edge direction of the track arm (11), and a plurality of the progressive rings (111) being arranged, and a sandwich for clamping the progressive component (3) being formed between the progressive rings (111) on adjacent parallel annular disk surfaces; The camera assembly (2) comprises a calibration camera (21) and a follow-up camera (22), wherein the calibration camera (21) is detachably arranged at the top of the inner ring of the omnidirectional guide frame (1), and the calibration camera (21) is arranged in an adjustable fixed position in the omnidirectional guide frame (1); The progressive assembly (3) comprises a progressive hammer (31) installed and clamped between the progressive rings (111). An umbrella-shaped locking rod (311) is provided on the outer periphery of the progressive hammer (31) and is mounted in the progressive ring (111). A T-shaped adaptive hammer core (32) is inserted therein. The adaptive hammer core (32) is embedded in the progressive hammer (31) and is symmetrically wrapped with independent air storage bags (322) on both sides. An air injection port is provided on the outer side of the adaptive hammer core (32) for inflation and degassing. 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). The clamping spring can be reset by inflation, degassing, squeezing and resetting the air storage bags (322) on both sides. 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 installation and DIC measurement according to claim 1, characterized in that: The outer circumference of the progressive hammer (31) is provided with a semicircular groove (314) penetrating therethrough, and eight semicircular grooves (314) are provided, and the eight semicircular grooves (314) are conveniently located below the locking rod (311), a progressive shaft (315) is vertically arranged in the semicircular groove (314), and a traveling wheel (33) is rotatably arranged thereon, and can roll along the inner wall of the omnidirectional guide frame (1).

3. The device for multi-angle, omnidirectional camera installation and DIC measurement according to claim 2, characterized in that: The outer circumference of the traveling wheel (33) is provided with semicircular rolling grooves (331) and traveling slopes (332) at equal distances, which are adapted to the wire diameter of the clamp spring (34) and can rotate with the reciprocating motion of the clamp spring (34); the surface of the traveling slope (332) is fitted with an anti-slip coating and can roll with the omnidirectional guide frame (1).

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

5. The device for multi-angle, omnidirectional camera installation and DIC measurement according to claim 4, characterized in that: The follow-up camera (22) comprises a locking plate and a fixed slider (224); a plurality of stabilizing clips (222) are detachably inserted between the locking plate and the fixed slider (224); a bracket for mounting the progressive ring (111) is formed therebetween; a locking bolt (223) is inserted into the inner wall of the locking plate and is engaged with a locking hole (312) for detachable connection between the progressive assembly (3) and the follow-up camera (22); a limiting shaft (225) is inserted into the fixed slider (224); a moving slider (226) is arranged along the shaft sleeve; and a measuring camera (228) is fitted on the end surface of the moving slider (226).

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

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

8. The device for multi-angle, omnidirectional camera installation and DIC measurement according to claim 7, characterized in that: The surface of the track arm (11) is fitted with an elastic shock-absorbing strip (112), and the shock-absorbing strip (112) is arranged on the upper and lower surfaces of the progressive ring (111).

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

10. A multi-angle, omnidirectional camera installation and DIC measurement method according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1. Preparation: Reset the follow-up camera (22) to the midpoint of the progressive ring (111), and check whether the omnidirectional guide frame (1) is secure and locked; S2. Loading: The object to be measured is fixed to the outer peripheral surface of the observation platform (4), and the observation platform (4) is sent to the omnidirectional guide frame (1); S3. Calibration measurement: The calibration camera (21) is started, and the image is added for instant measurement; S4. The first follow-up measurement: the follow-up camera (22) is started, and the image is added for real-time measurement; S5. The second follow-up measurement: the left gas injection port stops injecting gas, the left air bag (322) remains empty, the left clamp spring (34) does not move, the right gas injection port is evacuated, the right air bag (322) contracts synchronously, the right clamp spring (34) loses pressure and stretches at the same time, the right clamp spring (34) pulls the right side of the traveling wheel (33) to move the progressive assembly (3) counterclockwise along the progressive ring (111), and the second follow-up measurement is performed; S6. The third follow-up measurement: the left gas injection port is injected, the left air bag (322) expands, the left clip spring (34) is compressed back synchronously, the right gas injection port stops injecting gas, the right air bag (322) remains empty, the right clip spring (34) does not move, the left clip spring (34) pulls the travel wheel (33) to move the progressive assembly (3) counterclockwise along the progressive ring (111), and the third follow-up measurement is performed; S7. The fourth follow-up measurement: the left gas injection port is evacuated, the left air bag (322) is contracted, the left clamp spring (34) is synchronously decompressed and stretched, the right gas injection port is injected, the right air bag (322) is expanded, the right clamp spring (34) is compressed back, the left clamp spring (34) pulls the travel wheel (33) to move the progressive assembly (3) 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, all gas injection ports stop injecting and pumping gas, and upload the measurement results of all cameras at the same time. The server receives the data and calculates the solution; S9. Unloading: The object to be measured is removed from the outer peripheral surface of the observation platform (4), and the observation platform (4) is pulled away from the omnidirectional guide frame (1).

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