66 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 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.

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 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 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 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.

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 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.

A dimension measurement method includes: extracting a plurality of lines from a plurality of images generated by shooting a target area from a plurality of viewpoints, and generating a line segment model which is a three-dimensional model of the target area that is expressed using the plurality of lines; calculating a dimension of a particular part inside the target area, using the line segment model; and outputting the dimension calculated.

The invention discloses a high-precision and high-efficiency spectral interference measurement method and system for wafer-level microstructure size measurement. The method comprises the following steps: constructing an interpolation function to reconstruct two frames of initially collected spectral interference patterns; normalizing the reconstructed two frames of spectral interferograms; selecting an effective position for calculating a spectral phase shift and a phase in the spectral interferogram based on a light intensity equivalent strategy; calculating the phase shift and phase of the spectral interferogram; and calculating the height dimension value of the microstructure contour. According to the method, the advantages of high precision, unconstrained phase shift and large measurement range of the random phase shift algorithm are effectively integrated, and the measurement task of the height size of the microstructure contour can be stably completed with the help of low calculation cost.

The present invention relates to the field of quality inspection technology, and specifically discloses an electronic grating quality inspection method, system, and medium based on digital twins. The method includes: performing three-dimensional modeling on actual parts of standard form to obtain a digital twin model of the actual parts; partitioning the surface area of ​​the actual parts for quality inspection based on the digital twin model of the actual parts to obtain all appearance quality inspection areas of the actual parts; using a digital twin electronic grating group to inspect each appearance quality inspection area of ​​the actual parts to obtain shape and size measurement data and surface defect detection data of each appearance quality inspection area of ​​the actual parts; obtaining quality inspection results of the actual parts based on the shape and size measurement data and surface defect detection data of all quality inspection areas of the actual parts and the digital twin model; realizing accurate partition detection of the quality inspection object, and realizing intuitive visualization of the quality inspection results by using digital twins.

This utility model discloses a non-contact dimensional measuring device for industrial parts, including a chassis. The upper end of the chassis has two symmetrically arranged electric slide rails. A second electric slide rail is connected between the sliding seats of the two first electric slide rails via a support rod. An adjustment platform is located at the front end of the sliding seat of the second electric slide rail via a support seat. An adjustment rod is slidably connected inside the adjustment platform. A rotating measuring seat is located at the lower end of the adjustment rod. The device also includes a quick-release mechanism. The quick-release mechanism includes a mounting base, a magnet, a magnet, a mounting platform, and a secondary fixing assembly. The mounting base is located at the front end of the rotating measuring seat, and the mounting platform is inserted into the mounting base. This non-contact dimensional measuring device for industrial parts can measure complex curved surfaces or three-dimensional dimensions by quickly changing sensors, eliminating the need to switch between different devices to complete multi-dimensional measurements, thus reducing manpower waste and time costs.

This invention discloses a method for measuring the outer contour dimensions of sheet metal based on contour chain corner point allocation and adjacent edge correction. The method acquires a scanned point cloud of the sheet metal to be measured and maps features such as template outer contour corner points, straight edges, and arc edges to the scanned point cloud coordinate system as a reference for outer contour feature localization. Subsequently, the scanned point cloud is projected onto a two-dimensional measurement plane, and the outer contour boundary is obtained using the Alpha Shape boundary extraction method. An ordered outer contour chain is then formed through resampling. Based on this, candidate corner points are scored for contour chain points in the neighborhood of template corner points, and global allocation is performed based on the contour order, relative distance, and directional relationship between template corner points to determine the primary positioning corner points. For corner points with excessive errors or weak features, the corner point position is further corrected based on the straight line or arc fitting results of the adjacent edges on both sides. Finally, the outer contour dimension parameters such as straight edge length, arc radius, and arc center are calculated. This method can improve the stability of outer contour corner point localization and dimension measurement of sheet metal and is suitable for automated detection of sheet metal outer contours.

One implementation provides a device and method for the simultaneous measurement of weight and dimensions of an object, enhancing efficiency by integrating these processes into a single step. One implementation encompasses a flat platform weight scale base containing load cells that ascertain the object's weight. It also features image sensors for capturing images from different angles to determine the object's length, width, and height through image analysis. The processor computes weight from load cell readings and applies image processing to assess object dimensions. This data can be displayed or transmitted, often wirelessly, for external usage, beneficial for industries requiring precise weight and size information to streamline various processes such as logistics and inventory management.

