Mercurial > octave
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 |
rev | line source |
---|---|
27923
bd51beb6205e
update formatting of copyright notices
John W. Eaton <jwe@octave.org>
parents:
27919
diff
changeset
|
1 ######################################################################## |
bd51beb6205e
update formatting of copyright notices
John W. Eaton <jwe@octave.org>
parents:
27919
diff
changeset
|
2 ## |
27919
1891570abac8
update Octave Project Developers copyright for the new year
John W. Eaton <jwe@octave.org>
parents:
27918
diff
changeset
|
3 ## Copyright (C) 2018-2020 The Octave Project Developers |
27918
b442ec6dda5c
use centralized file for copyright info for individual contributors
John W. Eaton <jwe@octave.org>
parents:
26376
diff
changeset
|
4 ## |
27923
bd51beb6205e
update formatting of copyright notices
John W. Eaton <jwe@octave.org>
parents:
27919
diff
changeset
|
5 ## See the file COPYRIGHT.md in the top-level directory of this |
bd51beb6205e
update formatting of copyright notices
John W. Eaton <jwe@octave.org>
parents:
27919
diff
changeset
|
6 ## distribution or <https://octave.org/copyright/>. |
24610
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
7 ## |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
8 ## This file is part of Octave. |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
9 ## |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
10 ## Octave is free software: you can redistribute it and/or modify it |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
11 ## under the terms of the GNU General Public License as published by |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
12 ## the Free Software Foundation, either version 3 of the License, or |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
13 ## (at your option) any later version. |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
14 ## |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
15 ## Octave is distributed in the hope that it will be useful, but |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
16 ## WITHOUT ANY WARRANTY; without even the implied warranty of |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
17 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
18 ## GNU General Public License for more details. |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
19 ## |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
20 ## You should have received a copy of the GNU General Public License |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
21 ## along with Octave; see the file COPYING. If not, see |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
22 ## <https://www.gnu.org/licenses/>. |
27923
bd51beb6205e
update formatting of copyright notices
John W. Eaton <jwe@octave.org>
parents:
27919
diff
changeset
|
23 ## |
bd51beb6205e
update formatting of copyright notices
John W. Eaton <jwe@octave.org>
parents:
27919
diff
changeset
|
24 ######################################################################## |
24610
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
25 |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
26 ## -*- texinfo -*- |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
27 ## @deftypefn {} {@var{I} =} rgb2gray (@var{rgb_img}) |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
28 ## @deftypefnx {} {@var{gray_map} =} rgb2gray (@var{rgb_map}) |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
29 ## Transform an image or colormap from red-green-blue (RGB) color space to |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
30 ## a grayscale intensity image. |
24613
93219261164d
rgb2gray: fix conversion of nd images
Carnë Draug <carandraug@octave.org>
parents:
24612
diff
changeset
|
31 ## |
24612
6c8822790411
rgb2gray.m: Tweaks for Matlab compatibility.
Rik <rik@octave.org>
parents:
24610
diff
changeset
|
32 ## The input may be of class uint8, int8, uint16, int16, single, or double. |
6c8822790411
rgb2gray.m: Tweaks for Matlab compatibility.
Rik <rik@octave.org>
parents:
24610
diff
changeset
|
33 ## The output is of the same class as the input. |
24610
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
34 ## |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
35 ## Implementation Note: |
24613
93219261164d
rgb2gray: fix conversion of nd images
Carnë Draug <carandraug@octave.org>
parents:
24612
diff
changeset
|
36 ## The grayscale intensity is calculated as |
24610
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
37 ## |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
38 ## @example |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
39 ## @group |
24612
6c8822790411
rgb2gray.m: Tweaks for Matlab compatibility.
Rik <rik@octave.org>
parents:
24610
diff
changeset
|
40 ## @var{I} = 0.298936*@var{R} + 0.587043*@var{G} + 0.114021*@var{B} |
24610
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
41 ## @end group |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
42 ## @end example |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
43 ## |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
44 ## @noindent |
25003
2365c2661b3c
doc: Spellcheck documentation ahead of 4.4 release.
