133 results about "Dimension measurement" patented technology

The invention relates to the technical field of large-size part three-dimensional measurement, and discloses a large-size part three-dimensional size measurement method and device based on machine vision, and the method comprises the steps: obtaining a material reflection characteristic reference data set and original point cloud data; according to the reference data set, laser power and gain are adjusted in a self-adaptive mode, and optimized scanning parameters are obtained; and performing denoising, feature extraction, region segmentation and plane fitting according to the optimized parameters and the original point cloud to obtain a high-precision geometric dimensioning result. According to the invention, high-precision, high-stability and high-efficiency three-dimensional size measurement can be realized on a large-size part made of a complex material and having a curved surface, and the three-dimensional size measurement method is obviously superior to a traditional scheme.

The invention relates to a 3D size measurement method suitable for a curved surface structure. Capturing a target curved surface by using a camera and a laser scanner; using structured light to generate point cloud data; performing point cloud registration among the plurality of views by means of a SIFT feature matching algorithm to generate a unified point cloud model; using a deep learning algorithm to train the feature recognition model, and extracting key geometric features of the curved surface; identifying curved surface features with different edges, angles and curvatures by marking and classifying, and converting the features into mathematical representation by using a Bezier curve parameterized modeling method; establishing a comprehensive error model, evaluating a plurality of error sources, and fitting an error propagation function through experimental data; adjusting dimension measurement by using a least square method; a real-time data acquisition and feedback system is introduced, environment change is monitored by using a temperature and humidity sensor, and scanning parameters including scanning speed and light source brightness are adjusted through a PID controller.

The invention provides a three-dimensional point cloud-based geometric shape and position dimension measurement method and application thereof. The method utilizes a three-dimensional scanning technology to obtain three-dimensional point cloud data of an industrial part, and processes and measures the three-dimensional point cloud data through the following steps: 1, preprocessing: removing isolated points, outliers and Gaussian noise in the point cloud through filtering; 2, geometric feature extraction: extracting geometric features with linear and arc features, and dividing the geometric features into single-cluster point clouds; 3, straightness and roundness measurement: fitting the point clouds with geometric characteristics into a straight line or a circle so as to measure straightness and roundness; and 4, arc length measurement: providing a method for sequentially searching adjacent points on the linear point cloud, calculating the sum of the distances between the adjacent points, and further measuring the arc length. The application field of the invention comprises the measurement and the quality control of the part size in the manufacturing industry. The method performs non-contact measurement based on the three-dimensional point cloud data, and has the characteristics of high efficiency, high precision and strong anti-interference performance.

A water conservancy pipeline measuring device belongs to the technical field of pipeline measurement and comprises a pipeline and further comprises a bottom plate, a supporting unit is arranged on the bottom plate, a driving unit, a graduated scale, a measuring unit and an inner supporting unit are arranged on the supporting unit, the measuring unit is used for measuring the inner diameter, the outer diameter and the thickness of the pipeline, and the inner supporting unit is used for inner supporting positioning of the pipeline. The driving unit drives the measuring unit and the inner supporting unit to play a role at the same time. According to the invention, the same measuring device is adopted, and a single measuring step is utilized, so that the detection of three linear dimensions of the inner diameter, the outer diameter and the thickness of the pipeline can be simultaneously met, and compared with the traditional equipment which can only meet the measurement of the inner diameter of the pipeline at a single time, the comprehensive requirement on the measurement of the pipeline dimension during actual measurement can be more efficiently and comprehensively met; and the whole measurement process is carried out based on a stable and uniform reference point, so that errors caused by inconsistent reference points are fundamentally eliminated.

The invention relates to the technical field of size detection, and provides a size detection method, system and device and a medium, and the method comprises the steps: obtaining a shadow image of a to-be-detected workpiece, carrying out the gray conversion or binarization processing, and smoothing the image through a Gaussian kernel filter, so as to reduce the noise and enhance the edge information; performing edge detection by using an improved Canny operator to extract object contour pixel points, calculating by using an interpolation algorithm to obtain a higher-precision object contour image, gradually traversing the contour image according to a preset track and a reference template by means of a sliding window algorithm, and calculating similarity to select a target local area; and finally, finding the highest point and the lowest point of the object contour image in the target local area, and integrating the data of each target local area according to the height difference, thereby accurately obtaining the overall size of the workpiece to be measured, and improving the accuracy and convenience of size measurement.

