/usr/share/octave/packages/image-2.2.2/imclose.m is in octave-image 2.2.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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} {} imclose (@var{img}, @var{SE})
## Perform morphological closing.
##
## 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 closing corresponds to a dilation followed by an erosion of @var{img},
## using the same @var{SE}, i.e., it is equivalent to:
## @example
## imerode (imdilate (img, se), se);
## @end example
##
## @seealso{imdilate, imerode, imopen}
## @end deftypefn
function closed = imclose (img, se)
if (nargin != 2)
print_usage ();
elseif (! isimage (img))
error("imclose: IMG must be a numeric matrix");
endif
se = prepare_strel ("imclose", se);
## Perform filtering
closed = imerode (imdilate (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 = [ 1 1 1 1 1 1 1 1 1 1
%! 1 1 1 1 1 1 0 0 0 1
%! 1 1 1 1 1 0 0 0 0 1
%! 1 1 1 1 1 0 0 0 0 1
%! 0 0 0 1 1 0 0 0 1 1
%! 0 0 0 1 1 1 1 1 1 1
%! 0 0 0 1 1 1 1 1 1 1
%! 0 0 0 1 1 1 1 1 0 0
%! 0 0 0 1 1 1 1 0 0 0
%! 0 0 0 1 1 1 1 0 0 0];
%!assert (imclose (logical (in), ones (3)), logical (out));
%!
%! out = [99 99 16 16 16 73 74 64 64 64
%! 98 88 16 16 16 73 71 64 64 64
%! 93 88 88 61 61 61 68 70 70 70
%! 93 88 88 61 61 61 68 71 71 71
%! 93 93 88 61 61 61 68 75 66 66
%! 79 79 82 90 90 49 49 49 49 66
%! 79 79 82 91 91 48 46 46 46 66
%! 79 79 82 95 97 48 46 46 46 72
%! 18 18 94 96 84 48 46 46 46 59
%! 18 18 100 96 84 50 50 50 50 59];
%!assert (imclose (magic (10), ones (3)), out);
%!assert (imclose (uint8 (magic (10)), strel ("square", 3)), uint8 (out));
%!
%! ## using a se that will be decomposed in 2 pieces
%! out =[ 99 99 88 74 74 74 74 70 70 70
%! 98 93 88 74 74 74 74 70 70 70
%! 93 93 88 74 74 74 74 70 70 70
%! 93 93 88 74 74 74 74 71 71 71
%! 93 93 88 75 75 75 75 75 75 75
%! 93 93 90 90 90 72 72 72 72 72
%! 93 93 91 91 91 72 72 72 72 72
%! 93 93 93 95 97 72 72 72 72 72
%! 94 94 94 96 97 72 72 72 72 72
%! 100 100 100 97 97 72 72 72 72 72];
%!assert (imclose (magic (10), ones(5)), out);
%!
%! ## using a weird non-symmetric and even-size se
%! out =[ 92 99 16 16 16 70 74 58 58 58
%! 98 88 60 73 16 73 69 70 64 58
%! 88 81 88 60 60 60 69 69 70 70
%! 87 87 61 68 61 60 68 69 71 69
%! 86 93 87 61 61 61 68 75 68 69
%! 23 82 89 89 90 45 68 45 68 66
%! 23 23 82 89 91 48 45 45 45 66
%! 79 23 82 95 97 46 48 46 45 72
%! 18 79 94 96 78 50 46 46 46 59
%! 18 18 100 94 94 78 50 50 46 59];
%!assert (imclose (magic (10), [1 0 0 0; 1 1 1 0; 0 1 0 1]), out);
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