Image processing filters can operate in spatial domain or frequency domain. High pass filter is an example filter that operates in the frequency domain. Fourier transform converts an image (or any signal) from spatial (or time) domain to frequency domain.

This tutorial explains the use of Fourier transform filtering for image processing by creating a mask and blocking certain frequency signals.

The code from this video is available at: https://github.com/bnsreenu/python_for_microscopists

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