The invention belongs to the technical field of industrial measurement, and particularly discloses a multi-frame three-dimensional point cloud splicing measurement method and device for high-temperature environment profile steel production and a medium. The method disclosed by the invention comprises the following steps: firstly, acquiring three-dimensional point cloud data of the profile steel surface through a line laser scanner; then, denoising and normalization preprocessing operation is carried out on the three-dimensional point cloud data; thirdly, splicing the three-dimensional point cloud data by using an improved ICP (Inductively Coupled Plasma) algorithm, and carrying out Laplace smoothing and normal vector homogenization processing on the spliced three-dimensional point cloud data; thirdly, performing profile steel edge fitting on the spliced data; and finally, calculating the geometric dimension of the profile steel after edge fitting. According to the invention, the precision of point cloud splicing and the stability of a measurement result are greatly improved. The method can be widely applied to dimension measurement of the profile steel in the high-temperature environment.

The invention relates to a size measurement method and device, computer equipment and a computer readable storage medium. The method comprises the following steps: acquiring a 2.5 D depth image of the surface of an object to be measured, and establishing a two-dimensional reference coordinate system in the 2.5 D depth image; wherein the 2.5 D depth image refers to a two-dimensional image comprising depth information; under the two-dimensional reference coordinate system, determining a target position and a coverage area of the virtual probe in the 2.5 D depth image; extracting depth information from pixel points in the coverage area in the 2.5 D depth image through a virtual probe, and determining a three-dimensional point location according to the depth information and the target position; constructing a three-dimensional reference coordinate system based on the three-dimensional point location and the two-dimensional reference coordinate system; and based on the three-dimensional reference coordinate system, carrying out size measurement on the to-be-measured object to obtain a size measurement result. According to the invention, the accuracy of dimension measurement can be improved.

The invention relates to the technical field of dimension measurement, in particular to a dimension error measuring method and measuring equipment for an aviation transmission gear. The method comprises the following steps: according to position distribution of laser points corresponding to each gear point and each gear point in a neighborhood range under each line laser scanning, obtaining relative coordinates of each gear point and each gear point in the neighborhood range; according to single-point stability indexes of each gear point under each line laser scanning and a laser point corresponding to each gear point in a neighborhood range, and a scanning normal factor of the scanning contour, obtaining relative coordinate confidence of each gear point and each gear point in the neighborhood range; according to the coordinate and the coordinate accuracy of the laser point corresponding to each gear point under different line laser scanning, obtaining the correction coordinate of each gear point; and obtaining a three-dimensional model of the gear, and measuring the size error of the gear. According to the method, the accurate position coordinate of each gear point is obtained, the gear three-dimensional model is constructed, and the accuracy of gear size error measurement is improved.

The invention relates to the technical field of quality inspection, and particularly discloses an electronic grating quality inspection method and system based on digital twinning, and a medium, and the method comprises the steps: carrying out the three-dimensional modeling of an actual part in a standard form, and obtaining a digital twinning model of the actual part; carrying out quality inspection zoning on the surface area of the actual part based on the digital twinborn model of the actual part to obtain all appearance quality inspection areas of the actual part; detecting each appearance quality inspection area of the actual part by using a digital twin electronic grating group to obtain shape and size measurement data and surface defect detection data of each appearance quality inspection area of the actual part; based on the shape and size measurement data and the surface defect detection data of all the quality inspection areas of the actual part and the digital twinborn model, obtaining a quality inspection result of the actual part; accurate partition detection of a quality inspection object is realized, and visual visualization of a quality inspection result is realized by using digital twinning.

The present invention belongs to the field of dimension measurement technology, and specifically relates to a method, system, device, and medium for evaluating the uncertainty of a large-scale multilateral coordinate measurement system. The method inputs the acquired target point coordinates into an error transfer model to obtain three coordinate uncertainty components corresponding to the coordinate values. This uncertainty coefficient is then calculated based on the uncertainty introduced by the offset of the reflector's optical center, and the uncertainty evaluation is performed. The present invention, based on the fundamental principles of the multilateral coordinate measurement system, simplifies the system coordinate system to reduce parameters, thereby reducing the amount of calculations. The method also provides a specific mathematical formula, which facilitates rapid evaluation at the measurement site and is easy for metrologists to learn and apply.

