Pattern Recognition of Torso Movements

The research objective is to develop a real-time intent recognition system for intelligent, powered backbone exoskeleton to distinguish between the intent activities modes of subject, such as flexion, extension and twisting motions. Current exoskeleton devices predominantly utilize muscle activity signals (surface electromyography – sEMG) from the user’s body, in addition to pressure and force sensors, mounted at various locations on the device and along the body. To identify a suitable sensor set to recognize user intent this work focuses on developing an approach based on sEMG and uses inertial measurements to classify the training data. Methods compared include decision trees, linear discriminant analysis, neural networks, state-vector machines, and wavelet transforms. It has been found that the sEMG signals from the user’s body correspond to a local, area specific level, and play the most important role in pattern classification, while inertial measurements correspond to a more holistic and generalized way of intent recognition.


A. Kadrolkar and F.C. Sup IV, “Intent Recognition of Torso Motion Using Wavelet Transform Feature Extraction and Linear Discriminant Analysis Ensemble Classification”, Biomedical Signal Processing and Control, vol. 38, pp. 250-264, 2017.

Z. Zhang and F. Sup, “Activity Recognition of the Torso based on Surface Electromyography and Inertial Measurement Units for Exoskeleton Control”, Biomedical Signal Processing and Control, vol. 10, pp. 281-8, 2014.

A. Kadrolkar and F. Sup, “Classification of Trunk Motion for a Backbone Exoskeleton using Inertial Data and Surface Electromyography,” IEEE Int. Conf. on Systems, Man, and Cybernetics, pp. 3978-3983, 2013.