Abstract
Indoor human tracking and activity recognition are fundamental yet coherent problems for ambient assistive living. In this paper, we propose a method to address these two critical issues simultaneously. We construct a wireless sensor network (WSN), and the sensor nodes within WSN consist of pyroelectric infrared (PIR) sensor arrays. To capture the tempo-spatial information of the human target, the field of view (FOV) of each PIR sensor is modulated by masks. A modified partial filter algorithm is utilized to decode the location of the human target. To exploit the synergy between the location and activity, we design a two-layer random forest (RF) classifier. The initial activity recognition result of the first layer is refined by the second layer RF by incorporating various effective features. We conducted experiments in a mock apartment. The mean localization error of our system is about 0.85 m. For five kinds of daily activities, the mean accuracy for 10-fold cross-validation is above 92%. The encouraging results indicate the effectiveness of our system.
Highlights
IntroductionWith the population of the world increasing, the number of older people is growing inevitably
With the population of the world increasing, the number of older people is growing inevitably.For personal comfort and due to limited medical resources, most of them live alone within their own house instead of nursing houses [1]
We proposed a method to leverage the synergy between location and motion information to solve the problem of human simultaneous tracking and activity recognition (STAR) [16]
Summary
With the population of the world increasing, the number of older people is growing inevitably. For personal comfort and due to limited medical resources, most of them live alone within their own house instead of nursing houses [1]. In their private space, emergency situations may not be noticed by others in time. Lying on the floor for a long time after a fall is one of the most dangerous situations. This will cause complications, and even death for the elderly [2]. How to assist them to live conveniently and safely has become an important social issue
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