A Continuous-Time Model-Based Approach for Activity Recognition in Pervasive Environments
| Autor: | Fulvio Patara, Marco Paolieri, Marco Biagi, Enrico Vicario, Laura Carnevali |
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| Rok vydání: | 2019 |
| Předmět: |
Computer Networks and Communications
Computer science Stochastic modelling Stochastic process Human Factors and Ergonomics Probability density function 02 engineering and technology Measure (mathematics) Computer Science Applications Data modeling Human-Computer Interaction Activity recognition Artificial Intelligence Control and Systems Engineering 020204 information systems Signal Processing 0202 electrical engineering electronic engineering information engineering A priori and a posteriori 020201 artificial intelligence & image processing Hidden Markov model Algorithm |
| Zdroj: | IEEE Transactions on Human-Machine Systems. 49:293-303 |
| ISSN: | 2168-2305 2168-2291 |
| Popis: | We present a model-based approach to Activity Recognition (AR) in Ambient Assisted Living (AAL). The approach leverages an a priori stochastic model termed Continuous-Time Hidden Semi-Markov Model (CT-HSMM), capturing the continuous-time durations of activities and inter-event times. The model is enhanced according to the observed statistics, associating the events with an occurrence probability, and the sojourn time and the inter-event time in each activity with a continuous-time probability density function, allowing effective fitting of observed durations through non-Markovian distributions. The model is updated at run time according to a sequence of time-stamped observations, exploiting the method of stochastic state classes to perform transient analysis and derive a measure of likelihood that an activity is currently performed. The approach supports both online AR, predicting the activity performed at time $t$ using only the events observed until that time, and offline AR, applying a forward–backward procedure that exploits all the events observed before and after time $t$ . The approach is experimented on a real dataset of the literature, providing performance measures that can be compared with those of offline Hidden Markov Models (HMMs) and offline Hidden Semi-Markov Models (HSMMs). |
| Databáze: | OpenAIRE |
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