/usr/share/octave/packages/image-2.2.0/imcomplement.m is in octave-image 2.2.0-3.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 | ## Copyright (C) 2008 Søren Hauberg <soren@hauberg.org>
##
## 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 3 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, see <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {Function File} @var{B} = imcomplement(@var{A})
## Computes the complement image. Intuitively this corresponds to the intensity
## of bright and dark regions being reversed.
##
## For binary images, the complement is computed as @code{!@var{A}}, for floating
## point images it is computed as @code{1 - @var{A}}, and for integer images as
## @code{intmax(class(@var{A})) - @var{A}}.
## @seealso{imadd, imdivide, imlincomb, immultiply, imsubtract}
## @end deftypefn
function B = imcomplement(A)
## Check input
if (nargin != 1)
error("imcomplement: not enough input arguments");
endif
if (!ismatrix(A))
error("imcomplement: input must be an array");
endif
## Take action depending on the class of A
if (isa(A, "double") || isa(A, "single"))
B = 1 - A;
elseif (islogical(A))
B = !A;
elseif (isinteger(A))
B = intmax(class(A)) - A;
else
error("imcomplement: unsupported input class: '%s'", class(A));
endif
endfunction
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