24 results about "Grid deformation" patented technology

The present application belongs to the technical field of image processing, and specifically relates to a three-dimensional face model automatic generation method, which is characterized by the following specific steps: data loading processing, user model generation based on computer vision, user model grid re-topology, model grid local shape optimization, model grid fusion splicing, and output result model. The grid generation method ensures 2D mapping accuracy according to face key points; the grid deformation and smoothing method makes the user model and the standard face model closer in 3D space under the premise of reasonable deformation, so that the mapping is more accurate; the re-topology model grid local shape optimization utilizes original grid information to correct the grid deformity and improve the quality of the model. The model grid fusion splicing adopts the grid deformation and grid smoothing method, so that the output result meets the design requirements, guarantees the integrity and high quality of the model, and reduces the post-processing work.

The invention belongs to the field of structure optimization design, and discloses a coordinate space mapping-based geometric reconstruction method for topological optimization characteristics of a curved surface blade structure. On the basis of a topological optimization result of a three-dimensional curved surface blade structure of an engine, topological optimization geometric reconstruction is carried out on internal ribs, deformation from a three-dimensional grid to a two-dimensional grid is realized firstly, and a three-dimensional node grid is mapped to a rectangular flat plate according to a certain proportion through grid deformation according to a three-dimensional density optimization result. Secondly, processing a density result of the surface of the flat plate to obtain a plane density image, capturing key geometric features according to an image morphological processing and skeleton extraction technology, and obtaining skeleton point coordinates of corresponding parts; and mapping the extracted pixel skeleton points back to grid nodes in an actual two-dimensional model, mapping back to grid nodes of an original three-dimensional blade according to the two-dimensional grid nodes, reconstructing the model in CAD software according to the three-dimensional grid nodes, and completing geometric reconstruction of topological optimization of the three-dimensional curved surface structure in combination with an original cavity structure.

Embodiments of the present disclosure relate to an image processing method, device, equipment and medium, wherein the method comprises: acquiring a plurality of groups of image pairs with different grid resolutions; according to the order of the grid resolutions from small to large, sequentially calculating the grid vertex positions of the corresponding second images according to the corresponding second images and the associated reference images of each group of image pairs in the plurality of groups of image pairs, and sequentially passing the grid vertex positions of the previous grid resolution to the next layer until the target grid deformation image of the image pair corresponding to the maximum grid resolution is acquired, and calculating the grid flow according to the target grid deformation image and the first image, so as to align the original reference image and the first image according to the grid flow. Thus, the grid vertex positions of the previous pair of images are passed from coarse to fine according to the order of the grid resolutions from small to large to control the grid shape deformation, and the grid flow is determined according to the deformed grid, thereby improving the acquisition efficiency and robustness of the grid flow and improving the image alignment effect.

The application discloses a kind of based on dynamic mesh technology's hydraulic machinery system component progressive wear quantity quantification prediction method, comprising: constructing fluid machinery three-dimensional geometric model;CFD numerical calculation is carried out under specified boundary condition based on fluid machinery three-dimensional geometric model, obtains fluid machinery internal steady-state initial field;Based on fluid machinery internal steady-state initial field, inject silt particles, introduce wear model, obtain transient sand steady flow field;Based on transient sand steady flow field, according to wall surface damage rate, calculate wear depth;The difference of wear depth of current time and last time is calculated, and the grid deformation of current time is obtained;According to the grid deformation of current time, it is decomposed in particle impact velocity direction, reach the effect of wall surface topography change, obtain wear depth under total time, wall surface topography change, transient flow field change.The application improves the prediction precision of fluid machinery wear depth.