Rik <rik@octave.org>
parents:
24613
diff
changeset
|
45 ## which corresponds to the luminance channel when RGB is translated to |
25143
13fd0610480f
doc: Use https whenever possible in @url entries.
Rik <rik@octave.org>
parents:
25003
diff
changeset
|
46 ## @nospell{YIQ} as documented in @url{https://en.wikipedia.org/wiki/YIQ}. |
24610
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
47 ## @seealso{rgb2hsv, rgb2ind} |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
48 ## @end deftypefn |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
49 |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
50 function I = rgb2gray (rgb) |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
51 |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
52 if (nargin != 1) |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
53 print_usage (); |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
54 endif |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
55 |
24612
6c8822790411
rgb2gray.m: Tweaks for Matlab compatibility.
Rik <rik@octave.org>
parents:
24610
diff
changeset
|
56 is_int = isinteger (rgb); |
6c8822790411
rgb2gray.m: Tweaks for Matlab compatibility.
Rik <rik@octave.org>
parents:
24610
diff
changeset
|
57 if (is_int) |
6c8822790411
rgb2gray.m: Tweaks for Matlab compatibility.
Rik <rik@octave.org>
parents:
24610
diff
changeset
|
58 cls = class (rgb); |
6c8822790411
rgb2gray.m: Tweaks for Matlab compatibility.
Rik <rik@octave.org>
parents:
24610
diff
changeset
|
59 endif |
24610
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
60 [rgb, sz, is_im, is_nd] ... |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
61 = colorspace_conversion_input_check ("rgb2gray", "RGB", rgb); |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
62 |
24612
6c8822790411
rgb2gray.m: Tweaks for Matlab compatibility.
Rik <rik@octave.org>
parents:
24610
diff
changeset
|
63 ## Reference matrix for transform from http://en.wikipedia.org/wiki/YIQ. |
6c8822790411
rgb2gray.m: Tweaks for Matlab compatibility.
Rik <rik@octave.org>
parents:
24610
diff
changeset
|
64 ## Matlab uses this matrix for their conversion with oddly more precision. |
6c8822790411
rgb2gray.m: Tweaks for Matlab compatibility.
Rik <rik@octave.org>
parents:
24610
diff
changeset
|
65 xform = [0.298936; 0.587043; 0.114021]; |
24610
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
66 I = rgb * xform; |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
67 |
24613
93219261164d
rgb2gray: fix conversion of nd images
Carnë Draug <carandraug@octave.org>
parents:
24612
diff
changeset
|
68 sz(3) = 1; # grayscale images have 3rd dimension of length 1 |
93219261164d
rgb2gray: fix conversion of nd images
Carnë Draug <carandraug@octave.org>
parents:
24612
diff
changeset
|
69 I = colorspace_conversion_revert (I, sz, is_im, is_nd); |
24610
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
70 |
24612
6c8822790411
rgb2gray.m: Tweaks for Matlab compatibility.
Rik <rik@octave.org>
parents:
24610
diff
changeset
|
71 ## Restore integer class if necessary |
6c8822790411
rgb2gray.m: Tweaks for Matlab compatibility.
Rik <rik@octave.org>
parents:
24610
diff
changeset
|
72 if (is_int) |
6c8822790411
rgb2gray.m: Tweaks for Matlab compatibility.
Rik <rik@octave.org>
parents:
24610
diff
changeset
|
73 if (cls(end) == "8") # uint8 or int8 |
24613
93219261164d
rgb2gray: fix conversion of nd images
Carnë Draug <carandraug@octave.org>
parents:
24612
diff
changeset
|
74 I *= 255; |
24612
6c8822790411
rgb2gray.m: Tweaks for Matlab compatibility.
Rik <rik@octave.org>
parents:
24610
diff
changeset
|
75 if (cls(1) == "i") # int8 |
6c8822790411
rgb2gray.m: Tweaks for Matlab compatibility.
Rik <rik@octave.org>
parents:
24610
diff
changeset
|
76 I -= 128; |
6c8822790411
rgb2gray.m: Tweaks for Matlab compatibility.
Rik <rik@octave.org>
parents:
24610
diff
changeset
|
77 endif |
6c8822790411
rgb2gray.m: Tweaks for Matlab compatibility.
