Network-Adaptive Image and Video Transmission in Camera-Based Wireless Sensor Networks

Abstract

devices at a large scale may be within reach in the foreseeWe investigate image and video transmission in camera-based able future.[1] and [2] are examples of the attempts that are wireless sensor networks (WSNs). Our objective is to de-being made to design camera sensor nodes for WSNs. sign a mechanism that finds the transmission strategies thatIn this paper, we investigate the reliability of image and maximize the expected reconstruction quality of the trans-video transmission over camera-based wireless sensor netmitted data at the base station while making efficient use of works. Data transmission over multihop WSNs is unreliable the limited resources of the WSN. Our approach is based on due to the unreliability of wireless links and node failures. quality-scalable coding and multipath transmission. Unlike Moreover, data generated by sensor nodes can be sensitive to conventional approaches where data is sent over the paths reerrors. Few transmission errors in an image generated and gardless of its importance at the destination, we propose a compressed at a camera source node can render it unusable at network-adaptive transmission mechanism that decomposes the sink.the source bitstream into segments of unequal importance and Although hundreds of papers have been published on wirereserves the most reliable paths to transmit the segments with less sensor networks [3], most of these papers have focused on the highest importance. Moreover, we use unequal segment wireless networks of sensor nodes that collect scalar data such loss protection with erasure codes of different strengths to as temperature, infrared, and pressure sensors. For such netmaximize the expected quality at the destination and propose works, reliability can be simply provided by exploiting spatial a fast algorithm that finds nearly optimal transmission strate-redundancy in the deployment of sensor nodes. A loss of singies. We also present simulation results using a test video segle sensor measurements in this scenario is not problematic quence that show that the proposed transmission mechanism since the same data can be provided (or an occurring event provides adaptability to the time and space varying conditions can be detected) through other sensor nodes. Although this of camera-based wireless sensor networks. solution can be practical for WSNs with low cost scalar data sensor nodes, it is unsuitable for camera-based sensor netmultipdex teranmis-ion, Camerua-based wirotelessisens nealitwkS works, which are characterized by higher cost and larger data multipath transmission, unequal error protection, quality Scaltraffic. able coding. Indeed, the transmission of visual data over camera-basedWSNs is challenging due to the high computational and band-1. INTRODUCTION width requirements of visual data and their sensitivity to errors on one hand and the resource constraints and unreliability Camera-based wireless sensor networks (WSNs) are an emerg-of WSNs on the other hand. Let us consider a clustered wireing research area with many promising appli...

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