Talk:Signal-to-noise ratio (imaging)

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and have exactly the same formula, thus yielding a zero signal; if that is not corrected it must be removed.Fgnievinski (talk) 01:20, 28 March 2010 (UTC)

I think they're meant to be taken over different regions (see the figure), but it's not at all clear from the text. I'm still trying to untangle what it says! GyroMagician (talk) 16:11, 28 March 2010 (UTC)
Oh, now I see! I agree with your interpretation. The current explanation is rather sloppy, IMHO. I'll fix that later. Fgnievinski (talk) 04:33, 29 March 2010 (UTC)

RMS noise is described as "the square root of the absolute value of the sum of variances" but the absolute value does not appear in the following formula, either as or as . —Preceding unsigned comment added by (talk) 01:24, 10 March 2011 (UTC)