|Title:||Video surveillance over wireless networks|
|Advisors:||Cao, Jiannong (Comp)|
Wireless communication systems.
Wireless sensor networks.
Hong Kong Polytechnic University -- Dissertations
|Department:||Department of Computing|
|Pages:||ix, 94 leaves : illustrations ; 30 cm|
|Abstract:||Recent advances in wireless communication and portable devices have led to rapid development of wireless applications. Wireless video surveillance is one of the important topics. Wireless video surveillance can be deployed flexibly to cover different surveillance areas. However, it is still challenging to construct a scalable wireless video surveillance system. First of all, wireless networks are often associated with the scarcity of communication bandwidth. Thus, video transmission in wireless environment must be very efficient in order to avoid network congestion. Secondly, the asynchronous communication model and dynamic topologies exacerbate the unreliable wireless connections. As a result, it is difficult to adopt traditional server-client streaming services in wireless video surveillance systems. Thirdly, user mobility issues bring additional challenges to the video transmission process. There are two key problems in construction of a scalable video surveillance system on top of wireless networks: in-network processing in the asynchronous wireless system and wireless video transmission. In this thesis, we investigate the challenging issues in developing video surveillance systems over wireless networks and propose a solution to address the issues. Our research will be divided into three parts as following. In the first part, we study the Publish/Subscribe (Pub/Sub) paradigm to review its decoupling characteristics in time, space and synchronization. We utilize these characteristics and propose a design of Pub/Sub based video surveillance system on top of interconnected wireless mesh networks (WMNs) and wireless sensor networks (WSNs). In the proposed framework, mobile users submit their subscriptions on particular events, i.e. traffic jam in Nathan Road. Subscriptions will be registered to the system and only related video content will be published to mobile users. This novel design provides users with a new approach to interact with wireless camera nodes. The proposed Pub/Sub middleware can help achieve both efficient use of wireless network resource and efficient detection of related events. In the second part, we introduce a design of heterogeneous networks, which consists of Wireless Mesh Networks (WMNs) and Wireless Sensor Networks (WSNs), to support the Pub/Sub. In this part, we study the packets and information translation between WSNs and WMNs, and propose a specific strategy to interconnect these two types of networks. The event detection is realized by utilizing wireless sensors. Mesh nodes are in charge of subscription/event mapping and video content transmission. A prototype system is implemented with testing results to validate the effectiveness of our design. In the third part, we focus on wireless mesh networks and study the problem of delay constrained Pub/Sub in order to optimize the in-network processing for real-time video subscription and publishing. We propose algorithms to customize the Pub/Sub middleware to support video surveillance for real-time events. Simulation and testing are conducted to evaluate the performance of our proposed solutions.|
|Rights:||All rights reserved|
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