Mercurial > hg > octave-nkf

annotate scripts/image/imread.m @ 9382:ab563d2adc10

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
image/imread.m Test added.
author Alexander Mamonov <mamonov@gmail.com>
date Tue, 23 Jun 2009 14:41:03 -0400
parents a9c4aece8c2a
children ac2617d4e30c
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
8920
eb63fbe60fab update copyright notices
John W. Eaton <jwe@octave.org>
parents: 8664
diff changeset
1 ## Copyright (C) 2008, 2009 Thomas L. Scofield <scofield@calvin.edu>
eb63fbe60fab update copyright notices
John W. Eaton <jwe@octave.org>
parents: 8664
diff changeset
2 ## Copyright (C) 2008 Kristian Rumberg <kristianrumberg@gmail.com>
7925
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
3 ## Copyright (C) 2006 Thomas Weber <thomas.weber.mail@gmail.com>
8920
eb63fbe60fab update copyright notices
John W. Eaton <jwe@octave.org>
parents: 8664
diff changeset
4 ## Copyright (C) 2005 Stefan van der Walt <stefan@sun.ac.za>
eb63fbe60fab update copyright notices
John W. Eaton <jwe@octave.org>
parents: 8664
diff changeset
5 ## Copyright (C) 2002 Andy Adler
7925
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
6 ##
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
7 ## This file is part of Octave.
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
8 ##
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
9 ## Octave is free software; you can redistribute it and/or modify it
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
10 ## under the terms of the GNU General Public License as published by
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
11 ## the Free Software Foundation; either version 3 of the License, or (at
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
12 ## your option) any later version.
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
13 ##
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
14 ## Octave is distributed in the hope that it will be useful, but
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
15 ## WITHOUT ANY WARRANTY; without even the implied warranty of
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
16 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
17 ## General Public License for more details.
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
18 ##
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
19 ## You should have received a copy of the GNU General Public License
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
20 ## along with Octave; see the file COPYING. If not, see
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
21 ## <http://www.gnu.org/licenses/>.
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
22
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
23 ## -*- texinfo -*-
7931
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
24 ## @deftypefn {Function File} {[@var{img}, @var{map}, @var{alpha}] =} imread (@var{filename})
7925
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
25 ## Read images from various file formats.
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
26 ##
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
27 ## The size and numeric class of the output depends on the
9072
bd8e388043c4 Cleanup documentation for signal.texi, image.texi, audio.texi
Rik <rdrider0-list@yahoo.com>
parents: 8920
diff changeset
28 ## format of the image. A color image is returned as an
7925
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
29 ## MxNx3 matrix. Grey-level and black-and-white images are
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
30 ## of size MxN.
9072
bd8e388043c4 Cleanup documentation for signal.texi, image.texi, audio.texi
Rik <rdrider0-list@yahoo.com>
parents: 8920
diff changeset
31 ## The color depth of the image determines the numeric
7931
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
32 ## class of the output: "uint8" or "uint16" for grey
9072
bd8e388043c4 Cleanup documentation for signal.texi, image.texi, audio.texi
Rik <rdrider0-list@yahoo.com>
parents: 8920
diff changeset
33 ## and color, and "logical" for black and white.
8148
213dd524f96b Improve documentation for image I/O.
sh@sh-laptop
parents: 7931
diff changeset
34 ##
213dd524f96b Improve documentation for image I/O.
