Andrew Barton-Sweeney

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Camera sensors constitute an information rich sensing modality with many potential applications in sensor networks. Their effectiveness in a sensor network setting however greatly relies on their ability to calibrate with respect to each other, and other sensors in the field. This paper examines node localization and camera calibration using the shared(More)
This paper presents two lifetime models that describe two of the most common modes of operation of sensor nodes today, triggerdriven and duty-cycle driven. The models use a set of hardware parameters such as power consumption per task, state transition overheads, and communication cost to compute a node’s average lifetime for a given event arrival rate.(More)
Although imaging is an information-rich sensing modality, the use of cameras in sensor networks is very often prohibited by factors such as power, computation cost, storage, communication bandwidth and privacy. In this paper we consider information selective and privacy-preserving address-event imagers for sensor networks. Instead of providing full images(More)
We present a new system for interpreting human activity patterns using a sensor network. The paper takes an illustrative approach that presents our methodology using an example, cooking activity detection, in an assisted living application. The activity is detected using a hierarchical probabilistic grammar formulation that is able to detect the activity(More)
The recent technological advances in micro electromechanical systems have promoted the development of a powerful class of sensor-based distributed intelligent systems capable of ubiquitously retrieving multimedia information, namely Wireless Multimedia Sensor Networks (WMSNs). WMSNs are gaining more popularity day by day as they are envisioned to support a(More)
The use of low-cost imagers in sensor network applications is imminent. Small low-power imagers have many potential applications in visual confirmation of events, target recognition, security and entertainment. To make the autonomous operation of imager sensors in such applications possible, smart imager sensors should be able to calibrate their views with(More)
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