Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A meshing method for human hip model

A grid division and model technology, applied in 3D modeling, image data processing, special data processing applications, etc., can solve the problem that the simplified result cannot meet the hip model simplification requirements, etc., to improve local coordinate conversion, avoid accumulation, The effect of surface mesh cell uniformity

Inactive Publication Date: 2017-10-10
HARBIN UNIV OF SCI & TECH
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the simplification result of the existing model simplification method cannot meet the simplification requirements of the hip model, the present invention proposes a mesh division method of the human hip model

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A meshing method for human hip model
  • A meshing method for human hip model
  • A meshing method for human hip model

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0027] Specific implementation mode one: as Figure 9 As shown, a method for meshing a human hip model includes the following steps:

[0028] Step 1: Simplify the hip model;

[0029] Step 2: After the model is simplified, perform subdomain surface reconstruction;

[0030] Step 3: Carry out grid size control according to Step 2;

[0031] Step 4: Perform feature point calculation and region boundary discretization according to Step 3;

[0032] Step 5: After step 4 is completed, surface mesh and volume mesh are generated.

specific Embodiment approach 2

[0033] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the specific process of simplification of the hip model in the step one is:

[0034] Model simplification algorithm:

[0035] The edge folding algorithm based on QEM can well maintain the feature constraints and geometric shape information of the original model, but as the simplification ratio increases, the newly generated vertex folding cost will continue to accumulate until the edge of the feature edge is smaller than the smooth area of ​​the model. Edges, which lead to the wrong selection of edge parts for simplification, and ultimately affect the accuracy of model meshing. This patent adopts the mean value for the folding cost function, so as to obtain better folding sorting; in addition, considering the influence of using vertices to adjoin geometric elements, the area of ​​the triangle is fused into the folding cost function, expressed as:

[0036]

[0037] where n...

specific Embodiment approach 3

[0041] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the specific process of sub-domain surface reconstruction in Step 2 is as follows:

[0042] Firstly, the surface triangular mesh of the simplified model is divided, and then the discretized triangular model is filled with tetrahedron. Through the joint use of wavefront advancing algorithm and Delaunay algorithm, the meshing process is better controlled, which not only realizes the high Quality meshing, but also to ensure the geometric accuracy of the model.

[0043] After the model is simplified, the file is exported as an STL file, and the boundary of the closed model is represented by a set of surface triangles. The storage format is divided into two types: binary and ASCII. The invention adopts the ASCII code format, and the basic record information includes triangle vertices and normal vector information, and does not include topological relations. In order to ensure that the subdoma...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A human body hip model grid dividing method aims to solve the problems that an existing model simplifying method is poor in the simplifying result, and cannot satisfy simplifying requirements of a hip model; the novel method comprises the following steps: 1, simplifying a hip model; 2, rebuilding a subdomain curved surface after model simplification; 3, controlling grid sizes according to step2; 4, carrying out characteristic point calculation and area boundary dispersion according step3; 5, forming a surface grid and a volume grid after step4. The novel method can ensure original geometry characteristics of the simplified model so as to better suit complex model geometries; the surface grid unit formed by aiming at human body hip simplified geometry is even and smooth in transition, thus conveniently forming the volume grid, and increasing calculating accuracy. The human body hip model grid dividing method is applied to the biomedical engineering field.

Description

technical field [0001] The invention relates to a grid division method of a human hip model. Background technique [0002] 1. In terms of model simplification: the human hip model has a large amount of data and complex surfaces, which require fast and high-resolution simplification operations. The existing technology has limited research on simplification algorithms for complex human tissue models, and the simplification results cannot meet the requirements of the hip model. The simplified requirements cannot effectively preserve the geometric features of the original model. [0003] 2. In terms of meshing: the surface boundary contour of the hip model is not obvious, the shape is irregular, and the features are not prominent. The existing meshing technology cannot complete the one-time high-quality automatic meshing of the hip model. Contents of the invention [0004] The invention aims at solving the problem that the simplification result of the existing model simplific...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50G06T17/00
CPCG06F30/23G06T17/00
Inventor 王沫楠
Owner HARBIN UNIV OF SCI & TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com