The invention discloses a size measurement method, device and equipment and a storage medium, and relates to the technical field of industrial measurement, and the method comprises the steps: determining the coordinates of a to-be-measured point corresponding to current image data according to a target visual conversion model; when the special point locations exist in the point locations to be measured, the special point locations in the point locations to be measured are preprocessed, and the point locations to be measured are updated according to a processing result; and measuring the size of the to-be-measured product according to the updated coordinates of the to-be-measured point. Through the above mode, after the optical measurement equipment collects the current image data of the to-be-measured product, the coordinates of the to-be-measured point locations are determined based on the target artificial intelligence service equipment according to the target visual conversion model, whether special point locations exist in the to-be-measured point locations is judged, if yes, the size of the to-be-measured product is measured based on the geometric measurement strategy, and the measurement accuracy is improved. Therefore, the efficiency and precision of measuring the size of the product can be effectively improved, the reliability of a measurement result is ensured, and powerful support is provided for quality control and decision making in the production process.

The invention discloses a groove detection method, device and equipment based on laser line scanning and a medium, and the method comprises the steps: scanning a to-be-detected target to obtain a target image, and carrying out the light strip center extraction: obtaining the three-dimensional point cloud data of the to-be-detected target; classifying the three-dimensional point cloud data to obtain three-dimensional point cloud data of the upper surface and the lower surface of the groove of the target to be detected, and obtaining edge three-dimensional point cloud data of the left side and the right side of the upper surface of the groove based on an RANSAC algorithm; according to the three-dimensional point cloud data of the upper and lower surfaces of the groove of the target to be detected and the edge three-dimensional point cloud data of the left and right sides of the upper surface of the groove, plane and curve fitting is carried out to obtain a curve model; and determining the depth of the groove of the to-be-detected target according to the distance of the fitting surface in the curve model, and determining the width of the groove according to the fitting edge curve in the curve model. The invention belongs to the field of object size measurement. According to the invention, accurate measurement of the size of a groove with a large depth-to-width ratio is realized.

This invention discloses a multi-vision method for measuring the dimensions of small workpieces based on a binocular vision system, belonging to the field of workpiece dimension measurement technology. Addressing the difficulty in achieving accurate three-dimensional dimension measurement using existing methods, the following solution is proposed, comprising the following steps: S1: Chessboard corner point extraction; S2: Calibration plate removal; S3: Plane fitting; S4: Vertex extraction; S5: Stereo matching algorithm; S6: Dimension calculation. The average absolute error of this invention at different angles is 0.33 mm, the total relative error is 0.90%, and the variance is less than 0.01 mm. 2 This enables relatively accurate measurement of the three-dimensional dimensions of small workpieces from multiple perspectives.

The invention relates to the technical field of size measurement, in particular to a high-precision measurement method for the size of an ABS plate mold, and the method comprises the steps: scanning the surface of the ABS plate mold twice, respectively obtaining all point cloud data and all sparse point cloud data, and respectively constructing a three-dimensional mold model and a three-dimensional sparse model, performing spatial calibration on the three-dimensional mold model, and dividing the three-dimensional mold model into a plurality of component models; and calculating the space deviation value, the reflection deviation value, the adjustment coefficient and the adjusted filtering radius of each part model, filtering the point cloud data on all the part models by combining a filtering algorithm to obtain a reconstructed three-dimensional mold model, and measuring the size of the ABS plate mold. By dynamically adjusting the filtering radius of the filtering algorithm, the deviation influence caused by the reflectivity difference of different materials in the ABS plate mold is effectively reduced, and the precision and accuracy of size measurement of the plate mold are improved.

The invention discloses a standard part size measurement error compensation method, device and equipment and a medium, and belongs to the technical field of size measurement, and the method comprises the steps: obtaining an initial value of single-pixel precision; obtaining a plurality of first shot images, determining a compensation value of the single pixel precision according to the measurement size value in each first shot image, and adjusting the single pixel precision according to the compensation value of the single pixel precision; and obtaining a plurality of second shot images again, and determining an error compensation value of the dimension measurement of the standard part according to the measurement dimension value in each second shot image. According to the method, the compensation value of the single-pixel precision is obtained, the single-pixel precision is corrected, the accuracy of the single-pixel precision is improved, the error compensation value of each measurement point position is calculated on the basis of the corrected single-pixel precision, the measurement error in the size measurement process of the standard part can be effectively reduced, and the measurement accuracy of the standard part is improved. And the measurement precision and the repeatability precision are obviously improved, so that the use requirements of users are effectively met.

