Four DoF gesture recognition with an event-based image sensor

An algorithm to recognize four degrees of freedom gesture by using event-based image sensor is developed. The gesture motion includes three translations and one rotation. Each pixel of the event-based image sensor produces an event when temporal intensity change is larger than a pre-defined value. From the time-stamps of the events, a map of pseudo optical flow is calculated. The proposed algorithm achieves the gesture recognition based on this optical flow. It provides not only directions but also magnitudes of velocity. The proposed algorithm is memory-wise and computationally efficient because it uses only a current time-stamp map and local computation. This advantage will facilitate applications for mobile devices or on-chip development.