44 results about "Central line" patented technology

Disclosed in the present invention is a matrix transformation-based improved design method for a diffuser. Firstly, inlet and outlet position information of a diffuser is extracted, and then a double-coefficient adjustable polynomial is used to design a central line of the diffuser between the centroid of an inlet section and the centroid of an outlet section, and a change rule of the area of each section of the diffuser along the central line. In the aspect of transition of the shapes of an inlet and an outlet of the diffuser, once the inlet section and the outlet section have been mapped to a ξ-η space, a plurality of transition shapes between the inlet section and the outlet section are obtained by using a matrix transformation-based improved algorithm. The shapes of the inlet and the outlet, and each transition shape jointly form the shape of each local section of the diffuser along the central line. On the basis of the shapes of the sections, the change rule of the sectional area, and the change rule of the central line, the final three-dimensional geometry of the diffuser can be constructed under an o-xyz three-dimensional coordinate system, and the three-dimensional geometric modeling of the diffuser can be flexibly and controllably designed.

The invention relates to the field of building informatization models, and discloses a linear engineering three-dimensional modeling method and system, and the method comprises the steps: S1, reading plane data of a line center line, carrying out the differential processing of a curve segment into a plurality of straight line segments, and calculating the actual length of each line segment and a stake number corresponding to each point; s2, reading the longitudinal section data of the line center line, and when the mileage and the elevation of the longitudinal section adopt different proportions, carrying out conversion to obtain converted longitudinal section data; s3, calculating coordinates of elevation inflection points according to the converted longitudinal section data, inserting the elevation inflection points into the plane data, and then calculating the elevation of each vertex by using an interpolation method to obtain three-dimensional coordinates of each vertex; and S4, drawing a three-dimensional path corresponding to the line center line according to the three-dimensional coordinate of each vertex. According to the method, the three-dimensional center line can be quickly generated through the center line and the longitudinal section of the existing two-dimensional plane graph.

The application discloses a kind of automatically generated river section and feature extraction method, comprising: by specified numerical value, along the river center line / longitudinal axis line generation point, and point is set to number along river direction, and adjacent line recursive generation center line is given to these line number;According to the order of numbering, traverse point, and make perpendicular to its adjacent line;Generation perpendicular segment and the intersection of adjacent line, and these intersection points are given the numbering value consistent with point;With intersection point along the direction of existing perpendicular segment, continue to make perpendicular to its adjacent line;Respectively, the intersection of perpendicular segment and adjacent line is solved, and these intersection points are given the numbering consistent with the starting point of perpendicular segment;Until perpendicular segment reaches river boundary;According to center line number and the intersection point number of generated perpendicular segment, line segment is generated, and automatic section establishment is completed;Information extraction point is generated by the generated section line;Extract section two / three-dimensional grid data information.The application realizes the automatic section generation and attribute extraction of river with relatively severe width and curvature variation.

The invention discloses an AUV underwater local path planning method and system based on an improved VFH algorithm, and the method comprises the steps: converting the environment where an AUV is located into a three-dimensional grid map, obtaining the distance data of the surrounding environment of the AUV, processing the data, setting the advancing direction, dividing a space into beta * omega spherical sectors according to the resolution alpha, and carrying out the calculation of the beta * omega spherical sectors; calculating an obstacle strength value and determining a sector to which each grid belongs, constructing a sector strength matrix graph for the three-dimensional grid map, setting a threshold value and screening passable sectors, combining adjacent passable sectors and selecting reserved wide valleys, and calculating cost by adopting an improved cost function; the method comprises the following steps: selecting a geometric center line direction with minimum cost and reserved wide valley as a moving direction, constructing a three-dimensional dynamic situation field, calculating a step length base value according to a potential field gradient and an adaptive step length formula, performing correction and dynamic adjustment processing, then determining a final step length, moving the AUV according to the final step length, updating the state, and circulating until the AUV reaches a target. And safe and efficient path planning of the AUV is realized.

The invention relates to a method, device and equipment for positioning channels and collaterals based on three-dimensional point cloud information, and the method comprises the steps: generating a pseudo-color space through extracting depth information according to human body three-dimensional point cloud data, extracting a human body foreground region in the pseudo-color space, and segmenting and projecting the human body foreground region according to a human body proportion and a topological relation. Generating central coordinates of each region of the human body, obtaining a human body center line, and generating human body back meridians according to the human body center line and the human body foreground region through a traditional Chinese medicine meridian equal-body-cun theory. According to the method, multi-layer grid aggregation calculation can be adopted, point cloud noise interference is effectively suppressed, and the stability of generated coordinates is improved; based on the equal-body-size principle of traditional Chinese medicine, different human body shapes are automatically adapted through percentage grid positioning; and a center line among the head, the neck and the waist can be accurately obtained, and a reliable reference is provided for calculation of human body back meridians and collaterals.

