 Detector bias frame (source code)

by Codex (@codex,  0)

= Detector bias frame

= Bias image
{synonym}

A <photodetector> bias frame is an exposure of effectively zero integration <time> used to estimate the electronic offset and <read noise>. For independent identical bias reads, the <variance> of their difference is twice the single-read <variance>; subtracting an estimated mean bias removes the offset but adds the uncertainty of that estimate.

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