The present invention discloses an automatic measuring device and a measuring method for the size of a bladder skin, which relates to the field of measuring length, thickness or similar linear dimensions. The automatic measuring device mainly includes a turntable, a jig, a thickness measuring mechanism, a height measuring mechanism and a diameter measuring mechanism. The jig is used to open the bladder skin into a regular truncated cone shape, and the upper and lower ends of the bladder skin are exposed, so that each measuring mechanism can measure the upper and lower ends of the bladder skin at the same time, which is efficient and can avoid measurement errors caused by loading and unloading the bladder skin back and forth. In addition, the two cameras of the thickness measuring mechanism are rotatably arranged at the upper and lower parts of the jig through an electric rotating table, and the upper and lower ends of the bladder skin are photographed at multiple points through the rotation of the two cameras, and multiple thickness values ​​of the upper and lower ends of the bladder skin are calculated, which has the advantages of high automation, accurate measurement, and complete size measurement functions.

1. Name of the Design Product: Measuring Industrial Camera (4K). 2. Use of the Design Product: This design product is used for geometric dimension measurement and image processing functions of products such as electronics and hardware. 3. Design Key Points of the Design Product: Lies in the shape. 4. Picture or Photo that Best Illustrates the Design Key Points: Stereogram.

The utility model discloses the technical field of machining measurement device, more specifically discloses a kind of for the size measurement tool of incomplete circle, comprising: tool main body, detachably set on part;Compensation component, set on tool main body, can be synchronous with the arc to be processed Machining;Wherein, the straight line of the center of the arc to be processed of compensation component and arc to be processed can pass through arc to be processed;Measuring component is used to measure the diameter between compensation component and arc to be processed;By using the utility model, arc can be measured in real time during processing, cancel the use of radius gauge and three-dimensional coordinate instrument;Greatly reduce the difficulty of real-time measurement arc actual size in part processing process, improve the arc size measurement stability and accuracy, can effectively improve the product quality and stability of part.

The invention relates to a high-precision industrial CT (Computed Tomography) size measurement method used under a diffuse metal artifact working condition, and belongs to the field of nondestructive testing and image processing. According to the method, a three-dimensional CT image of a detected workpiece is obtained, after slicing processing is carried out, the Poisson distribution noise reduction technology is adopted to reduce image noise, and a double-threshold method is adopted to remove highlight metal artifacts. Then, through binarization, corrosion expansion and opening and closing operation processing, a primary rough edge is extracted, and fine correction is carried out; and the adaptability of the model is enhanced by using a data enhancement technology. Through training of a high-precision conditional adversarial generative network, an image with fine edge information is obtained. And finally, key parameters such as straightness, inner diameter, outer diameter, convex curvature radius, concave curvature radius, tube wall thickness and thickness standard deviation of the tubular material are calculated and output. According to the method, the precision and reliability of industrial CT size measurement can be remarkably improved under the condition of diffuse metal artifacts.

The present application discloses a product size measurement method, device, equipment and medium, which relates to the field of three-dimensional measurement technology. The method includes: photographing the product to be measured by a preset top camera and a preset bottom camera to obtain the upper surface and the lower surface of the product to be measured, and determining the inclination angle of the upper surface and the inclination angle of the lower surface of the product to be measured based on the upper surface and the lower surface of the product to be measured; determining the inclination angle of the product to be measured based on the inclination angle of the upper surface and the inclination angle of the lower surface of the product to be measured and the inclination angle of the upper surface and the lower surface of the calibration block of a preset calibration block; rotating and adjusting the upper surface and the lower surface of the product to be measured according to the inclination angle of the product to be measured to obtain the actual upper surface and the actual lower surface of the product to be measured; and determining the size of the product to be measured based on the actual upper surface and the actual lower surface of the product to be measured.

The invention belongs to the technical field of testing and measuring, and particularly relates to a fastener size measuring method and system based on a structured contour line. The method comprises the following steps: placing a calibration block on a detection platform for image acquisition, and taking an upper edge line of the calibration block as a reference line; the calibration block is taken down, and the fastener is placed on a detection platform for image acquisition; extracting a plurality of feature points from the outer contour of the fastener image, calculating a symmetric line for representing the symmetry axis of the fastener, and correcting the outer contour line of the image based on the symmetric line; according to the corrected outer contour line, a cylindrical surface outer contour straight line and a conical surface outer contour straight line of the fastener are determined, and two intersection points of the cylindrical surface outer contour straight line and the conical surface outer contour straight line on the left side and the right side of the fastener are calculated respectively; determining the distance from the midpoint of the connecting line of the two intersection points to the datum line; and determining the processing precision of the fastener according to the distance and a preset distance threshold value. According to the invention, the measurement precision of the dimension of the fastener is improved.