A road center line determination method, device, equipment and storage medium are disclosed. The method comprises: acquiring a first boundary contour line and a second boundary contour line on both sides of a target road; determining an outer bounding rectangle of the boundary contour line and a projection point of each boundary point on the outer bounding rectangle; extending a connecting line between each boundary point and the corresponding projection point, determining a first associated point intersecting the contour line, and taking a midpoint between each boundary point and the corresponding associated point as a feature point corresponding to the boundary point; based on the change direction of the boundary contour line, sorting each first feature point and each second feature point, and based on the sorted feature point sequence, determining a center line corresponding to the target road. Through the technical scheme of the embodiment of the present application, the determination efficiency and accuracy of the road center line can be improved, and the combined center line can perfectly retain the geometric shape of the original two lines.

The present application belongs to the field of mechanical design, and particularly relates to a method for extracting a center line of a rod body based on internal point array information of a three-dimensional model. The method comprises the following steps: S1, extracting an outer surface and a bounding box information of a rod body model with a cross-sectional radius R of the rod body; S2, generating an initial point array in the bounding box; S3, extracting a point inside the rod body model and a nearest point of the point to the outer surface of the rod body model; S4, calculating coordinates of a center O of a rod body cross section corresponding to each point in a point array sub-set extracted in step S3; and S5, performing curve fitting on all points O to obtain a center line of the rod body model. The present application can realize fast extraction of a center line of a non-straight rod body three-dimensional model, and is particularly suitable for application in a rod body design environment with a relatively complex shape.

The invention provides a baseline iteration adjustment method of a tunnel three-dimensional model, and belongs to the technical field of tunnel modeling. The method comprises the steps of obtaining a three-dimensional model of a tunnel through photogrammetry; according to the center line of the tunnel and the section information of the tunnel, the first discrete points in the center line are shifted to the side walls of the tunnel, so that coordinates of the second discrete points on the design lines of the side walls on the two sides of the tunnel are obtained. In the extending direction of the three-dimensional model, a plurality of first feature points are marked at the corresponding hole openings in the three-dimensional model, and a plurality of second feature points are marked in the corresponding hole bodies in the three-dimensional model. And endowing the coordinates of a second discrete point at the portal of the tunnel to the first feature point to obtain the coordinates of a second feature point. And correcting the coordinate of the second feature point through the accumulated chord length of the second feature point in the extension direction of the three-dimensional model. And correcting the coordinates of the second feature point again by calculating the shortest distance from the second feature point to the design line. According to the adjusting method, the precision of tunnel three-dimensional modeling can be improved.

The invention provides an airway geometric parameter measurement method and system, and relates to the technical field of medical image processing, and the method comprises the steps: obtaining airway foreground voxel data corresponding to a chest CT, and converting a voxel index coordinate into a world physical coordinate according to image space meta-information; obtaining a center line point set through three-dimensional skeletonization, establishing candidate connecting edges in a preset neighborhood, generating a topological tree based on a strategy with branch penalty terms, and completing branch segmentation and generation coding; the method comprises the steps that firstly, a tail end branch meeting a preset condition serves as a starting point for backtracking, the section area and the section equivalent diameter of each node slice are calculated, branch node direction vector score cross angle parameters are fitted, finally, a structured file is summarized and output according to algebraic labels and other dimensions, and stable measurement and standardized output of airway multi-scale geometric parameters can be achieved. And the comparability and repeatability of group scale analysis are improved.

The application discloses a center line to inner hole bottom surface vertical distance gauge for a reducer shell bearing hole, which comprises a base unit, a calibration unit, an auxiliary unit and a measuring unit; the measuring unit comprises a measuring table and a table seat for mounting the measuring table; the calibration unit comprises a calibration piece arranged on the plane of the base unit, and the height of the calibration piece is designed as the standard vertical distance between the lowest point of the bearing hole and the inner hole bottom surface minus the radius of the bearing hole; the auxiliary unit comprises an auxiliary base, and the calibration part of the auxiliary base is tightly attached to the plane of the base unit; the table seat is arranged on the auxiliary base; the mechanical reference conversion of the calibration piece and the auxiliary base converts the complex three-dimensional space measurement into simple height difference comparison, the single measurement time is greatly shortened, the efficiency is improved compared with the traditional three-coordinate measurement, the cost of the gauge is reduced, the enterprise cost is significantly reduced, and the operation is simple, so that workers can quickly and simply start and complete standardized detection.

