1## Copyright (C) 2007 Søren Hauberg <soren@hauberg.org> 2## Copyright (C) 2012-2014 Carnë Draug <carandraug+dev@gmail.com> 3## 4## This program is free software; you can redistribute it and/or modify it under 5## the terms of the GNU General Public License as published by the Free Software 6## Foundation; either version 3 of the License, or (at your option) any later 7## version. 8## 9## This program is distributed in the hope that it will be useful, but WITHOUT 10## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11## FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more 12## details. 13## 14## You should have received a copy of the GNU General Public License along with 15## this program; if not, see <http://www.gnu.org/licenses/>. 16 17## -*- texinfo -*- 18## @deftypefn {Function File} {} im2uint16 (@var{img}) 19## @deftypefnx {Function File} {} im2uint16 (@var{img}, "indexed") 20## Convert image to uint16. 21## 22## The conversion of @var{img} to a 16-bit unsigned integer, is dependent 23## on the type of input image. The following input classes are supported 24## for non-indexed images: 25## 26## @table @samp 27## @item int16 or uint8 28## Values are rescaled to the range of the uint16 class [0 65535]. 29## 30## @item logical 31## True and false values are assigned a value of 0 and 255 respectively. 32## 33## @item double or single 34## Values are truncated to the interval [0 1] and then rescaled to the range 35## of values of the int16 class [0 255]. 36## 37## @item uint16 38## Returns the same image. 39## 40## @end table 41## 42## If the second argument is the string @qcode{"indexed"}, then values are 43## cast to uint16, and a -1 offset is applied if input is 44## a floating point class. Input checking is performed and an error will 45## be throw is the range of values in uint16 is not enough for all the 46## image indices. 47## 48## @seealso{im2bw, imcast, im2uint8, im2double, im2int16, im2single} 49## @end deftypefn 50 51function imout = im2uint16 (im, varargin) 52 if (nargin < 1 || nargin > 2) 53 print_usage (); 54 elseif (nargin == 2 && ! strcmpi (varargin{1}, "indexed")) 55 error ("im2uint16: second input argument must be the string \"indexed\""); 56 endif 57 imout = imcast (im, "uint16", varargin{:}); 58endfunction 59 60%!assert (im2uint16 (uint16 ([1 2 3])), uint16 ([1 2 3])); 61%!assert (im2uint16 (uint8 ([0 127 128 255])), uint16 ([0 32639 32896 65535])); 62%!assert (im2uint16 ([0 0.5 1]), uint16 ([0 32768 65535])); 63%!assert (im2uint16 ([0 1/65535 1.4/65535 1.5/65535 1]), uint16 ([0 1 1 2 65535])); 64%!assert (im2uint16 ([1 2]), uint16 ([65535 65535])); 65%!assert (im2uint16 ([-1 0 0.5 1]), uint16 ([0 0 32768 65535])); 66%!assert (im2uint16 (int16 ([-32768 -1 0 32768])), uint16 ([0 32767 32768 65535])); 67%!assert (im2uint16 ([false true]), uint16 ([0 65535])); 68%!assert (im2uint16 ([true false]), uint16 ([65535 0])); 69 70%!assert (im2uint16 (uint8 ([3 25]), "indexed"), uint16 ([3 25])); 71%!assert (im2uint16 ([1 3 25], "indexed"), uint16 ([0 2 24])); 72 73%!error <indexed> im2uint16 ([0 1 2], "indexed"); 74%!error <indexed> im2uint16 (int16 ([17 8]), "indexed"); 75%!error <indexed> im2uint16 (int16 ([-7 8]), "indexed"); 76%!error <indexed> im2uint16 ([false true], "indexed"); 77%!error <range of values> im2uint16 (65537, "indexed"); 78 79