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Its interesting that random noise is the reason for duplication. And this concept does ring bells for me from my uni days studying signal processing. I just thought perhaps that if maybe you could filter out the noise and create a second artifical exposure and then Add it. Or use a Algorithim to add that does this automatically wheryby it "intelgently" recognisises signal from noise and removes it to create an artifical 2nd, 3rd and fourth exposure. Or perhaps use one Dark frame to get some "data" on the noise and what it "looks" like to then intelgently filter the frame of it.
So if that were possible then the Signal/Noise would be diffrent in the 2nd, and consecutive frames theyrby hopefully bosting the Signal strength over the process. I wonder if similar techniques are not employed in Radio Telescope work to fitler noise and boost signal. And what about something like a software Differential amplifier, that rejects noise and boosts the common signal, but i suppose thats what happpens when you take two frames.
So perhaps 2 good frames would be enough to isolate noise from signal by examining the common signal features that should not be random idealy. Like using those Noise buster headphones.
Sorry for the post in this fashion, i am writing as i think.
Regards
Fahim
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