more pixels are better!

Started Dec 14, 2008 | Discussions thread
ejmartin Veteran Member • Posts: 6,274
Re: Are those figures for "print" or "screen"? (nt)

Les Olson wrote:

I disagree. For any quantity the correct approach is to compare
first the actual value. Adjusted, normalised, or standardised values
can be compared IF they serve a purpose, and it does not matter
whether you are talking about "seasonally adjusted unemployment" or
normalised SNR. The trap, as in this case, is to use normalisations
that encode ideas about the right answer.

Except that comparing values of a quantity X that depends on another quantity Y at two different values of Y is quite silly, unless one knows (as is the case here) how to translate a measured value X(Y1) into its value X(Y2) for the purpose of comparing to another measurement of the X at Y2.

Furthermore, it is not as though the noise at a fixed scale cannot be measured. It is merely that it is more convenient to measure the noise at the pixel level and use well established properties of pixel noise to infer its value at any other scale.

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