Rik <rik@octave.org>
parents:
24610
diff
changeset
|
78 else # uint16 or int16 |
24613
93219261164d
rgb2gray: fix conversion of nd images
Carnë Draug <carandraug@octave.org>
parents:
24612
diff
changeset
|
79 I *= 65535; |
24612
6c8822790411
rgb2gray.m: Tweaks for Matlab compatibility.
Rik <rik@octave.org>
parents:
24610
diff
changeset
|
80 if (cls(1) == "i") # int16 |
6c8822790411
rgb2gray.m: Tweaks for Matlab compatibility.
Rik <rik@octave.org>
parents:
24610
diff
changeset
|
81 I -= 32768; |
6c8822790411
rgb2gray.m: Tweaks for Matlab compatibility.
Rik <rik@octave.org>
parents:
24610
diff
changeset
|
82 endif |
6c8822790411
rgb2gray.m: Tweaks for Matlab compatibility.
Rik <rik@octave.org>
parents:
24610
diff
changeset
|
83 endif |
6c8822790411
rgb2gray.m: Tweaks for Matlab compatibility.
Rik <rik@octave.org>
parents:
24610
diff
changeset
|
84 I = feval (cls, I); |
6c8822790411
rgb2gray.m: Tweaks for Matlab compatibility.
Rik <rik@octave.org>
parents:
24610
diff
changeset
|
85 endif |
6c8822790411
rgb2gray.m: Tweaks for Matlab compatibility.
Rik <rik@octave.org>
parents:
24610
diff
changeset
|
86 |
24610
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
87 endfunction |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
88 |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
89 |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
90 ## Test pure RED, GREEN, BLUE colors |
24612
6c8822790411
rgb2gray.m: Tweaks for Matlab compatibility.
Rik <rik@octave.org>
parents:
24610
diff
changeset
|
91 %!assert (rgb2gray ([1 0 0]), 0.298936) |
6c8822790411
rgb2gray.m: Tweaks for Matlab compatibility.
Rik <rik@octave.org>
parents:
24610
diff
changeset
|
92 %!assert (rgb2gray ([0 1 0]), 0.587043) |
6c8822790411
rgb2gray.m: Tweaks for Matlab compatibility.
Rik <rik@octave.org>
parents:
24610
diff
changeset
|
93 %!assert (rgb2gray ([0 0 1]), 0.114021) |
24610
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
94 |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
95 ## test tolerance input checking on floats |
24612
6c8822790411
rgb2gray.m: Tweaks for Matlab compatibility.
Rik <rik@octave.org>
parents:
24610
diff
changeset
|
96 %! assert (rgb2gray ([1.5 1 1]), 1.149468, -1.6e-3); |
24610
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
97 |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
98 ## Test ND input |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
99 %!test |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
100 %! rgb = rand (16, 16, 3, 5); |
24613
93219261164d
rgb2gray: fix conversion of nd images
Carnë Draug <carandraug@octave.org>
parents:
24612
diff
changeset
|
101 %! I = zeros (16, 16, 1, 5); |
24610
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
102 %! for i = 1:5 |
24613
93219261164d
rgb2gray: fix conversion of nd images
Carnë Draug <carandraug@octave.org>
parents:
24612
diff
changeset
|
103 %! I(:,:,1,i) = rgb2gray (rgb(:,:,:,i)); |
24610
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
104 %! endfor |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
105 %! assert (rgb2gray (rgb), I); |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
106 |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
107 ## Test output class and size for input images. |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
108 ## Most of the tests only test for colormap input. |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
109 |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
110 %!test |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
111 %! I = rgb2gray (rand (10, 10, 3)); |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
112 %! assert (class (I), "double"); |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
113 %! assert (size (I), [10 10]); |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
114 |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
115 %!test |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
116 %! I = rgb2gray (rand (10, 10, 3, "single")); |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
117 %! assert (class (I), "single"); |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
118 %! assert (size (I), [10 10]); |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
119 |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
120 %!test |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
121 %! rgb = (rand (10, 10, 3) * 3 ) - 0.5; # values outside range [0 1] |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
122 %! I = rgb2gray (rgb); |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
123 %! assert (class (I), "double"); |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
124 %! assert (size (I), [10 10]); |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
125 |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
126 %!test |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
127 %! rgb = (rand (10, 10, 3, "single") * 3 ) - 0.5; # values outside range [0 1] |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
128 %! I = rgb2gray (rgb); |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
129 %! assert (class (I), "single"); |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
130 %! assert (size (I), [10 10]); |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
131 |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
132 %!test |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
133 %! I = rgb2gray (randi ([0 255], 10, 10, 3, "uint8")); |
24612
6c8822790411
rgb2gray.m: Tweaks for Matlab compatibility.