The invention provides an automatic calculation method for a rail transit shield interval evacuation platform, and the method comprises the steps: opening a plane design scheme file after an AutoCAD secondary development program is operated, and reading road design scheme data and tunnel inner diameter data; the method comprises the following steps: inputting and storing a rail transit shield interval tunnel rail ultrahigh value, a rail structure height, a center line offset and a corresponding mileage range, setting design parameters of an evacuation platform, determining a platform design range, segmenting the evacuation platform, and calculating the distance between the outer side of the evacuation platform and a line center line in a segmented manner; calculating the clear distance from the center line of the shield interval tunnel line to the evacuation platform, and determining the width of the evacuation platform; the digital and intelligent level is greatly improved, the data accuracy is 100%, and compared with a traditional manual calculation mode, the calculation efficiency and the calculation precision are greatly improved.

The invention discloses a device for acquiring a center line of a tubular substructure and marking the tubular substructure and equipment for analyzing a medical image. The device comprises a trained backbone unit which extracts semantic information and depth information of the medical image; the trained centrality head is used for receiving the semantic information and the depth information and predicting the centrality of the tubular substructure; a trained landmark header which receives the semantic information and the depth information and predicts a starting point and an ending point of the tubular substructure; and the information integration unit is used for extracting center lines of the tubular substructures according to the starting point and the ending point by using a tracking algorithm and taking the centrality as a loss field, and the information integration unit sorts the center lines and marks the tubular substructures according to the center lines. The device for acquiring the central line of the tubular substructure from the medical image and marking the tubular substructure and the equipment for analyzing the medical image have higher robustness.

The application discloses a complex conduit first-order continuous center line reconstruction method based on scanning point cloud data and belongs to the field of engine geometric parameter digitization detection. After obtaining scanning point cloud data of an outer surface of a conduit, straight pipe data and curved pipe data of the complex conduit are segmented. For the segmented straight pipe and curved pipe data, random sampling cylinder fitting and circle fitting operation based on intersection of a vector point and a main plane are respectively performed to obtain trend lines of the straight pipe and the curved pipe. For the trend lines of the straight pipe and the curved pipe, center points of different pipe sections based on equally-spaced vertical section planes are solved, and linear fitting is respectively performed on the center points of the different pipe sections to obtain a plurality of discontinuous center line sections of the complex conduit. A cubic spline curve is adopted to perform first-order derivative interpolation fitting between adjacent straight line sections and circular arc section center lines to obtain a complex conduit first-order derivative continuous center line. The reconstructed center line is used as a reference for calibration of a pipe special-purpose measuring device measuring capacity.

This invention relates to a rapid method for determining conical field-of-view occlusion, comprising: S1, setting Δ blk Let the occlusion triangle be represented by its three vertices A, B, and C, and the center line of the conical field of view. Determine the occlusion triangle Δ. blk Does the plane S containing the antenna reflector aperture intersect with the conical field of view? If they intersect, then the Δ on the upper part of plane S... blk Divided into (Δ blk )1、(Δ blk S2; Determine whether it is consistent with (Δ) blk S1. Intersect; S3. Determine if any of A, B, and C is inside the conical field of view; S4. Determine Δ blk Does there exist an edge that intersects the conical field of view? S5, If (Δ blk If 2 is not empty, then for (Δ) blk 2. Repeat steps S2 to S4; traverse the triangular mesh of all obstructions; traverse the azimuth of all conical fields of view to determine the azimuth of the obstructed conical fields of view. This invention enables rapid and quantitative calculation of the spatial distribution of the azimuth of a two-axis rotatable point beam antenna when it is obstructed by a star.

