30 results about "Subpixel edge detection" patented technology

The invention discloses an automatic instrument reading method and system based on embedded machine vision. The method comprises the following steps: deploying an embedded image acquisition unit with wide dynamic imaging capability; performing multi-mode preprocessing of white balance correction, contrast enhancement and noise suppression on the image; self-adaptively identifying the instrument type and positioning a key area by using a lightweight convolutional neural network; hough transform and sub-pixel edge detection are adopted for a pointer type instrument to achieve high-precision angle analysis, and optical character recognition is completed for a digital instrument through a bidirectional long-short-term memory network; and finally, fusing multi-frame results through Kalman filtering, evaluating credibility, and outputting stable readings with timestamps. According to the technical scheme, high-robustness, high-precision and low-delay automatic reading can be realized at the embedded end, and the operation stability and the long-term adaptability of the system in a weak network environment are remarkably improved.

The invention relates to the technical field of vertical shaft guide detection, in particular to an industrial intelligent visual detection and diagnosis system for a vertical shaft guide. The coal dust shadow quantization unit extracts a coal dust region by adopting a double-peak self-adaptive threshold segmentation combined region growing algorithm, and introduces a space weight factor to calculate an average gray value and a coverage area proportion, and the dynamic coupling calibration unit depends on a three-dimensional lookup table calibrated by multiple working conditions and nonlinear interpolation; the optimal deviation compensation coefficient of the jitter and coal dust combination is matched, a dynamic gray segmentation threshold value is generated, and a defect diagnosis decision unit accurately calculates the abrasion depth through partition self-adaptive segmentation, multi-scale morphological filtering and denoising and gradient amplitude and curvature double-constrained sub-pixel edge detection. A hierarchical control instruction is output according to the real-time depth and the historical trend, coupling interference is eliminated, the cage guide abrasion detection accuracy is improved, and a reliable basis is provided for safe operation and maintenance.

This invention provides a machine vision-based method and system for measuring the dimensions of circular threads. First, it achieves complete coverage of the entire thread profile by acquiring multiple local images, overcoming the limitation of a single field of view in capturing the entire thread. Second, it extracts the contours of each image frame through sub-pixel edge detection and performs in-depth analysis of feature points within each frame. Subsequently, a feature-constrained stitching model is established to achieve precise alignment and global optimization of data from different fields of view, reducing the error amplification effect caused by geometric mismatch and viewing angle deviation, and suppressing nonlinear errors in parameter accuracy within the measurement range. This method can comprehensively and accurately measure key parameters of circular threads (such as taper, pitch, thread profile variation, and minimum effective connection length). This method not only significantly improves the overall accuracy and reliability of thread measurement but also provides a solid technical guarantee for the safety and durability of oil well pipeline connections, and has important reference value for research and application in related fields.

The application discloses a kind of based on industrial CT image blade wall thickness size subpixel level measurement method and system, method includes obtaining the scanning CT image of turbine blade part to be measured;The edge of turbine blade in scanning CT image is extracted using pixel level edge detection algorithm, and the coarse positioning edge position of blade is obtained;The edge point of coarse positioning edge position is interpolated using subpixel edge detection algorithm based on cubic spline interpolation, and the subpixel edge profile of blade is obtained;Least square method is used to curve fitting to subpixel edge profile, and the blade wall thickness size of blade part to be measured is measured based on fitting result.The application combines pixel level edge detection algorithm with subpixel edge detection algorithm based on cubic spline interpolation to process CT image, and the edge pixel point is promoted from pixel level to subpixel level, which not only guarantees the stability of measurement result, but also effectively realizes high-precision measurement of turbine blade size.

This invention relates to the field of pharmaceutical automation equipment and discloses an intelligent sampling robot suitable for drug production. The robot includes a multi-sensor fusion positioning system, a force control coordination system, and a cleanroom structure design. The multi-sensor fusion positioning system comprises a 3D laser positioning module, a binocular vision module, a sub-pixel edge detection module, and a sensor fusion algorithm. The force control coordination system includes a hybrid RNN-LSTM (Recurrent Short-Term Memory) and CNN (Convolutional Neural Network) network, an airbag gripper, a six-dimensional force sensor, and an underactuated rotation mechanism. The cleanroom structure design includes a mechanical gripper, a nano-sterile coating, and a stainless steel IP69K sealing structure. By employing a fusion algorithm combining extended Kalman filtering and fuzzy evidence theory, efficient fusion of multi-sensor data is achieved. Dynamic threshold adjustment is realized through the hybrid RNN-LSTM and CNN network, reducing force control fluctuations and lowering production costs.

