octave-lyh: scripts/image/rgb2hsv.m annotate

annotate scripts/image/rgb2hsv.m @ 17535:c12c688a35ed default tip lyh

Fix warnings

author	LYH <lyh.kernel@gmail.com>
date	Fri, 27 Sep 2013 17:43:27 +0800
parents	b1cd65881592
children

rev	line source
14138 72c96de7a403 maint: update copyright notices for 2012 John W. Eaton <jwe@octave.org> parents: 11587 diff changeset	1 ## Copyright (C) 1999-2012 Kai Habel
3803 63c75bc3db82 [project @ 2001-02-28 08:24:40 by jwe] jwe parents: diff changeset	2 ##
63c75bc3db82 [project @ 2001-02-28 08:24:40 by jwe] jwe parents: diff changeset	3 ## This file is part of Octave.
63c75bc3db82 [project @ 2001-02-28 08:24:40 by jwe] jwe parents: diff changeset	4 ##
63c75bc3db82 [project @ 2001-02-28 08:24:40 by jwe] jwe parents: diff changeset	5 ## Octave is free software; you can redistribute it and/or modify it
63c75bc3db82 [project @ 2001-02-28 08:24:40 by jwe] jwe parents: diff changeset	6 ## under the terms of the GNU General Public License as published by
7016 93c65f2a5668 [project @ 2007-10-12 06:40:56 by jwe] jwe parents: 7001 diff changeset	7 ## the Free Software Foundation; either version 3 of the License, or (at
93c65f2a5668 [project @ 2007-10-12 06:40:56 by jwe] jwe parents: 7001 diff changeset	8 ## your option) any later version.
3803 63c75bc3db82 [project @ 2001-02-28 08:24:40 by jwe] jwe parents: diff changeset	9 ##
63c75bc3db82 [project @ 2001-02-28 08:24:40 by jwe] jwe parents: diff changeset	10 ## Octave is distributed in the hope that it will be useful, but
63c75bc3db82 [project @ 2001-02-28 08:24:40 by jwe] jwe parents: diff changeset	11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
63c75bc3db82 [project @ 2001-02-28 08:24:40 by jwe] jwe parents: diff changeset	12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
63c75bc3db82 [project @ 2001-02-28 08:24:40 by jwe] jwe parents: diff changeset	13 ## General Public License for more details.
63c75bc3db82 [project @ 2001-02-28 08:24:40 by jwe] jwe parents: diff changeset	14 ##
63c75bc3db82 [project @ 2001-02-28 08:24:40 by jwe] jwe parents: diff changeset	15 ## You should have received a copy of the GNU General Public License
7016 93c65f2a5668 [project @ 2007-10-12 06:40:56 by jwe] jwe parents: 7001 diff changeset	16 ## along with Octave; see the file COPYING. If not, see
93c65f2a5668 [project @ 2007-10-12 06:40:56 by jwe] jwe parents: 7001 diff changeset	17 ## <http://www.gnu.org/licenses/>.
3803 63c75bc3db82 [project @ 2001-02-28 08:24:40 by jwe] jwe parents: diff changeset	18
63c75bc3db82 [project @ 2001-02-28 08:24:40 by jwe] jwe parents: diff changeset	19 ## -- texinfo --
14260 1f911333ed3d doc: Update docstrings for functions in image/ directory Rik <octave@nomad.inbox5.com> parents: 14138 diff changeset	20 ## @deftypefn {Function File} {@var{hsv_map} =} rgb2hsv (@var{rgb})
1f911333ed3d doc: Update docstrings for functions in image/ directory Rik <octave@nomad.inbox5.com> parents: 14138 diff changeset	21 ## @deftypefnx {Function File} {@var{hsv_map} =} rgb2hsv (@var{rgb})
1f911333ed3d doc: Update docstrings for functions in image/ directory Rik <octave@nomad.inbox5.com> parents: 14138 diff changeset	22 ## Transform a colormap or image from red-green-blue (RGB) space to
1f911333ed3d doc: Update docstrings for functions in image/ directory Rik <octave@nomad.inbox5.com> parents: 14138 diff changeset	23 ## hue-saturation-value (HSV) space.
3803 63c75bc3db82 [project @ 2001-02-28 08:24:40 by jwe] jwe parents: diff changeset	24 ##
14260 1f911333ed3d doc: Update docstrings for functions in image/ directory Rik <octave@nomad.inbox5.com> parents: 14138 diff changeset	25 ## A color in the RGB space consists of red, green, and blue intensities.
