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annotate scripts/image/imread.m @ 16913:d0558ee259ad

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Connect imread with imformats. * private/core_imread.m: new function. Old code from imread() moved here just like what happened to imfinfo(). See message on cset bfad37d33435 * imfinfo.m: reduced to minimum input check, until finding filename. Passes all arguments to imageIO(). * imformats.m: change calls to imread() to the new core_imread().
author Carnë Draug <carandraug@octave.org>
date Sun, 07 Jul 2013 18:26:25 +0100
parents e2de3c8882be
children 1b3b3ee88284
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 ## Copyright (C) 2008-2012 Thomas L. Scofield
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2 ## Copyright (C) 2008 Kristian Rumberg
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3 ## Copyright (C) 2006 Thomas Weber
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4 ## Copyright (C) 2005 Stefan van der Walt
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5 ## Copyright (C) 2002 Andy Adler
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6 ##
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7 ## This file is part of Octave.
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8 ##
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9 ## Octave is free software; you can redistribute it and/or modify it
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10 ## under the terms of the GNU General Public License as published by
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11 ## the Free Software Foundation; either version 3 of the License, or (at
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12 ## your option) any later version.
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13 ##
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14 ## Octave is distributed in the hope that it will be useful, but
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15 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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16 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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17 ## General Public License for more details.
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18 ##
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19 ## You should have received a copy of the GNU General Public License
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20 ## along with Octave; see the file COPYING. If not, see
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21 ## <http://www.gnu.org/licenses/>.
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22
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23 ## Author: Thomas L. Scofield <scofield@calvin.edu>
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24 ## Author: Kristian Rumberg <kristianrumberg@gmail.com>
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25 ## Author: Thomas Weber <thomas.weber.mail@gmail.com>
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26 ## Author: Stefan van der Walt <stefan@sun.ac.za>
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27 ## Author: Andy Adler
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28
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29 ## -*- texinfo -*-
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30 ## @deftypefn {Function File} {[@var{img}, @var{map}, @var{alpha}] =} imread (@var{filename})
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31 ## Read images from various file formats.
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32 ##
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33 ## The size and numeric class of the output depends on the
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34 ## format of the image. A color image is returned as an
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35 ## @nospell{MxNx3} matrix. Gray-level and black-and-white images are
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36 ## of size @nospell{MxN}.
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37 ## The color depth of the image determines the numeric
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38 ## class of the output: "uint8" or "uint16" for gray
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39 ## and color, and "logical" for black and white.
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40 ##
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41 ## @seealso{imwrite, imfinfo}
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42 ## @end deftypefn
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43
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44 function varargout = imread (filename, varargin)
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45 if (nargin < 1)
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46 print_usage ();
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47 elseif (! ischar (filename))
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48 error ("imread: FILENAME must be a string");
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49 endif
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50 varargout{1:nargout} = imageIO (@core_imread, "read", filename,
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51 filename, varargin{:});
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52 endfunction
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53
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54 %!testif HAVE_MAGICK
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55 %! vpng = [ ...
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56 %! 137, 80, 78, 71, 13, 10, 26, 10, 0, 0, ...
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57 %! 0, 13, 73, 72, 68, 82, 0, 0, 0, 3, ...
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58 %! 0, 0, 0, 3, 8, 2, 0, 0, 0, 217, ...
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59 %! 74, 34, 232, 0, 0, 0, 1, 115, 82, 71, ...
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60 %! 66, 0, 174, 206, 28, 233, 0, 0, 0, 4, ...
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61 %! 103, 65, 77, 65, 0, 0, 177, 143, 11, 252, ...
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62 %! 97, 5, 0, 0, 0, 32, 99, 72, 82, 77, ...
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63 %! 0, 0, 122, 38, 0, 0, 128, 132, 0, 0, ...
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64 %! 250, 0, 0, 0, 128, 232, 0, 0, 117, 48, ...
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65 %! 0, 0, 234, 96, 0, 0, 58, 152, 0, 0, ...
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66 %! 23, 112, 156, 186, 81, 60, 0, 0, 0, 25, ...
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67 %! 73, 68, 65, 84, 24, 87, 99, 96, 96, 96, ...
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68 %! 248, 255, 255, 63, 144, 4, 81, 111, 101, 84, ...
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69 %! 16, 28, 160, 16, 0, 197, 214, 13, 34, 74, ...
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70 %! 117, 213, 17, 0, 0, 0, 0, 73, 69, 78, ...
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71 %! 68, 174, 66, 96, 130];
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72 %! fid = fopen ("test.png", "wb");
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73 %! fwrite (fid, vpng);
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74 %! fclose (fid);
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75 %! A = imread ("test.png");
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76 %! delete ("test.png");
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77 %! assert (A(:,:,1), uint8 ([0, 255, 0; 255, 237, 255; 0, 255, 0]));
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78 %! assert (A(:,:,2), uint8 ([0, 255, 0; 255, 28, 255; 0, 255, 0]));
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79 %! assert (A(:,:,3), uint8 ([0, 255, 0; 255, 36, 255; 0, 255, 0]));
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80