Radar-based Air-writing for Embedded Devices

Air-writing (AW) is an advanced type of gesture sensing (GS) that enables users to write in a 3D space by moving their hand or a marker. It involves writing characters, numerals, symbols, and words without any physical medium. Unlike hand gestures, which can be deliberately made to facilitate recognition, air-writing involves varying directions, speeds, and styles, making it more challenging to recognize. AW has been implemented using different types of sensors, and the systems can be categorized based on the sensor used.