Mercurial > octave-nkf
view scripts/image/ntsc2rgb.m @ 14260:1f911333ed3d
doc: Update docstrings for functions in image/ directory
* aspell-octave.en.pws, brighten.m, colormap.m, contrast.m, flag.m, gmap40.m
gray.m, gray2ind.m, hsv2rgb.m, image.m, ind2gray.m, ind2rgb.m, ntsc2rgb.m,
ocean.m, rgb2hsv.m, rgb2ind.m, rgb2ntsc.m: Update docstrings.
author | Rik <octave@nomad.inbox5.com> |
---|---|
date | Tue, 24 Jan 2012 09:51:48 -0800 |
parents | 72c96de7a403 |
children | 806ea52af230 |
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## Copyright (C) 1994-2012 John W. Eaton ## ## 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/>. ## -*- texinfo -*- ## @deftypefn {Function File} {@var{rgb_map} =} ntsc2rgb (@var{yiq_map}) ## @deftypefnx {Function File} {@var{rgb_img} =} ntsc2rgb (@var{yiq_img}) ## Transform a colormap or image from luminance-chrominance (NTSC) space to ## red-green-blue (RGB) space. ## @seealso{rgb2ntsc, hsv2rgb, ind2rgb} ## @end deftypefn ## Author: Tony Richardson <arichard@stark.cc.oh.us> ## Created: July 1994 ## Adapted-By: jwe function rgb = ntsc2rgb (yiq) if (nargin != 1) print_usage (); endif ## If we have an image convert it into a color map. if (ismatrix (yiq) && ndims (yiq) == 3) is_image = true; Sz = size (yiq); yiq = [yiq(:,:,1)(:), yiq(:,:,2)(:), yiq(:,:,3)(:)]; ## Convert to a double image. if (isinteger (yiq)) C = class (yiq); low = double (intmin (C)); high = double (intmax (C)); yiq = (double (yiq) - low) / (high - low); endif else is_image = false; endif if (! ismatrix (yiq) || columns (yiq) != 3) error ("ntsc2rgb: argument must be a matrix of size Nx3 or NxMx3"); endif ## Convert data trans = [ 1.0, 1.0, 1.0; 0.95617, -0.27269, -1.10374; 0.62143, -0.64681, 1.70062 ]; rgb = yiq * trans; ## If input was an image, convert it back into one. if (is_image) rgb = reshape (rgb, Sz); endif endfunction