Also known as dark current noise. Part of the noise due to thermally generated free electrons. It is currently considered that thermal noise doubles for an increase of 8° of the ambient temperature. This noise is particularly visible in low-light.dxoglossary
Pixel response non-uniformity. Noise due to the inhomogeneity of pixels properties on the sensor.
See Dark noise.
Random variations of the light perceived by the sensor due to the fact that photons are not emitted at a constant rate, but follow a random process (see Poisson process).