annotate scripts/image/rgb2gray.m @ 28886:d8318c12d903

test: remove unnecessary BIST tests in m-files checking for excessive number of inputs. Remove BIST tests now that interpreter enforces calling function with no more than the number of arguments defined in the function prototype. * makeUniqueStrings.m, makeValidName.m, base64decode.m, base64encode.m, record.m, sound.m, soundsc.m, acosd.m, acot.m, acotd.m, acoth.m, acsc.m, acscd.m, acsch.m, asec.m, asecd.m, asech.m, asind.m, atan2d.m, atand.m, cosd.m, cot.m, cotd.m, coth.m, csc.m, cscd.m, csch.m, sec.m, secd.m, sech.m, sind.m, tand.m, accumdim.m, bincoeff.m, bitget.m, bitset.m, cell2mat.m, circshift.m, cplxpair.m, cumtrapz.m, deg2rad.m, flip.m, fliplr.m, flipud.m, int2str.m, interpft.m, logspace.m, num2str.m, postpad.m, prepad.m, rad2deg.m, rot90.m, rotdim.m, shift.m, subsindex.m, trapz.m, rotx.m, roty.m, rotz.m, getappdata.m, getpixelposition.m, guidata.m, isappdata.m, waitforbuttonpress.m, __gripe_missing_component__.m, bessel.m, hsv2rgb.m, ind2gray.m, rgb2gray.m, rgb2hsv.m, rgbplot.m, fileread.m, javachk.m, usejava.m, findstr.m, genvarname.m, isdir.m, vectorize.m, cond.m, cross.m, duplication_matrix.m, expm.m, isbanded.m, isdefinite.m, isdiag.m, ishermitian.m, issymmetric.m, istril.m, istriu.m, trace.m, vech.m, vecnorm.m, cast.m, citation.m, compare_versions.m, grabcode.m, inputname.m, isfile.m, isfolder.m, ismac.m, ispc.m, isunix.m, list_primes.m, methods.m, news.m, open.m, run.m, swapbytes.m, tar.m, verLessThan.m, zip.m, odeget.m, optimget.m, stemleaf.m, allchild.m, ancestor.m, close.m, groot.m, hgsave.m, isaxes.m, isfigure.m, isgraphics.m, ishandle.m, isprop.m, linkaxes.m, rotate.m, saveas.m, conv.m, poly.m, polyint.m, polyreduce.m, ppval.m, roots.m, addpref.m, getpref.m, ispref.m, rmpref.m, setpref.m, profile.m, profshow.m, powerset.m, autoreg_matrix.m, bartlett.m, blackman.m, detrend.m, fftconv.m, fftfilt.m, fftshift.m, hamming.m, hanning.m, ifftshift.m, sinewave.m, spectral_adf.m, spectral_xdf.m, unwrap.m, nonzeros.m, spconvert.m, sprand.m, sprandn.m, beta.m, betainc.m, betaln.m, cosint.m, expint.m, factorial.m, legendre.m, nchoosek.m, nthroot.m, perms.m, pow2.m, primes.m, reallog.m, realpow.m, realsqrt.m, sinint.m, hankel.m, hilb.m, invhilb.m, magic.m, pascal.m, toeplitz.m, vander.m, wilkinson.m, center.m, corr.m, cov.m, discrete_cdf.m, discrete_inv.m, discrete_pdf.m, empirical_cdf.m, empirical_inv.m, empirical_pdf.m, iqr.m, kendall.m, kurtosis.m, mad.m, meansq.m, median.m, moment.m, prctile.m, quantile.m, range.m, run_count.m, skewness.m, spearman.m, statistics.m, std.m, var.m, base2dec.m, bin2dec.m, blanks.m, dec2base.m, dec2bin.m, dec2hex.m, endsWith.m, erase.m, hex2dec.m, index.m, isletter.m, isstring.m, isstrprop.m, mat2str.m, ostrsplit.m, rindex.m, startsWith.m, strtrunc.m, substr.m, fail.m, addtodate.m, asctime.m, ctime.m, date.m, datestr.m, eomday.m, etime.m, is_leap_year.m, now.m: remove unnecessary BIST tests in m-files checking for excessive number of inputs.
author Rik <rik@octave.org>
date Fri, 09 Oct 2020 13:28:53 -0700
parents bd51beb6205e
children de5f2f9a64ff
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1 ########################################################################
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2 ##
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3 ## Copyright (C) 2018-2020 The Octave Project Developers
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4 ##
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5 ## See the file COPYRIGHT.md in the top-level directory of this
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6 ## distribution or <https://octave.org/copyright/>.
