Ghost imaging with a SPAD array at low light intensities

Abstract

An approach to ghost imaging with a single photon avalanche diode (SPAD) array used simultaneously as a "bucket" detector and an imaging camera is described. The imaging is performed with the help of a pseudo-thermal light source where the light intensity is so low that the dark counts of SPAD have a noticeable effect on imaging. In the approach the data frames are filtered by the number of per-frame counts and the correlation images obtained for different "bucket" pixels are superposed. We demonstrate that the approach is capable to significantly improve image quality