1f911333ed3d doc: Update docstrings for functions in image/ directory Rik <octave@nomad.inbox5.com> parents: 14138 diff changeset	26 ##
15714 b1cd65881592 Clean up scripts in image directory. Rik <rik@octave.org> parents: 15683 diff changeset	27 ## A color in HSV space is represented by hue, saturation, and value
14260 1f911333ed3d doc: Update docstrings for functions in image/ directory Rik <octave@nomad.inbox5.com> parents: 14138 diff changeset	28 ## (brightness) levels. Value gives the amount of light in the color. Hue
1f911333ed3d doc: Update docstrings for functions in image/ directory Rik <octave@nomad.inbox5.com> parents: 14138 diff changeset	29 ## describes the dominant wavelength. Saturation is the amount of hue mixed
1f911333ed3d doc: Update docstrings for functions in image/ directory Rik <octave@nomad.inbox5.com> parents: 14138 diff changeset	30 ## into the color.
1f911333ed3d doc: Update docstrings for functions in image/ directory Rik <octave@nomad.inbox5.com> parents: 14138 diff changeset	31 ## @seealso{hsv2rgb, rgb2ind, rgb2ntsc}
3803 63c75bc3db82 [project @ 2001-02-28 08:24:40 by jwe] jwe parents: diff changeset	32 ## @end deftypefn
63c75bc3db82 [project @ 2001-02-28 08:24:40 by jwe] jwe parents: diff changeset	33
63c75bc3db82 [project @ 2001-02-28 08:24:40 by jwe] jwe parents: diff changeset	34 ## Author: Kai Habel <kai.habel@gmx.de>
63c75bc3db82 [project @ 2001-02-28 08:24:40 by jwe] jwe parents: diff changeset	35 ## Adapted-by: jwe
63c75bc3db82 [project @ 2001-02-28 08:24:40 by jwe] jwe parents: diff changeset	36
11469 c776f063fefe Overhaul m-script files to use common variable name between code and documentation. Rik <octave@nomad.inbox5.com> parents: 10791 diff changeset	37 function hsv_map = rgb2hsv (rgb)
3803 63c75bc3db82 [project @ 2001-02-28 08:24:40 by jwe] jwe parents: diff changeset	38
63c75bc3db82 [project @ 2001-02-28 08:24:40 by jwe] jwe parents: diff changeset	39 if (nargin != 1)
6046 34f96dd5441b [project @ 2006-10-10 16:10:25 by jwe] jwe parents: 5642 diff changeset	40 print_usage ();
3803 63c75bc3db82 [project @ 2001-02-28 08:24:40 by jwe] jwe parents: diff changeset	41 endif
63c75bc3db82 [project @ 2001-02-28 08:24:40 by jwe] jwe parents: diff changeset	42
15683 806ea52af230 Overhaul m-files in image directory to provide better support for images stored as integers. Rik <rik@octave.org> parents: 14260 diff changeset	43 cls = class (rgb);
15714 b1cd65881592 Clean up scripts in image directory. Rik <rik@octave.org> parents: 15683 diff changeset	44 if (! any (strcmp (cls, {"uint8", "uint16", "single", "double"})))
15683 806ea52af230 Overhaul m-files in image directory to provide better support for images stored as integers. Rik <rik@octave.org> parents: 14260 diff changeset	45 error ("rgb2hsv: invalid data type '%s'", cls);
806ea52af230 Overhaul m-files in image directory to provide better support for images stored as integers. Rik <rik@octave.org> parents: 14260 diff changeset	46 elseif (isfloat (rgb) && (any (rgb(:) < 0) \|\| any (rgb(:) > 1)))
806ea52af230 Overhaul m-files in image directory to provide better support for images stored as integers. Rik <rik@octave.org> parents: 14260 diff changeset	47 error ("rgb2hsv: floating point images may only contain values between 0 and 1");
806ea52af230 Overhaul m-files in image directory to provide better support for images stored as integers. Rik <rik@octave.org> parents: 14260 diff changeset	48 endif
806ea52af230 Overhaul m-files in image directory to provide better support for images stored as integers. Rik <rik@octave.org> parents: 14260 diff changeset	49
7375 4fbfce35012a [project @ 2008-01-15 01:04:06 by jwe] jwe parents: 7017 diff changeset	50 ## If we have an image convert it into a color map.
