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Hmmm, not sure about this, it sounds like a free lunch.
I could take any of my subs and simply register them to some arbitrary half-way point between pixels and improve the subs SNRs? Unless the resampling loses resolution it cannot gain SNR, otherwise it gains information for free.
Of course resampling dithered subs destroys the correlated FPN, which reduces the noise hence increasing SNR, perhaps this is what you are seeing?
Regards,
EB
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