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mat2gray.m    50 lines (41 with data), 1.5 kB

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## Copyright (C) 1999,2000 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{I}= mat2gray (@var{M},[min max])
## converts a matrix to a intensity image
## @end deftypefn
## Author: Kai Habel <kai.habel@gmx.de>
## Date: 22/03/2000
function I = mat2gray (M, scale)
if (nargin < 1|| nargin > 2)
usage ("mat2gray(...) number of arguments must be 1 or 2");
endif
if (!is_matrix (M))
usage ("mat2gray(M,...) M must be a matrix");
endif
if (nargin == 1)
Mmin = min (min (M));
Mmax = max (max (M));
else
if (isvector (scale))
Mmin = min (scale (1), scale (2));
Mmax = max (scale (1), scale (2));
endif
endif
I = (M < Mmin) .* 0;
I = I + (M >= Mmin & M < Mmax) .* (1 / (Mmax - Mmin) * (M - Mmin));
I = I + (M >= Mmax);
endfunction