Efficient Photo Crowdsourcing in Delay-Tolerant Networks with Evolving POIs

Shudip Datta, S. Madria
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引用次数: 3

Abstract

In a disaster or battlefield zone, the rescue workers, soldiers and other survivors (referred to as nodes) may need to survey the damages and send images to the command and control center (the server) in a hop by hop fashion in the absence of any communication infrastructure. The server considers some area/landmark as the point of interest (POI), and distributes the request to the nodes to collect more information about them. Nodes take photos of POIs and share them among each other using store and forward paradigm, called Delay-tolerant Networks (DTNs) to send them to the server. Due to highly intermittent contact characteristics of nodes in a DTN network, and bandwidth and storage limitations, redundant photos need to be omitted in this forwarding technique whereas photos that cover different angles and views of the targets need to be shared. Another challenge is that, over time, some server-listed POIs may not be of importance whereas some new POIs might be of interest. In this work, we propose a scheme that is able to dynamically update the list of POIs based on the current photo metadata, with reduced consumption of the bandwidth, energy and the storage at nodes by sending only important photos of POIs. We compare our proposed schemes with a related well-known scheme [21] to show the scalability of our approaches which provide the same level of photo coverage, but consumes much less energy and bandwidth.
具有演化poi的时延容忍网络中的高效照片众包
在灾难或战场区域,救援人员、士兵和其他幸存者(称为节点)可能需要在没有任何通信基础设施的情况下,以逐跳的方式调查损坏情况并将图像发送到指挥和控制中心(服务器)。服务器将某些区域/地标视为兴趣点(POI),并将请求分发给节点以收集有关它们的更多信息。节点拍摄poi的照片,并使用存储转发模式(称为容忍延迟网络(DTNs))在彼此之间共享它们,将它们发送到服务器。由于DTN网络中节点的高度间歇性接触特性以及带宽和存储的限制,这种转发技术需要省略冗余的照片,而需要共享覆盖目标不同角度和视角的照片。另一个挑战是,随着时间的推移,一些服务器列出的poi可能不重要,而一些新的poi可能会引起人们的兴趣。在这项工作中,我们提出了一种能够基于当前照片元数据动态更新poi列表的方案,通过仅发送poi的重要照片来减少带宽,能量和节点存储的消耗。我们将我们提出的方案与相关的知名方案[21]进行比较,以显示我们的方法的可扩展性,这些方法提供相同水平的照片覆盖,但消耗的能量和带宽要少得多。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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