Boundary Detection Method for Large-Scale Coverage Holes in Wireless Sensor Network Based on Minimum Critical Threshold Constraint

Figure 4

Implementation process of BLW-MCT: (a) initial distribution of WSN; (b) contour plane of initial WSN’s coverage degree; (c) global coarse boundary of initial WSN; (d) shortest path tree in any global coarse boundary ; (e) local large-scale coarse boundary ; (f) accurate large-scale coverage hole boundary .

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