Visual Sensor Network Technology and Its Applications

Visual Sensor Network Technology and Its Applications

Li-minn Ang (University of Nottingham (Malaysia Campus), Malaysia) and Kah Phooi Seng (University of Nottingham (Malaysia Campus), Malaysia)
DOI: 10.4018/978-1-61350-153-5.ch001
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Abstract

The combination of image sensors with wireless sensor network (WSN) technology has resulted in a new network technology called a visual sensor network (VSN). On the one hand, VSNs can be seen as an extension of traditional WSNs where image sensors have replaced scalar sensors. On the other hand, the use of image sensors in VSNs brings with it a different set of practical and research challenges. This is because image sensors generate a very high amount of data that would have to be processed and transmitted within the network. In this chapter, we present an introduction to VSN technology and provide an overview of research issues and trends. Issues related to energy efficient processing, collaborative processing, and hardware technology will be highlighted. This chapter will also give a brief introduction to the other chapters in the book with a focus on showing how the topics covered in each chapter relate to the overall picture of visual information processing in wireless sensor network environments.
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Vsn Technology

Researchers and authors have used different terms to describe the various components in the VSN. Figure 1 shows a general structure of a VSN consisting of four main components: Visual Camera Node (VCN), Visual Cluster Head (VCH), Network Node, and Base Station. Figure 1 shows that there a decreasing information flow from the VCNs to the base station. The captured scene data are processed and transformed to useful event data. The focus for the upper levels of the network (VCN and VCH) is on visual information processing and the focus for the lower levels of the network (network node) is on wireless network communications. The primary theme for both upper and lower network levels is to achieve energy efficiency within the constraints of the battery powered nodes.

Figure 1.

General structure of a VSN

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