15683 806ea52af230 Overhaul m-files in image directory to provide better support for images stored as integers. Rik <rik@octave.org> parents: 14260 diff changeset	51 if (isreal (rgb) && ndims (rgb) == 3)
7375 4fbfce35012a [project @ 2008-01-15 01:04:06 by jwe] jwe parents: 7017 diff changeset	52 is_image = true;
15683 806ea52af230 Overhaul m-files in image directory to provide better support for images stored as integers. Rik <rik@octave.org> parents: 14260 diff changeset	53 sz = size (rgb);
7375 4fbfce35012a [project @ 2008-01-15 01:04:06 by jwe] jwe parents: 7017 diff changeset	54 rgb = [rgb(:,:,1)(:), rgb(:,:,2)(:), rgb(:,:,3)(:)];
4fbfce35012a [project @ 2008-01-15 01:04:06 by jwe] jwe parents: 7017 diff changeset	55 ## Convert to a double image.
4fbfce35012a [project @ 2008-01-15 01:04:06 by jwe] jwe parents: 7017 diff changeset	56 if (isinteger (rgb))
15683 806ea52af230 Overhaul m-files in image directory to provide better support for images stored as integers. Rik <rik@octave.org> parents: 14260 diff changeset	57 low = double (intmin (cls));
806ea52af230 Overhaul m-files in image directory to provide better support for images stored as integers. Rik <rik@octave.org> parents: 14260 diff changeset	58 high = double (intmax (cls));
7375 4fbfce35012a [project @ 2008-01-15 01:04:06 by jwe] jwe parents: 7017 diff changeset	59 rgb = (double (rgb) - low) / (high - low);
4fbfce35012a [project @ 2008-01-15 01:04:06 by jwe] jwe parents: 7017 diff changeset	60 endif
4fbfce35012a [project @ 2008-01-15 01:04:06 by jwe] jwe parents: 7017 diff changeset	61 else
4fbfce35012a [project @ 2008-01-15 01:04:06 by jwe] jwe parents: 7017 diff changeset	62 is_image = false;
4fbfce35012a [project @ 2008-01-15 01:04:06 by jwe] jwe parents: 7017 diff changeset	63 endif
4fbfce35012a [project @ 2008-01-15 01:04:06 by jwe] jwe parents: 7017 diff changeset	64
15683 806ea52af230 Overhaul m-files in image directory to provide better support for images stored as integers. Rik <rik@octave.org> parents: 14260 diff changeset	65 if (! ismatrix (rgb) \|\| columns (rgb) != 3 \|\| issparse (rgb))
15714 b1cd65881592 Clean up scripts in image directory. Rik <rik@octave.org> parents: 15683 diff changeset	66 error ("rgb2hsv: input must be a matrix of size Nx3 or MxNx3");
3803 63c75bc3db82 [project @ 2001-02-28 08:24:40 by jwe] jwe parents: diff changeset	67 endif
63c75bc3db82 [project @ 2001-02-28 08:24:40 by jwe] jwe parents: diff changeset	68
15683 806ea52af230 Overhaul m-files in image directory to provide better support for images stored as integers. Rik <rik@octave.org> parents: 14260 diff changeset	69 ## get the max and min for each row
806ea52af230 Overhaul m-files in image directory to provide better support for images stored as integers. Rik <rik@octave.org> parents: 14260 diff changeset	70 s = min (rgb, [], 2);
806ea52af230 Overhaul m-files in image directory to provide better support for images stored as integers. Rik <rik@octave.org> parents: 14260 diff changeset	71 v = max (rgb, [], 2);
3803 63c75bc3db82 [project @ 2001-02-28 08:24:40 by jwe] jwe parents: diff changeset	72
3904 6b00ac653c0f [project @ 2002-04-24 04:56:10 by jwe] jwe parents: 3803 diff changeset	73 ## set hue to zero for undefined values (gray has no hue)
15683 806ea52af230 Overhaul m-files in image directory to provide better support for images stored as integers. Rik <rik@octave.org> parents: 14260 diff changeset	74 h = zeros (rows (rgb), 1);
3904 6b00ac653c0f [project @ 2002-04-24 04:56:10 by jwe] jwe parents: 3803 diff changeset	75 notgray = (s != v);
