Multi-Stroke Air-Writing Recognition Using Temporal-Spatial Interferometric MIMO Radar

This paper proposes a novel temporal-spatial inter-ferometric Multiple-Input Multiple-Output (MIMO) radar for tracking multi-stroke air-writing trajectories. Accurate trajectory tracking mandates the high-precision positioning of the target in both range and azimuth. To avoid high demands on the radar bandwidth and array aperture, we propose a temporal and spatial interferometry approach to estimate the range and azimuth displacements, respectively. Additionally, the elevation displacement is exploited to distinguish the alphanumerical trajectory from artifacts, which arises due to the continuous motion articulation in the air-writing. This is achieved by utilizing the subtle elevation change induced by hand lifts among different strokes. Experimental results validate the effectiveness of the proposed multi-stroke air-writing trajectory tracking using the temporal-spatial interferometric MIMO radar. The proposed method offers a promising solution to accurate and efficient multi-stroke air-writing recognition. Multi-stoke writing underlies many alphabets, specifically those of the Arabic Language.