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Coverage is one of the fundamental issues in wireless multimedia sensornetworks (WMSNs). It reflects the ability of WMSNs to detect the fields.Motivated by the existing-enhancing algorithm of traditional 2D WMSNs, a new 3DWMSNs sensing model is established and a new coverage-enhancing algorithm basedon this model is proposed. This algorithm defines the sensing model astrapezoidal pyramid, calculates the key parameters (tilt angle) then improvescoverage ratio by optimizing it. However, there still exists redundant sensorsin this optimized networks. Aiming at efficiently utilizing these redundantsensors and enhancing coverage ratio, the authors selects the redundant sensorsby introducing the set cover model algorithm, further deploys them to theuncovered area following the greedy policy, so that the whole path coverageperformance of WMSNs is enhanced.

Optimizing coverage of 3D Wireless Multimedia Sensor Networks by means of deploying redundant sensors