Evaluation of ZigBee Technology for a Low-Cost Video Surveillance System
IEEE 802.15.4/ZigBee wireless sensor networks (WSNs) have proved their value as an alternative to cabled systems for patient monitoring. The low power and small size ZigBee devices are able to form self-configuring networks which are expendable such that they can cover an entire hospital area. The current paper presents a low cost video system for patients or elderly persons, also finding applications in security surveillance. The low data rate protocols provided by IEEE 802.15.4 are met by several challenges, due to its protocols having been designed to primarily operate in low traffic load scenarios. Yet, a large volume of data may be generated by some video cameras or vital signs sensors. The system is based on a BeagleBoard -XM platform connected to a video camera (or to other sensors) and a Zigbee module so as to send images or data to the collector station. In the current implementation only the images are acquired and sent to the collector when a movement is detected.
Keywordswireless sensor networks Zigbee BeagleBoard video surveillance open source
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