As a result of recent advances in computing and image processing, three-dimensional (3D) motion tracking and analysis are now within reach of many testing facilities. 3D tracking captures all three space dimensions of a moving point or object simultaneously. Although analysis of most tests and accident reconstructions is now planar (2D), 3D spatial analysis is rapidly becoming straightforward. Specialised 3D tracking and analysis hardware and software, such as the ImageExpress motion analysis workstation produced by Sensors Applications, Inc, can generate 3D solutions in a very automated and user-friendly way. This article shows how systems like this work, and how a 3D solution is generated from many 2D camera images. The software must develop accurate mathematical models. Lens aberrations must be allowed for. For the best accuracy, the 3D solution must be based on a subpixel optimisation of the 3D triangulation solution. It must be easy for the user to establish the geometry and location of the experiment coordinate system. Adequate error analysis must be performerd, and an explicit upper bound is given for the error in terms or various parameters. The article discusses and illustrates each of these functions. ImageExpress is available as a system to implement all these functions and procedures.

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  • Corporate Authors:

    UK and International Press

    120 South Street
    Dorking, Surrey RH4 2EU,   England 
  • Authors:
    • SOBISKI, D J
  • Publication Date: 1998-9


  • English

Media Info

  • Features: References;
  • Pagination: p. 62-6
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00768669
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Sep 10 1999 12:00AM