Visual Recognition of Workspace Landmarks for Topological Navigation

  • Authors:
  • Panos E. Trahanias;Savvas Velissaris;Stelios C. Orphanoudakis

  • Affiliations:
  • Institute of Computer Science, Foundation for Research and Technology—/Hellas (FORTH), P.O. Box 1385, Heraklion, 711 10 Crete, Greece&semi/ Department of Computer Science, University of Cre ...;Institute of Computer Science, Foundation for Research and Technology—/Hellas (FORTH), P.O. Box 1385, Heraklion, 711 10 Crete, Greece&semi/ Department of Computer Science, University of Cre ...;Institute of Computer Science, Foundation for Research and Technology—/Hellas (FORTH), P.O. Box 1385, Heraklion, 711 10 Crete, Greece&semi/ Department of Computer Science, University of Cre ...

  • Venue:
  • Autonomous Robots
  • Year:
  • 1999

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Abstract

In this work, robot navigation is approached using visual landmarks.Landmarks are not preselected or otherwise defined a priori;they are extracted automatically during a learning phase. To facilitate this, a saliency map is constructed on the basis ofwhich potential landmarks are highlighted. This is used inconjunction with a model-driven segregation of the workspace tofurther delineate search areas for landmarks in the environment. For the sake of robustness, no semantic information is attached tothe landmarks; they are stored as raw patterns, along with informationreadily available from the workspace segregation. This subsequentlyfacilitates their accurate recognition during a navigation session,when similar steps are employed to locate landmarks, as in thelearning phase. The stored information is used to transform apreviously learned landmark pattern, according to the current positionof the observer, thus achieving accurate landmark recognition. Results obtained using this approach demonstrate its validity andapplicability in indoor workspaces.