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JACIII Vol.24 No.5 pp. 685-702
doi: 10.20965/jaciii.2020.p0685
(2020)

Paper:

Smartphone Naïve Bayes Human Activity Recognition Using Personalized Datasets

Moses L. Gadebe, Okuthe P. Kogeda, and Sunday O. Ojo

Department of Computer Science, Tshwane University of Technology
Private Bag X680, Pretoria 0001, South Africa

Received:
July 10, 2018
Accepted:
July 15, 2020
Published:
September 20, 2020
Keywords:
tilt angles, signal magnitude vector, real-time, Gaussian distribution function, personalized dataset
Abstract

Recognizing human activity in real time with a limited dataset is possible on a resource-constrained device. However, most classification algorithms such as Support Vector Machines, C4.5, and K Nearest Neighbor require a large dataset to accurately predict human activities. In this paper, we present a novel real-time human activity recognition model based on Gaussian Naïve Bayes (GNB) algorithm using a personalized JavaScript object notation dataset extracted from the publicly available Physical Activity Monitoring for Aging People dataset and University of Southern California Human Activity dataset. With the proposed method, the personalized JSON training dataset is extracted and compressed into a 12×8 multi-dimensional array of the time-domain features extracted using a signal magnitude vector and tilt angles from tri-axial accelerometer sensor data. The algorithm is implemented on the Android platform using the Cordova cross-platform framework with HTML5 and JavaScript. Leave-one-activity-out cross validation is implemented as a testTrainer() function, the results of which are presented using a confusion matrix. The testTrainer() function leaves category K as the testing subset and the remaining K-1 as the training dataset to validate the proposed GNB algorithm. The proposed model is inexpensive in terms of memory and computational power owing to the use of a compressed small training dataset. Each K category was repeated five times and the algorithm consistently produced the same result for each test. The result of the simulation using the tilted angle features shows overall precision, recall, F-measure, and accuracy rates of 90%, 99.6%, 94.18%, and 89.51% respectively, in comparison to rates of 36.9%, 75%, 42%, and 36.9% when the signal magnitude vector features were used. The results of the simulations confirmed and proved that when using the tilt angle dataset, the GNB algorithm is superior to Support Vector Machines, C4.5, and K Nearest Neighbor algorithms.

Cite this article as:
M. Gadebe, O. Kogeda, and S. Ojo, “Smartphone Naïve Bayes Human Activity Recognition Using Personalized Datasets,” J. Adv. Comput. Intell. Intell. Inform., Vol.24, No.5, pp. 685-702, 2020.
Data files:
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