The invention discloses a transverse image distance measuring device and method for transformer replacement traction, and belongs to the technical field of power equipment maintenance. The device comprises a transverse visual image deviation measuring system, a mounting frame, a quick clamping device and an image processing host, the visual deviation measuring system is arranged above a main transformer transfer trolley track wheel carrier through the mounting frame and the quick clamping device, and the visual angle of the visual deviation measuring system is adjusted to be perpendicular to a track; the system collects images of track wheels and tracks; the method comprises the following steps of: based on an image, extracting a track and a wheel rim edge through a sub-pixel edge detection algorithm which comprises image preprocessing and is based on a Zernike moment, and calculating a transverse deviation amount; according to the method, traditional manual plumb line measurement is replaced with non-contact image measurement, the measurement precision is greatly improved, uninterrupted continuous monitoring is achieved, the rail gnawing risk is effectively eradicated, and the operation safety and universality are remarkably improved.

The invention discloses a method and a device for measuring the motion idle stroke and the overall flexibility of a flapping-wing aircraft mechanism, and relates to the field of miniature aircrafts, and the method comprises the steps: loading an aircraft wing rod on a high-speed camera measurement platform, and recording an image of the wing rod in a motion period; after the recorded image is optimized and denoised, an optical flow method is used for capturing a moving wing rod, a sub-pixel edge detection method is used for recognizing a gray level image of wing rod movement, then the edge is optimized and corrected based on the geometrical characteristics of the wing rod, and edge calibration is carried out on the gray level image of wing rod movement; then, the angular displacement of the wing rod is recognized according to the wing rod motion gray level image after coordinate calibration is completed, meanwhile, the distribution load of the wing rod is reconstructed, and inversion is conducted on the bending moment of the wing rod through recognized coordinate information and a Tikhonov regularization method; and finally, drawing an angular displacement-bending moment curve graph of the wing rod and extracting the idle stroke and the overall flexibility of the aircraft. According to the method, the motion idle stroke and the overall flexibility of the mechanism on the flapping-wing air vehicle are effectively extracted with high precision, and the method has great guiding significance in design, test and function research of the flapping-wing air vehicle.

The application discloses a kind of based on edge feature direction code matching's hydraulic hoist tower structure deformation measurement method, belong to computer vision measurement field, this method includes the following steps: using subpixel edge detection method to the detection area image is handled, obtain subpixel edge line position and subpixel edge direction;Based on subpixel edge direction, using direction code encoding method to the edge direction angle is handled, obtain the edge direction code of discretization, and based on the edge direction code of discretization the edge direction code of left and right camera image is calculated;Based on binocular stereo vision system, using template matching method and parallax principle to the edge direction code of left and right camera image is matched, calculate the spatial three-dimensional coordinates of detection area matching coefficient maximum point;Based on the spatial three-dimensional coordinates change of same detection point before and after structure deformation, obtain the deformation of hydraulic hoist tower structure.

This invention relates to the field of printing machinery technology, and particularly to a high-precision positioning method for screen printing based on machine vision, comprising: Step 1: Constructing a collaborative calibration and marking system; Step 2: Dynamic acquisition of deformation data: Within a set time window after the squeegee leaves the screen, images of the first type of marker points and the second type of target are acquired simultaneously; the center of the marker is located using a sub-pixel edge detection algorithm, and the difference between the actual spacing and the nominal spacing is calculated; Step 3: Generation of thermo-mechanical coupling compensation parameters; Step 4: Multi-degree-of-freedom collaborative positioning: Motion control commands for the substrate support platform and the screen tensioning mechanism are generated based on the translation compensation amount and rotation compensation angle; Positioning adjustment is completed and the marker overlap is verified before the start of the next printing cycle; Step 5: Iterative optimization of closed-loop error. This method achieves efficient perception, accurate modeling, and real-time compensation of multi-source errors such as thermal deformation, force-induced deformation, environmental disturbances, and material properties during the screen printing process.