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7 ##
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8 ## This file is part of Octave.
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9 ##
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10 ## Octave is free software: you can redistribute it and/or modify it
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11 ## under the terms of the GNU General Public License as published by
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12 ## the Free Software Foundation, either version 3 of the License, or
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13 ## (at your option) any later version.
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14 ##
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15 ## Octave is distributed in the hope that it will be useful, but
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16 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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17 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 ## GNU General Public License for more details.
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19 ##
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20 ## You should have received a copy of the GNU General Public License
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21 ## along with Octave; see the file COPYING. If not, see
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22 ## <https://www.gnu.org/licenses/>.
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23 ##
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24 ########################################################################
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25
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26 ## -*- texinfo -*-
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27 ## @deftypefn {} {@var{I} =} rgb2gray (@var{rgb_img})
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28 ## @deftypefnx {} {@var{gray_map} =} rgb2gray (@var{rgb_map})
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29 ## Transform an image or colormap from red-green-blue (RGB) color space to
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30 ## a grayscale intensity image.
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31 ##
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32 ## The input may be of class uint8, int8, uint16, int16, single, or double.
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33 ## The output is of the same class as the input.
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34 ##
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35 ## Implementation Note:
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36 ## The grayscale intensity is calculated as
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37 ##
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38 ## @example
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39 ## @group
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40 ## @var{I} = 0.298936*@var{R} + 0.587043*@var{G} + 0.114021*@var{B}
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41 ## @end group
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42 ## @end example
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43 ##
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44 ## @noindent
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45 ## which corresponds to the luminance channel when RGB is translated to
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46 ## @nospell{YIQ} as documented in @url{https://en.wikipedia.org/wiki/YIQ}.
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47 ## @seealso{rgb2hsv, rgb2ind}
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48 ## @end deftypefn
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49
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50 function I = rgb2gray (rgb)
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51
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52 if (nargin != 1)
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53 print_usage ();
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54 endif
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55
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56 is_int = isinteger (rgb);
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57 if (is_int)
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58 cls = class (rgb);
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59 endif
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60 [rgb, sz, is_im, is_nd] ...
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61 = colorspace_conversion_input_check ("rgb2gray", "RGB", rgb);
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62
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63 ## Reference matrix for transform from http://en.wikipedia.org/wiki/YIQ.
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64 ## Matlab uses this matrix for their conversion with oddly more precision.
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65 xform = [0.298936; 0.587043; 0.114021];
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66 I = rgb * xform;
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67
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68 sz(3) = 1; # grayscale images have 3rd dimension of length 1
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69 I = colorspace_conversion_revert (I, sz, is_im, is_nd);
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70
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71 ## Restore integer class if necessary
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72 if (is_int)
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73 if (cls(end) == "8") # uint8 or int8
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74 I *= 255;
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75 if (cls(1) == "i") # int8
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76 I -= 128;
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77 endif
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78 else # uint16 or int16
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79 I *= 65535;
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80 if (cls(1) == "i") # int16
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81 I -= 32768;
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82 endif
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83 endif
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84 I = feval (cls, I);
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85 endif
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86
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87 endfunction
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88
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89
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90 ## Test pure RED, GREEN, BLUE colors
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91 %!assert (rgb2gray ([1 0 0]), 0.298936)
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92 %!assert (rgb2gray ([0 1 0]), 0.587043)
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93 %!assert (rgb2gray ([0 0 1]), 0.114021)
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94
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95 ## test tolerance input checking on floats
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96 %! assert (rgb2gray ([1.5 1 1]), 1.149468, -1.6e-3);
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97
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98 ## Test ND input
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99 %!test
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100 %! rgb = rand (16, 16, 3, 5);
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101 %! I = zeros (16, 16, 1, 5);
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102 %! for i = 1:5
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103 %! I(:,:,1,i) = rgb2gray (rgb(:,:,:,i));
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104 %! endfor
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105 %! assert (rgb2gray (rgb), I);
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106
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107 ## Test output class and size for input images.
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108 ## Most of the tests only test for colormap input.
