A Low Computational Cost Hand Waving Action Recognition System with Echo State Network for Home Service Robots

This study proposes a low computational cost hand-waving action recognition system for non-verbal communication in home service robots.The system is based on an echo state network, which requires lower computational costs than that of deep neural networks (DNNs), and processes time-series data of skeletal coordinates of humans to recognize hand-waving actions.Additionally, this study proposes and compares two types of Preprocessing ing methods of the skeletal coordinates to ensure the robustness of the human positions on the frame: one method extracts shoulder and arm angles, which are invariable regardless of the humans' positions and the other normalizes the skeletal coordinates.The experimental result shows that the proposed system has competitive accuracy and is robust to varying human positions.