title: Availability issues in wireless visual sensor networks.
abstract: Wireless visual sensor networks have been considered for a large set of monitoring applications related with surveillance, tracking and multipurpose visual monitoring. When sensors are deployed over a monitored field, permanent faults may happen during the network lifetime, reducing the monitoring quality or rendering parts or the entire network unavailable. In a different way from scalar sensor networks, camera-enabled sensors collect information following a directional sensing model, which changes the notions of vicinity and redundancy. Moreover, visual source nodes may have different relevancies for the applications, according to the monitoring requirements and cameras' poses. In this paper we discuss the most relevant availability issues related to wireless visual sensor networks, addressing availability evaluation and enhancement. Such discussions are valuable when designing, deploying and managing wireless visual sensor networks, bringing significant contributions to these networks.
authors: DTEC-UEFS, State University of Feira de Santana, Feira de Santana 44036-900, Brazil. danielgcosta@uefs.br.
authors: Daniel G
authors: DG
authors: Costa
authors: IMD-UFRN, Federal University of Rio Grande do Norte, Natal 59072-970, Brazil. ivan@imd.ufrn.br.
authors: Ivanovitch
authors: I
authors: Silva
authors: DCA-CT-UFRN, Federal University of Rio Grande do Norte, Natal 59072-970, Brazil. affonso@dca.ufrn.br.
authors: Luiz Affonso
authors: LA
authors: Guedes
authors: IDMEC-FEUP-UP, University of Porto, Porto 4200-465, Portugal. vasques@fe.up.pt.
authors: Francisco
authors: F
authors: Vasques
authors: INESC TEC-FEUP-UP, University of Porto, Porto 4200-465, Portugal. pportugal@fe.up.pt.
authors: Paulo
authors: P
authors: Portugal