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Entropy 2015, 17(3), 1358-1378; doi:10.3390/e17031358

Hidden State Conditional Random Field for Abnormal Activity Recognition in Smart Homes

College of Information Science and Technology, Dalian Maritime University, Dalian 116026, China
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Received: 16 January 2015 / Revised: 25 February 2015 / Accepted: 10 March 2015 / Published: 18 March 2015
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Abstract

As the number of elderly people has increased worldwide, there has been a surge of research into assistive technologies to provide them with better care by recognizing their normal and abnormal activities. However, existing abnormal activity recognition (AAR) algorithms rarely consider sub-activity relations when recognizing abnormal activities. This paper presents an application of the Hidden State Conditional Random Field (HCRF) method to detect and assess abnormal activities that often occur in elderly persons’ homes. Based on HCRF, this paper designs two AAR algorithms, and validates them by comparing them with a feature vector distance based algorithm in two experiments. The results demonstrate that the proposed algorithms favorably outperform the competitor, especially when abnormal activities have same sensor type and sensor number as normal activities. View Full-Text
Keywords: hidden state conditional random field; abnormal activity recognition; smart home hidden state conditional random field; abnormal activity recognition; smart home
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Tong, Y.; Chen, R.; Gao, J. Hidden State Conditional Random Field for Abnormal Activity Recognition in Smart Homes. Entropy 2015, 17, 1358-1378.

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