Mercurial > hg > octave-lyh

annotate scripts/image/imread.m @ 7931:de26beacb20f

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
imread.m: simplify; loadimage.m: deprecate
author John W. Eaton <jwe@octave.org>
date Wed, 16 Jul 2008 12:55:48 -0400
parents 9316b59903c9
children 213dd524f96b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
7925
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
1 ## Copyright (C) 2002 Andy Adler
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
2 ## Copyright (C) 2005 Stefan van der Walt <stefan@sun.ac.za>
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>
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
4 ## Copyright (C) 2008 Kristian Rumberg <kristianrumberg@gmail.com>
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
5 ## Copyright (C) 2008 Thomas L. Scofield <scofield@calvin.edu>
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
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
28 ## format of the image. A colour image is returned as an
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.
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
31 ## The colour 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
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
33 ## and colour, and "logical" for black and white.
7925
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
34 ## @end deftypefn
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
35
7931
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
36 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
37
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
38 if (nargin < 1)
7931
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
39 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
40 endif
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
41
7931
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
42 if (! ischar (filename))
7925
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
43 error ("imread: filename must be a string")
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
44 endif
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
45
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
46 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
47
7931
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
48 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
49
7931
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
50 if (isempty (fn))
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
51 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
52 endif
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
53
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
54 try
7931
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
55 [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
56 catch
7931
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
57
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
58 magick_error = lasterr ();
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 img_field = false;
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
61 x_field = false;
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
62 map_field = false;
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
63
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
64 try
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
65 vars = load (fn);
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
66 if (isstruct (vars))
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
67 img_field = isfield (vars, "img");
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
68 x_field = isfield (vars, "X");
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
69 map_field = isfield (vars, "map");
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
70 endif
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
71 catch
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
72 error ("imread: invalid image file: %s", magick_error)
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
73 end_try_catch
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
74
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
75 if (map_field && (img_field || x_field))
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
76 varargout{2} = vars.map;
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
77 if (img_field)
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
78 varargout{1} = vars.img;
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
79 else
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
80 varargout{1} = vars.X;
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
81 endif
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
82 else
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
83 error ("imread: invalid Octave image file format");
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
84 endif
de26beacb20f imread.m: simplify; loadimage.m: deprecate
John W. Eaton <jwe@octave.org>
parents: 7925
diff changeset
85
7925
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
86 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
87
9316b59903c9 Add original imread() files (from octave-forge) to core octave.
Thomas L. Scofield <scofield AT calvin DOT edu>
parents:
diff changeset
88 endfunction