Quote:
Originally Posted by gregbradley
I might be talking about a different thing as I am not sure how this super bias is calculated (is this the same thing as overscan bias?) but if it is overscan bias then that is only going to give a gain on a camera that has significant bias drift.
Some cameras where the electronics are not up to scratch and the bias values can drift over time.
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As the guys have said, Superbias is a PI process that reduces the noise in a master bias. It uses multiscale NR and the knowledge that there are typically column (or row) based structures in bias data.
I've never quite managed to think through how a superbias master would interact with overscan calibration. I guess I should try it. I normally take a lot of bias frames (why not, it's quick & easy?) so my master bias is very low noise anyway.