The application discloses a tunnel three-dimensional center line extraction method based on octree occupancy map and distance transformation, which takes tunnel scene point cloud sequences registered to the same global coordinate system as input, incrementally constructs a global octree occupancy map to obtain an occupancy leaf voxel center point set, extracts a candidate occupancy voxel center point set and performs three-dimensional principal component analysis to obtain a stable axial direction, constructs a cross-section plane along the stable axial direction, extracts a point set within the slice thickness range, projects the point set to a two-dimensional coordinate system, rasterizes a cross-section obstacle grid, performs two-dimensional distance transformation, takes a point corresponding to a maximum value of a distance field as a maximum inscribed circle center, and back-projects the point to obtain a slice center point and a clear radius, accumulates continuous effective center points, applies a maximum turning angle constraint, and outputs a tunnel three-dimensional center line. The application does not require strict alignment of the input tunnel coordinate system Z-axis with the gravity direction, and does not depend on an odometer trajectory or a platform attitude estimation axial direction, and is suitable for straight or curved tunnel structures with longitudinal slopes.

The application discloses a shot specimen deformation analysis method, device, equipment and storage medium. The principal component analysis of point cloud data can determine the geometric center, major axis, minor axis and minor axis, automatically adapt the specimen placing posture and eliminate the influence caused by the position deviation. The point cloud projection based on the feature data can simplify the three-dimensional data into two-dimensional data, reduce the subsequent processing complexity while retaining the key deformation features. The preprocessing of the projected point cloud can improve the point cloud continuity, eliminate noise and void, generate a clear and stable optimized image, and ensure the accuracy of the subsequent center line extraction. The extraction of the center line corresponding to the optimized image and the back projection can obtain an accurate and continuous three-dimensional center line point cloud, avoiding the deviation caused by manual intervention. The deformation analysis of the shot specimen based on the center line point cloud can realize the accurate calculation of the curvature and the equivalent arc height and the automatic verification of the simulation model, and comprehensively improves the reliability and efficiency of the deformation evaluation.

This invention discloses a design method for a volute, a volute itself, a volute assembly, and a range hood. The design method includes: determining the base circle diameter of the volute and drawing the base circle; drawing N center lines based on the center of the base circle, each center line passing through the center of the circle, and the angle between any two adjacent center lines being a preset angle; selecting one center line as the 0° center line, and determining the position of the first main spiral control point on the 0° center line, setting a second main spiral control point on the 90° center line, and setting a third main spiral control point on the 270° center line; determining the position of the spiral control points on the remaining center lines based on the spiral radii of the spiral control points on the N center lines forming a second-order arithmetic sequence; and obtaining a complete spiral by connecting the positions of the N spiral control points using spline curves. This volute design method is simple and reliable, and can quickly design volutes suitable for large airflow conditions.

This application provides a method, apparatus, equipment, and medium for extracting the centerline of an irregular cross-section tunnel structure, relating to the field of tunnel structure construction and inspection technology. The method includes: obtaining three-dimensional point cloud data of the tunnel; obtaining two-dimensional point cloud data based on the three-dimensional point cloud data; clustering the two-dimensional point cloud data to obtain a two-dimensional centerline point set; horizontally segmenting the three-dimensional point cloud data based on the two-dimensional centerline point set to obtain a cross-sectional point cloud dataset between two adjacent center points in the two-dimensional centerline point set; obtaining a top arch centerline point set and a bottom slab centerline point set based on the cross-sectional point cloud dataset and the two-dimensional centerline point set; and obtaining a three-dimensional central axis point set of the tunnel based on the top arch centerline point set and the bottom slab centerline point set. The method of this application can more effectively utilize the three-dimensional data of the tunnel, thereby accurately extracting the centerline of an irregular cross-section tunnel.

The invention relates to the technical field of medical treatment, and provides a probe positioning method and device, a surgical instrument positioning system, surgical instrument positioning equipment and a medium, a probe is provided with a first marker and a second marker, and a center line formed by connecting the first marker and the second marker is parallel to the axis of the probe and extends towards the space through the tip of the probe; the method comprises the following steps: determining an axis vector of a probe by obtaining a first center coordinate of a first marker and a second center coordinate of a second marker of the probe in a calibration state; obtaining a first group of center coordinates corresponding to the first marker and a second group of center coordinates corresponding to the second marker when the probe is in different poses, and obtaining the axis distance between the tip of the probe and the target marker in the axis direction; after the intraoperative first center coordinate of the first marker and the intraoperative second center coordinate of the second marker on the probe are obtained, the intraoperative positioning coordinate of the tip of the probe is obtained based on the axis distance, and the accuracy of probe positioning is improved.

