Mercurial > octave
view scripts/image/rgb2hsv.m @ 27978:a4268efb7334
maint: Eliminate single "Author:" lines from code base.
* color-picker.cc, color-picker.h, octave-qscintilla.cc, octave-qscintilla.h,
octave-txt-lexer.cc, octave-txt-lexer.h, balance.cc, kron.cc, lookup.cc,
ls-hdf5.cc, ls-mat5.cc, ls-oct-text.cc, sylvester.cc, tsearch.cc, jit-ir.cc,
jit-ir.h, jit-typeinfo.cc, jit-typeinfo.h, jit-util.cc, jit-util.h, pt-jit.cc,
pt-jit.h, Array-jit.cc, bsxfun.h, url-transfer.cc, url-transfer.h, acosd.m,
acotd.m, acscd.m, asecd.m, asind.m, atand.m, cosd.m, cotd.m, cscd.m, secd.m,
sind.m, tand.m, cart2pol.m, cart2sph.m, curl.m, del2.m, divergence.m, flip.m,
pol2cart.m, randi.m, sortrows.m, sph2cart.m, griddata3.m, griddatan.m,
rectint.m, voronoi.m, dialog.m, guidata.m, guihandles.m, __file_filter__.m,
__fltk_file_filter__.m, __get_funcname__.m, __is_function__.m,
__uigetdir_fltk__.m, __uigetfile_fltk__.m, __uiobject_split_args__.m,
__uiputfile_fltk__.m, uibuttongroup.m, uicontextmenu.m, uicontrol.m,
uigetdir.m, uigetfile.m, uimenu.m, uipanel.m, uipushtool.m, uiputfile.m,
uiresume.m, uitoggletool.m, uitoolbar.m, uiwait.m, doc.m, autumn.m, bone.m,
cmpermute.m, cmunique.m, cool.m, copper.m, cubehelix.m, flag.m, frame2im.m,
hot.m, hsv.m, hsv2rgb.m, im2frame.m, imfinfo.m, imformats.m, iscolormap.m,
jet.m, pink.m, prism.m, __imfinfo__.m, rainbow.m, rgb2hsv.m, spinmap.m,
spring.m, viridis.m, white.m, winter.m, importdata.m, strmatch.m, bandwidth.m,
isbanded.m, isdiag.m, istril.m, istriu.m, krylov.m, linsolve.m, logm.m,
lscov.m, subspace.m, bunzip2.m, compare_versions.m, edit.m, fullfile.m,
getfield.m, gunzip.m, inputParser.m, license.m, nargchk.m, narginchk.m,
nthargout.m, python.m, setfield.m, tar.m, unpack.m, ver.m, zip.m, odeplot.m,
fminbnd.m, fminunc.m, fsolve.m, fzero.m, glpk.m, humps.m, pathdef.m,
savepath.m, diffuse.m, lighting.m, material.m, shading.m, specular.m,
contour.m, ellipsoid.m, isocaps.m, isocolors.m, isonormals.m, isosurface.m,
light.m, pcolor.m, __interp_cube__.m, __marching_cube__.m, __patch__.m,
__stem__.m, reducepatch.m, reducevolume.m, ribbon.m, shrinkfaces.m, slice.m,
stem.m, surf.m, surfl.m, tetramesh.m, waterfall.m, __actual_axis_position__.m,
__next_line_color__.m, allchild.m, figure.m, findall.m, findobj.m, gcf.m,
hggroup.m, isprop.m, ndgrid.m, __add_default_menu__.m, saveas.m,
__splinefit__.m, prefdir.m, preferences.m, profexplore.m, profexport.m,
profile.m, profshow.m, setdiff.m, freqz.m, freqz_plot.m, sinc.m, unwrap.m,
pcr.m, qmr.m, sprandn.m, betaincinv.m, cosint.m, ellipke.m, factor.m,
gammaincinv.m, legendre.m, nchoosek.m, primes.m, invhilb.m, toeplitz.m,
erase.m, mat2str.m, strtrim.m, validatestring.m, fail.m, compare_plot_demos.m,
dump_demos.m, html_compare_plot_demos.m, addtodate.m, datenum.m, jit.tst:
Eliminate single "Author:" lines from code base.