The invention discloses a three-dimensional net capture visualization method based on simulation data. The three-dimensional net capture visualization method is used for efficiently presenting the dynamic wrapping effect of a rope net capture target at a Web end. Comprising the following steps: S1, calculating AABB and OBB of a target to be captured, uniformly sampling on the surfaces of bounding boxes, emitting rays along an outer normal, colliding with the surfaces of the target to solve an offset distance, comparing average fitting distances of the two types of bounding boxes, and selecting an optimal bounding box; s2, the sampling density is determined according to the mesh size, the opposite face of the incoming direction is removed, sampling points are generated on the other five faces, the sampling points and the mesh body nodes are bound one to one according to the minimum space distance, redistribution is carried out if conflicts occur, and a mapping dictionary M is output; and S3, by taking the simulation position at the contact moment as a starting point, performing linear interpolation on the nodes in the M to a target position according to a fixed time window delta T, reading simulation data by other nodes, and submitting WebGL to drive grid deformation, thereby realizing vivid transition from free motion to target fitting, avoiding real-time recalculation at a browser end and improving rendering performance.

This invention belongs to the field of automotive parts manufacturing, specifically involving a simulation system, method, equipment, and medium for evaluating the impact of materials on wheels. Based on a target wheel test bench, a corresponding simulation model is established; several sets of material properties, yield strength and tensile strength, are input to generate SN curves; corresponding stress criteria are generated based on the SN curves; the corresponding weight is obtained, optimization results are obtained, and the optimization results are evaluated. This invention converts the wheel bending fatigue life into equivalent fatigue strength through SN curves, and uses high-order mesh deformation technology to quickly and efficiently evaluate the impact of yield strength and tensile strength on wheel weight. It provides a scientific and accurate simulation prediction method for evaluating the impact of material properties on wheel weight, with broad application prospects and market value. This addresses the problem of difficulty in quickly and accurately evaluating the quantitative impact of new materials on wheel weight under bending fatigue conditions.

The invention discloses a moving femtosecond laser processing morphology prediction method considering light spot evolution, and particularly relates to the field of femtosecond laser processing. Comprising the following steps: establishing a three-dimensional geometric model of a to-be-processed material, and performing mesh generation on the three-dimensional geometric model to obtain a mesh model; establishing a dual-temperature model; determining laser intensity; determining a laser source item according to the laser intensity, and inputting the laser source item into the double-temperature model to obtain lattice temperature and electron temperature; when the lattice temperature is greater than or equal to the sublimation temperature, determining a grid deformation speed, removing a material of the grid model according to the grid deformation speed to obtain a deformed grid model, and obtaining an ablation depth; in the next pulse, the radius of the light spot is updated; and the lattice temperature, the electron temperature and the ablation depth are updated until the lattice temperature and the electron temperature are balanced, and the final ablation depth is obtained. Based on the method, the prediction accuracy can be improved.

This invention relates to the fields of remote sensing and geographic information engineering technology, and particularly to a land use change identification method driven by multi-source spatial data. The method includes: acquiring multi-source spatial data covering a target area and performing standardized preprocessing to generate a priori land use map as the data assimilation background field; constructing a land use abundance change process model based on material conservation, and obtaining a spatial discrete framework through adaptive grid deformation; establishing a multi-source differentiable observation operator, and solving the core parameters through four-dimensional variational assimilation with land use conversion constraints to complete land use change identification and rolling dynamic monitoring. In this invention, land use change is modeled as a continuous physical process, overcoming the limitations of traditional discrete-time hard classification and comparison methods. This effectively improves the temporal coherence of change identification and the consistency of multi-source data fusion, meeting the needs of high-precision long-term land use dynamic monitoring, and providing stable and reliable data support for natural resource surveys, monitoring, and land spatial management.

The application discloses a wing robust optimization design method based on Hessian eigenvector dimension reduction, and belongs to the technical field of aircraft design optimization, and comprises the following steps: determining initial design variables corresponding to an initial geometric shape of a wing; updating a wing geometric shape, and then adjusting a fluid calculation grid by using a grid deformation module; performing dimension reduction on an uncertainty space based on a Hessian eigenvector, and calculating aerodynamic performance data and a first-order gradient of sample points; inputting the aerodynamic performance data and the first-order gradient of the sample points into a UQ module, and calculating gradient information of the initial design variables; and judging, by an optimizer, whether a wing configuration determined by the initial design variables is convergent. The application reduces the calculation cost and improves the calculation efficiency while ensuring the accuracy, and provides an efficient technical path for engineering-level aerodynamic robust design under high-dimensional uncertainty conditions.

