# Cizmar noise

This operation adds noise to the diffraction pattern following the definition
of Cizmar et al. (2008) [1].
It consists of the combination of Poisson noise, representing the noise from
the electron interactions statistics; and Gaussian noise, attributed to the
camera’s electronics:

where is the original intensity of a pixel, the final
intensity, the standard deviation of Gaussian noise, *P* the
amplitude of Poisson noise and *Z* a random number normally distributed.

## Parameters

The user must defined the standard deviation of Gaussian noise ()
and the amplitude of Poisson noise (*P*).

Cizmar, P.,
Vlad\'ar, A.,
Ming, B.,
&
Postek, M.
(2008).
Simulated sem images for resolution measurement.
Scanning,
30,
381-391.