Fixing getrandom()

Posted Sep 30, 2019 12:49 UTC (Mon) by anton (subscriber, #25547)
In reply to: Fixing getrandom() by excors
Parent article: Fixing getrandom()

Thermal noise is relatively small compared to photon noise if the sensor receives significant photons, but may be enough for initializing the RNG. And of course you don't want to be have so much brightness and so much exposure that the sensor saturates, but you can recognize anything approaching saturation, and then use shorter exposure time, if too many pixels are saturated. Combining high gain with long exposure will give more thermal noise in darkness, but produce saturation if there is light.