author | Rik <rik@octave.org> |
---|---|
date | Tue, 21 Jan 2020 12:53:13 -0800 |
parents | bd51beb6205e |
children | d8318c12d903 0a5b15007766 |
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######################################################################## ## ## Copyright (C) 1999-2020 The Octave Project Developers ## ## See the file COPYRIGHT.md in the top-level directory of this ## distribution or <https://octave.org/copyright/>. ## ## 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 ## <https://www.gnu.org/licenses/>. ## ######################################################################## ## -*- texinfo -*- ## @deftypefn {} {@var{hsv_map} =} rgb2hsv (@var{rgb_map}) ## @deftypefnx {} {@var{hsv_img} =} rgb2hsv (@var{rgb_img}) ## Transform a colormap or image from RGB to HSV color space. ## ## A color in the RGB space consists of red, green, and blue intensities. ## ## A color in HSV space is represented by hue, saturation and value ## (brightness) levels in a cylindrical coordinate system. Hue is the ## azimuth and describes the dominant color. Saturation is the radial ## distance and gives the amount of hue mixed into the color. Value is ## the height and is the amount of light in the color. ## ## Output class and size will be the same as input. ## ## @seealso{hsv2rgb, rgb2ind, rgb2gray} ## @end deftypefn function hsv = rgb2hsv (rgb) if (nargin != 1) print_usage (); endif [rgb, sz, is_im, is_nd] ... = colorspace_conversion_input_check ("rgb2hsv", "RGB", rgb); ## get the max and min for each row s = min (rgb, [], 2); v = max (rgb, [], 2); ## set hue to zero for undefined values (gray has no hue) h = zeros (rows (rgb), 1); notgray = (s != v); ## blue hue idx = (v == rgb(:,3) & notgray); if (any (idx)) h(idx) = 2/3 + 1/6 * (rgb(idx,1) - rgb(idx,2)) ./ (v(idx) - s(idx)); endif ## green hue idx = (v == rgb(:,2) & notgray); if (any (idx)) h(idx) = 1/3 + 1/6 * (rgb(idx,3) - rgb(idx,1)) ./ (v(idx) - s(idx)); endif ## red hue idx = (v == rgb(:,1) & notgray); if (any (idx)) h(idx) = 1/6 * (rgb(idx,2) - rgb(idx,3)) ./ (v(idx) - s(idx)); endif h(h < 0) += 1; # correct for negative red ## set the saturation s(! notgray) = 0; s(notgray) = 1 - s(notgray) ./ v(notgray); hsv = [h, s, v]; hsv = colorspace_conversion_revert (hsv, sz, is_im, is_nd); endfunction ## Test pure colors and gray %!assert (rgb2hsv ([1 0 0]), [0 1 1]) %!assert (rgb2hsv ([0 1 0]), [1/3 1 1]) %!assert (rgb2hsv ([0 0 1]), [2/3 1 1]) %!assert (rgb2hsv ([1 1 0]), [1/6 1 1]) %!assert (rgb2hsv ([0 1 1]), [1/2 1 1]) %!assert (rgb2hsv ([1 0 1]), [5/6 1 1]) %!assert (rgb2hsv ([0.5 0.5 0.5]), [0 0 0.5]) ## Test tolarant input checking on floats %!assert (rgb2hsv ([1.5 1 1]), [0 1/3 1.5], eps) %!test %! rgb_map = rand (64, 3); %! assert (hsv2rgb (rgb2hsv (rgb_map)), rgb_map, 1e-6); %!test %! rgb_img = rand (64, 64, 3); %! assert (hsv2rgb (rgb2hsv (rgb_img)), rgb_img, 1e-6); ## support sparse input %!assert (rgb2hsv (sparse ([0 0 1])), sparse ([2/3 1 1])) %!assert (rgb2hsv (sparse ([0 1 1])), sparse ([1/2 1 1])) %!assert (rgb2hsv (sparse ([1 1 1])), sparse ([0 0 1])) ## Test input validation %!error rgb2hsv () %!error rgb2hsv (1,2) %!error <invalid data type 'cell'> rgb2hsv ({1}) %!error <RGB must be a colormap or RGB image> rgb2hsv (ones (2,2)) ## Test ND input %!test %! rgb = rand (16, 16, 3, 5); %! hsv = zeros (size (rgb)); %! for i = 1:5 %! hsv(:,:,:,i) = rgb2hsv (rgb(:,:,:,i)); %! endfor %! assert (rgb2hsv (rgb), hsv); ## Test output class and size for input images. ## Most of the tests only test for colormap input. %!test %! hsv = rgb2hsv (rand (10, 10, 3)); %! assert (class (hsv), "double"); %! assert (size (hsv), [10 10 3]); %!test %! hsv = rgb2hsv (rand (10, 10, 3, "single")); %! assert (class (hsv), "single"); %! assert (size (hsv), [10 10 3]); %!test %! rgb = (rand (10, 10, 3) * 3 ) - 0.5; # values outside range [0 1] %! hsv = rgb2hsv (rgb); %! assert (class (hsv), "double"); %! assert (size (hsv), [10 10 3]); %!test %! rgb = (rand (10, 10, 3, "single") * 3 ) - 0.5; # values outside range [0 1] %! hsv = rgb2hsv (rgb); %! assert (class (hsv), "single"); %! assert (size (hsv), [10 10 3]); %!test %! hsv = rgb2hsv (randi ([0 255], 10, 10, 3, "uint8")); %! assert (class (hsv), "double"); %! assert (size (hsv), [10 10 3]); %!test %! hsv = rgb2hsv (randi ([0 65535], 10, 10, 3, "uint16")); %! assert (class (hsv), "double"); %! assert (size (hsv), [10 10 3]); %!test %! hsv = rgb2hsv (randi ([-128 127], 10, 10, 3, "int8")); %! assert (class (hsv), "double"); %! assert (size (hsv), [10 10 3]); %!test %! rgb_double = reshape ([1 0 1 .5 1 1 0 .5 0 1 1 .5], [2 2 3]); %! rgb_uint8 = reshape (uint8 ([255 0 255 128 255 255 0 128 0 255 255 128]), %! [2 2 3]); %! rgb_int16 = int16 (double (rgb_double * uint16 (65535)) -32768); %! expected = reshape ([1/6 1/2 5/6 0 1 1 1 0 1 1 1 .5], [2 2 3]); %! %! assert (rgb2hsv (rgb_double), expected); %! assert (rgb2hsv (rgb_uint8), expected, 0.005); %! assert (rgb2hsv (single (rgb_double)), single (expected));