Active visual sensing and collaboration on mobile robots using hierarchical POMDPs

Abstract

A key challenge to widespread deployment of mobile robots in the real-world is the ability to robustly and autonomously sense the environment and collaborate with teammates. Real-world domains are characterized by partial observability, non-deterministic action outcomes and unforeseen changes, making autonomous sensing and collaboration a formidable challenge. This paper poses vision-based sensing, information processing and collaboration as an instance of probabilistic planning using partially observable Markov decision processes. Reliable, efficient and autonomous operation is achieved using a hierarchical decomposition that includes: (a) convolutional policies to exploit the local symmetry of high-level visual search; (b) adaptive observation functions, policy re-weighting, automatic belief propagation and online updates of the domain map for autonomous adaptation to domain changes; and (c) a probabilistic strategy for a team of robots to robustly share beliefs. All algorithms are evaluated in simulation and on physical robots localizing target objects in dynamic indoor domains.