/usr/share/octave/packages/image-2.2.2/imopen.m is in octave-image 2.2.2-1.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 | ## Copyright (C) 2008 Søren Hauberg <soren@hauberg.org>
##
## This program is free software; you can redistribute it and/or modify it under
## the terms of the GNU General Public License as published by the Free Software
## Foundation; either version 3 of the License, or (at your option) any later
## version.
##
## This program is distributed in the hope that it will be useful, but WITHOUT
## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
## FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
## details.
##
## You should have received a copy of the GNU General Public License along with
## this program; if not, see <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {Function File} {} imopen (@var{img}, @var{SE})
## Perform morphological opening.
##
## The matrix @var{img} must be numeric while @var{SE} can be a:
## @itemize @bullet
## @item
## strel object;
## @item
## array of strel objects as returned by `@@strel/getsequence';
## @item
## matrix of 0's and 1's.
## @end itemize
##
## The opening corresponds to an erosion followed by a dilation of @var{img},
## using the same @var{SE}, i.e., it is equivalent to:
## @example
## imdilate (imerode (img, se), se);
## @end example
##
## @seealso{imdilate, imerode, imclose}
## @end deftypefn
function opened = imopen (img, se)
if (nargin != 2)
print_usage ();
elseif (! isimage (img))
error("imopen: IMG must be a numeric matrix");
endif
se = prepare_strel ("imopen", se);
## Perform filtering
opened = imdilate (imerode (img, se), se);
endfunction
%!shared in, out
%! in = [ 0 0 0 1 1 1 0 0 1 1
%! 0 1 0 1 1 1 0 0 0 1
%! 1 1 1 1 1 0 0 0 0 0
%! 0 1 1 1 1 0 0 0 0 0
%! 0 0 0 1 0 0 0 0 1 0
%! 0 0 0 0 0 0 0 1 1 1
%! 0 0 0 0 1 0 1 0 1 0
%! 0 0 0 1 1 1 1 1 0 0
%! 0 0 0 0 1 1 1 0 0 0
%! 0 0 0 1 1 1 0 0 0 0];
%!
%! out = [ 0 0 0 1 1 1 0 0 0 0
%! 0 0 0 1 1 1 0 0 0 0
%! 0 0 0 0 0 0 0 0 0 0
%! 0 0 0 0 0 0 0 0 0 0
%! 0 0 0 0 0 0 0 0 0 0
%! 0 0 0 0 0 0 0 0 0 0
%! 0 0 0 0 0 0 0 0 0 0
%! 0 0 0 0 0 0 0 0 0 0
%! 0 0 0 0 0 0 0 0 0 0
%! 0 0 0 0 0 0 0 0 0 0];
%!assert (imopen (logical (in), ones (3)), logical (out));
%!
%! out = [80 80 1 8 15 51 51 51 51 40
%! 80 80 7 8 15 54 55 55 55 40
%! 4 7 7 8 15 54 55 55 55 40
%! 17 17 17 7 3 54 55 55 55 28
%! 17 17 17 2 9 54 54 54 52 33
%! 17 17 17 29 29 29 29 26 33 33
%! 5 5 13 29 29 29 30 32 39 39
%! 6 6 13 29 29 29 30 32 39 39
%! 10 12 77 77 77 35 35 35 39 39
%! 10 12 77 77 77 35 35 35 27 27];
%!assert (imopen (magic (10), ones (3)), out);
%!assert (imopen (uint8 (magic (10)), strel ("square", 3)), uint8 (out));
%!
%! ## using a se that will be decomposed in 2 pieces
%! out =[ 1 1 1 8 15 40 40 40 40 40
%! 4 4 4 8 15 40 40 40 40 40
%! 4 4 4 8 15 40 40 40 40 40
%! 5 5 5 3 3 28 28 28 28 28
%! 5 5 5 2 9 28 28 28 28 28
%! 5 5 13 26 26 26 26 26 26 26
%! 5 5 13 29 29 29 29 29 27 27
%! 6 6 13 29 29 29 29 29 27 27
%! 6 6 13 29 29 29 29 29 27 27
%! 6 6 13 29 29 29 29 29 27 27];
%!assert (imopen (magic (10), ones(5)), out);
%!
%! ## using a weird non-symmetric and even-size se
%! out =[ 7 7 1 8 15 55 51 51 41 40
%! 7 7 7 8 16 55 55 55 51 41
%! 4 9 7 7 16 54 55 54 55 47
%! 25 25 9 9 3 52 54 52 54 28
%! 25 24 25 2 9 33 52 34 52 34
%! 17 24 29 31 29 30 33 26 33 34
%! 17 5 29 31 31 31 30 32 39 33
%! 10 6 13 35 35 29 31 32 45 39
%! 10 12 77 36 36 35 35 31 45 45
%! 11 12 77 77 77 36 36 35 27 45];
%!assert (imopen (magic (10), [1 0 0 0; 1 1 1 0; 0 1 0 1]), out);
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