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gallery.m: clean and vectorize part of qmult. * scripts/special-matrix/gallery.m: make qmult() follow Octave guidelines, vectorize last for loop in qmult().
author Antonio Pino Robles <data.script93@gmail.com>
date Thu, 28 May 2015 18:32:47 +0200
parents 9fc020886ae9
children 7503499a252b
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 ## Copyright (C) 2013-2015 Carnë Draug
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2 ## Copyright (C) 2008-2015 Thomas L. Scofield
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3 ## Copyright (C) 2008 Kristian Rumberg
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4 ## Copyright (C) 2006 Thomas Weber
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5 ## Copyright (C) 2005 Stefan van der Walt
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6 ## Copyright (C) 2002 Andy Adler
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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{url})
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27 ## @deftypefnx {Function File} {[@dots{}] =} imread (@dots{}, @var{ext})
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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 with the extension @var{ext}. Finally, it will attempt to download
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35 ## and read an image from @var{url}.
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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 ##
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43 ## The bit depth of the image determines the
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44 ## class of the output: @qcode{"uint8"}, @qcode{"uint16"} or @qcode{"single"}
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45 ## for gray and color, and @qcode{"logical"} for black and white.
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46 ## Note that indexed images always return the indexes for a colormap,
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47 ## independent if @var{map} is a requested output. To obtain the actual
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48 ## RGB image, use @code{ind2rgb}. When more than one indexed image is being
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49 ## read, @var{map} is obtained from the first. In some rare cases this
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50 ## may be incorrect and @code{imfinfo} can be used to obtain the colormap of
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51 ## each image.
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52 ##
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53 ## See the Octave manual for more information in representing images.
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54 ##
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55 ## Some file formats, such as TIFF and GIF, are able to store multiple
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56 ## images in a single file. @var{idx} can be a scalar or vector
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57 ## specifying the index of the images to read. By default, Octave
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58 ## will only read the first page.
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59 ##
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60 ## Depending on the file format, it is possible to configure the reading
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61 ## of images with @var{param}, @var{val} pairs. The following options
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62 ## are supported:
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63 ##
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64 ## @table @samp
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65 ## @item @qcode{"Frames"} or @qcode{"Index"}
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66 ## This is an alternative method to specify @var{idx}. When specifying it
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67 ## in this way, its value can also be the string @qcode{"all"}.
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68 ##
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69 ## @item @qcode{"Info"}
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70 ## This option exists for @sc{matlab} compatibility and has no effect. For
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71 ## maximum performance while reading multiple images from a single file,
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72 ## use the Index option.
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73 ##
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74 ## @item @qcode{"PixelRegion"}
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75 ## Controls the image region that is read. Takes as value a cell array
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76 ## with two arrays of 3 elements @code{@{@var{rows} @var{cols}@}}. The
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77 ## elements in the array are the start, increment and end pixel to be
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78 ## read. If the increment value is omitted, defaults to 1. For example,
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79 ## the following are all equivalent:
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80 ##
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81 ## @example
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82 ## @group
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83 ## imread (filename, "PixelRegion", @{[200 600] [300 700]@});
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84 ## imread (filename, "PixelRegion", @{[200 1 600] [300 1 700]@});
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85 ## imread (filename)(200:600, 300:700);
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86 ## @end group
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87 ## @end example
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88 ##
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89 ## @end table
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90 ##
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91 ## @seealso{imwrite, imfinfo, imformats}
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92 ## @end deftypefn
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93
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94 ## Author: Carnë Draug <carandraug@octave.org>
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95 ## Author: Thomas L. Scofield <scofield@calvin.edu>
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96 ## Author: Kristian Rumberg <kristianrumberg@gmail.com>
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97 ## Author: Thomas Weber <thomas.weber.mail@gmail.com>
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98 ## Author: Stefan van der Walt <stefan@sun.ac.za>
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99 ## Author: Andy Adler
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100
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101 function [img, varargout] = imread (filename, varargin)
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102 if (nargin < 1)
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103 print_usage ();
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104 elseif (! ischar (filename))
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105 error ("imread: FILENAME must be a string");
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106 endif
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107
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108 [img, varargout{1:nargout-1}] = ...
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109 imageIO ("imread", @__imread__, "read", filename, varargin{:});
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110
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111 endfunction
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112
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113
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114 %!testif HAVE_MAGICK
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115 %! vpng = [ ...
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116 %! 137, 80, 78, 71, 13, 10, 26, 10, 0, 0, ...
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parents: 9268
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121 %! 103, 65, 77, 65, 0, 0, 177, 143, 11, 252, ...
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parents: 9268
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122 %! 97, 5, 0, 0, 0, 32, 99, 72, 82, 77, ...
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parents: 9268
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123 %! 0, 0, 122, 38, 0, 0, 128, 132, 0, 0, ...
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Alexander Mamonov <mamonov@gmail.com>
parents: 9268
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124 %! 250, 0, 0, 0, 128, 232, 0, 0, 117, 48, ...
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parents: 9268
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125 %! 0, 0, 234, 96, 0, 0, 58, 152, 0, 0, ...
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parents: 9268
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126 %! 23, 112, 156, 186, 81, 60, 0, 0, 0, 25, ...
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parents: 9268
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127 %! 73, 68, 65, 84, 24, 87, 99, 96, 96, 96, ...
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Alexander Mamonov <mamonov@gmail.com>
parents: 9268
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128 %! 248, 255, 255, 63, 144, 4, 81, 111, 101, 84, ...
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parents: 9268
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129 %! 16, 28, 160, 16, 0, 197, 214, 13, 34, 74, ...
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Alexander Mamonov <mamonov@gmail.com>
parents: 9268
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130 %! 117, 213, 17, 0, 0, 0, 0, 73, 69, 78, ...
