Towards hierarchical blackboard mapping on a whiskered robot

  • Authors:

  • C. W. Fox;M. H. Evans;M. J. Pearson;T. J. Prescott

  • Affiliations:

  • Sheffield Centre for Robotics, University of Sheffield, Western Bank, Sheffield, S10 2TF, UK;Sheffield Centre for Robotics, University of Sheffield, Western Bank, Sheffield, S10 2TF, UK;Bristol Robotics Laboratory, T Block, University of the West of England, Frenchay Campus, Bristol, BS34 8QZ, UK;Sheffield Centre for Robotics, University of Sheffield, Western Bank, Sheffield, S10 2TF, UK

  • Venue:
  • Robotics and Autonomous Systems
  • Year:
  • 2012

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Abstract

The paradigm case for robotic mapping assumes large quantities of sensory information which allow the use of relatively weak priors. In contrast, the present study considers the mapping problem for a mobile robot, CrunchBot, where only sparse, local tactile information from whisker sensors is available. To compensate for such weak likelihood information, we make use of low-level signal processing and strong hierarchical object priors. Hierarchical models were popular in classical blackboard systems but are here applied in a Bayesian setting as a mapping algorithm. The hierarchical models require reports of whisker distance to contact and of surface orientation at contact, and we demonstrate that this information can be retrieved by classifiers from strain data collected by CrunchBot's physical whiskers. We then provide a demonstration in simulation of how this information can be used to build maps (but not yet full SLAM) in an zero-odometry-noise environment containing walls and table-like hierarchical objects.