Readout Noise

Readout noise, dark current, shot noise, and SNR analysis for image sensors.

Model: Textbook approximation

Dark electrons = 0.001 e⁻

Noise floor √(σ²read + dark) = 10.00 e⁻

Read-noise-limited signal = 100 e⁻ (shot = read noise)

Model and references

Textbook approximation. A standard approximation from the literature (for example paraxial, plane-wave or Gaussian-beam), valid within the range the page states. About the tiers

Quadrature sum of Poisson signal and dark shot noise and a constant read noise. Fixed-pattern noise and gain are left out.

  1. Janesick J. R. (2007). Photon Transfer. SPIE Press. Read-noise, shot-noise and dark-noise regimes; total noise as the quadrature sum. doi:10.1117/3.725073
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