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Alexander Mamonov <mamonov@gmail.com>
parents: 9268
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131 %! 68, 174, 66, 96, 130];
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132 %! filename = [tempname() ".png"];
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133 %! unwind_protect
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134 %! fid = fopen (filename, "wb");
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135 %! fwrite (fid, vpng);
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136 %! fclose (fid);
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137 %! A = imread (filename);
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138 %! unwind_protect_cleanup
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139 %! unlink (filename);
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140 %! end_unwind_protect
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Rik <octave@nomad.inbox5.com>
parents: 14138
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141 %! assert (A(:,:,1), uint8 ([0, 255, 0; 255, 237, 255; 0, 255, 0]));
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142 %! assert (A(:,:,2), uint8 ([0, 255, 0; 255, 28, 255; 0, 255, 0]));
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143 %! assert (A(:,:,3), uint8 ([0, 255, 0; 255, 36, 255; 0, 255, 0]));
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144
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145 %!function [r, cmap, a] = write_and_read (w, varargin)
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146 %! filename = [tempname() ".tif"];
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147 %! unwind_protect
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148 %! imwrite (w, filename);
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parents: 18298
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149 %! [r, cmap, a] = imread (filename, varargin{:});
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parents: 18298
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150 %! unwind_protect_cleanup
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parents: 18298
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151 %! unlink (filename);
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parents: 18298
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152 %! end_unwind_protect
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153 %!endfunction
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154
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parents: 18298
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155 ## test PixelRegion option
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parents: 18298
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156 %!testif HAVE_MAGICK
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parents: 18298
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157 %! w = randi (255, 100, 100, "uint8");
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Carnë Draug <carandraug@octave.org>
parents: 18298
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158 %! [r, cmap, a] = write_and_read (w, "PixelRegion", {[50 70] [20 40]});
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Carnë Draug <carandraug@octave.org>
parents: 18298
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159 %! assert (r, w(50:70, 20:40))
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Carnë Draug <carandraug@octave.org>
parents: 18298
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160 %! [r, cmap, a] = write_and_read (w, "PixelRegion", {[50 2 70] [20 3 40]});
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Carnë Draug <carandraug@octave.org>
parents: 18298
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161 %! assert (r, w(50:2:70, 20:3:40))
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Carnë Draug <carandraug@octave.org>
parents: 18298
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162
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Carnë Draug <carandraug@octave.org>
parents: 17744
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163 ## If a file does not exist, it's the job of imread to check the file
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parents: 17744
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164 ## exists before sending it over to __imread__ or whatever function
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parents: 17744
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165 ## is defined in imformats to handle that specific format. This is the
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166 ## same in imfinfo. So in this test we replace one format in imformats
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parents: 17744
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167 ## with something that will not give an error if the file is missing
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168 ## and make sure we do get an error.
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169 %!testif HAVE_MAGICK
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170 %! fmt = fmt_ori = imformats ("jpg");
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parents: 17744
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171 %! fmt.read = @true;
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parents: 17744
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172 %! error_thrown = false;
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173 %! imformats ("update", "jpg", fmt);
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174 %! unwind_protect
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175 %! try
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parents: 17744
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176 %! imread ("I sure hope this file does not exist.jpg");
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177 %! catch
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178 %! error_thrown = true;
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parents: 17744
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179 %! end_try_catch
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Carnë Draug <carandraug@octave.org>
parents: 17744
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180 %! unwind_protect_cleanup
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Carnë Draug <carandraug@octave.org>
parents: 17744
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181 %! imformats ("update", "jpg", fmt_ori);
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parents: 17744
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182 %! end_unwind_protect
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Carnë Draug <carandraug@octave.org>
parents: 17744
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183 %! assert (error_thrown, true);
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184
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185 ## make one of the formats read, return what it received as input to
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186 ## confirm that the input parsing is working correcly
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187 %!testif HAVE_MAGICK
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188 %! fname = [tempname() ".jpg"];
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189 %! def_fmt = imformats ();
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190 %! fid = fopen (fname, "w");
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191 %! unwind_protect
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parents: 17744
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192 %! fmt = imformats ("jpg");
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193 %! fmt.read = @(varargin) varargin;
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parents: 17744
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194 %! imformats ("update", "jpg", fmt);
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Carnë Draug <carandraug@octave.org>
parents: 17744
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195 %! assert (imread (fname), {fname});
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Carnë Draug <carandraug@octave.org>
parents: 17744
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196 %! assert (imread (fname, "jpg"), {fname});
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parents: 17744
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197 %! assert (imread (fname(1:end-4), "jpg"), {fname});
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Carnë Draug <carandraug@octave.org>
parents: 17744
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198 %! extra_inputs = {"some", 89, i, {6 7 8}};
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parents: 17744
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199 %! assert (imread (fname, extra_inputs{:}), {fname, extra_inputs{:}});
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parents: 17744
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200 %! assert (imread (fname, "jpg", extra_inputs{:}), {fname, extra_inputs{:}});
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Carnë Draug <carandraug@octave.org>
parents: 17744
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201 %! assert (imread (fname(1:end-4), "jpg", extra_inputs{:}), {fname, extra_inputs{:}});
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Carnë Draug <carandraug@octave.org>
parents: 17744
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202 %! unwind_protect_cleanup
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Carnë Draug <carandraug@octave.org>
parents: 17744
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203 %! fclose (fid);
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Carnë Draug <carandraug@octave.org>
parents: 17744
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204 %! unlink (fname);
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Carnë Draug <carandraug@octave.org>
parents: 17744
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205 %! imformats (def_fmt);
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Carnë Draug <carandraug@octave.org>
parents: 17744
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206 %! end_unwind_protect
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parents: 17744
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207