The invention discloses a hydraulic lifting tower structure deformation measurement method based on edge feature direction code matching, and belongs to the field of computer vision measurement, and the method comprises the following steps: employing a sub-pixel edge detection method to process a detection region image, and obtaining a sub-pixel edge line position and a sub-pixel edge direction; processing the edge direction angle by adopting a direction code coding method based on the sub-pixel edge direction to obtain a discretized edge direction code, and calculating the edge direction codes of the left and right camera images based on the discretized edge direction code; based on a binocular stereoscopic vision system, matching edge direction codes of left and right camera images by adopting a template matching method and a parallax principle, and calculating a space three-dimensional coordinate of a maximum value point of a matching coefficient in a detection area; and obtaining the deformation amount of the hydraulic lifting tower structure based on the spatial three-dimensional coordinate change of the same detection point before and after the structure deformation.

The present application relates to the vertical shaft cage detection technical field, specifically, it relates to a kind of industrial intelligent vision detection and diagnosis system for vertical shaft cage, acquisition unit synchronously obtains cage flange surface image and cage car pitch angle, coal dust shadow quantization unit uses bimodal adaptive threshold segmentation combined with region growing algorithm to extract coal dust area, introduce space weight factor to calculate average gray value and coverage area proportion, dynamic coupling calibration unit relies on three-dimensional look-up table and nonlinear interpolation of multi-working condition calibration, match the optimal deviation compensation coefficient of the combination of jitter and coal dust, generate dynamic gray scale segmentation threshold, defect diagnosis decision unit is through zoned adaptive segmentation, multiscale morphological filtering denoising, combined with gradient amplitude and curvature double-constraint subpixel edge detection accurately calculate wear depth, according to real-time depth and historical trend output grading control instruction, eliminate coupling interference, improve cage wear detection accuracy, provide reliable basis for safe operation.

This invention discloses a method, apparatus, and storage medium for sub-pixel edge detection of battery cell images. The method includes: acquiring a preprocessed battery cell image; edge localization processing based on the Canny operator to obtain pixel-level edge point images; obtaining an optimal threshold using a maximum entropy multi-threshold segmentation algorithm based on the Firefly algorithm; calculating Zernike parameters for the pixel-level edge points using a Zernike moment sub-pixel edge detection algorithm; separating contour edge points, fine grid edge points, and main grid edge points based on the Zernike parameters and the optimal threshold; and performing least-squares fitting processing on these points to obtain the contour line, fine grid edge line, and main grid edge line of the battery cell. This invention, through the Zernike moment sub-pixel edge detection algorithm, reduces the edge detection accuracy to within one pixel and minimizes the impact of noise on detection accuracy.

The application relates to a multi-camera large-size visual measurement method and system, which comprises the following steps: installing a plurality of cameras for large-size measurement; marking a group of three-coordinate marker points in the visual field of each camera on a calibration whiteboard by using a three-coordinate measuring machine, and recording the three-coordinate positions and sequence of each three-coordinate marker point; acquiring images of the three-coordinate marker points in the visual field of each camera on the calibration whiteboard by the camera, and obtaining the center positions of the regions where the three-coordinate marker points are located; obtaining the pose transformation matrix of all the cameras; adopting a sub-pixel edge detection algorithm based on Gaussian fitting on the images collected by the camera to obtain an edge point set, and fitting an edge straight line by using the edge point set; obtaining a straight line intersection point based on the edge straight line; converting the straight line intersection point to a world coordinate system based on the obtained pose transformation matrix; and obtaining a size based on the converted position. The application is used for high-precision large-size visual measurement.

The application discloses a target positioning method based on Zernike moments and geometric constraints, which comprises the following steps: collecting images, and performing interpolation after cutting out the area where the target is located; adopting an improved Zernike moment sub-pixel edge detection algorithm, and utilizing the geometric relationship of the target pattern to adaptively adjust the background gray threshold value in the Zernike moment, so as to realize edge extraction of the target object; and utilizing the edge coordinates of the target pattern to perform target positioning. The application can solve the problems of edge positioning deviation and pseudo edge of the traditional Zernike moment sub-pixel edge detection method, can adaptively adjust the edge parameter threshold value of the Zernike moment sub-pixel detection, has better robustness, and improves the accuracy of edge extraction.

The invention discloses a bridge expansion joint disease monitoring method and system based on time sequence image analysis, and belongs to the technical field of bridge structure health monitoring, and the method comprises the steps: installing fixed industrial cameras at the two sides of an expansion joint, regularly collecting high-resolution images, and synchronously obtaining temperature data; accurate registration of images in different periods is realized through feature point matching; identifying diseases such as rubber strip aging, profile steel warping, foreign matter blockage and concrete damage by adopting a deep convolutional neural network; a sub-pixel edge detection algorithm is utilized to measure the seam width, and a seam width-temperature response curve is established to identify abnormal deformation; according to the method, automatic detection, high-precision measurement and trend early warning of expansion joint diseases are realized, and the method is suitable for remote intelligent supervision of expressway bridge groups.

