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im2bw.m    51 lines (44 with data), 1.6 kB

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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{BW}= im2bw (@var{I},threshold)
## @deftypefnx {Function File} @var{BW}= im2bw (@var{X},@var{cmap},threshold)
## converts image data types to a black-white (binary) image.
## The treshold value should be in the range [0,1].
## @end deftypefn
## Author: Kai Habel <kai.habel@gmx.de>
## Date: 19. March 2000
function BW = im2bw (img, a, b)
if ( nargin < 2 || nargin > 3)
usage("im2bw(I) number of arguments must be 2 or 3");
endif
if (isgray (img))
if (is_scalar (a))
BW = (img >= a);
else
error ("threshold value must be scalar");
endif
elseif (isind (img))
if (is_matrix (a) && columns (a) == 3)
if (is_scalar (b))
I = ind2gray (img, a);
BW = (I >= b);
endif
endif
else
error ("image matrix must be of index or intensity type");
endif
endfunction