Rik <rik@octave.org>
parents:
24610
diff
changeset
|
134 %! assert (class (I), "uint8"); |
24610
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
135 %! assert (size (I), [10 10]); |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
136 |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
137 %!test |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
138 %! I = rgb2gray (randi ([0 65535], 10, 10, 3, "uint16")); |
24612
6c8822790411
rgb2gray.m: Tweaks for Matlab compatibility.
Rik <rik@octave.org>
parents:
24610
diff
changeset
|
139 %! assert (class (I), "uint16"); |
24610
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
140 %! assert (size (I), [10 10]); |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
141 |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
142 %!test |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
143 %! I = rgb2gray (randi ([-128 127], 10, 10, 3, "int8")); |
24612
6c8822790411
rgb2gray.m: Tweaks for Matlab compatibility.
Rik <rik@octave.org>
parents:
24610
diff
changeset
|
144 %! assert (class (I), "int8"); |
6c8822790411
rgb2gray.m: Tweaks for Matlab compatibility.
Rik <rik@octave.org>
parents:
24610
diff
changeset
|
145 %! assert (size (I), [10 10]); |
6c8822790411
rgb2gray.m: Tweaks for Matlab compatibility.
Rik <rik@octave.org>
parents:
24610
diff
changeset
|
146 |
6c8822790411
rgb2gray.m: Tweaks for Matlab compatibility.
Rik <rik@octave.org>
parents:
24610
diff
changeset
|
147 %!test |
6c8822790411
rgb2gray.m: Tweaks for Matlab compatibility.
Rik <rik@octave.org>
parents:
24610
diff
changeset
|
148 %! I = rgb2gray (randi ([-32768 32767], 10, 10, 3, "int16")); |
6c8822790411
rgb2gray.m: Tweaks for Matlab compatibility.
Rik <rik@octave.org>
parents:
24610
diff
changeset
|
149 %! assert (class (I), "int16"); |
24610
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
150 %! assert (size (I), [10 10]); |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
151 |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
152 %!test |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
153 %! rgb_double = reshape ([1 0 0 0 0 1 0 0 0 0 1 0], [2 2 3]); |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
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.
Rik <rik@octave.org>
parents:
diff
changeset
|
155 %! [2 2 3]); |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
156 %! rgb_int16 = int16 (double (rgb_double * uint16 (65535)) - 32768); |
24612
6c8822790411
rgb2gray.m: Tweaks for Matlab compatibility.
Rik <rik@octave.org>
parents:
24610
diff
changeset
|
157 %! expected = [0.298936, 0.114021; 0.587043, 0.0]; |
24610
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
158 %! |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
159 %! assert (rgb2gray (rgb_double), expected); |
24612
6c8822790411
rgb2gray.m: Tweaks for Matlab compatibility.
Rik <rik@octave.org>
parents:
24610
diff
changeset
|
160 %! assert (rgb2gray (rgb_uint8), uint8 (expected*255)); |
24610
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
161 %! assert (rgb2gray (single (rgb_double)), single (expected)); |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
162 |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
163 ## Test input validation |
28886
d8318c12d903
test: remove unnecessary BIST tests in m-files checking for excessive number of inputs.
Rik <rik@octave.org>
parents:
27923
diff
changeset
|
164 %!error <Invalid call> rgb2gray () |
24610
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
165 %!error <invalid data type 'cell'> rgb2gray ({1}) |
3ad53e4793fc
rgb2gray: New function to convert RGB images to grayscale images.
Rik <rik@octave.org>
parents:
diff
changeset
|
166 %!error <RGB must be a colormap or RGB image> rgb2gray (ones (2,2)) |