The application discloses an oil saw guide plate flatness and groove wear image measurement method and system, relates to the technical field of machine vision image measurement, and the method obtains guide plate multi-source fusion image data through the cooperative collection of a line laser projection and coaxial light source illumination, calculates the flatness deviation by using three-dimensional point cloud reconstruction and reference plane fitting, adopts sub-pixel edge detection and multi-section statistical measurement to quantize groove wear parameters, fuses the flatness and groove wear indexes to calculate a comprehensive wear index and output a grading maintenance suggestion, and automatically generates a detection report, thereby providing an objective quantitative basis for oil saw guide plate quality detection.

The application discloses a fish body comprehensive detection method and system, computer equipment and a storage medium. The method comprises the following steps: acquiring a main view image and a top view image of a fish body through different-view-angle depth cameras; adopting a trained target detection model to perform target detection on the main view image and the top view image, and determining initial position information and species information of the fish body; performing sub-pixel edge detection on the initial position information of the fish body to obtain edge position information of the fish body; obtaining coordinate information of the fish body edge in a corresponding camera coordinate system according to the edge position information of the fish body and in combination with depth information of the depth camera, and obtaining fish body size information through calculation of Euclidean distance; and predicting the fish body weight according to the fish body size information and the fish body species information, so as to obtain a fish body growth state. The application improves the accuracy of fish body growth state detection, and can timely find abnormal conditions of fish body growth.

The invention discloses a foaming rate detection method and device, electronic equipment and a storage medium, and relates to the technical field of image processing, and the method comprises the steps: obtaining a product image containing a foaming region in a to-be-detected product, carrying out the sub-pixel edge detection, and obtaining a sub-pixel edge point sequence, the product image is an image acquired after the foaming area of the to-be-detected product is sliced under the ultraviolet rays with the preset wavelength; determining a first positioning contour area containing at least two sub-pixel edge points in the product image according to the sub-pixel edge point sequence; determining a candidate image area in the product image according to a preset pixel dynamic threshold value, and determining a second positioning contour area with bubbles according to the first positioning contour area and the candidate image area; and determining a first image region representing the bubbles in the second positioning contour region, determining an optimal circumcircle corresponding to the first image region, and determining the foaming rate of the bubbles in the foaming region according to the optimal circumcircle. The foaming rate detection efficiency is improved.

This invention discloses an intelligent positioning method and system for can stamping, relating to the field of image processing technology. It includes acquiring images of the stamped can parts; using an adaptive threshold segmentation algorithm to segment the stamped can parts from the background to obtain segmented can region image data; accurately locating the can contour edge coordinates using a moment-based subpixel edge detection method to obtain key dimensional parameters of the can; extracting texture features of the can surface using gray-level co-occurrence matrix and local binary mode algorithms; and determining whether a surface defect exists using a support vector machine classification model. This invention solves the problem of traditional image processing methods struggling to accurately extract edge information when faced with reflective surfaces and complex backgrounds. By establishing a can coordinate system and performing posture correction, it ensures the accuracy of measurement results and overcomes the tendency for cans to shift or tilt during production, achieving efficient and accurate quality inspection of stamped can parts.

The invention discloses a method for detecting geometric defects of an airplane riveting upset head. The method comprises the following steps of: 1, constructing a riveting upset head defect image acquisition system platform; 2, performing smooth denoising on the original grayscale image by adopting a two-dimensional Gaussian function; 3, calculating the gradient magnitude and the gradient direction of the picture; 4, selecting a to-be-processed pixel point as a center, and assigning the gradient of the picture; 5, carrying out defect edge coarse extraction based on a Canny operator to obtain a unit circle image function; 6, establishing an edge model cumulative distribution function based on improved Zernike moment sub-pixel edge detection; 7, replacing the step model with the slope edge model; 8, converting the Zernike moment definition equation into a rectangular coordinate form; 9, taking the pixel-level edge positioning point as a coordinate origin to obtain a final sub-pixel edge coordinate in the actual image; according to the method, the problems that missing detection and false detection are easily caused by defect detection in actual production operation of airplanes, and the requirement of detection automation cannot be met are solved.

