Quote:
Originally Posted by Shiraz
so you are just using flats to correct for illumination variability - not FPN? If you are not trying to reduce pixel-level fixed pattern noise, have you considered (or tried) noise filtering on the flats?
|
When I first used the 694 in CCDsoft the first thing that was obvious was FPN. I could see some manufacturing cut marks in some shots (short focus shots) and also a grid like flyscreen so the chip definitely has FPN.
But I like the idea of using PI to correct you mentioned. The idea of noise filtering on the flats I have not heard before and it'd be worth trying as is Martin's approach of multiple level flats and average combine them.
What tool did you use in PI to correct the uneven illumination?
Perhaps a test of the various methods with photos posted showing the results could be useful.
Greg.