f-number equivalent between m43 and FF

Started Mar 25, 2014 | Discussions thread
dwalby Veteran Member • Posts: 5,648
Re: SNAP! Where it is?

crames wrote:

Upsampled noise looks noisier, not due to any change in the standard deviation but due to the way magnification shifts the visible frequencies in the noise to more sensitive regions of the eye's contrast sensitivity function.

By upsampling don't you create a condition where the noise in adjacent pixels is no longer uncorrelated?  When you bin a block of pixels you only achieve the sqrt(N) SNR improvement if the noise is uncorrelated over all the samples.  Depending on the magnitude of the cross-correlation components of the noise you lose some or all of that processing advantage.

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