CACE: Exploiting behavioral interactions for improved activity recognition in multi-inhabitant smart homes

• Main Authors: Alam, Mohammad Arif Ul, ROY, Nirmalya, MISRA, Archan, TAYLOR, Joseph
• Format: text
• Language: English
• Published: Institutional Knowledge at Singapore Management University 2016
• Subjects: multi-modal sensing; multiple inhabitants; scalable activity recognizer; smart communities; Computer Sciences; Software Engineering
• Online Access: https://ink.library.smu.edu.sg/sis_research/3581; https://ink.library.smu.edu.sg/context/sis_research/article/4582/viewcontent/CACE_2016_ICDS_afv.pdf
• Institution: Singapore Management University

We propose CACE (Constraints And Correlations mining Engine) which investigates the challenges of improving the recognition of complex daily activities in multi-inhabitant smart homes, by better exploiting the spatiotemporal relationships across the activities of different individuals. We first propose and develop a loosely-coupled Hierarchical Dynamic Bayesian Network (HDBN), which both (a) captures the hierarchical inference of complex (macro-activity) contexts from lower-layer microactivity context (postural and improved oral gestural context), and (b) embeds the various types of behavioral correlations and constraints (at both micro-and macro-activity contexts) across the individuals. While this model is rich in terms of accuracy, it is computationally prohibitive, due to the explosive increase in the number of jointly-defined states. To tackle this challenge, we employ data mining to learn behaviorally-driven context correlations in the form of association rules, we then use such rules to prune the state space dramatically. To evaluate our framework, we build a customized smart home system and collected naturalistic multi-inhabitant smart home activities data. The system performance is illustrated with results from real-time system deployment experiences in a smart home environment reveals a radical (max 16 fold) reduction in the computational overhead compared to traditional hybrid classification approaches, as well as an improved activity recognition accuracy of max 95%.