This invention relates to the field of intelligent inspection technology, specifically to a method, system, equipment, and medium for measuring the stiffeners of a train carriage in harsh environments. By deploying top-down through-beam lidar on the front and rear tops of the carriage, point cloud data inside the carriage is collected. Even if the point cloud of the stiffener itself cannot be imaged due to environmental influences, the trailing point cloud appearing on the extension line of the stiffener can still be used, combined with a multi-radar spatial geometric inversion algorithm, to accurately calculate the true three-dimensional spatial position and size of the stiffener. Based on the spatial distribution of the trailing point cloud of the multi-lidar, a multi-line intersection inversion algorithm is used to achieve three-dimensional positioning and size measurement of the stiffener, without relying on the point cloud of the stiffener itself. It has strong environmental adaptability and automation capabilities, significantly improving the robustness, efficiency, and intelligence level of train carriage structure inspection.

A high-precision measurement method for the outer diameter of large workpieces based on an elliptic algorithm includes the following steps: Step S1: Measurement device arrangement; Step S2: Coplanar calibration; Step S3: Point cloud acquisition and preprocessing; Step S4: Ellipse fitting and geometric dimension calculation; According to measurement requirements and different actual working conditions, a suitable elliptic algorithm is selected to fit the planar point cloud, and the geometric dimensions are solved through the ellipse parameters; Step S5: Based on the geometric characteristics of the fitted ellipse, the placement posture of the workpiece is inferred; The placement posture of the workpiece is inferred through the major axis direction, tilt angle, and eccentricity parameters of the ellipse; The major axis direction vector is calculated through the ellipse equation, and the angle between it and the measurement reference axis is the workpiece tilt angle; The tilt degree of the workpiece cross-section is evaluated according to the ellipse eccentricity, and the posture parameter e of the workpiece can be obtained by combining the obtained image data with the relative position of the measuring station and the frame; This invention realizes the integration of geometric dimension measurement and posture evaluation.

Provided is a device that generates a three-dimensional model in a short amount of time. A model generating device according to the present invention comprises: an acquisition unit that acquires measurement data of a three-dimensional form of an object; a simple three-dimensional model generating unit that generates a three-dimensional model on the basis of the measurement data; a dimensions measurement unit that measures dimensions or position information of a predetermined portion of the object on the basis of the three-dimensional model; and a model generating unit that sets the dimensions or position information that is measured to a template of a parametric three-dimensional model of the object and generates a parametric three-dimensional model of the object.

This invention relates to a 3D dimensional measurement method applicable to curved surface structures. The method involves capturing the target curved surface using a camera and laser scanner; generating point cloud data using structured light; registering point clouds across multiple views using the SIFT feature matching algorithm to generate a unified point cloud model; training a feature recognition model using a deep learning algorithm to extract key geometric features of the surface; identifying surface features with different edges, angles, and curvatures through labeling and classification, and converting these features into mathematical representations using a parametric modeling method based on Bezier curves; establishing a comprehensive error model to evaluate multiple error sources, and fitting an error propagation function using experimental data; adjusting the dimensional measurement using the least squares method; and introducing a real-time data acquisition and feedback system, using temperature and humidity sensors to monitor environmental changes, and adjusting scanning parameters including scanning speed and light source brightness using a PID controller.

The invention provides a construction site size measurement method and device and electronic equipment, and the method comprises the steps: obtaining a three-dimensional model of a to-be-measured construction site, planning an inspection route of a measurement device according to the three-dimensional model, controlling the measurement device to move to a target measurement point along the inspection route, and carrying out the posture correction of the measurement device based on an optical mark. Scanning a to-be-measured target based on the measuring device to obtain local point cloud data, converting the local point cloud data to a global coordinate system to obtain global point cloud data, determining actual size parameters of the to-be-measured target according to the global point cloud data, and determining theoretical size parameters of the to-be-measured target according to the three-dimensional model. If the difference value between the actual size parameter and the theoretical size parameter is smaller than a preset difference value threshold value, the actual size parameter serves as the size measurement result of the to-be-measured target, and the technical problems that a traditional manual measurement mode is low in efficiency and poor in precision and has safety risks are solved through the method.

The present invention makes it possible to measure a dimension of a portion without installing a scaffold even if the portion is at high elevation where the dimension cannot be visually measured unless a scaffold is installed. One embodiment of the present invention comprises: a first placement step for moving a first movable body (12) having a dimension portion with at least one dimension known in advance to place the first movable body (12) at a location in the vicinity of an object (80) to be measured; a second placement step for moving a second movable body (14) equipped with an imaging means (14A) to place the second movable body (14) in a photographable area in which a photograph of the object (80) to be measured can be taken; and an imaging step for taking a photograph at each of a first position and a second position different from the first position within the photographable area in which the second movable body (14) has been placed in the second placement step, the photograph including both the object (80) to be measured and the dimension portion as subjects.