11587 c792872f8942 all script files: untabify and strip trailing whitespace John W. Eaton <jwe@octave.org> parents: 11523 diff changeset	76
3904 6b00ac653c0f [project @ 2002-04-24 04:56:10 by jwe] jwe parents: 3803 diff changeset	77 ## blue hue
6b00ac653c0f [project @ 2002-04-24 04:56:10 by jwe] jwe parents: 3803 diff changeset	78 idx = (v == rgb(:,3) & notgray);
6b00ac653c0f [project @ 2002-04-24 04:56:10 by jwe] jwe parents: 3803 diff changeset	79 if (any (idx))
6b00ac653c0f [project @ 2002-04-24 04:56:10 by jwe] jwe parents: 3803 diff changeset	80 h(idx) = 2/3 + 1/6 * (rgb(idx,1) - rgb(idx,2)) ./ (v(idx) - s(idx));
6b00ac653c0f [project @ 2002-04-24 04:56:10 by jwe] jwe parents: 3803 diff changeset	81 endif
3803 63c75bc3db82 [project @ 2001-02-28 08:24:40 by jwe] jwe parents: diff changeset	82
3904 6b00ac653c0f [project @ 2002-04-24 04:56:10 by jwe] jwe parents: 3803 diff changeset	83 ## green hue
6b00ac653c0f [project @ 2002-04-24 04:56:10 by jwe] jwe parents: 3803 diff changeset	84 idx = (v == rgb(:,2) & notgray);
6b00ac653c0f [project @ 2002-04-24 04:56:10 by jwe] jwe parents: 3803 diff changeset	85 if (any (idx))
6b00ac653c0f [project @ 2002-04-24 04:56:10 by jwe] jwe parents: 3803 diff changeset	86 h(idx) = 1/3 + 1/6 * (rgb(idx,3) - rgb(idx,1)) ./ (v(idx) - s(idx));
6b00ac653c0f [project @ 2002-04-24 04:56:10 by jwe] jwe parents: 3803 diff changeset	87 endif
3803 63c75bc3db82 [project @ 2001-02-28 08:24:40 by jwe] jwe parents: diff changeset	88
3904 6b00ac653c0f [project @ 2002-04-24 04:56:10 by jwe] jwe parents: 3803 diff changeset	89 ## red hue
6b00ac653c0f [project @ 2002-04-24 04:56:10 by jwe] jwe parents: 3803 diff changeset	90 idx = (v == rgb(:,1) & notgray);
6b00ac653c0f [project @ 2002-04-24 04:56:10 by jwe] jwe parents: 3803 diff changeset	91 if (any (idx))
6b00ac653c0f [project @ 2002-04-24 04:56:10 by jwe] jwe parents: 3803 diff changeset	92 h(idx) = 1/6 * (rgb(idx,2) - rgb(idx,3)) ./ (v(idx) - s(idx));
6b00ac653c0f [project @ 2002-04-24 04:56:10 by jwe] jwe parents: 3803 diff changeset	93 endif
15683 806ea52af230 Overhaul m-files in image directory to provide better support for images stored as integers. Rik <rik@octave.org> parents: 14260 diff changeset	94 h(h < 0) += 1; # correct for negative red
3803 63c75bc3db82 [project @ 2001-02-28 08:24:40 by jwe] jwe parents: diff changeset	95
3904 6b00ac653c0f [project @ 2002-04-24 04:56:10 by jwe] jwe parents: 3803 diff changeset	96 ## set the saturation
6b00ac653c0f [project @ 2002-04-24 04:56:10 by jwe] jwe parents: 3803 diff changeset	97 s(! notgray) = 0;
6b00ac653c0f [project @ 2002-04-24 04:56:10 by jwe] jwe parents: 3803 diff changeset	98 s(notgray) = 1 - s(notgray) ./ v(notgray);
3803 63c75bc3db82 [project @ 2001-02-28 08:24:40 by jwe] jwe parents: diff changeset	99
11469 c776f063fefe Overhaul m-script files to use common variable name between code and documentation. Rik <octave@nomad.inbox5.com> parents: 10791 diff changeset	100 hsv_map = [h, s, v];
11587 c792872f8942 all script files: untabify and strip trailing whitespace John W. Eaton <jwe@octave.org> parents: 11523 diff changeset	101
15714 b1cd65881592 Clean up scripts in image directory. Rik <rik@octave.org> parents: 15683 diff changeset	102 ## FIXME: rgb2hsv does not preserve class of image.
b1cd65881592 Clean up scripts in image directory. Rik <rik@octave.org> parents: 15683 diff changeset	103 ## Should it also convert back to uint8, uint16 for integer images?
7375 4fbfce35012a [project @ 2008-01-15 01:04:06 by jwe] jwe parents: 7017 diff changeset	104 ## If input was an image, convert it back into one.
