Quote:
Originally Posted by Peter Ward
Yes, agreed, but CCD's in reality have all sorts of noise sources, and these simply can't be ignored. e.g.
Dark current
Dark Current non uniformity
Dark current spikes
Spurious Charge
Transfer noise
Residual surface image
Residual bulk image
Cosmic rays
Cosmetic defects
Blem Spill
ADC Quantizing noise
EM interference.
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Actually, you can ignore many of them when comparing a sequence of short subs with a long sub of equivalent length because they have exactly the same effect in both cases. Many of these items aren't even noise, but sources of unwanted signal... the difference is significant. But there's little point in discussing further if you think that physics and mathematics aren't up to the task of modelling a sensor enough to derive useful imaging parameters.
Cheers,
Rick.