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Autonomous Robots

, Volume 42, Issue 2, pp 391–421 | Cite as

Monte Carlo planning for active object classification

  • Timothy PattenEmail author
  • Wolfram Martens
  • Robert Fitch
Article
Part of the following topical collections:
  1. Active Perception

Abstract

Classifying objects in complex unknown environments is a challenging problem in robotics and is fundamental in many applications. Modern sensors and sophisticated perception algorithms extract rich 3D textured information, but are limited to the data that are collected from a given location or path. We are interested in closing the loop around perception and planning, in particular to plan paths for better perceptual data, and focus on the problem of planning scanning sequences to improve object classification from range data. We formulate a novel time-constrained active classification problem and propose solution algorithms that employ a variation of Monte Carlo tree search to plan non-myopically. Our algorithms use a particle filter combined with Gaussian process regression to estimate joint distributions of object class and pose. This estimator is used in planning to generate a probabilistic belief about the state of objects in a scene, and also to generate beliefs for predicted sensor observations from future viewpoints. These predictions consider occlusions arising from predicted object positions and shapes. We evaluate our algorithms in simulation, in comparison to passive and greedy strategies. We also describe similar experiments where the algorithms are implemented online, using a mobile ground robot in a farm environment. Results indicate that our non-myopic approach outperforms both passive and myopic strategies, and clearly show the benefit of active perception for outdoor object classification.

Keywords

Active classification Object classification Sequential Monte Carlo Monte Carlo tree Search 

Notes

Acknowledgements

This research is supported in part by the Australian Centre for Field Robotics, the New South Wales State Government, the Australian Research Council’s Discovery Projects funding scheme (Project Number DP140104203), and the Faculty of Engineering and Information Technologies at The University of Sydney under the Faculty Research Cluster Program. We thank Joel Veness, Oliver Cliff, and Graeme Best for helpful discussions. Thanks to Andrew Bate, Jocie Bate, Lasitha Piyathilaka, and Grant Louat at SwarmFarm Robotics for use of the robot and assistance with the hardware experiments. Thanks also to James Underwood and Alen Alempijevic for assistance with sensor calibration.

Supplementary material

Supplementary material 1 (mpeg 55018 KB)

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Copyright information

© Springer Science+Business Media New York 2017

Authors and Affiliations

  1. 1.Australian Centre for Field Robotics (ACFR)The University of SydneySydneyAustralia
  2. 2.Centre for Autonomous Systems (CAS)University of Technology SydneyUltimoAustralia

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