The application provides a method, system, storage medium and equipment for generating a three-dimensional axial side view based on BIM, and relates to the field of BIM modeling. The method comprises the following steps: obtaining a target area mechanical and electrical pipeline BIM entity model and extracting a longitudinal center positioning line as a line body model; taking the end points of the line body model as vertices, constructing four squares that are pairwise edge-sharing and perpendicular to the plane of the three-dimensional axial side view on a plane perpendicular to the line body, and stretching the squares along the line body to form a cuboid; projecting the line body model alone to obtain a front direction center line; judging the center line occlusion state based on the spatial position relationship of the cuboid and performing blanking processing; and binding the blanking state and the spatial coordinates of the line body model to generate an axial side system diagram. The application aims to solve the problems of low efficiency of manual drawing of three-dimensional axial side views, serious redundancy and occlusion of entity model drawing lines, difficulty in positioning after simplification, and spatial relationship distortion caused by invalid blanking algorithm in the existing mechanical and electrical pipeline BIM forward design.

The application discloses a center line extraction method and device based on topological invariance and a storage medium, relates to the technical field of image data processing, and comprises the following steps: initializing a preset number of central axis balls based on the geometric features of a model grid, wherein the central axis balls are constrained by the surface features of the model grid; contracting the radius parameters of the central axis balls to obtain iterative central axis balls; and extracting a target central axis edge corresponding to the iterative central axis balls as a center line. The application solves the technical problem that related technologies have poor precision when processing complex geometric shapes, and thus cannot accurately extract a center line, and achieves the technical effect of effectively improving extraction precision and efficiency while keeping main geometric features of a model.

The invention provides an automatic river topographic section interpolation method and system based on discrete data, and relates to the field of hydraulic engineering digitization. Comprising the steps of obtaining discrete river topographic data, and judging a river upstream position according to center line scatter starting features; performing cross analysis on intersection points of the left and right bank scatter points, the center line scatter points and the existing section, and calculating section width, section direction vector and section on-way distribution information; generating a center line normal passing through the center line scatter points as an interpolation reference line, and generating equal-ratio interpolation points along the normal direction; constructing a local affine coordinate system by taking an intersection point of a central line scatter point and a section as an original point and taking a central line direction vector and a section direction vector as two axes, and performing elevation assignment on the generated scatter point by using an inverse distance weight method; and according to the cross section on-way distribution information, interpolation and assignment processes are repeated on adjacent cross sections in sequence, terrain interpolation of the river channels clamped by all the cross sections is completed, interpolation results are sorted and output, and fine river channel terrain data are formed.

A frame which is a frame having a rectangular shape in plan view, four intersection points at which center lines of the length directions of the respective side portions of the frame intersect with each other are provided at four corner portions of the frame, the frame is arranged on a flat surface, a height Z1 from the flat surface is measured at the four intersection points, a first intermediate point which is an intermediate point of two intersection points among the four intersection points that are located on the same side portion of the frame, a second intermediate point which is an intermediate point of the intersection points and the first intermediate point, and a difference between a maximum value and a minimum value of the heights Z1 of the intersection points is 25 µm or less when a point among the four intersection points, the first intermediate point, and the second intermediate point at which the height Z1 is the smallest is set as a reference point (zero).

The invention provides a method and system for generating a three-dimensional axial side map based on BIM, a storage medium and equipment, and relates to the field of BIM modelling, and the method comprises the steps: obtaining an electromechanical pipeline BIM entity model of a target area, and extracting a longitudinal center positioning line as a line body model; by taking the end point of the line body model as a vertex, constructing four squares which share one side in pairs and are vertical to the plane of the three-dimensional shaft side view port on a plane vertical to the line body, and stretching along the line body to form a cuboid; independently projecting the line body model to obtain a center line in the front view direction; judging a center line shielding state based on a cuboid space position relation and executing blanking processing; and binding the blanking state with the space coordinates of the line body model to generate an axis-side system diagram. The method aims at solving the problems that in existing electromechanical pipeline BIM forward design, the manual drawing efficiency of a three-dimensional axial side drawing is low, entity model mapping line redundancy shielding is serious, positioning is difficult after simplification, and space relation distortion is caused by blanking algorithm failure.

The application relates to a kind of section measurement and data processing method and device of quasi-rectangular shield tunnel, belong to the technical field of shield tunnel construction measurement, method includes: obtaining the design parameter of quasi-rectangular shield tunnel section to be measured;Receive total station at the position of section to be measured, at least three measuring points of the actual pipe wall of small circular arc and collect three-dimensional coordinates;Based on the three-dimensional coordinates of all measuring points, solve the measured radius and measured center coordinates of small circular arc at the section to be measured by applying space circle fitting algorithm calculation;For each target measuring point, according to measured center coordinates, measured radius, design track surface elevation and the elevation difference between target measuring point and design track surface, the horizontal distance measured value of target measuring point relative to design line center line is calculated by using the geometric characteristics of small circular arc;Based on the horizontal distance measured value and design horizontal distance value of each target measuring point, the data processing of section to be measured is completed.The application has the effect of improving the measurement accuracy and operation efficiency.

