Advanced CAQ: Comparing Manufactured Products With Underlying CAD Models

Dirk Schaefer, Dieter Roller, Kai Wolf

Research output: Contribution to conferencePaperpeer-review


The quality of manufactured products usually needs to be verified. This paper presents an advanced CAQ approach to compare manufactured objects with reference data from underlying CAD models. First, we give an overview about the current state of the art of optical 3D measurement techniques. Then we discuss the methods developed to implement our prototypic system in which we used a stripe projection system with combined grey-code and phase shifting processing. With this equipment, 3D data of object surfaces can be measured. In order to compare the 3D data (represented in some sensor co-ordinate system) we need a registration to the CAD co-ordinate system. First the selection of a starting point for the orientation parameters is described. For the registration process we use different numerical algorithms to minimise a distance function. To achieve a better performance, we introduce an optimisation process based on 3D voxel arrays. After the registration process several parameters for the kind of geometric displacement can be calculated and visualised. For objects that cannot be measured from one direction we also implemented a pair wise registration as well as a global registration. Furthermore, we present some rapid prototyping examples our CAQ approach has been applied to and outline some application fields.
Original languageEnglish
Publication statusPublished - 1999
EventProceedings of the 15th Conference on Computer-Aided Production Engineering : CAPE´99 - Durham, UK United Kingdom
Duration: 19 Apr 199921 Apr 1999


ConferenceProceedings of the 15th Conference on Computer-Aided Production Engineering : CAPE´99
Country/TerritoryUK United Kingdom


  • Computer-aided quality control
  • Computer-aided manufactuing
  • Rapid prototyping
  • coded light approach
  • 3D measurement


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