Im2mesh (2D image to triangular meshes)

版本 1.85 (585.1 KB) 作者: Jiexian Ma

Convert 2d multi-phase image to finite element meshes, with poly-line simplification feature.

关注

5.0

(4)

1.3K 次下载

更新时间 2023/1/14

查看许可证

This tool consists of a few functions, e.g., im2mesh, im2Bounds (image to polygonal boundaries), getCtrlPnts (mark intersecting vertex between polygons), simplifyBounds (simplify polygon), poly2mesh (polygon to triangular meshes), printInp (export as Inp file), and printBdf (export as Bdf file).

Features

Exactly reserve the contact detail between different phases.
Able to avoid sharp corners when simplifying polyline.
Support phase selection before meshing (see demo10.m)
Generated mesh can be exported as inp file (Abaqus), bdf file (Nastran bulk data, compatible with COMSOL), and .node/.ele file.
10 examples are presented in demo1.m ~ demo10.m.

Examples

demo1.m - Demonstrate function im2meshBuiltIn, which use matlab built-in function generateMesh() to generate mesh from geometry.
demo2.m - Demonstrate function im2mesh, which use MESH2D to generate mesh from geometry.
demo3.m - Demonstrate how to export mesh as inp, bdf, and .node/.ele file.
demo4.m - Demonstrate what is inside function im2mesh.
demo5.m - Demonstrate the case of 'tolerance = eps'.
demo6.m and demo7.m - Demonstrate parameter 'tolerance'.
demo8.m - Demonstrate parameter 'tf_avoid_sharp_corner'.
demo9.m - Demonstrate parameter 'grad_limit'.
demo10.m - Demonstrate parameter 'select_phase'.

Notes

Im2mesh program identifies different phases in a image by their grayscales. Different grayscales correspond to different phases. If you have 4 level of grayscales in a image, the resulted meshes will contain 4 phases.
You need to do pre-processing to your image before you put the image into Im2mesh program. For example, convert to 8-bit grayscale image, noise removal, and image segmentation (e.g., Otsu's method). What Im2mesh needs is a segmented grayscale image. For those fellows who don't have any experience in digital image processing, please refer to the following information: https://www.mathworks.com/matlabcentral/fileexchange/71772-im2mesh-2d-image-to-triangular-meshes?tab=discussions#discussions_1692673
To make demo2.m~demo10.m run, you need to download MESH2D from https://www.mathworks.com/matlabcentral/fileexchange/25555-mesh2d-delaunay-based-unstructured-mesh-generation, and add the folder (mesh2d-master) to your path. After that, you can start with demo2.m~demo10.m in im2mesh. Check images in the folder (im2mesh\images\...).

If you have any questions or suggestions, feel free to send me an email.

mjx0799@gmail.com, Jan 2023.

Acknowledgments

Great thanks Dr. Yang Lu providing valuable advice on this tool.

引用格式

Jiexian Ma (2024). Im2mesh (2D image to triangular meshes) (https://www.mathworks.com/matlabcentral/fileexchange/71772-im2mesh-2d-image-to-triangular-meshes), MATLAB Central File Exchange. 检索时间: 2024/11/22.

MATLAB 版本兼容性

创建方式 R2018a

兼容任何版本

平台兼容性

Windows macOS Linux

类别

MATLAB > Graphics > Images > Convert Image Type >

在 Help Center 和 MATLAB Answers 中查找有关 Convert Image Type 的更多信息

标签添加标签

致谢

参考作品: MESH2D: Delaunay-based unstructured mesh-generation, Line Simplification, Trace perimeter of binary image with line segments (bwperimtrace)

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

版本	已发布	发行说明
1.85	2023/1/14	Add comments & description	下载
1.84	2023/1/12	Revise Description	下载
1.83	2023/1/12	Revise summary	下载
1.82	2022/8/30	Update description	下载
1.81	2022/8/30	Update description	下载
1.80	2022/1/29	Add im2meshBuiltIn.m, poly2meshBuiltIn.m Update examples	下载
1.76	2020/12/16	improve getCtrlPnts faster	下载
1.75	2020/11/11	Add new parameter 'select_phase'	下载
1.71	2020/10/20	Revise description	下载
1.7	2020/10/20	Add two new parameters for mesh generation	下载
1.6	2020/5/23	make im2Bounds() more readable using getExactBounds()	下载
1.5	2020/5/22	improve im2Bounds.m and getCtrlPnts.m significantly faster	下载
1.1.1	2020/1/12	update description	下载
1.1	2020/1/12	revise demo(), add examples add several functions, like printInp_multiPart(), printInp_multiSect(), printBdf()	下载
0.9	2019/12/22	Improve time efficiency of getCtrlPnts(). Faster. Add new parameter - tf_avoid_sharp_corner. Able to avoid non-convergence when meshing. Rewrite getNodeEle(). Using global numbering. Revise printInp(). Add new parameter - precision_nodecoor.	下载
0.8.2	2019/7/21	new image for cover	下载
0.8.1	2019/7/21	revise getCtrlPnts() for time efficiency	下载
0.8.0	2019/7/13	debug revise printInp(), support linear element and quadratic element revise im2Bounds() and bwperimtrace(), for 4-connected neighbourhood able to clear up redundant vertices that are brought about by delZeroAreaPoly	下载
0.7.0	2019/6/16	debug reorganize part of the code, increase readability revise some comments add calculation of polygon's area, polygon with zero area will be deleted automatically update examples	下载
0.6.2	2019/6/7	update description	下载
0.6.1	2019/6/7	update description	下载
0.6.0	2019/6/7		下载