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JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE)
Computer Technology, Electronic Communications Technologies     
Locomotion-Mode recognition using multiple kernel relevance vector machine
LIU Lei, YANG Peng, LIU Zuo-jun
1. School of Building Environmental Engineering, Zhengzhou College of Light Industry, Zhengzhou 450002, China;
2. School of Control Science and Engineering, Hebei University of Technology, Tianjin 300130, China;
3. Engineering Research Center of Intelligent Rehabilitation and Detecting Technology, Tianjin 300130, China
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Abstract  
A Locomotion-Mode recognition method based on multiple kernel relevance vector machine (MKRVM) was proposed to improve recognition accuracy, which selected the surface electromyography (SEMG), hip joint angle and knee joint angle as the major information source of recognition according to the user’s locomotion modes characteristics. SEMG features and joint angle features were fused into a feature vector as the input of multiple kernel relevance vector machine learning model, and different kernel functions were chosen for each signal through experiment. Glowworm swarm optimization algorithm was used to optimize kernel function parameters. The output was the probability of each locomotion mode for this sample. New sample can be classified using the trained model, and the recognition result is the mode with the highest probability. Experiment results show that the average recognition accuracy of locomotion-modes, including level-ground walking, stairs ascent, stairs descent, upslope and downgrade, is 94.64%, which is superior to SVM method using single kernel function.


Published: 01 March 2017
CLC:  TP 391  
Cite this article:

LIU Lei, YANG Peng, LIU Zuo-jun. Locomotion-Mode recognition using multiple kernel relevance vector machine. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2017, 51(3): 562-571.


采用多核相关向量机的人体步态识别

为进一步提升人体步态识别的准确率,参考人体步态特点,选择下肢表面肌电信号(SEMG)、髋关节角度、膝关节角度作为步态识别信息源,提出一种基于多核相关向量机(MKRVM)的人体步态识别方法.该方法以多源信息特征值作为多核相关向量机的输入,通过实验对不同信号选取合适的核函数,利用萤火虫优化(GSO)算法确定核函数参数,输出为不同步态的概率.利用训练好的模型直接对新样本进行分类,将概率最高的步态模式作为识别结果.实验结果表明,该方法对于平地行走、上楼、下楼、上坡、下坡等步态的平均识别率为94.64%,优于单核支持向量机(SVM)等方法.

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