Mercurial > octave-nkf
view scripts/image/private/colorspace_conversion_input_check.m @ 20614:10ec79b47808
use new string_value method to handle value extraction errors
* __voronoi__.cc, chol.cc, colamd.cc, fftw.cc:
Use new string_value method.
author | John W. Eaton <jwe@octave.org> |
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date | Thu, 08 Oct 2015 18:15:56 -0400 |
parents | 131ce8cfaa80 |
children |
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## Copyright (C) 2015 Carnë Draug <carandraug+dev@gmail.com> ## ## This file is part of Octave. ## ## Octave 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. ## ## Octave 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 Octave; see the file COPYING. If not, see ## <http://www.gnu.org/licenses/>. ## Private function the functions that convert between color spaces, i.e., ## rgb2ntsc, rgb2hsv, hsv2rgb, and ntsc2rgb. All of these functions need to ## handle input in the same way. The returned flags are meant to be handled ## by the complementary private function colorspace_conversion_revert() function [in_arg, cls, sz, is_im, is_nd, is_int] ... = colorspace_conversion_input_check (func, arg_name, in_arg) cls = class (in_arg); sz = size (in_arg); ## If we have an image convert it into a color map. if (! iscolormap (in_arg)) if (! any (strcmp (cls, {"uint8", "uint16", "single", "double"}))) error ("%s: %s of invalid data type '%s'", func, arg_name, cls); elseif (size (in_arg, 3) != 3) error ("%s: %s must be a colormap or %s image", func, arg_name, arg_name); elseif (! isreal (in_arg) || ! isnumeric (in_arg)) error ("%s: %s must be numeric and real", func, arg_name); endif is_im = true; ## For floating point values, R, G and B should be in the [0 1] range, ## otherwise they don't make any sense. We accept those values ## anyways because we must return something for Matlab compatibility. ## User case is when a function returns an RGB image just slightly outside ## the range due to floating point rounding errors. ## Allow for ND images, i.e., multiple images on the 4th dimension. nd = ndims (in_arg); if (nd == 3) is_nd = false; elseif (nd == 4) is_nd = true; in_arg = permute (in_arg, [1 2 4 3]); elseif (nd > 4) error ("%s: invalid %s with more than 4 dimensions", func, arg_name); endif in_arg = reshape (in_arg, [numel(in_arg)/3 3]); else is_im = false; is_nd = false; endif ## Convert to floating point (remember to leave class single alone) if (isinteger (in_arg)) in_arg = double (in_arg) / double (intmin (cls)); is_int = true; else is_int = false; endif endfunction