Optical Review

, Volume 1, Issue 1, pp 110–112 | Cite as

3D Reconstruction of Large-Depth Objects Using Fresnel Diffraction of a Ronchi Grating and Simultaneous Recording of Reference and Object Fringes

  • Patrick JEANSON
  • Daniel HENNEQUIN


We propose an active triangulation based range-finding system that, besides its simplicity, has two advantages over similar existing systems. First, the system can acquire range data for large-depth objects since it generates an illumination pattern with large-depth of focus using Fresnel diffraction from a Ronchi grating projected over the entire object surface. Secondly, the system does not need preliminary recording of reference fringes since it displays simultaneously, on a single image, both reference and object deformed fringes. This system offers other properties: it is mechanically simple, uses everyday optical components, is low cost, can be operated via a PC and uses relatively simple image analysis software. Three dimensional reconstructions are illustrated for various objects having 10 cm maximum depth variations. The depth accuracy (typically 0.5 mm for an object located at 350 mm from the camera) is comparable with other systems, but a certain compromise has to be accepted in acquisition time (typically 1 minute). This system can find applications in research laboratories as a tool to provide range data with relatively good depth accuracy.

Key words

3D reconstruction triangulation Fresnel diffraction large-depth objects 


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Copyright information

© The Optical Society of Japan 1994

Authors and Affiliations

    • 1
  • Patrick JEANSON
    • 1
  • Daniel HENNEQUIN
    • 1
  1. 1.Physics DepartmentCollege Militaire Royal de St-Jean, St. Jean-sur-RichelieuQuebecCanada

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