The application discloses a kind of fusion improved YOLO and subpixel extraction's slope deformation visual detection method, belong to image data processing technical field, including constructing slope dataset;Improved YOLO model is constructed;Improved YOLO network is trained with slope dataset, and improved YOLO model is obtained;In real monitoring point, image in video is carried out key point detection with improved YOLO model, and key point prediction pixel level coordinates are output;Subpixel edge detection method of Zernike matrix is used to generate the subpixel coordinates of key point, and cumulative displacement monitoring is carried out based on subpixel coordinates.The application keeps the advantages of YOLOv8 algorithm deployment efficiency and model light weight, significantly improves the precision of highway slope displacement monitoring, breaks through the pixel level limit and pursues the displacement perception ability of submillimeter level, easy to deploy intelligent highway slope displacement real-time monitoring, effectively prevent disasters.

This invention discloses a high-precision online visual inspection system and method for LED carrier tape based on a dual-station setup. The inspection system in this invention features an adjustable dual-station configuration to meet the requirements for inspecting the planar appearance and thickness dimensions of the LED carrier tape. The structural design fully considers compatibility, inspection speed, and the maximum permissible operating speed of the carrier tape. Furthermore, addressing the challenges of miniaturized carrier tapes and high precision requirements, a least-squares sub-pixel edge detection algorithm is proposed. This algorithm can effectively detect various feature dimensional parameters on the LED carrier tape, achieving high-speed, high-precision positioning and recognition of feature points on the carrier tape image. To address the issue of defocus blurring when the carrier tape moves beyond the lens's depth of field, a linear compensation algorithm is proposed. This algorithm provides real-time feedback of inspection data, quickly guiding the camera and enabling rapid on-site debugging in industrial settings, ensuring the system can be truly applied in industrial production environments.

The invention discloses a sub-pixel positioning detection method and system based on a DIC algorithm, and the method comprises the steps: obtaining a plurality of speckle images of a to-be-detected component, carrying out the whole-pixel-level positioning of the speckle images through a three-step search method according to the feature parameters of speckles, and obtaining a reference image; a bilinear interpolation algorithm is adopted to carry out sub-pixel-level positioning on a reference image to obtain a first interpolation image, a bicubic interpolation algorithm is adopted to carry out sub-pixel edge detection on the reference image to obtain a second interpolation image, and fusion image analysis is carried out based on the first interpolation image and the second interpolation image to obtain a target image detection result. A three-step search and interpolation iteration operation algorithm is introduced, the calculation amount can be greatly reduced under the condition that the calculation precision is kept unchanged or even higher, so that the operation time is greatly shortened, meanwhile, the hardware overhead is remarkably reduced, and the sub-pixel positioning detection accuracy is improved.

The application provides a camera calibration method and device, which comprises the following steps: collecting defocus images of a ring calibration board at different angles, and performing sharpening processing on the defocus images at different angles to obtain sharpened defocus images; performing edge detection on the sharpened defocus images based on a sub-pixel edge detection algorithm to obtain an edge detection image; performing edge abnormal point elimination operation on the edge detection image to obtain a target defocus image, so that the ring edge data is more accurate; determining a point array corresponding to the projection center of a plurality of rings on the ring calibration board on the target defocus image; performing normalization processing on the point array to obtain a point matrix of a normal focus image corresponding to the target defocus image. Finally, the camera is calibrated based on the point matrix of the normal focus image, and the problem that the feature point coordinates cannot be accurately extracted and the error is large in the camera calibration process in the ultra-large result and long-distance computer vision measurement process of the existing calibration method is solved.

The invention discloses a slope deformation visual detection method fusing improved YOLO and sub-pixel extraction, and belongs to the technical field of image data processing, and the method comprises the steps: constructing a slope data set; an improved YOLO model is constructed; training the improved YOLO network by using the slope data set to obtain an improved YOLO model; carrying out key point detection on an image in a video at a real monitoring point by using an improved YOLO model, and outputting a key point prediction pixel-level coordinate; and a Zernike moment sub-pixel edge detection method is used to generate sub-pixel coordinates of the key points, and accumulated displacement monitoring is carried out based on the sub-pixel coordinates. On the basis of keeping the advantages of deployment high efficiency and model lightweight of the YOLOv8 algorithm, the precision of road slope displacement monitoring is remarkably improved, the pixel-level limitation is broken through, the submillimeter-level displacement sensing capacity is pursued, intelligent road slope displacement real-time monitoring of actual deployment is facilitated, and disasters are effectively prevented.

