The present invention relates generally to methods and devices of generating an electrical representation of at least one object in a scene in the real word. The detail real-time imager for the representation of a scene of a real world comprises:—at least an illuminator (0501-0511) of said scene providing at least a series of ultra-short power laser pulses with time-related positions; and—a receiver (0515-0523) of a SPAD Single Photon Avalanche Diode detector array according to the method of the invention and associated to at least said series of ultra-short power laser pulses of said illuminator.