Event-based Background-Oriented Schlieren.Schlieren imaging is an optical technique to observe the flow of transparent media, such as air or water, without any particle seeding. 
Event-based Background-Oriented Schlieren
Event cameras offer potential advantages (high dynamic range, high temporal resolution, and data efficiency) to overcome such limitations due to their bio-inspired sensing principle.  The experiments with accurately aligned frame- and event camera data reveal that the proposed method enables event cameras to obtain on par results with existing frame-based optical flow techniques. 
event cameras
The experiments with accurately aligned frame- and event camera data reveal that the proposed method enables event cameras to obtain on par results with existing frame-based optical flow techniques. 
frame-based optical flow techniques