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Lukas Esterle

Self-Organising Zooms for Decentralised Redundancy Management in Visual Sensor Networks

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  • Lukas Esterle
  • Bernhard Rinner, University of Klagenfurt
  • ,
  • Peter R. Lewis, Aston University

When visual sensor networks are composed of cameras which can adjust the zoom factor of their own lens, one must determine the optimal zoom levels for the cameras, for a given task. This gives rise to an important trade-off between the overlap of the different cameras' fields of view, providing redundancy, and image quality. In an object tracking task, having multiple cameras observe the same area allows for quicker recovery, when a camera fails. In contrast having narrow zooms allow for a higher pixel count on regions of interest, leading to increased tracking confidence. In this paper we propose an approach for the self-organisation of redundancy in a distributed visual sensor network, based on decentralised multi-objective online learning using only local information to approximate the global state. We explore the impact of different zoom levels on these trade-offs, when tasking Omni directional cameras, having perfect 360-degree view, with keeping track of a varying number of moving objects. We further show how employing decentralised reinforcement learning enables zoom configurations to be achieved dynamically at runtime according to an operator's preference for maximising either the proportion of objects tracked, confidence associated with tracking, or redundancy in expectation of camera failure. We show that explicitly taking account of the level of overlap, even based only on local knowledge, improves resilience when cameras fail. Our results illustrate the trade-off between maintaining high confidence and object coverage, and maintaining redundancy, in anticipation of future failure. Our approach provides a fully tunable decentralised method for the self-organisation of redundancy in a changing environment, according to an operator's preferences.

OriginalsprogEngelsk
TidsskriftInternational Conference on Self-Adaptive and Self-Organizing Systems, SASO
Sider (fra-til)41-50
Antal sider10
ISSN1949-3673
DOI
StatusUdgivet - 23 okt. 2015
Eksternt udgivetJa
Begivenhed9th IEEE International Conference on Self-Adaptive and Self-Organizing Systems, SASO 2015 - Cambridge, USA
Varighed: 21 sep. 201525 sep. 2015

Konference

Konference9th IEEE International Conference on Self-Adaptive and Self-Organizing Systems, SASO 2015
LandUSA
ByCambridge
Periode21/09/201525/09/2015

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