In both cases you'd need to know some properties of the distribution to get a random bitstream.
Which pixel would you be looking at?
Below what threshold would you call it a 0 rather than 1?
How long till you can confidently say next reading will be uncorrelated?
I don't know how the astronomical imaging solved these (and TBH cosmic ray scanning seems a bit overkill to me too).
USB webcams get hit by cosmic rays, too. This paper is interesting because it's not just looking at the low bits of a normal image, but rather at at exceptional events. It's a different sort of random.
Which pixel would you be looking at? Below what threshold would you call it a 0 rather than 1? How long till you can confidently say next reading will be uncorrelated?
I don't know how the astronomical imaging solved these (and TBH cosmic ray scanning seems a bit overkill to me too).