4fbfce35012a [project @ 2008-01-15 01:04:06 by jwe] jwe parents: 7017 diff changeset	105 if (is_image)
15683 806ea52af230 Overhaul m-files in image directory to provide better support for images stored as integers. Rik <rik@octave.org> parents: 14260 diff changeset	106 hsv_map = reshape (hsv_map, sz);
7375 4fbfce35012a [project @ 2008-01-15 01:04:06 by jwe] jwe parents: 7017 diff changeset	107 endif
3803 63c75bc3db82 [project @ 2001-02-28 08:24:40 by jwe] jwe parents: diff changeset	108
63c75bc3db82 [project @ 2001-02-28 08:24:40 by jwe] jwe parents: diff changeset	109 endfunction
15683 806ea52af230 Overhaul m-files in image directory to provide better support for images stored as integers. Rik <rik@octave.org> parents: 14260 diff changeset	110
806ea52af230 Overhaul m-files in image directory to provide better support for images stored as integers. Rik <rik@octave.org> parents: 14260 diff changeset	111
806ea52af230 Overhaul m-files in image directory to provide better support for images stored as integers. Rik <rik@octave.org> parents: 14260 diff changeset	112 %% Test pure colors and gray
806ea52af230 Overhaul m-files in image directory to provide better support for images stored as integers. Rik <rik@octave.org> parents: 14260 diff changeset	113 %!assert (rgb2hsv ([1 0 0]), [0 1 1])
806ea52af230 Overhaul m-files in image directory to provide better support for images stored as integers. Rik <rik@octave.org> parents: 14260 diff changeset	114 %!assert (rgb2hsv ([0 1 0]), [1/3 1 1])
806ea52af230 Overhaul m-files in image directory to provide better support for images stored as integers. Rik <rik@octave.org> parents: 14260 diff changeset	115 %!assert (rgb2hsv ([0 0 1]), [2/3 1 1])
806ea52af230 Overhaul m-files in image directory to provide better support for images stored as integers. Rik <rik@octave.org> parents: 14260 diff changeset	116 %!assert (rgb2hsv ([0.5 0.5 0.5]), [0 0 0.5])
806ea52af230 Overhaul m-files in image directory to provide better support for images stored as integers. Rik <rik@octave.org> parents: 14260 diff changeset	117
806ea52af230 Overhaul m-files in image directory to provide better support for images stored as integers. Rik <rik@octave.org> parents: 14260 diff changeset	118 %!test
806ea52af230 Overhaul m-files in image directory to provide better support for images stored as integers. Rik <rik@octave.org> parents: 14260 diff changeset	119 %! rgb_map = rand (64, 3);
806ea52af230 Overhaul m-files in image directory to provide better support for images stored as integers. Rik <rik@octave.org> parents: 14260 diff changeset	120 %! assert (hsv2rgb (rgb2hsv (rgb_map)), rgb_map, 1e-6);
806ea52af230 Overhaul m-files in image directory to provide better support for images stored as integers. Rik <rik@octave.org> parents: 14260 diff changeset	121
806ea52af230 Overhaul m-files in image directory to provide better support for images stored as integers. Rik <rik@octave.org> parents: 14260 diff changeset	122 %!test
806ea52af230 Overhaul m-files in image directory to provide better support for images stored as integers. Rik <rik@octave.org> parents: 14260 diff changeset	123 %! rgb_img = rand (64, 64, 3);
806ea52af230 Overhaul m-files in image directory to provide better support for images stored as integers. Rik <rik@octave.org> parents: 14260 diff changeset	124 %! assert (hsv2rgb (rgb2hsv (rgb_img)), rgb_img, 1e-6);
806ea52af230 Overhaul m-files in image directory to provide better support for images stored as integers. Rik <rik@octave.org> parents: 14260 diff changeset	125
806ea52af230 Overhaul m-files in image directory to provide better support for images stored as integers. Rik <rik@octave.org> parents: 14260 diff changeset	126 %% Test input validation
806ea52af230 Overhaul m-files in image directory to provide better support for images stored as integers. Rik <rik@octave.org> parents: 14260 diff changeset	127 %!error rgb2hsv ()
806ea52af230 Overhaul m-files in image directory to provide better support for images stored as integers. Rik <rik@octave.org> parents: 14260 diff changeset	128 %!error rgb2hsv (1,2)
806ea52af230 Overhaul m-files in image directory to provide better support for images stored as integers. Rik <rik@octave.org> parents: 14260 diff changeset	129 %!error <invalid data type 'cell'> rgb2hsv ({1})
806ea52af230 Overhaul m-files in image directory to provide better support for images stored as integers. Rik <rik@octave.org> parents: 14260 diff changeset	130 %!error <must be a matrix of size Nx3> rgb2hsv (ones (2,2))
806ea52af230 Overhaul m-files in image directory to provide better support for images stored as integers. Rik <rik@octave.org> parents: 14260 diff changeset	131

Mercurial > hg > octave-lyh

annotate scripts/image/rgb2hsv.m @ 17535:c12c688a35ed default tip lyh