Mean,median filter

Hello! I want to apply the mean filter only for a mask region of the image for Sentinel 1. Is it possible that the size/shape of the mean filter to have exactly the shape of the mask? Thank you!

could you please illustrate this with a screenshot?
Usually, filters have squared kernel sizes, so I’m not quite clear about what you mean by shape.

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I would like to compute the mean of the elements from this mask. I don’t know if this is possible in SNAP

You can use the statistic dialog and use the mask there which is automatically created for the polygon.