“…However, in the conditions of low-light and all kinds of noise interference, signal to noise ratio of the image signal obtained by the EMCCD imaging system falls with the decline in the image brightness and contrast, and the image resolution has been significantly affected. At present, research about the charge multiplication mechanism, noise characteristics and the imaging circuit model of the EMCCD has made significant achievements [5], [6], [7]. But the noise distribution model of the EMCCD has not been mentioned in literature by far.…”