% -*- texinfo -*-
% @deftypefn {Function File} {@var{b} = } bwborder (@var{im})
% Finds the borders of foreground objects in a binary image.
%
% @var{b} is the borders in the 0-1 matrix @var{im}. 4-neighborhood is considered.
%
% A pixel is on the border if it is set in @var{im}, and it has at least one
% neighbor that is not set.
% @end deftypefn