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## Copyright (C) 2000 Kai Habel
##
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 2 of the License, or
## (at your option) any later version.
##
## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this program; if not, write to the Free Software
## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
## -*- texinfo -*-
## @deftypefn {Function File} @var{bool}= isbw (@var{BW})
## returns true for a black-white (binary) image.
## All values must be either 0 or 1
## @end deftypefn
## Author: Kai Habel <kai.habel@gmx.de>
## Date: 20/03/2000
function bool = isbw (BW)
bool = 0;
if !(nargin == 1)
usage ("isbw(BW)");
endif
if !(is_matrix(BW))
return;
endif
bool = all (all ((BW == 1) + (BW == 0)));
endfunction