The present application discloses a size measurement method, device, equipment and storage medium, relating to the technical field of industrial measurement, including: determining the coordinates of the points to be measured corresponding to the current image data according to the target vision conversion model; when there are special points among the points to be measured, preprocessing the special points among the points to be measured, and updating the points to be measured according to the processing result; measuring the size of the product to be measured according to the coordinates of the updated points to be measured. By the above method, after collecting the current image data of the product to be measured by using an optical measurement device, the coordinates of the points to be measured are determined based on the target artificial intelligence service device according to the target vision conversion model, and it is judged whether there are special points among the points to be measured. If so, the size of the product to be measured is measured based on the geometric measurement strategy, so as to effectively improve the efficiency and accuracy of measuring the size of the product, ensure the reliability of the measurement result, and provide strong support for quality control and decision-making in the production process.

The invention discloses an intelligent tension wire device for high-rise building reference transmission and an offset monitoring method, and relates to the technical field of high-rise building construction surveying and mapping, the device comprises a reference fixing mechanism, a tensioning mechanism, a multi-source surveying and mapping data acquisition module, a data processing module and a data output module; according to the invention, the GNSS real-time dynamic surveying and mapping module, the inertial measurement unit and the linear array CCD visual surveying and mapping sensor are integrated to construct a multi-source surveying and mapping data acquisition system, multi-source data fusion is realized in combination with a Kalman filtering optimization algorithm, the problems of single-dimensional measurement and large error in the prior art are solved, full-dimensional coverage and high-precision measurement of tension wire offset are realized, and the measurement precision is improved. Through real-time calibration of a data processing module and a high-rise building construction coordinate system and format output of an adaptive standard, an extra data conversion step is avoided, the problems of poor data compatibility and untimely construction guidance are solved, and it is ensured that measured data can be directly used for construction regulation and control.

A depth camera-based high-precision three-dimensional size measurement system disclosed by the present invention comprises a point cloud acquisition system and an industrial personal computer system, the point cloud acquisition system is in signal connection with the industrial personal computer system, the industrial personal computer system is also in signal connection with an upper computer, and the point cloud acquisition system can be installed or detached at a target measurement station. The point cloud acquisition system further comprises a light source, a camera, a lens and a fixing support. The invention relates to the technical field of unmanned autonomous measurement docking, in particular to a method for realizing target point cloud data acquisition through a depth camera, realizing target key three-dimensional information measurement by using a point cloud data processing algorithm, accurately sensing the three-dimensional information of a target in a practical application process, providing key data for a decision-making system, and improving the accuracy of target point cloud data acquisition. And the high-precision three-dimensional size measurement system based on the depth camera meets the actual application requirements.

The invention relates to the field of dimension measurement equipment, and discloses a full-automatic dimension measurement device for a basin stand, and the device comprises a feeding mechanism which is used for directionally conveying a to-be-measured product to a detection station; the detection module is arranged on one side of the feeding mechanism, and the detection module is sequentially provided with a code scanning unit, a front face detection unit, a reverse face detection unit, a side face detection unit and a laser detection unit in the conveying direction. According to the invention, by integrating the code scanning module, the front and back visual inspection module, the three-dimensional contour scanning module and the laser thickness measurement module, the full-automatic operation process of automatic feeding, automatic detection and automatic discharging is realized, the detection speed and efficiency are improved, multiple detection functions are integrated on one device, multi-parameter and all-directional detection of products is realized, and the production efficiency is improved. The occupied area and the number of detection equipment are reduced, and the space utilization rate of a production site is improved.

The application relates to a size measurement method, device, computer equipment and computer readable storage medium. The method comprises the following steps: obtaining a 2.5D depth image of an object surface to be measured, and establishing a two-dimensional reference coordinate system in the 2.5D depth image; wherein the 2.5D depth image refers to a two-dimensional image comprising depth information; determining a target position and a coverage area of a virtual probe in the 2.5D depth image under the two-dimensional reference coordinate system; extracting depth information from pixel points in the 2.5D depth image within the coverage area through the virtual probe, and determining a three-dimensional point position according to the depth information and the target position; constructing a three-dimensional reference coordinate system based on the three-dimensional point position and the two-dimensional reference coordinate system; and performing size measurement on the object to be measured based on the three-dimensional reference coordinate system to obtain a size measurement result. The application can improve the accuracy of size measurement.

