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ordfilter( [order=order,] x [[, axes],
width, /median, /minimum, /maximum])
Applies an order filter to dimensions axes of
x, over width elements. /median
selects a median filter, /minimum a minimum filter, and
/maximum a maximum filter. order selects a filter
that returns the element that has fraction order or less of
the inspected elements below it. If axes is not specified,
then the filter spans all dimensions of x. If
width is even then one is subtracted from it.
width defaults to 3. The filter is applied only to
those elements of x for which all elements to be considered
by the filter exist. For elements that are too close to the edge, the
original value is retained.