This invention discloses a dimensional measurement method, apparatus, stacker, and storage medium supporting rapid changeover. The invention includes: acquiring a target product image, product dimensional data, and product spacing distance of the product being changed; locating the center coordinates of each product detection area within the target product image based on a preset reference point, the product dimensional data, and the product spacing distance; identifying the target edge positions of each product detection area based on the center coordinates and the product dimensional data; and determining the dimensional measurement data corresponding to the measurement request based on the target edge positions and the product dimensional data when a measurement request is received. This invention achieves fully automated visual positioning and measurement during the changeover process, significantly shortening the changeover operation time, improving production efficiency, and enhancing the repeatability and rapid response capability of dimensional measurements. It can be widely applied in the field of machine vision dimensional inspection technology.

The invention relates to a rapid machining and aligning method for a large-size rectangular block shield body, which comprises the following steps of: leveling the shield body, and determining the center line of the shield body; detecting the overall dimension of the hinged part of the oil cylinder; a reference block is arranged on each sub-block of the shield body; measuring coordinates of all the reference blocks and coordinates of hinge parts; the hinged part detection points are analyzed to fit a Cartesian coordinate system; comparing the coordinate value of the hinged part detection point with the measurement result of the overall dimension of the hinged part, and rechecking the coordinate accuracy; outputting a three-dimensional coordinate value of the reference block; each block of the shield body is disassembled and hoisted to a machine tool to be machined; metering and detecting the height of the process reference block, and re-checking whether the height difference value of each reference block is consistent with the difference value of the coordinate Z value; fitting a Cartesian coordinate system in a machine tool operating system, and detecting the coordinate value of the reference block; comparing the coordinate value of the reference block detected by the meter with the coordinate value in the output table; and after the coordinate values of the reference blocks of the shield body blocks are adjusted to be qualified, machining the blocks. According to the invention, each block of the shield body can be directly and independently processed.

The invention relates to the field of part size measurement, in particular to a part size measurement method and system for a mechanical part, and the method comprises the steps: obtaining a to-be-measured grayscale image of a to-be-measured mechanical part and a template grayscale image of a corresponding mechanical part with a known size; processing the to-be-measured grayscale image to obtain a to-be-measured enhanced grayscale image, and extracting all single edge fragments in the to-be-measured enhanced grayscale image; and processing the template grayscale image to obtain a template enhanced grayscale image, extracting all single edge segments in the template enhanced grayscale image, determining a size mapping relation according to the single edge segments and known sizes of the single edge segments, and calculating the actual size of each single edge segment in the mechanical part to be measured based on the size mapping relation. According to the invention, high-precision extraction of multiple directions and weak edges of the mechanical part is realized, and the precision of dimension measurement is improved.

The invention discloses a tray identification method and device based on structural feature point cloud, equipment and a storage medium, and relates to the technical field of computer vision and detection. Acquiring tray RGB information and tray depth information through a binocular camera; generating a point cloud of the tray based on the depth information, aligning the RGB information with the depth information, and extracting an ROI region of the tray in the point cloud; converting the point cloud data into a two-dimensional plane in a camera coordinate system through the projection matrix; the point cloud data in the two-dimensional plane is rotationally scanned, and the main beam orientation of the tray is calculated; cutting the ROI region in the orientation range of the main beam to obtain point cloud data of the measured surface; projecting the point cloud data of the measured surface to a plane orthogonal to the rotating shaft, and calculating the spatial positioning of the tray through a straight line fitting algorithm; the scheme is high in identification precision, accurate in size measurement, high in processing efficiency, adaptive to a high-beat production line and high in automation degree; the method has strong environmental adaptability and anti-interference capability, and is strong in adaptability and good in robustness.

An objective of the present invention is to provide a method whereby the dimensions of a pattern prior to deformation can be measured for a cross-sectional image having a structure in which pattern deformation has occurred.　With regard to a dimension measurement device according to the present invention, the dimensions of a desired portion of a pattern are measured using a cross-sectional image including an etched pattern, and when the pattern is in contact with another pattern, the contacting portion of the pattern is cut, and then a segmentation image of the pattern in which the contact portion is cut is obtained using a semantic segmentation model, contour line data of the pattern is acquired using the segmentation image, the position of the pattern prior to contact is estimated using the contour line data, the amount of displacement between the estimated position and a contour line is obtained, the contour line data is corrected on the basis of the obtained displacement amount, and the dimensions of a desired portion of the pattern are measured on the basis of the corrected contour line data.

1. The name of the design product: 4K industrial measurement camera (HY-6805). 2. The use of the design product: for electronic, hardware, etc. Geometric dimension measurement and image processing function. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view 1.