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In image processing, up to which value of mean and variance can a Wiener filter be used to denoise the image?

Wiener filtering can be used when variance of the noisy image is low, but I don't know the specific values of variance and mean.

What are limitations of the Wiener filter?

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    $\begingroup$ Why do you think it can't be used after a certain value? The Wiener filter minimizes the mean square error, regardless of the noise level. Whether there is a point at which the noise degradation makes linear filtering a poor choice for processing (in terms of image quality improvement) is another question. $\endgroup$ – Peter K. Sep 24 '13 at 18:11

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