基于核主成分分析的相关向量机人体动作分类新型模型

doi:10.3969/j.issn.0258-8021.2022.06.001

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Abstract In order to effectively improve the generalization ability in human activity classification task based on small sample data size, a novel human activity classification model was constructed by using the hybrid technique of kernel principal component (KPCA), and relevance vector machine (RVM) was proposed in this paper. The proposed technique was able to take the advantage of kernel function for the combination of KPCA with RVM, that is, the nonlinear gait features containing more human activity discriminative information hidden in the transformed higher dimensional feature space could be exploited by KPCA, which greatly contributed to solve the sparse probability distribution of human activity discrimination by Bayesian learning algorithm in RVM. This significantly improved the generalization performance of human activity classification. A public UCI human activity recognition (HAR) dataset with wearable sensor data from a smartphone was selected to evaluate the feasibility of our proposed model. In the experiment, all 10 299 of sample data were obtained from the collected data including a total of 30 subjects with six different human activity patterns. The cross-validation with 10 times was used to train and test the model. The experimental results showed that our proposed model could reach the best accuracy of 96% when ten relevance vectors were available, which were 5.4% and 3.6% more than KPCA-SVM and CNN-LSTM deep learning model, respectively. This suggested that our model had a superior ability to extract more nonlinear features associated with human activity change and to learn the sparse probability distribution of RVM. In conclusion, the proposed technique could accurately detect a certain human activity pattern based on the small sample size, which would provide a new idea and approach to exactly identify human activity.

Key words： human activity classification kernel principal component analysis relevance vector machine

Received: 22 October 2021

PACS:

R318

Corresponding Authors: ^*Email: jianningwu@fjnu.edu.cn

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	Wu Jianning
	Lin Qiuting
	Wu Bin

Cite this article:

Wu Jianning,Lin Qiuting,Wu Bin. A Novel KPCA-Based RVM Model for Human Activity Classification[J]. Chinese Journal of Biomedical Engineering, 2022, 41(6): 641-649.

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http://cjbme.csbme.org/EN/10.3969/j.issn.0258-8021.2022.06.001 OR http://cjbme.csbme.org/EN/Y2022/V41/I6/641

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