Springer Science+Business Media
In this paper, the authors address the problem of how to provide a more flexible service for complex event monitoring in Wireless Multimedia Sensor Networks (WMSNs). In particular, they propose C2EM, a cloud-assisted complex event monitoring architecture that involves scalar sensors, camera sensors, cloudlets and clouds to leverage computation offloading reliability, service response time, coverage efficiency and energy efficiency. On clouds, they design an opportunistic service access point selection scheme that provides Quality of Service (QoS) supports for scalar sensor computation offloading. Meanwhile, clouds are responsible for optimizing camera sensor utilization of the whole network. On cloudlets, they design a real-time camera actuation scheme with the objective of minimizing the possible coverage overlaps while providing probabilistic guarantee in residual energy.