It can - try the raw_diag module.
There are a couple of methods:
- from OB areas (not reliable, just an extremely rough approximation, but works on any image)
- from one dark frame (includes both fixed and random components)
- from the difference of two dark frames (you'll get the random noise component * sqrt(2), assuming it's Gaussian)
-
from the difference of two regular images (so you can estimate the noise at various signal levels - enough information for plotting a SNR curve).
I have some trust in the last method, especially for DR measurements, as long as white level (clipping point) is autodetected well (
sometimes it isn't). However, fitting FWC and read noise from the SNR curve is probably an ill-conditioned problem - if you can suggest a better method, I'm all ears.