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109
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110 %!test
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111 %! I = rgb2gray (rand (10, 10, 3));
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112 %! assert (class (I), "double");
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113 %! assert (size (I), [10 10]);
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114
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115 %!test
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116 %! I = rgb2gray (rand (10, 10, 3, "single"));
3ad53e4793fc rgb2gray: New function to convert RGB images to grayscale images.
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117 %! assert (class (I), "single");
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118 %! assert (size (I), [10 10]);
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119
3ad53e4793fc rgb2gray: New function to convert RGB images to grayscale images.
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120 %!test
3ad53e4793fc rgb2gray: New function to convert RGB images to grayscale images.
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121 %! rgb = (rand (10, 10, 3) * 3 ) - 0.5; # values outside range [0 1]
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122 %! I = rgb2gray (rgb);
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123 %! assert (class (I), "double");
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124 %! assert (size (I), [10 10]);
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125
3ad53e4793fc rgb2gray: New function to convert RGB images to grayscale images.
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126 %!test
3ad53e4793fc rgb2gray: New function to convert RGB images to grayscale images.
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127 %! rgb = (rand (10, 10, 3, "single") * 3 ) - 0.5; # values outside range [0 1]
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128 %! I = rgb2gray (rgb);
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129 %! assert (class (I), "single");
3ad53e4793fc rgb2gray: New function to convert RGB images to grayscale images.
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130 %! assert (size (I), [10 10]);
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131
3ad53e4793fc rgb2gray: New function to convert RGB images to grayscale images.
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132 %!test
3ad53e4793fc rgb2gray: New function to convert RGB images to grayscale images.
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133 %! I = rgb2gray (randi ([0 255], 10, 10, 3, "uint8"));
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134 %! assert (class (I), "uint8");
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135 %! assert (size (I), [10 10]);
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136
3ad53e4793fc rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
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137 %!test
3ad53e4793fc rgb2gray: New function to convert RGB images to grayscale images.
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138 %! I = rgb2gray (randi ([0 65535], 10, 10, 3, "uint16"));
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139 %! assert (class (I), "uint16");
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140 %! assert (size (I), [10 10]);
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141
3ad53e4793fc rgb2gray: New function to convert RGB images to grayscale images.
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142 %!test
3ad53e4793fc rgb2gray: New function to convert RGB images to grayscale images.
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143 %! I = rgb2gray (randi ([-128 127], 10, 10, 3, "int8"));
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144 %! assert (class (I), "int8");
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145 %! assert (size (I), [10 10]);
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146
6c8822790411 rgb2gray.m: Tweaks for Matlab compatibility.
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147 %!test
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148 %! I = rgb2gray (randi ([-32768 32767], 10, 10, 3, "int16"));
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149 %! assert (class (I), "int16");
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150 %! assert (size (I), [10 10]);
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151
3ad53e4793fc rgb2gray: New function to convert RGB images to grayscale images.
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152 %!test
3ad53e4793fc rgb2gray: New function to convert RGB images to grayscale images.
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153 %! rgb_double = reshape ([1 0 0 0 0 1 0 0 0 0 1 0], [2 2 3]);
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154 %! rgb_uint8 = reshape (uint8 ([255 0 0 0 0 255 0 0 0 0 255 0]),
3ad53e4793fc rgb2gray: New function to convert RGB images to grayscale images.
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155 %! [2 2 3]);
3ad53e4793fc rgb2gray: New function to convert RGB images to grayscale images.
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156 %! rgb_int16 = int16 (double (rgb_double * uint16 (65535)) - 32768);
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157 %! expected = [0.298936, 0.114021; 0.587043, 0.0];
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158 %!
3ad53e4793fc rgb2gray: New function to convert RGB images to grayscale images.
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159 %! assert (rgb2gray (rgb_double), expected);
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160 %! assert (rgb2gray (rgb_uint8), uint8 (expected*255));
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161 %! assert (rgb2gray (single (rgb_double)), single (expected));
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162
3ad53e4793fc rgb2gray: New function to convert RGB images to grayscale images.
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163 ## Test input validation
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164 %!error <Invalid call> rgb2gray ()
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165 %!error <invalid data type 'cell'> rgb2gray ({1})
3ad53e4793fc rgb2gray: New function to convert RGB images to grayscale images.
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166 %!error <RGB must be a colormap or RGB image> rgb2gray (ones (2,2))