Using Metz Filter in image processing

I want to impalement of Metz filter to the image.
Metz filter is defined as
The 1-dimensional Metz restoration filter in the frequency domain is defined as :
𝐌(𝐟) = (1 −(1 − ([𝐆(𝐟)]^2))^𝐍+1)∕(𝐆(𝐟))
Where 𝑁 is the Metz power, 𝑓 is the zero-mean Gaussian density function, 𝐺(𝑓) its transfer function (𝐺(0) defined as 1).

[https://doi.org/10.1016/j.nima.2019.05.083]

I’m beginner in image processing.
How to write a python script for this filter.
I also need to calculate the MTF for input image but I don’t know how to solve it.
I need your recommendation.
Thanks in advance