I have been using a butter band pass filter for temporal signals using scipy this documentation https://scipy-cookbook.readthedocs.io/items/ButterworthBandpass.html and the answers in this topic How to implement band-pass Butterworth filter with Scipy.signal.butter.

How can I extend this to an array in python ? Instead of just applying this in the two directions, I'd like to use so king of radial symmetry ..

Additional question : How do I deal with the Nan values in an array like this one (nan in white): enter image description here

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