The invention discloses a three-dimensional object deformation method and system based on semantic driving, and belongs to the technical field of computer graphics and three-dimensional shape processing. The method comprises the following steps: firstly, acquiring a three-dimensional model and a target text, extracting features by using a cross-modal semantic model, and driving a grid to deform; and then binding the Gaussian point cloud to a deformation grid, dynamically optimizing geometry by means of a diffusion model multi-view rendering signal, adjusting the Gaussian color through a texture repair model, and finally outputting a three-dimensional shape with consistent geometry and texture. The whole process does not need manual annotation, semantic deformation of any object can be achieved, and the universality is high. According to the method, the structural integrity and multi-view consistency of the object can be kept, and the texture can be automatically repaired, so that the three-dimensional content editing efficiency and the reality sense of an output result are remarkably improved.

The application discloses a kind of grid deformation data enhancement methods based on WGAN-GP model, it is related to image processing, data enhancement technical field, including: constructing training dataset and test dataset;WGAN-GP model is constructed;WGAN-GP model is trained based on training dataset;The performance of model is evaluated using test dataset, determine grid deformation data enhancement model;Random noise is respectively used as input with medical endoscope image, output corresponding deformation grid, respectively with medical endoscope image and deformation grid warp operation obtains the medical endoscope image after data enhancement.This application constructs WGAN-GP model and automatically generates deformation grid, by deformation grid to medical endoscope image is carried out deformation enhancement, enhanced medical endoscope image is real and has certain diversity, effectively solve the problem of data sample scarcity and data sample unbalance, to improve the precision and generalization of artificial intelligence algorithm model based on medical endoscope image.

The invention provides a local updating system and method for a high-precision map of a strip mine, and the system comprises six modules: a multi-source data collection module, an intelligent change detection module, an incremental three-dimensional reconstruction module, a space-time database management module, a visual verification module and a mining and stripping amount measurement module. PointNet + + and U-Net networks are fused to realize change region extraction with the precision less than or equal to 1m, only local reconstruction is carried out on the change region, centimeter-level seamless fusion is realized by adopting graph optimization and Laplacian grid deformation, and updating is completed in a short time. The model supports version second-level rollback, WebGL30FPS rendering and TIN method automatic amount calculation, the error is less than 1.2%, the bandwidth is saved by 90%, the GPU occupation is reduced by 75%, the requirement of an unmanned mine card for the current trend less than or equal to 30 minutes under the pace of daily propulsion of a strip mine is met, mining while updating is realized, and a real-time data base is provided for intelligent scheduling and digital twin mines.

The invention discloses a machine learning-based low-altitude air route time slot distribution method and system. The method comprises the steps of constructing a four-dimensional space-time grid, dividing voxel units, collecting an airspace state and forming a feature sequence; based on the state feature sequence, constructing a voxel space-time diagram containing space and time edges; fusing intrusion time coding, inputting the improved STSGCN model, and generating a risk and time sequence; constructing a reversible reasoning link, and executing reverse time sequence reasoning to obtain a reverse time sequence; generating oscillation parameters by using the time sequence, and forming a dynamically adjusted time slot adjustment sequence; and constructing an airspace elastic field, executing grid deformation, generating an elastic grid and outputting a scheduling result. According to the invention, through combination of improved STSGCN prediction and reversible predicted intrusion time reasoning with time slot self-adjustment and airspace elastic grid updating, dynamic safe distribution of low-altitude airway time slots and airspace capacity improvement are realized.

The application provides a high-efficiency mesh deformation method based on global-local space nested radial basis function, which comprises the following steps: determining a surface deformation control point and a space to-be-deformed mesh node; establishing a global low-precision RBF model; establishing a global-local space nested RBF model; realizing global-local space nested RBF model interpolation; performing RBF sub-model boundary weighted correction; performing far-field fairing; and outputting a deformed mesh. Compared with the traditional radial basis function mesh deformation, the modeling calculation amount of the application is reduced to the original times, and the interpolation calculation amount is reduced to the original n times, wherein n is the RBF sub-model quantity. While ensuring the mesh deformation precision, the mesh deformation efficiency is greatly improved, and the application is a high-efficiency and robust mesh deformation method.