The invention relates to the technical field of ships, in particular to a lofting method of a double-curved-surface fairlead piece, the fairlead piece and a ship, and the lofting method of the double-curved-surface fairlead piece comprises the following steps: obtaining a geometric center point; drawing a first normal vertical line of the curve through the geometric center point, wherein the first normal vertical line is a vertical center line of the fairlead piece; making a plurality of bisectors within a set distance according to a set step length, wherein the bisectors are parallel to the vertical center line; making a corresponding section solid shape line according to the plurality of bisectors and the waterline, and making a corresponding fairlead vertical solid shape line according to the vertical center line and the waterline; acquiring an intersection point of the second normal vertical line and each section solid line; connecting all the projection points to obtain a solid shape line of a second normal vertical line, wherein the solid shape line of the second normal vertical line is a normal solid shape line of the horizontal plane of the fairlead; and drawing a lofting drawing of the fairlead piece. The installation difficulty can be reduced, joints between the outer edge of the fairlead piece and the bulwark are reduced, and the attractiveness is improved.

This invention discloses a method for accurately measuring the endpoint of a conduit. The steps are as follows: calibration using multi-view vision to acquire an image of the curved pipe; removal of image distortion and image correction based on the parameters of each camera; segmentation of the pipe region and extraction of the pipe edges; fitting the centerline of the conduit image; determining the spatial position of the centerline based on epipolar constraints; sampling n points on the spatial centerline; establishing a central plane using the camera center and two of the sampling points; calculating the intersection point of the central plane and the circumference of the curved pipe end face, and determining the specific position of the intersection point using the radius of the curved pipe and the sampling points; projecting this intersection point onto the spatial centerline, where the projected point is the conduit endpoint. This method does not rely on ellipse fitting, thus avoiding errors caused by ellipse fitting. Furthermore, this method does not first search for the projection point in the image and then determine the actual position of the endpoint, but directly determines the position of the endpoint in space, overcoming the drawback of the projection point's position differing in different images.

The invention discloses a subway plane design curve drawing arrangement method, device and equipment and a storage medium, and is applied to the technical field of subway tunnel drawing design. The method comprises the following steps: running an AutoCAD secondary development program; reading subway tunnel line design scheme data and tunnel size data through an AutoCAD secondary development program; setting track data of each section of subway curve tunnel according to the line design scheme; a curve needing drawing is selected, and a drawing viewport is created; inserting a design center line plane curve table in the range of the drawing viewport; drawing a sketch of the relationship between the deviation value of the center line of the tunnel and the route mileage in the range of the drawing viewport; a plane curve section tunnel center line main point coordinate table is inserted in the drawing outlet viewport range; and inserting a drawing frame and a design description in the layout. The subway plane curve tunnel center line and the design center line drawing can be automatically arranged, and the working efficiency is greatly improved.

The application provides a waterway boundary and center line mining method and system for AIS ship trajectory big data, and comprises the following steps: S1, carrying out Delaunay triangulation on the track points of the AIS ship trajectory data, and screening the triangles in the track point triangulation to obtain the original boundary of the track points; S2, carrying out smoothing processing on the obtained original boundary of the track points, further carrying out Delaunay triangulation on the vertex point set of the original boundary of the track points after the smoothing processing, and screening the vertex point set triangulation to obtain the waterway contour; and S3, constructing the waterway graph and the center line of the waterway based on the waterway contour.

The invention discloses a method for automatically extracting geometric information of a tubular three-dimensional model. Establishing a reference plane and a rotating center shaft by searching a key curved surface of the tubular three-dimensional model; key points are created through intersection points between all the reference planes and all the rotating center shafts, and sorting is managed according to rules; solving the bending radius through any one bending surface; and finally, geometric information of the tubular three-dimensional model is obtained through the steps, the pipe diameter is obtained, and the center line of the tubular three-dimensional model is created. According to the method, the topological geometric information of the tubular three-dimensional model is extracted, so that related work of automation of the tubular three-dimensional model can be developed.