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minfilter(x [[, axes], widths])
Applies a minimum filter to one or more dimensions axes of
x, over widths elements. If axes
is not specified, then x is treated as a 1d array.
widths must be a scalar or an array with the same number of
elements as widths and must contain only positive numbers.
widths defaults to scalar 3. For elements too close
to the edge to yield full-width results, the nearest full-width result
is returned.
ordfilter(/minimum) yields the same results as
minfilter(), but is much slower.
See also: maxfilter, ordfilter, medfilter