% -*- texinfo -*-
% @deftypefn {Function File} {@var{BW2} = } erode (@var{BW1},@var{SE})
% @deftypefnx {Function File} {@var{BW2} = } erode (@var{BW1},@var{SE},@var{alg})
% @deftypefnx {Function File} {@var{BW2} = } erode (@var{BW1},@var{SE},...,@var{n})
% Perform an erosion morphological operation on a binary image.
%
% BW2 = erosion(BW1, SE) returns a binary image with the result of an erosion
% operation on @var{BW1} using neighbour mask @var{SE}.
%
% For each point in @var{BW1}, erode searchs its neighbours (which are
% defined by setting to 1 their in @var{SE}). If all neighbours
% are on (1), then pixel is set to 1. If any is off (0) then it is set to 0.
%
% Center of @var{SE} is calculated using floor((size(@var{SE})+1)/2).
%
% Pixels outside the image are considered to be 0.
%
% BW2 = erode(BW1, SE, alg) returns the result of a erosion operation
% using algorithm @var{alg}. Only 'spatial' is implemented at the moment.
%
% BW2 = erosion(BW1, SE, ..., n) returns the result of @var{n} erosion
% operations on @var{BW1}.
%
% @seealso{dilate}
% @end deftypefn