Exact(8)
A comprehensive noise model about digital camera which is a main component of SHWFS is constructed, including the readout noise, the photon shot noise, the quantization noise and the response un-uniformity.
Photon shot noise that is dominant for higher signal values is proportional to the square root of the signal amplitude and when the whole image signal is shifted down by the AB control, parts of the signal with higher noise values are shifted to the lower luminance values where lower noise amplitudes, are expected.
The role of photon shot noise depends on the light level.
Camera readout noise and photon shot noise were smaller than either of the above noise sources.
This becomes particularly obvious when assessing the impact of photon shot noise on the reliability of the photoreceptor responses.
This sensitivity difference results in dramatically different conclusions about the importance of photon shot noise for photoreceptor coding performance.
On the other hand, when photon shot noise dominates, Neher and Neher demonstrated that increasing the number of channels resulted in very little improvement of unmixing efficiency [28].
Photon shot noise reflects the physical limitation on accuracy of a visual system resulting from the random emission of photons from a light source.
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