Fermi filter

The Fermi filter is a common image processing filter that uses the Fermi–Dirac distribution in the frequency domain to perform a low-pass filter[1] or high-pass filter[2] similar to a Gaussian blur, but the harshness can be scaled.[3]

## References

1. ↑ "img.alg - Image Processing Algorithms: FermiLowPassFilter". https://openstructure.org/docs/2.2/img/alg/alg/#ost.img.alg.FermiLowPassFilter.
2. ↑ "img.alg - Image Processing Algorithms: FermiHighPassFilter". https://openstructure.org/docs/2.2/img/alg/alg/#ost.img.alg.FermiHighPassFilter.
3. ↑ "SPIDER: FQ NP (Filter - Quick Fourier, High, low pass, etc)". https://spider.wadsworth.org/spider_doc/spider/docs/man/fqnp.html.

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