sh@sh-laptop
parents: 7931
diff changeset
35 ## @seealso{imwrite, imfinfo}
7925
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
36 ## @end deftypefn
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
37
7931
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
38 function varargout = imread (filename, varargin)
7925
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
39
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
40 if (nargin < 1)
7931
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
41 print_usage ();
7925
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
42 endif
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
43
7931
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
44 if (! ischar (filename))
8664
e07e93c04080 style fixes
John W. Eaton <jwe@octave.org>
parents: 8507
diff changeset
45 error ("imread: filename must be a string");
7925
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
46 endif
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
47
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
48 filename = tilde_expand (filename);
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
49
7931
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
50 fn = file_in_path (IMAGE_PATH, filename);
7925
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
51
7931
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
52 if (isempty (fn))
8507
cadc73247d65 style fixes
John W. Eaton <jwe@octave.org>
parents: 8148
diff changeset
53 error ("imread: cannot find %s", filename);
7925
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
54 endif
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
55
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
56 try
7931
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
57 [varargout{1:nargout}] = __magick_read__ (fn, varargin{:});
7925
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
58 catch
7931
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
59
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
60 magick_error = lasterr ();
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
61
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
62 img_field = false;
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
63 x_field = false;
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
64 map_field = false;
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
65
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
66 try
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
67 vars = load (fn);
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
68 if (isstruct (vars))
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
69 img_field = isfield (vars, "img");
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
70 x_field = isfield (vars, "X");
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
71 map_field = isfield (vars, "map");
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
72 endif
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
73 catch
8664
e07e93c04080 style fixes
John W. Eaton <jwe@octave.org>
parents: 8507
diff changeset
74 error ("imread: invalid image file: %s", magick_error);
7931
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
75 end_try_catch
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
76
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
77 if (map_field && (img_field || x_field))
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
78 varargout{2} = vars.map;
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
79 if (img_field)
9268
a9c4aece8c2a Backed out changeset 7f3a1a90f4f4
Jaroslav Hajek <highegg@gmail.com>
parents: 9265
diff changeset
80 varargout{1} = vars.img;
7931
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
81 else
9268
a9c4aece8c2a Backed out changeset 7f3a1a90f4f4
Jaroslav Hajek <highegg@gmail.com>
parents: 9265
diff changeset
82 varargout{1} = vars.X;
7931
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
83 endif
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
84 else
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
85 error ("imread: invalid Octave image file format");
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
86 endif
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
87
7925
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
88 end_try_catch
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
89
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
90 endfunction
9382
ab563d2adc10 image/imread.m Test added.
Alexander Mamonov <mamonov@gmail.com>
parents: 9268
diff changeset
91
ab563d2adc10 image/imread.m Test added.
Alexander Mamonov <mamonov@gmail.com>
parents: 9268
diff changeset
92 %!test
ab563d2adc10 image/imread.m Test added.
Alexander Mamonov <mamonov@gmail.com>
parents: 9268
diff changeset
93 %! vpng = [ ...
ab563d2adc10 image/imread.m Test added.
Alexander Mamonov <mamonov@gmail.com>
parents: 9268
diff changeset
94 %! 137, 80, 78, 71, 13, 10, 26, 10, 0, 0, ...
ab563d2adc10 image/imread.m Test added.
Alexander Mamonov <mamonov@gmail.com>
parents: 9268
diff changeset
95 %! 0, 13, 73, 72, 68, 82, 0, 0, 0, 3, ...
ab563d2adc10 image/imread.m Test added.
Alexander Mamonov <mamonov@gmail.com>
parents: 9268
diff changeset
96 %! 0, 0, 0, 3, 8, 2, 0, 0, 0, 217, ...
ab563d2adc10 image/imread.m Test added.
Alexander Mamonov <mamonov@gmail.com>
parents: 9268
diff changeset
97 %! 74, 34, 232, 0, 0, 0, 1, 115, 82, 71, ...
ab563d2adc10 image/imread.m Test added.
Alexander Mamonov <mamonov@gmail.com>
parents: 9268
diff changeset
98 %! 66, 0, 174, 206, 28, 233, 0, 0, 0, 4, ...
ab563d2adc10 image/imread.m Test added.
Alexander Mamonov <mamonov@gmail.com>
parents: 9268
diff changeset
99 %! 103, 65, 77, 65, 0, 0, 177, 143, 11, 252, ...
ab563d2adc10 image/imread.m Test added.
