Mercurial > octave-antonio
annotate scripts/image/imread.m @ 17171:c3bd7314643c
doc: Periodic spellcheck of documentation.
* doc/interpreter/doccheck/aspell-octave.en.pws: Add new words to
Octave-specific dictionary.
* scripts/miscellaneous/edit.m: Use @nospell macro to stop spellchecking code
samples.
* scripts/image/imread.m, scripts/image/imwrite.m,
scripts/linear-algebra/cond.m, scripts/plot/orient.m: Periodic spellcheck of
documentation.
author | Rik <rik@octave.org> |
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date | Sun, 04 Aug 2013 13:22:53 -0700 |
parents | d6499c14021c |
children | bc924baa2c4e |
rev | line source |
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1 ## Copyright (C) 2013 Carnë Draug |
16768 | 2 ## Copyright (C) 2008-2012 Thomas L. Scofield |
3 ## Copyright (C) 2008 Kristian Rumberg | |
4 ## Copyright (C) 2006 Thomas Weber | |
5 ## Copyright (C) 2005 Stefan van der Walt | |
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7 ## |
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8 ## This file is part of Octave. |
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9 ## |
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10 ## Octave is free software; you can redistribute it and/or modify it |
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11 ## under the terms of the GNU General Public License as published by |
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12 ## the Free Software Foundation; either version 3 of the License, or (at |
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13 ## your option) any later version. |
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14 ## |
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15 ## Octave is distributed in the hope that it will be useful, but |
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16 ## WITHOUT ANY WARRANTY; without even the implied warranty of |
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17 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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18 ## General Public License for more details. |
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19 ## |
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20 ## You should have received a copy of the GNU General Public License |
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21 ## along with Octave; see the file COPYING. If not, see |
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22 ## <http://www.gnu.org/licenses/>. |
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23 |
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24 ## -*- texinfo -*- |
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25 ## @deftypefn {Function File} {[@var{img}, @var{map}, @var{alpha}] =} imread (@var{filename}) |
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26 ## @deftypefnx {Function File} {[@dots{}] =} imread (@var{filename}, @var{ext}) |
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27 ## @deftypefnx {Function File} {[@dots{}] =} imread (@var{url}) |
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28 ## @deftypefnx {Function File} {[@dots{}] =} imread (@dots{}, @var{idx}) |
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29 ## @deftypefnx {Function File} {[@dots{}] =} imread (@dots{}, @var{param1}, @var{val1}, @dots{}) |
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30 ## Read images from various file formats. |
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31 ## |
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32 ## Reads an image as a matrix from the file @var{filename}. If there is |
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33 ## no file @var{filename}, and @var{ext} was specified, it will look for |
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34 ## a file named @var{filename} and extension @var{ext}, i.e., a file named |
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35 ## @var{filename}.@var{ext}. |
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36 ## |
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37 ## The size and class of the output depends on the |
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38 ## format of the image. A color image is returned as an |
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39 ## @nospell{MxNx3} matrix. Gray-level and black-and-white images are |
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40 ## of size @nospell{MxN}. Multipage images will have an additional 4th |
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41 ## dimension. |
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42 ## The bit depth of the image determines the |
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43 ## class of the output: "uint8" or "uint16" for gray |
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44 ## and color, and "logical" for black and white. |
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45 ## Note that indexed images always return the indexes for a colormap, |
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46 ## independent if @var{map} is a requested output. To obtain the actual |
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47 ## RGB image, use @code{ind2rgb}. |
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48 ## See the Octave manual for more information in representing images. |
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49 ## |
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50 ## Some file formats, such as TIFF and GIF, are able to store multiple |
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51 ## images in a single file. @var{idx} can be a scalar or vector |
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52 ## specifying the index of the images to read. By default, Octave |
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53 ## will only read the first page. |
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55 ## Depending on the file format, it is possible to configure the reading |
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56 ## of images with @var{param}, @var{val} pairs. The following options |
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57 ## are supported: |
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58 ## |
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59 ## @table @samp |
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60 ## @item "Frames" or "Index" |
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61 ## This is an alternative method to specify @var{idx}. When specifying it |
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62 ## in this way, its value can also be the string "all". |
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63 ## |
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64 ## @item "Info" |
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65 ## This option exists for @sc{matlab} compatibility and has no effect. For |
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66 ## maximum performance while reading multiple images from a single file, |
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67 ## use the Index option. |
