Remove / fill outliers from 3D matrix from structured grid or scattered data

Hi,

I wanted to perform the following task:

- remove (and fill) outliers in a 3D matrix of data. The grid could be structured or a cloud of scattered points. Ideally, would be useful to have a smaller volume which serves as a sliding window, since some values are outliers in a region but not in the other.

I noticed the following function exist :

https://ch.mathworks.com/matlabcentral/fileexchange/3961-deleteoutliers

https://ch.mathworks.com/help/matlab/ref/rmoutliers.html

https://ch.mathworks.com/help/matlab/ref/filloutliers.html

which are good for 1D, or 2D data.

A possible way would be to obtain data for every small volume (sliding window), convert in 1D/2D, remove the outliers with one of the previously mentioned methods, and then continue with the next window.

This would be computationally expensive for my case.

I wonder whether there is another way/function to perform this task?

Thank you in advance