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annotate scripts/image/ntsc2rgb.m @ 20614:10ec79b47808

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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>
date Thu, 08 Oct 2015 18:15:56 -0400
parents 131ce8cfaa80
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 ## Copyright (C) 1994-2015 John W. Eaton
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2 ##
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3 ## This file is part of Octave.
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4 ##
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5 ## Octave is free software; you can redistribute it and/or modify it
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6 ## under the terms of the GNU General Public License as published by
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7 ## the Free Software Foundation; either version 3 of the License, or (at
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8 ## your option) any later version.
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9 ##
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10 ## Octave is distributed in the hope that it will be useful, but
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 ## General Public License for more details.
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14 ##
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15 ## You should have received a copy of the GNU General Public License
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16 ## along with Octave; see the file COPYING. If not, see
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17 ## <http://www.gnu.org/licenses/>.
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18
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19 ## -*- texinfo -*-
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20 ## @deftypefn {Function File} {@var{rgb_map} =} ntsc2rgb (@var{yiq_map})
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21 ## @deftypefnx {Function File} {@var{rgb_img} =} ntsc2rgb (@var{yiq_img})
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22 ## Transform a colormap or image from luminance-chrominance (NTSC) space to
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23 ## red-green-blue (RGB) color space.
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24 ##
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25 ## Implementation Note:
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26 ## The conversion matrix is chosen to be the inverse of the matrix used for
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27 ## rgb2ntsc such that
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28 ##
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29 ## @example
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30 ## x == ntsc2rgb (rgb2ntsc (x))
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31 ## @end example
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32 ##
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33 ## @sc{matlab} uses a slightly different matrix where rounding means the
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34 ## equality above does not hold.
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35 ## @seealso{rgb2ntsc, hsv2rgb, ind2rgb}
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36 ## @end deftypefn
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38 ## Author: Tony Richardson <arichard@stark.cc.oh.us>
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39 ## Created: July 1994
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40 ## Adapted-By: jwe
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41
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42 function rgb = ntsc2rgb (yiq)
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44 if (nargin != 1)
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45 print_usage ();
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46 endif
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47
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48 [yiq, cls, sz, is_im, is_nd, is_int] ...
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49 = colorspace_conversion_input_check ("ntsc2rgb", "YIQ", yiq);
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50
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51 ## Conversion matrix constructed from 'inv (rgb2ntsc matrix)'.
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52 ## See programming notes in rgb2ntsc.m. Note: Matlab matrix for inverse
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53 ## is slightly different. We prefer this matrix so that
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54 ## x == ntsc2rgb (rgb2ntsc (x)) rather than maintaining strict compatibility
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55 ## with Matlab.
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56 trans = [ 1.0, 1.0, 1.0;
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57 0.95617, -0.27269, -1.10374;
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58 0.62143, -0.64681, 1.70062 ];
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59 rgb = yiq * trans;
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60
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61 rgb = colorspace_conversion_revert (rgb, cls, sz, is_im, is_nd, is_int);
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62 endfunction
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63
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64 ## Test pure R, G, B colors
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65 %!assert (ntsc2rgb ([.299 .596 .211]), [1 0 0], 1e-5)
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66 %!assert (ntsc2rgb ([.587 -.274 -.523]), [0 1 0], 1e-5)
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67 %!assert (ntsc2rgb ([.114 -.322 .312]), [0 0 1], 1e-5)
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68
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69 %!test
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70 %! rgb_map = rand (64, 3);
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71 %! assert (ntsc2rgb (rgb2ntsc (rgb_map)), rgb_map, 1e-3);
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72
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73 %!test
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74 %! rgb_img = rand (64, 64, 3);
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75 %! assert (ntsc2rgb (rgb2ntsc (rgb_img)), rgb_img, 1e-3);
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76
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77 ## Test input validation
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78 %!error ntsc2rgb ()
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79 %!error ntsc2rgb (1,2)
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80 %!error <YIQ must be a colormap or YIQ image> ntsc2rgb (uint8 (1))
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81 %!error <YIQ must be a colormap or YIQ image> ntsc2rgb (ones (2,2))
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82
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83 ## Test ND input
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84 %!test
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85 %! yiq = rand (16, 16, 3, 5);
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86 %! rgb = zeros (size (yiq));
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87 %! for i = 1:5
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88 %! rgb(:,:,:,i) = ntsc2rgb (yiq(:,:,:,i));
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89 %! endfor
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90 %! assert (ntsc2rgb (yiq), rgb)