rTsfNet: a DNN model with Multi-head 3D Rotation and Time Series Feature Extraction for IMU-based Human Activity Recognition

This paper proposes rTsfNet, a DNN model with Multi-head 3D Rotation and Time Series Feature Extraction, as a new DNN model for IMU-based human activity recognition (HAR). rTsfNet automatically selects 3D bases from which features should be derived by deriving 3D rotation parameters within the DNN. Then, time series features (TSFs), the wisdom of many researchers, are derived and realize HAR using MLP. Although a model that does not use CNN, it achieved the highest accuracy than existing models under well-managed benchmark conditions and multiple datasets: UCI HAR, PAMAP2, Daphnet, and OPPORTUNITY, which target different activities.