``Median'' - a median filter

VFX name:

iMedian

IMPROMPTU Equivalent:

Median

purpose:

Apply a median filter to an input volume [24]; i.e., for each voxel, assign the median value of voxels within an prespecified window size to the voxel. This nonlinear filter is good for reducing salt-and-pepper noise (speckly noise). Also, it (tries to) preserves edges, while acting much like a lowpass filter.

input:

An 8-bit volume.

output:

An 8-bit volume.

parameters:

Default parameters menu is

x_filter_dimension = 3
y_filter_dimension = 3
z_filter_dimension = 3
iterations = 1

comments:

1.

While the median filter is popular, a few of the other filters can provide better performance (the maximum-homogeneity, sigma, symmetric nearest-neighbor).

2.

This function is slow. The computation time goes up as the size of the window.

3.

While the median filter is popular, a few of the other filters can provide better performance (the maximum-homogeneity, sigma, symmetric nearest-neighbor).