The application discloses a fruit and vegetable image sub-pixel edge detection method based on Gaussian modeling. In view of the situation that the left and right sides of the approximate Gaussian curve are not equal in the conventional sub-pixel edge detection, the introduction of a cubic fitting factor helps to change the original Gaussian modeling curve symmetry structure and adjust the height range of the left and right wings to make it closer to the actual data curve characteristics. By constructing a fruit and vegetable image sub-pixel edge detection error function, the Gaussian curve fitting coefficient optimization value, the Gaussian curve fitting median optimization value, the Gaussian curve fitting standard deviation optimization value and the cubic fitting factor optimization value are determined. The gradient amplitude of the pixel point can give the corresponding fruit and vegetable image sub-pixel edge detection Gaussian curve fitting value to judge whether it is a sub-pixel edge point, so as to complete the fruit and vegetable image sub-pixel edge detection.

The application discloses a kind of unmanned aerial vehicle hyperspectral push-broom imaging geometric correction methods, comprising the following steps: step 1, according to POS data, DEM data, using collinear condition equation obtains orthophoto, using Canny / Devernay subpixel edge detector, extract the edge point of corrected orthophoto;Step 2, using BM3D algorithm and median filter smooth orthophoto obtained in step 1, the image that will eliminate sawtooth distortion is used as reference image, using Canny / Devernay subpixel edge detector, extract the edge point of this image;Step 3, to the orthophoto obtained in step 1, select the area needing further correction, using the edge point extracted in step 1, 2 calculates the roll angle correction number, and corrects roll angle error;Step 4, the roll angle in POS data is replaced by the roll angle corrected in step 3, repeat step 1, and obtain the orthophoto that eliminates the distortion of roll angle error.The application can effectively correct the distortion of unmanned aerial vehicle line scanning hyperspectral image.

The invention discloses a sub-pixel edge detection method and device and a storage medium in the technical field of computer vision and image processing, and the method comprises the steps: carrying out the weighted total least square straight line fitting based on a joint weight, and obtaining a local main direction straight line; calculating an orthogonal residual error of the candidate sample based on the local main direction straight line, calculating a Huber type robust weight according to the size of the orthogonal residual error, and carrying out primary reweighting and refitting based on the Huber type robust weight and a joint weight to obtain a stable main direction straight line; and carrying out linear interpolation type smooth updating based on the current position and the target position of the sub-pixel point, carrying out chaining according to direction continuity and geometric adjacency, and outputting a sub-pixel edge curve set. According to the invention, the technical problems of positioning jitter, wrong connection / disconnection and outlier traction in a scene with complex texture and low signal-to-noise ratio in the existing sub-pixel edge detection technology can be solved.

The application discloses a kind of based on machine vision's rod piece bending stiffness distribution measurement system, it is related to material mechanics parameter measurement technical field, including: on camera measurement platform, rod piece is loaded, and the image before and after loading is collected;The image collected is cropped and gray image conversion operation is carried out, and according to noise level and deflection interval carries out image availability evaluation;The discrete edge point set is obtained by applying improved subpixel edge detection technology, and the edge point pair is screened out, pixel coordinates are converted into actual coordinates, the edge coordinate difference value before and after loading is calculated, and then deflection distribution is calculated;Using Tikhonov regularization, generalized cross-validation method is used to calculate the second derivative of discrete deflection data, and the bending moment distribution function formula is established based on cantilever beam model;Finally, combined with Euler-Bernoulli beam differential equation, space stiffness inversion is carried out.The application effectively and accurately obtains the stiffness field distribution of rod piece, and provides a new technical path for the research and engineering application of various variable stiffness structures.

This invention relates to a high-precision weld joint inspection method and system, comprising: acquiring photographs of a circular plate-like part to be inspected; determining the center and diameter of the circular plate-like part; performing image preprocessing and coarse positioning on the photographs to obtain candidate baselines and candidate circles; filtering the candidate baselines and candidate circles to obtain measurement baselines and measurement circles; constructing baseline measuring calipers and circular measuring calipers; employing a sub-pixel edge detection algorithm to extract sub-pixel edge points; fitting straight lines and ellipses and calculating distances to achieve weld joint defect detection. This invention automatically filters and measures the inspection results, eliminating manual intervention and achieving high-precision automatic weld joint measurement.