Perform a median filter on an N-dimensional array.
Apply a median filter to the input array using a local window-size
given by kernel_size.
Parameters :
volume : array_like
An N-dimensional input array.
kernel_size : array_like, optional
A scalar or an N-length list giving the size of the median filter
window in each dimension. Elements of kernel_size should be odd.
If kernel_size is a scalar, then this scalar is used as the size in
each dimension. Default size is 3 for each dimension.
Returns :
out : ndarray
An array the same size as input containing the median filtered
result.