The utility model relates to a vernier straight rod ruler measuring device for a wide-range inner hole, and belongs to the technical field of object dimension measurement. According to the technical scheme, one end of a ruler frame (1) is provided with a ruler frame cover plate (2) and a vernier scale (8), and the other end is provided with a second measuring head (9); one end of the main ruler body (5) is provided with a measuring head I (6), and the other end of the main ruler body (5) is slidably arranged in a space formed by the ruler frame (1), the ruler frame cover plate (2) and the vernier (8); a spring shaping rod (10) is arranged in the ruler frame (1), and a spring (11) is sleeved on the spring shaping rod (10); the main ruler body (5) is provided with a cavity (21), the spring shaping rod (10) and the spring (11) are both arranged in the cavity of the main ruler body (5), and the spring (11) moves through stretching and retracting of the main ruler body (5). The beneficial effects of the utility model are that the device is high in measurement precision, is wide in measurement range, can rapidly deal with the switching of measurement of different sizes, and improves the measurement work efficiency.

The invention relates to the technical field of steel structure measurement, discloses a high-precision steel structure geometric dimension measuring and positioning method, and aims to solve the problems that an existing measuring means is low in efficiency, limited in coverage range, poor in key feature extraction robustness, difficult to adapt to a complex field environment and lack of a real-time comparison feedback mechanism. The method comprises the following steps: deploying a multi-modal sensing system, and synchronously acquiring laser point cloud and binocular vision data; adaptive denoising and multi-view point cloud splicing are executed; fusing the visual edge and the point cloud curvature features to generate a high-confidence geometric feature set; reconstructing a local fine three-dimensional model based on a moving least square method; dynamically comparing the actual measurement model with the BIM design model to generate a full-surface deviation distribution diagram; and identifying the out-of-tolerance area and outputting a three-dimensional deviation correction instruction. By the adoption of the technical scheme, non-contact measurement and closed-loop correction with millimeter-level precision can be achieved, and the one-time success rate and the intelligent construction level of steel structure installation are remarkably improved.

The invention discloses a multifunctional measuring device for mechanical engineering, the measuring device is used for standard and three-dimensional dimension measurement of cylinder, round pipe and bent pipe parts, the measuring device comprises a frame, a loading mechanism and a multi-degree-of-freedom measuring mechanism, the frame is a door-shaped frame, the loading mechanism is arranged at the bottom side of the frame, and the multi-degree-of-freedom measuring mechanism is arranged at the bottom side of the frame. A multi-degree-of-freedom measuring mechanism is arranged on the rack; the carrying mechanism comprises a carrying module and a clamp assembly, the carrying module is provided with a control panel, two sets of side supporting rods, a transverse supporting rod, a first driving motor, a transmission belt, a mounting base and a carrying disc, the side supporting rods are arranged on the two sides of the bottom side of the rack in parallel, and the front ends and the rear ends of the two sets of side supporting rods are connected through the transverse supporting rod. The measuring equipment is used for standard and three-dimensional size measurement of cylinder, round pipe and bent pipe parts in the mechanical field, the equipment functionality is high, and batch measurement can be achieved.

The present application provides a method and device for measuring the geometric dimensions of a point cloud based on a caliper. The method includes: obtaining a point cloud to be measured, a virtual caliper, and a measurement direction; constructing a search geometry based on the virtual caliper and the measurement direction; segmenting the point cloud to be measured based on the search geometry to obtain a candidate point cloud; extracting point cloud measurement points along the measurement direction from the candidate point cloud based on the virtual caliper; calculating the distance between the point cloud measurement points, and using the distance as the dimension of the point cloud to be measured along the measurement direction. Before extracting the point cloud measurement points, the present application segments the point cloud to be measured by constructing a search geometry to obtain a candidate point cloud, thereby greatly reducing the amount of data and improving computational efficiency. In addition, it can achieve rapid and high-precision measurement of the geometric dimensions of workpieces of different directions and shapes in a variety of application scenarios, thereby improving the accuracy of the point cloud geometric dimension measurement results.