Alexander Mamonov <mamonov@gmail.com>
parents: 9268
diff changeset
100 %! 97, 5, 0, 0, 0, 32, 99, 72, 82, 77, ...
ab563d2adc10 image/imread.m Test added.
Alexander Mamonov <mamonov@gmail.com>
parents: 9268
diff changeset
101 %! 0, 0, 122, 38, 0, 0, 128, 132, 0, 0, ...
ab563d2adc10 image/imread.m Test added.
Alexander Mamonov <mamonov@gmail.com>
parents: 9268
diff changeset
102 %! 250, 0, 0, 0, 128, 232, 0, 0, 117, 48, ...
ab563d2adc10 image/imread.m Test added.
Alexander Mamonov <mamonov@gmail.com>
parents: 9268
diff changeset
103 %! 0, 0, 234, 96, 0, 0, 58, 152, 0, 0, ...
ab563d2adc10 image/imread.m Test added.
Alexander Mamonov <mamonov@gmail.com>
parents: 9268
diff changeset
104 %! 23, 112, 156, 186, 81, 60, 0, 0, 0, 25, ...
ab563d2adc10 image/imread.m Test added.
Alexander Mamonov <mamonov@gmail.com>
parents: 9268
diff changeset
105 %! 73, 68, 65, 84, 24, 87, 99, 96, 96, 96, ...
ab563d2adc10 image/imread.m Test added.
Alexander Mamonov <mamonov@gmail.com>
parents: 9268
diff changeset
106 %! 248, 255, 255, 63, 144, 4, 81, 111, 101, 84, ...
ab563d2adc10 image/imread.m Test added.
Alexander Mamonov <mamonov@gmail.com>
parents: 9268
diff changeset
107 %! 16, 28, 160, 16, 0, 197, 214, 13, 34, 74, ...
ab563d2adc10 image/imread.m Test added.
Alexander Mamonov <mamonov@gmail.com>
parents: 9268
diff changeset
108 %! 117, 213, 17, 0, 0, 0, 0, 73, 69, 78, ...
ab563d2adc10 image/imread.m Test added.
Alexander Mamonov <mamonov@gmail.com>
parents: 9268
diff changeset
109 %! 68, 174, 66, 96, 130];
ab563d2adc10 image/imread.m Test added.
Alexander Mamonov <mamonov@gmail.com>
parents: 9268
diff changeset
110 %! fid = fopen('test.png', 'wb');
ab563d2adc10 image/imread.m Test added.
Alexander Mamonov <mamonov@gmail.com>
parents: 9268
diff changeset
111 %! fwrite(fid, vpng);
ab563d2adc10 image/imread.m Test added.
Alexander Mamonov <mamonov@gmail.com>
parents: 9268
diff changeset
112 %! fclose(fid);
ab563d2adc10 image/imread.m Test added.
Alexander Mamonov <mamonov@gmail.com>
parents: 9268
diff changeset
113 %! A = imread('test.png');
ab563d2adc10 image/imread.m Test added.
Alexander Mamonov <mamonov@gmail.com>
parents: 9268
diff changeset
114 %! delete('test.png');
ab563d2adc10 image/imread.m Test added.
Alexander Mamonov <mamonov@gmail.com>
parents: 9268
diff changeset
115 %! assert(A(:,:,1), [0, 255, 0; 255, 237, 255; 0, 255, 0]);
ab563d2adc10 image/imread.m Test added.
Alexander Mamonov <mamonov@gmail.com>
parents: 9268
diff changeset
116 %! assert(A(:,:,2), [0, 255, 0; 255, 28, 255; 0, 255, 0]);
ab563d2adc10 image/imread.m Test added.
Alexander Mamonov <mamonov@gmail.com>
parents: 9268
diff changeset
117 %! assert(A(:,:,3), [0, 255, 0; 255, 36, 255; 0, 255, 0]);