Abstract: A method for measuring attributes of a particle in motion comprises observing a region of interest with an event-based sensor oriented such that lines of a pixel array lie across an expected trajectory of the particle through the region of interest; defining two reference lines of pixels separated by a spatial distance; sampling first and second groups of events produced by the reference lines; determining a temporal distance between the groups of events; and calculating a longitudinal speed factor of the particle based on the spatial distance and temporal distance. The method further comprises analyzing one of the groups of events over multiple time steps to produce an outline of the particle in space-time coordinates including spatial components based on positions of event-triggered pixels and temporal components based on time steps; and converting the space-time coordinates to spatial coordinates by multiplying the time steps by the longitudinal speed factor.

Abstract: A method for measuring attributes of a particle in motion comprises observing a region of interest with an event-based sensor oriented such that lines of a pixel array of the sensor lie across an expected trajectory of the particle (P) through the region of interest; defining two reference lines of pixels (R1, R2) separated by a spatial distance (D); sampling a first group of events produced by a first of the two reference lines; sampling a second group of events produced by the second of the two reference lines; determining a temporal distance (T) between the second and first groups of events; and providing a longitudinal speed factor (vy) of the particle based on the spatial distance and the temporal distance.