Abstract
With the advent and proliferation of wearable sensors, Human Activity Recognition (HAR) has received considerable research attention in recent years. Most existing HAR systems operate in a batch-processing (offline) mode, and they rely upon complex features from accelerometer readings for activity recognition. On the other hand, many applications such as continuous patient monitoring and elder fall detection demand real-time human activity recognition, and existing offline systems are inadequate for these applications. In this paper, we investigate challenges of real-time human activity recognition and present an effective framework based on a waveform pattern matching approach. We introduce the concept of A-Shapelets (activity shapelets), which is a representative pattern for each activity. Our framework incorporates several novel aspects; first, we present a scheme for computing the most distinctive A-Shapelet for each activity. Our scheme extracts repetitive patterns from wave forms. Second, our framework builds decision tree models using a personalized library of A-Shapelets. Third, we present a low-overhead matching algorithm for classifying incoming accelerometer data stream in real-time. This paper reports a series of experiments to evaluate the proposed framework. Our experiments demonstrate that the performance of our scheme is very good and the accuracy is comparable to offline HAR systems.
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Acknowledgements
The authors would like to thank Paula Capece, Grant Cooksey, Dr. Jennifer Gay, Dr. Fredrick Maier for their contributions and help in this project. Also we would like to thank Dr. Matthew Buman for providing us the dataset. This research has been partially funded by the National Science Foundation (NSF) under grant numbers CCF-1442672 and SES- 1637277. Any opinions, findings, conclusions, or recommendations expressed in this material are those of the authors, and do not necessarily reflect the views of the NSF.
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Yazdansepas, D., Saroha, N., Ramaswamy, L., Rasheed, K. (2020). Towards Efficient and Real-Time Human Activity Recognition Using Wearable Sensors: A Shapelet-Based Pattern Matching Approach. In: Sugimoto, C., Farhadi, H., Hämäläinen, M. (eds) 13th EAI International Conference on Body Area Networks . BODYNETS 2018. EAI/Springer Innovations in Communication and Computing. Springer, Cham. https://doi.org/10.1007/978-3-030-29897-5_10
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