A method for obtaining a seismic fracture finite element model grid including topographic relief comprises the steps of firstly determining a target area, then obtaining high-precision topographic data, then obtaining actual node coordinates, then determining geodetic coordinate information of the target area, then converting the geodetic coordinate information into plane coordinate information, then setting a grid, and then generating a plane basic grid. According to the actual node coordinates and a specified deformation equation, deforming the plane foundation grid, and obtaining an earthquake fracture finite element model grid including topographic relief; the plane foundation grid is deformed into a finite element model grid conforming to the topographic relief of the fault, so that the actual topographic relief of the fault can be simulated, the simulation effects of slippage of the fault, expansion of fracture and propagation of seismic waves are improved, and the accuracy of seismic fracture simulation is high. Therefore, the grid generated by the design can simulate the topographic relief of the fault, and the accuracy of earthquake fracture simulation is high.

The application discloses a geographical grid space data processing method, a terminal device and a computer readable storage medium. The method comprises the following steps: receiving a position information acquisition request, wherein the position information acquisition request at least comprises to-be-measured position latitude and longitude information and a grid level; converting the to-be-measured position latitude and longitude information and the grid level into a grid number based on a preset function; when receiving a region investigation request based on the grid number, acquiring geographical grid space features of a to-be-investigated region; and constructing a region model according to the geographical grid space features and the grid number. The problem that the geographical data obtained finally is inaccurate due to large grid deformation in related grid cutting technology is solved. The effect of improving the accuracy of geographical grid data is achieved.

The application provides a segmented manufacturing welding shrinkage and assembly deviation compensation method for a suction sail of a ship, comprising: if a local shrinkage vector in a prediction distribution diagram exceeds a preset threshold, adjusting welding sequence parameters through an iterative optimization algorithm to obtain an optimized welding path planning; extracting segmented boundary coordinates from the optimized welding path planning, performing three-dimensional scanning data fusion on a curved surface structure, and judging a cumulative effect of a size deviation; obtaining the judged cumulative effect of the size deviation, simulating an assembly fitting process by using a grid deformation algorithm, and determining a deviation correction matrix of a potential misalignment area; applying a virtual force field constraint to the segmented model through the determined deviation correction matrix to obtain a corrected segmented geometry shape; generating a digital twin model for assembly alignment according to the corrected segmented geometry shape, judging whether an overall precision meets a preset standard, and obtaining a final manufacturing adjustment scheme.

The invention discloses an envelope fitting method based on image edge extraction, electronic equipment and a storage medium, and aims to solve the problems of limited geometric deformation application scene, tedious mesh deformation operation, inaccurate mask method fitting and the like in the existing envelope fitting technology. The method specifically comprises the following steps: step 1, extracting an edge path and AABB data of a container image; step 2, calculating edge UV coordinates of the whole edge path; step 3, calculating internal UV coordinates of the container image; step 4, constructing vertex data and index data required by rendering; and step 5, rendering in a WebGL environment to realize natural envelope fitting of the target image and the container edge. The method can automatically extract edges, accurately fit irregular graphs, avoid manual control point operation, is suitable for scenes such as front-end image editing, and improves the sense of reality of image synthesis and user experience.

The invention provides a gas compressor non-axisymmetric end wall modeling method based on adjoint shape optimization, and belongs to the technical field of aero-engine gas compressor design. Specifically, an axisymmetric end wall gas compressor serves as an optimization object, and cascade single-channel original geometric model establishment and structured grid division are sequentially completed; the method comprises the steps of obtaining isentropic efficiency of a gas compressor designed by adopting an axisymmetric end wall through flow field simulation, establishing an optimization target and constraint conditions, solving design variable sensitivity based on an adjoint shape optimization method, arranging control points on the outer surface of the end wall, calculating the total displacement of the control points in combination with the sensitivity, and achieving end wall grid deformation through a radial basis function. And carrying out simulation verification on the performance of the geometric configuration of the current end wall, and then carrying out iterative optimization until the end wall accords with an optimization target and constraint conditions. The optimization efficiency and the modeling precision of the end wall of the gas compressor are improved, the isentropic efficiency of the gas compressor is improved, and it is guaranteed that performance parameters of the optimized gas compressor are stable.

