Numérisation 3D au plus proche du réel - Scannérisation du Pont Neuf



  • Guillaume Thibault
  • Auguste d'Aligny


  • EDF (Electricité de France) DER (Direction des Etudes Recherches)
  • Mensi


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  • Bibliography :

    "3D Digitization", Imagina's Proceedings pp98-105,1994

  • Abstract :

    Maintenance operations are currently prepared by 3D simulation using CAD models of plants. For the simulation to be valid, the modeled geometry must constitute a faithful reproduction of their real counterparts. This means being able to digitize precisely and swiftly environments which are congested, hostile, and large-scale. New sensors are currently being developed by the laboratories in answer to these requirements. One of these sensors, SOISIC, designed by the MENSI with the active assistance of Electricité de France, shows remarkable performance in terms of the quality of clouds of 3D points it is able to capture. The data it provides are characteristically dense (several millions of points captured for each surface of a given scene), exhaustive, and precise (from the millimeter scale to S meters). The sensor is also able to digitize very large scenes (up to 70 meters). It was thus possible to scan a turbine building. It was likewise possible to scan the Pont Neuf in Paris: the edifice was digitized, as were the trees in the Square du Vert Galant, and the statue of Henri IV, in order to simulate lighting. 1 Digitization principle: laser triangulation survey of three-dimensional coordinates of points on the surfaces of objects present within the scene. Processing software The modeling? based on clouds of points, is ensured by a recent program called IPSOS3D which allows: - interactive display of the cloud of points to familiarize operators with the scene (e.g. for knowledge of a hostile environment); - reconstruction of geometric primitives and surfaces. Regarding automatic detection of primitives within the cloud, developments based on genetic algorithms have yielded positive experimental results. This presentation will deal with the possibilities of scanning, modeling and 3D recognition. Several ongoing applications will also be presented. Planned short-term applications: - RATP: monitoring of deformations in the vaults of the Paris metro. - Museography: monitoring of aging of the collections. - Remote dimensional control of foundry items at 1000°C. - Computer graphics: realistic modeling of architectural and natural settings.

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    (oo) Same Institute
    (ooo)La Machine à remonter le temps: de Karnak à Louqsor

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