Low photon count imaging

Abstract

Under low brightness conditions the digital detector registers a small number of photons, i.e. the image contains a small number of active pixels. The paper analyzes the distribution of active and empty pixels of digital detectors under poor uniform illumination. Results of experiments on registration of uniform X-ray radiation by a digital CCD camera are presented. It is shown that registration of individual photons has a local pattern in the form of peaks varying in symmetry and size