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Shape Matching based on Shape Distributions

Owner (Institute): Fraunhofer-Institut fuer Graphische Datenverarbeitung
Description: ShapeRetriever is the result of the final project of the master student Alessandro Zolet for the course "Laboritories of Computer Graphics" at the University of Trento. The program perfoms shape retriaval using shape distribution of the distance function as it is defined in the article "Matching 3D Models with Shape Distributions" by R.Osada et al. At the beginning a user should perform indexing of the models which are located in the folder ".\Models\". The models should be represented as connected triangular meshes and saved in VRML fromat. During the indexing the snapshots of the models located in the folder ".\Models\" are taken and are stored as JPEG images in the folder ".\Snapshots\". There is a possibility to rotate the query model. The snapshots in this case are taken on-fly and are stored in the folder ".\Temp\". The folder ".\Shape Retriever\" contains all necessary dlls.
Algorithms: Query >> Shape matching >> Matching based on shape descriptors
Execution Platforms: Windows
Creators:
Uploader: Olga Symonova
Upload Date: Mon Sep 24 16:05:17 EEST 2007

CGAL Surface Mesh Generator on 3D images

Owner (Institute): Institut National de Recherche en Informatique et Automatique
Description: Usage:
- Drag & drop a 3D image file (Analyze *.hdr and Inrimage *.inr formats are supported)
- Mouse interaction is as follows:
- left: rotation
- right: translation
- both: zoom
- Specify an appropriate isovalue in the toolbar (the name of the files provided as examples indicates the appropriate isovalue)
- Specify a mesh sizing parameter (all edges of the output surface mesh will be shorter than this value)
- Specify a distance parameter: The output surface mesh will approximate the isosurface at this accuracy. If only a uniform mesh is sought after, specify a large distance value.
- Press "mesh" on the toolbar, or the key "m". The status bar indicates the number of triangles and timing. The output mesh is non-intersecting, 2-manifold and all triangles are well-shaped. Note that when two sheets of the surface are close to each other, the mesh generator may refine at finer resolution in order to obtain a 2-manifold as output.
- To save the output mesh, press key "o" (options), check "Save files", and mesh again. The output mesh is saved into an off file in the same folder as the 3D image. Any other format could be generated on demand.
- To compare with the marching cubes algorithm executed at the resolution of the 3D image, press "marching cubes" on the toolbar. Press "space" to toggle between visualization of marching cubes vs surface mesh generated by CGAL surface mesh generator.
Algorithms: Meshing >> Surface meshing
Execution Platforms: Windows
Creators: Pierre Alliez
Uploader: Laurent Saboret
Upload Date: Mon Jul 23 10:35:41 EEST 2007

Direct Visibility of Point Sets

Owner (Institute): Technion - Israel Institute of Technology
Description: This algorithm proposes a simple and fast operator, the ``Hidden'' Point Removal operator, which determines the visible points in a point cloud, as viewed from a given viewpoint. Visibility is determined without reconstructing a surface or estimating normals. It is shown that extracting the points that reside on the convex hull of a transformed point cloud, amounts to determining the visible points. This operator is general - it can be applied to point clouds at various dimensions, on both sparse and dense point clouds, and on viewpoints internal as well as external to the cloud. It is demonstrated that the operator is useful in visualizing point clouds, in view-dependent reconstruction and in shadow casting.
Algorithms: Visualization >> Other visualization
Execution Platforms: System Independent
Creators: Ayellet Tal, Ronen Basri, Sagi Katz
Uploader: Laurent Saboret
Upload Date: Tue Jul 17 11:29:20 EEST 2007