Quote:
Originally Posted by RickS
Signal is what's in the pixels, Dunk  Take a look at the SubframeSelector script. It calculates a SNRWeight which gives you an idea of the quality of each sub wrt SNR. PI can only estimate noise, not measure it, so it's not perfectly accurate. High SNRWeight isn't always a good thing either. Light pollution reflected off a dirty big cloud will produce a high SNRWeight, and that's why we blink subs as well as measure them.
Don't forget that there's no such thing as a single SNR number for a sub. The SNR will be higher in bright areas and lower in dim areas due to the impact of shot noise. |
Cheers Rick, yeah I get that the signal is the precious pixel values
I'm assuming the noise estimation is based on the whole sub, and I roll with the premise that it's going to be more or less (within a margin of error) equally inaccurate for all the subs I collect.
Will take a look at SNRweight, I already use Subframe selector, for better or worse...