Visual novelty detection with automatic scale selection

  • Authors:
  • Hugo Vieira Neto;Ulrich Nehmzow

  • Affiliations:
  • Department of Electronics, Federal University of Technology - Paraná, Avenida Sete de Setembro 3165, Curitiba-PR 80230-901, Brazil;Department of Computer Science, University of Essex, Wivenhoe Park, Colchester CO4 3SQ, United Kingdom

  • Venue:
  • Robotics and Autonomous Systems
  • Year:
  • 2007

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Abstract

This paper presents experiments with an autonomous inspection robot, whose task was to highlight novel features in its environment from camera images. The experiments used two different attention mechanisms-saliency map and multi-scale Harris detector-and two different novelty detection mechanisms - the Grow-When-Required (GWR) neural network and an incremental Principal Component Analysis (PCA). For all mechanisms we compared fixed-scale image encoding with automatically scaled image patches. Results show that automatic scale selection provides a more efficient representation of the visual input space, but that performance is generally better using a fixed-scale image encoding.