The Earth Mover's Distance as a Metric for Image Retrieval
International Journal of Computer Vision
SmartMoveX on a Graph - An Inexpensive Active Badge Tracker
UbiComp '02 Proceedings of the 4th international conference on Ubiquitous Computing
Context Awareness by Analyzing Accelerometer Data
ISWC '00 Proceedings of the 4th IEEE International Symposium on Wearable Computers
Inferring Activities from Interactions with Objects
IEEE Pervasive Computing
Introduction to Data Mining, (First Edition)
Introduction to Data Mining, (First Edition)
Reality mining: sensing complex social systems
Personal and Ubiquitous Computing
Data Mining: Practical Machine Learning Tools and Techniques, Second Edition (Morgan Kaufmann Series in Data Management Systems)
Robust location distinction using temporal link signatures
Proceedings of the 13th annual ACM international conference on Mobile computing and networking
Challenges: device-free passive localization for wireless environments
Proceedings of the 13th annual ACM international conference on Mobile computing and networking
Mobility-Assisted Spatiotemporal Detection in Wireless Sensor Networks
ICDCS '08 Proceedings of the 2008 The 28th International Conference on Distributed Computing Systems
Energy-Efficient Boundary Detection for RF-Based Localization Systems
IEEE Transactions on Mobile Computing
A hybrid discriminative/generative approach for modeling human activities
IJCAI'05 Proceedings of the 19th international joint conference on Artificial intelligence
Location-based activity recognition using relational Markov networks
IJCAI'05 Proceedings of the 19th international joint conference on Artificial intelligence
Sensing motion using spectral and spatial analysis of WLAN RSSI
EuroSSC'07 Proceedings of the 2nd European conference on Smart sensing and context
Mobility detection using everyday GSM traces
UbiComp'06 Proceedings of the 8th international conference on Ubiquitous Computing
Route classification using cellular handoff patterns
Proceedings of the 13th international conference on Ubiquitous computing
Accelerometer-based on-body sensor localization for health and medical monitoring applications
Pervasive and Mobile Computing
Transmission range adaptation based energy efficient neighborhood discovery
Proceedings of the 15th ACM international conference on Modeling, analysis and simulation of wireless and mobile systems
SCPL: indoor device-free multi-subject counting and localization using radio signal strength
Proceedings of the 12th international conference on Information processing in sensor networks
It's tea time: do you know where your mug is?
Proceedings of the 5th ACM workshop on HotPlanet
From RSSI to CSI: Indoor localization via channel response
ACM Computing Surveys (CSUR)
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We explore the problem of detecting whether a device has moved within a room. Our approach relies on comparing summaries of received signal strength measurements over time, which we call descriptors. We consider descriptors based on the differences in the mean, standard deviation, and histogram comparison. In close to 1000 mobility events we conducted, our approach delivers perfect recall and near perfect precision for detecting mobility at a granularity of a few seconds. It is robust to the movement of dummy objects near the transmitter as well as people moving within the room. The detection is successful because true mobility causes fast fading, while environmental mobility causes shadow fading, which exhibit considerable difference in signal distributions. The ability to produce good detection accuracy throughout the experiments also demonstrates that our approach can be applied to varying room environments and radio technologies, thus enabling novel security, health care, and inventory control applications.