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基于肌電信號層級分類的手部動作識別方法

A method of hand movement pattern recognition based on sEMG hierarchical classification

作者: 趙漫丹  李東旭  范才智  孟云鶴 
單位:                      國防科學(xué)技術(shù)大學(xué)航天科學(xué)與工程學(xué)院(長沙410073)        
關(guān)鍵詞:                     手部動作;表面肌電信號;層級分類;AR模型;人工神經(jīng)網(wǎng)絡(luò)          
分類號:
出版年·卷·期(頁碼):2014·33·5(490-496)
摘要:

目的 利用肌電信號對手部動作進(jìn)行識別,是控制現(xiàn)代康復(fù)假手的關(guān)鍵,其中使用少量電極識別出較多手勢又是一難點(diǎn)。為更加充分利用所獲得的肌電信息,本文提出一種層級分類方法。方法 首先提出一種基于層級分類的手部肌電信號動作識別方法,該方法首先根據(jù)被分類對象的多側(cè)面屬性,利用肌電積分值作為特征值,并通過線性判別函數(shù)實(shí)施預(yù)分類;其次建立肌電信號的自回歸模型,將模型系數(shù)作為特征值,將人工神經(jīng)網(wǎng)絡(luò)作為分類器進(jìn)行細(xì)分類;最后進(jìn)行了對比實(shí)驗(yàn)論證。結(jié)果 實(shí)驗(yàn)結(jié)果表明,可以利用2個表面肌電電極以較高的識別率識別出8個常用手部動作。結(jié)論 該方法能夠以較少的肌電電極識別出較多的動作,比未采用分層方法具有更好的分類效果。

Objective Recognization of hand movement patterns by using electromyography (EMG) signal is the key to controlling modern rehabilitation prosthetic hand. It can promote the common progress of biotechnology and mechatronics technology. To recognize more hand movement patterns by fewer electrodes is one of the difficulties. In order to make the best of EMG information, the article proposes a method of hierarchical classification. Methods Firstly, a method of recognizing the hand movement patterns based on hierarchical classification is proposed. The method utilizes the multiple characteristics of the classified objects. Integrate EMG is used for the feature value and the linear discriminant function actualizes presorting. Then, an autoregressive (AR) model is established and its parameters are used for the features. Artificial neural network can be used to classify finely. Finally, comparative experiments are carried out to verify. Results The experiments show that the eight common hand movements can be recognized effectively by two surface EMG electrodes. Conclusions The method indicates that the more movement patterns can be recognized by fewer electrodes and it performs better than the method without hierarchical classification.

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