This invention discloses a multi-level partitioning constraint method and apparatus for general mesh deformation problems, relating to the field of mesh deformation technology in numerical computation. The method includes: reading mesh data; partitioning the object surface mesh into multiple levels; constructing a local radial basis function interpolation system within each partition using a greedy algorithm; using the difference between the previous level deformation result and the target deformation result as the deformation target to progressively correct the positions of the object surface and volume mesh nodes; calculating the global deformation using radial basis functions in the first level, and limiting the local deformation range using dual-constraint radial basis functions in non-first levels; accelerating the calculation of dynamic and static boundary distances using distance search based on K-dimensional tree pre-screening; and outputting the deformed mesh. This invention avoids the high cost of direct global solution through multi-level partitioning and hierarchical point selection strategies, significantly reducing the computational cost of constructing a radial basis function interpolation system in large-scale 3D mesh deformation while maintaining mesh quality and deformation accuracy, effectively improving the efficiency of deformation calculation.

The invention provides a grid parameterization deformation method for three-dimensional curved surface perforation shape preservation, and belongs to the technical field of geometric reconstruction and grid deformation. Obtaining a to-be-deformed grid containing three-dimensional curved surface perforation characteristics, and embedding the to-be-deformed grid into the three-dimensional control body; arranging a plurality of control points in the three-dimensional control body, and determining a primary function construction mode of each control area according to the type of the control points and by combining the three-dimensional curved surface characteristics so as to adapt to the complex change of the curved surface; determining movement parameters of control points according to curved surface perforation distribution, hole shape characteristics and control point types of the target structure object; and adjusting the control points based on the primary function and the movement parameters of the control area, and driving the to-be-deformed grid to realize deformation. According to the method, the three-dimensional curved surface and perforation characteristics are synchronously considered in the primary function construction and control point movement process, the integrity of a perforation structure, the consistency of hole shapes and the continuity of aerodynamic shapes can be effectively kept in the grid parameterized deformation process, and the deformation quality of a complex perforation curved surface structure is remarkably improved.

The invention relates to a multi-level mesh deformation method for a three-dimensional mesh model. The method comprises the following steps: sequentially carrying out edge folding on a to-be-deformed mesh according to the error size of each edge to obtain a to-be-deformed simplified mesh; the constructed objective function is a function meeting the minimum total energy, and constraint energy is added into the total energy; calculating to obtain an initial value of a deformed simplified grid after deformation of the to-be-deformed simplified grid, and performing iterative calculation on a vertex position in the initial value of the deformed simplified grid based on a target function to obtain an optimal deformed simplified grid; expanding the optimal deformation simplified grid based on the information of the folding edge to obtain an expanded deformation grid; the method comprises the following steps: firstly, simplifying a high-resolution input grid into a low-resolution grid through edge folding operation by constructing a grid resolution hierarchical structure, and recording a folding sequence; for a low-resolution grid, a smooth enhanced approximately rigid grid deformation algorithm is adopted, constraint energy is added, global optimization is carried out, and optimal rigid deformation is solved.

The invention relates to the technical field of computer vision and biomechanical simulation, and discloses a personalized customization method and system for western-style clothes, which breaks through the limitation that motion deformation cannot be captured by traditional static measurement by constructing a dynamic volumetric model containing skeleton driving and soft tissue deformation, and improves the customization efficiency of the western-style clothes. The muscle expansion effect during limb movement can be accurately simulated, the proportion of fabric stretching to body compression is scientifically distributed on the basis of a mechanical balance principle in combination with a unique two-way rigidity displacement complementary mechanism, the accurate compensation amount which meets the movement requirement and is not excessively loose is calculated, and in addition, the energy-minimization-based grid deformation technology is utilized, so that the energy consumption is reduced. When the dynamic allowance is invisibly injected into the model, the contour line of the original design and the sewing completeness are kept, so that the contradiction that slimming and comfort are difficult to achieve at the same time in the traditional customization is solved, the wearing experience of static fit and non-compression in movement is realized, and the dependence on the tailoring experience is greatly reduced.