ABSTRACT
Recently, the rapid development and progress of low complexity, high exibility sensor facilities (visual sensor nodes, digital signal processing devices, etc.) has encouraged the emergence of wireless multimedia sensor networks (WMSNs). Multimedia sensor nodes are capable of gathering richer multimedia information (besides scalar physical phenomena) from a monitored region. Hence, WMSNs have been widely applied to various scenarios, such as smart homes, medical applications, and so on. Recently, coverage as a measure of the quality of service (QoS) has drawn much attention in WMSNs. Compared to traditional sensor networks, multimedia sensor networks have exclusive properties, such as sensor viewing direction and angle, as well as object facing direction and location. Based on the above considerations, the coverage problems in WMSNs require specic algorithms and solutions. In this chapter, we mainly survey the existing research in the eld of multimedia device coverage. First, we list and classify
5.4.3 Other Factors 124 5.4.3.1 Deployment Strategy 124 5.4.3.2 Location Information 125 5.4.3.3 Application Requirements 125
5.5 Sensor Deployment and Scheduling 125 5.5.1 Deterministic Deployment 126 5.5.2 Random Deployment 128 5.5.3 Sensor Scheduling 128
5.6 Sensor Management 129 5.7 Coverage Metrics 130
5.7.1 Network Connectivity 130 5.7.2 Network Lifetime 131 5.7.3 Other Coverage Metrics 132
5.7.3.1 Coverage Degree 132 5.7.3.2 Coverage Ratio 133
5.8 Typical Coverage 133 5.8.1 Target Coverage 134 5.8.2 Area Coverage 135 5.8.3 Barrier Coverage 135
5.9 Other Research Issues 136 5.10 Conclusions 138 References 138
o-the-shelf sensor hardware, as well as available coverage models. Furthermore, we describe the state of the art in inuencing factors, deployment mechanisms, sensor selections, and performance metrics for WMSN node coverage. e coverage problem in WMSNs can be divided into three categories: barrier coverage, area coverage, and target coverage. We discuss the three types of coverage and note representative solution algorithms. Finally, we discuss the existing problems and new research trends in key areas. We conclude that WMSN coverage research is still an open issue that has not been fully addressed.
