Abstract
Video surveillance system, which can provide real-time display of the monitored scene and video playback, has been employed in many areas including commercial security, accident investigation, law enforcement, and emergency response. However, audio which carries important information not available in video is usually not taken seriously and used effectively. In this paper, we develop an enhanced surveillance platform by organically integrating the low-power wireless audio sensor network (WASN) with the traditional visual surveillance network. We can obtain more comprehensive and precise monitoring without the limitation of the line-of-sight and lighting condition. Moreover, this platform is designed and built for providing key support to varieties of applications in wireless multimedia sensor networks. This paper describes the platform architecture, including design, implementation, and performance. We describe the hardware and software components of the audio/video sensors. Then, we present the multimedia synchronization mechanism in the heterogeneous network which is the foundation of applications in the proposed platform. Besides, we describe a sample application and data management mechanism that we have implemented to show the usefulness of our platform. Our experiments include an in-depth analysis of the bottlenecks within the platform as well as measurements for the various components.
Highlights
Video surveillance system plays a very important role in modern life
We have implemented the proposed synchronization control scheme in a general Wireless Multimedia sensor Network (WMSN) platform, in which the multimedia sensor consists of an S3C2440 chip, a microphone, a USB-based camera, and a wireless network card
The metrics used in the experiment are as follows: (1) average packet loss rate, defined as the mean value of the packet loss rate caused by the synchronization control; (2) average delay: the mean value of the delay consumed by each packet of all the reported streams
Summary
Video surveillance system plays a very important role in modern life. There are many applications that significantly benefit from the present of video information, including environmental monitoring, health-care monitoring, personal security, law enforcement, and emergency response [1,2,3]. The proposed platform will be very helpful in many areas with security requirement such as the airport (Figure 2), frontier, and subway station This platform is designed and built for providing a foundation for varieties of multimedia applications that employ the cross-modality. Multi-model fusion and cross-modality have been researched in many applications (event recognition, object tracking [4]) for increasing in accuracy and reliability They usually assume that the audio and visual streams have been obtained and synchronized. We describe a surveillance application that we have developed In this application, we have designed an efficient data management mechanism to allow the synchronized Audio/Visual (A/V) streams to be queried flexibly.
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