function M = perform_shape_smoothing(M,sigma)

% perform_shape_smoothing - perform morphological smoothing
%
% M = perform_shape_smoothing(M,sigma);
%
%   M is a binary shape (1 is assumed to the shape and 0 the background).
%   sigma is the width of the smoothing, in pixels.
%
%   Copyright (c) 2006 Gabriel Peyr