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68 ## |
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69 ## @item "PixelRegion" |
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70 ## Controls the image region that is read. Takes as value a cell array |
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71 ## with two arrays of 3 elements @code{@{@var{rows} @var{cols}@}}. The |
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72 ## elements in the array are the start, increment and end pixel to be |
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73 ## read. If the increment value is omitted, defaults to 1. |
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74 ## @end table |
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75 ## |
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76 ## @seealso{imwrite, imfinfo, imformats} |
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77 ## @end deftypefn |
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78 |
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79 ## Author: Carnë Draug <carandraug@octave.org> |
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80 ## Author: Thomas L. Scofield <scofield@calvin.edu> |
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81 ## Author: Kristian Rumberg <kristianrumberg@gmail.com> |
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82 ## Author: Thomas Weber <thomas.weber.mail@gmail.com> |
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83 ## Author: Stefan van der Walt <stefan@sun.ac.za> |
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84 ## Author: Andy Adler |
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85 |
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86 function varargout = imread (varargin) |
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87 if (nargin < 1) |
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88 print_usage (); |
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89 elseif (! ischar (varargin{1})) |
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90 error ("imread: FILENAME must be a string"); |
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91 endif |
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92 ## In case the file format was specified as a separate argument we |
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93 ## do this. imageIO() will ignore the second part if filename on its |
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94 ## own is enough. And if the second argument was a parameter name instead |
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95 ## of an extension, it is still going to be passed to the next function |
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96 ## since we are passing the whole function input as well. |
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97 filename = {varargin{1}}; |
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98 if (nargin > 1 && ischar (varargin {2})) |
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99 filename{2} = varargin{2}; |
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100 endif |
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101 |
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102 [varargout{1:nargout}] = imageIO (@__imread__, "read", filename, varargin{:}); |
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103 endfunction |
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104 |
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105 %!testif HAVE_MAGICK |
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106 %! vpng = [ ... |
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107 %! 137, 80, 78, 71, 13, 10, 26, 10, 0, 0, ... |
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108 %! 0, 13, 73, 72, 68, 82, 0, 0, 0, 3, ... |
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109 %! 0, 0, 0, 3, 8, 2, 0, 0, 0, 217, ... |
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Alexander Mamonov <mamonov@gmail.com>
parents:
9268
diff
changeset
|
110 %! 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
|
111 %! 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
|
112 %! 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
|
113 %! 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
|
114 %! 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
|
115 %! 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
|
116 %! 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
|
117 %! 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
|
118 %! 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
|
119 %! 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
|
120 %! 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
|
121 %! 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
|
122 %! 68, 174, 66, 96, 130]; |
16967
52c1b832d98e
imread: make sure test file is removed if imread() errors.
Carnë Draug <carandraug@octave.org>
parents:
16962
diff
changeset
|
123 %! filename = [tmpnam() ".png"]; |
52c1b832d98e
imread: make sure test file is removed if imread() errors.
Carnë Draug <carandraug@octave.org>
parents:
16962
diff
changeset
|
124 %! unwind_protect |
52c1b832d98e
imread: make sure test file is removed if imread() errors.
Carnë Draug <carandraug@octave.org>
parents:
16962
diff
changeset
|
125 %! fid = fopen (filename, "wb"); |
52c1b832d98e
imread: make sure test file is removed if imread() errors.
Carnë Draug <carandraug@octave.org>
parents:
16962
diff
changeset
|
126 %! fwrite (fid, vpng); |
52c1b832d98e
imread: make sure test file is removed if imread() errors.
Carnë Draug <carandraug@octave.org>
parents:
16962
diff
changeset
|
127 %! fclose (fid); |
52c1b832d98e
imread: make sure test file is removed if imread() errors.
Carnë Draug <carandraug@octave.org>
parents:
16962
diff
changeset
|
128 %! A = imread (filename); |
52c1b832d98e
imread: make sure test file is removed if imread() errors.
Carnë Draug <carandraug@octave.org>
parents:
16962
diff
changeset
|
129 %! unwind_protect_cleanup |
52c1b832d98e
imread: make sure test file is removed if imread() errors.
Carnë Draug <carandraug@octave.org>
parents:
16962
diff
changeset
|
130 %! unlink (filename); |
52c1b832d98e
imread: make sure test file is removed if imread() errors.
Carnë Draug <carandraug@octave.org>
parents:
16962
diff
changeset
|
131 %! end_unwind_protect |
14363
f3d52523cde1
Use Octave coding conventions in all m-file %!test blocks
Rik <octave@nomad.inbox5.com>
parents:
14138
diff
changeset
|
132 %! assert (A(:,:,1), uint8 ([0, 255, 0; 255, 237, 255; 0, 255, 0])); |
f3d52523cde1
Use Octave coding conventions in all m-file %!test blocks
Rik <octave@nomad.inbox5.com>
parents:
14138
diff
changeset
|
133 %! assert (A(:,:,2), uint8 ([0, 255, 0; 255, 28, 255; 0, 255, 0])); |
f3d52523cde1
Use Octave coding conventions in all m-file %!test blocks
Rik <octave@nomad.inbox5.com>
parents:
14138
diff
changeset
|
134 %! assert (A(:,:,3), uint8 ([0, 255, 0; 255, 36, 255; 0, 255, 0])); |
f3d52523cde1
Use Octave coding conventions in all m-file %!test blocks
Rik <octave@nomad.inbox5.com>
parents:
14138
diff
changeset
|
135 |