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`erode(`

`image` [, /zeroedge])

Returns a copy of the two-dimensional numerical array

which is eroded using a 3 by 3 square mask. Only the properties "equal
to zero" and "unequal to zero" of the data values are regarded. If any
of the nine data elements centered on the element of interest are equal
to zero, then a 0 is returned for the element of interest, and a 1
otherwise. On the one-element-wide edges a 1 is returned if the element
of interest is unequal to zero, or a 0 otherwise, except if
`image``/zeroedge`

is specified, in which case the edges are always set to
zero.

See also: dilate