Assessing Availability in Wireless Visual Sensor Networks Based on Targets’ Perimeters Coverage

Table 1

Visual sensing coverage in wireless sensor networks.

Issue	Approach	Main research challenges
Coverage metric	[18, 19, 21, 30]	Perception of coverage quality; use of quantitative or qualitative measures.
Coverage adjustment	[9, 12, 14, 16, 31]	Computing of optimal orientations; minimum set of sensors; maximal coverage.
Sensing redundancy	[10, 11, 23–25]	Viewing perspectives; sensing failures; availability enhancement.
Target viewing	[24, 26–28]	Target coverage; targets’ contours.