EMG-based estimation of shoulder kinematic using neural network and quadratic discriminant analysis

Armin Ehrampoosh, Aghil Yousefi-Koma, Seyed Saied Mohtasebi, Moosa Ayati

Research output: Chapter in Book/Report/Conference proceedingConference PaperOther

1 Citation (Scopus)


This paper proposes a two phase strategy in myoelectric control of upper limb which benefits from strength of two common myoelectric interface methods. The aim of this research is to create a mapping between electrical activities of muscles known as electromyogram (EMG) signals and kinematics of corresponding joint. Activations of main muscles responsible for 3 DOFs of shoulder were recorded. According to anatomical surveys, 4 classes of motion are defined in shoulder joint. First phase concerns with motion classification by quadratic discriminant analysis (QDA). In fact, classifier plays the role of high level controller that decides between several networks to estimate corresponding motion class angle. Also, majority voting (MV) is used as post processing algorithm to improve classification results. The second phase concerns with continuous angle estimation of different motion classes in shoulder joint. Four different time-delayed artificial neural networks (TDANN) were trained using data of corresponding motion class. Classification results indicated relative superiority of QDA over Linear Discriminant Analysis (LDA) to achieve higher overall accuracy of 98.3% against 93.7%. Also, TDANN estimation showed the capability of this model to predict shoulder joint angles, with high accuracy.

Original languageEnglish
Title of host publication4th RSI International Conference on Robotics and Mechatronics, ICRoM 2016
PublisherIEEE, Institute of Electrical and Electronics Engineers
Number of pages6
ISBN (Electronic)9781509032228
Publication statusPublished - 2017
Externally publishedYes
EventRSI International Conference on Robotics and Mechatronics 2016 - University of Tehran, Tehran, Iran
Duration: 26 Oct 201628 Oct 2016
Conference number: 4th


ConferenceRSI International Conference on Robotics and Mechatronics 2016
Abbreviated titleICRoM 2016


  • Linear Discriminant Analysis
  • Myoelectric Control
  • Quadratic Discriminant Analysis
  • Time Delayed Artificial Neural Network

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