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can someone explain me the following paragraph, i tried to understand it but i am not getting it exactly, Thank you !

Since you know the variance, you can predict the energy of the noise image, ∑xy|η(x,y)|2 ≈ ∑xyσ2η. Then use the facts that (i) ∑xy|η(x,y)|2∝ ∑uv|N(u,v)|2, and that (ii) for white noise, |N(u,v)| is approximately independent of u,v

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  • $\begingroup$ Is this from a particular source? Also, could you be more specific in the notations? Like what is $\eta$? The pixel row and column are $u$ and $v$ and then what is $N$? $\endgroup$ – Engineer Oct 17 at 20:01

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