Introduction

We have created a simple and reliable method for surface retouching of polygonal surfaces. From our point of view, the most acceptable application of the proposed technique is automated correction of range data. One of the main drawbacks of range data acquisition with a laser scanner is that data may be missing or erroneous owing to specularities. Standard shape-smoothing approaches are not appropriate for removing such small shape defects, because usually they are applied to the whole model and therefore will over smooth (blur) curved regions without the defects.

Examples

Bunny :
Retouching of a modified тАЬStanford BunnyтАЭ model (courtesy of Yutaka Ohtake of Max-Planck-Institut fuer Informatik). First IH letters are selected using vtkPicker (see Animation page) and then area around them is selected too, and afterwards first area is retouched using height information from the second area and letters are removed from the surface. Processing time on our test configuration (AMD Athlon 1000 Mhz, 128 MB RAM, Microsoft Windows 2000): 1 sec, compact matrix size 1139180 bytes, selected radius of support r=0.2. Model size: 10526 vertices, 20835 polygons, selected area inside: 930 vertices, outside: 807 vertices.
You can also download source model in *.vtk file format (661 KiB) and a point id *.pid file for points inside (5.3 KiB), *.pid file for points around the area (4.6 KiB), or download movie files bellow.
Note: All movie files here are avi encoded with DivX 4.12 codec. To view them in Windows Media Player you need to install the codec firstly. It is avialable to download for free from the DivX site: http://www.divx.com/. Versions 4.x and 5.x can be used, not version 3.x. If you open the movie in Windows Media Player and you don't see anything that means you don't have DivX codec installed.
Animation of the surface retouching of the bunny: one way, 102 KiB, cycle, 194 KiB,
Moai :
The left upper image shows the тАЬMoaiтАЭ model, whose surface was constructed from range data (courtesy of Dr. A. Belyaev of The University of Aizu). A spherical concavity can be observed (central area of the model). The right image is the same surface after retouching. Processing time on our test configuration (AMD Athlon 1000 Mhz, 128 MB RAM, Microsoft Windows 2000): 0.002 sec, compact matrix size 1139180 bytes, selected radius of support r=0.05. Model size: 10002 vertices, 20000 polygons, selected area inside: 16 vertices, outside: 39 vertices.
You can also download source model in *.vtk file format (650 KiB) and a point id *.pid file for points inside (90 bytes), *.pid file for points around the area (236 bytes).

Demo software

Shape Fixer :
Note:This program was compiled for Microsoft Windows and can be used on any PC with Microsoft Windows 9x, Me, NT, 2000 or XP installed. Before running this program you need to download and install VTK runtime library VTK Core (2.8 MiB), if you have not done it already.
Shape Fixer: program to retouch selected areas of the model. You need to provide two files with Id's of vertices (*.pid) inside the area to be retouched and around it. You can use vtkPicker (see Animation page) to create this files.
Usage:shapefixer.exe file.vtk pointsinside.pid pointsoutside.pid radius.

Download: exe, 94 KiB.
Download example data (all examples): exe, 4.7 MiB.

contacts

papers