Frank C Langbein
Ex Tenebris Scientia
Contents

B. I. Mills, F. C. Langbein, A. D. Marshall, R. R. Martin.

Technical Report GVG 2001-1, Computational Geometry and Computer Vision Group, Dept. Computer Science, Cardiff University, 2001.

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The authors are investigating reverse engineering for reconstructing the shape of simple mechanical parts. Currently, preliminary B-rep models can be created by fitting surfaces to point clouds obtained by scanning an actual part using a 3D laser scanner. The resulting model, although valid, is often not suitable for purposes such as redesign. This is because expected regularities and constraints are not present in the model. This report describes a number of aspects of the geometry of mechanical parts which should be exploited to adjust a B-rep model to improve its usefulness. Aspects considered are geometric constraints between surface parameters, regularly repeated substructures, symmetry, and the presence of features such as slots and holes. The results of a survey of a range of mechanical parts are presented and discussed, showing which of these aspects occur with a frequency that justifies their use in beautification algorithms intended to turn preliminary reverse engineered B-rep models into models engineers expect. 

@TECHREPORT{Mills2001,
  author =       {Bruce I. Mills and Frank C. Langbein and A. Dave
                  Marshall and Ralph R. Martin},
  title =        {Estimate of Frequencies of Geometric Regularities
                  for use in Reverse Engineering of Simple Mechanical
                  Components},
  institution =  {Geometry and Vision Group, Dept. of Computer
                  Science, Cardiff University},
  year =         2001,
  number =       {GVG 2001--1},
  url =          {http://www.langbein.org/research/solids/borg/mills2001/},
  abstract =     {The authors are investigating reverse engineering
                  for reconstructing the shape of simple mechanical
                  parts. Currently, preliminary B-rep models can be
                  created by fitting surfaces to point clouds obtained
                  by scanning an actual part using a 3D laser scanner.
                  The resulting model, although valid, is often not
                  suitable for purposes such as redesign. This is
                  because expected regularities and constraints are
                  not present in the model. This report describes a
                  number of aspects of the geometry of mechanical
                  parts which should be exploited to adjust a B-rep
                  model to improve its usefulness. Aspects considered
                  are geometric constraints between surface
                  parameters, regularly repeated substructures,
                  symmetry, and the presence of features such as slots
                  and holes. The results of a survey of a range of
                  mechanical parts are presented and discussed,
                  showing which of these aspects occur with a
                  frequency that justifies their use in beautification
                  algorithms intended to turn preliminary reverse
                  engineered B-rep models into models engineers
                  expect.},
}
Cite as Estimate of Frequencies of Geometric Regularities for Use in Reverse Engineering of Simple Mechanical Components, http://www.langbein.org/research/solids/borg/mills2001/ by Frank C Langbein [ 6/December/2008, 18:58].
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