/usr/share/octave/packages/image-2.6.1/bwpropfilt.m is in octave-image 2.6.1-1.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 | ## Copyright (C) 2014 Carnë Draug <carandraug@octave.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} {} bwpropfilt (@var{bw}, @var{attrib})
## @deftypefnx {Function File} {} bwpropfilt (@var{bw}, @var{I}, @var{attrib})
## @deftypefnx {Function File} {} bwpropfilt (@dots{}, @var{range})
## @deftypefnx {Function File} {} bwpropfilt (@dots{}, @var{n})
## @deftypefnx {Function File} {} bwpropfilt (@dots{}, @var{n}, @var{keep})
## @deftypefnx {Function File} {} bwpropfilt (@dots{}, @dots{}, @var{conn})
## Filter objects from image based on their properties.
##
## Returns a logical matrix with the objects of @var{bw} filtered based
## on the specific property @var{attrib}. The possible values for @var{attrib}
## are all the properties from @command{regionprops} that return a scalar
## value, e.g., Area, Extent, and MaxIntensity, but not PixelValues, basic, and
## BoundingBox. For certain attributes, such as MaxIntensity and
## WeightedCentroid, the grayscale image @var{I} must also be specified.
##
## To filter objects with a value on a specific interval, @var{range} must be
## a two-element vector with the interval @code{[@var{low} @var{high}]}
## (values are inclusive).
##
## Alternatively, a scalar @var{n} will select the objects with the N highest
## values. The @var{keep} option defaults to @qcode{"largest"} but can also
## be set to @qcode{"smallest"} to select the N objects with lower values.
##
## The last optional argument, @var{conn}, can be a connectivity matrix, or
## the number of elements connected to the center (see @command{conndef}).
##
## @seealso{bwareaopen, bwareafilt, bwlabel, bwlabeln, bwconncomp, regionprops}
## @end deftypefn
function bwfiltered = bwpropfilt (bw, varargin)
if (nargin < 3 || nargin > 6)
print_usage ();
endif
if (ischar (varargin{1}))
no_gray = true;
attrib = varargin{1};
next_idx = 2;
else
no_gray = false;
img = varargin{1};
attrib = varargin{2};
next_idx = 3;
endif
valid_nargin = @(x) numel (varargin) >= x;
if (isscalar (varargin{next_idx}))
## Get the N largest or smallest
in_range = false;
n_keep = varargin{next_idx};
next_idx++;
if (valid_nargin (next_idx) && ischar (varargin{next_idx}))
keep = tolower (varargin{next_idx});
if (! any (strcmpi (keep, {"largest", "smallest"})))
error ("bwpropfilt: KEEP must be `largest' or `smallest'");
endif
next_idx++;
else
keep = "largest";
endif
elseif (numel (varargin{next_idx}) == 2)
in_range = true;
range = varargin{next_idx};
next_idx++;
else
error ("bwpropfilt: N and RANGE must have 1 or 2 elements respectively");
endif
if (valid_nargin (next_idx))
conn = conndef (varargin{next_idx++});
if (valid_nargin (next_idx))
print_usage ();
endif
else
## Non-documented default
conn = conndef (ndims (bw), "maximal");
endif
cc = bwconncomp (bw, conn);
if (no_gray)
stats = regionprops (cc, {"PixelIdxList", attrib});
else
stats = regionprops (cc, img, {"PixelIdxList", attrib});
endif
n_objs = numel (stats);
idxs = {stats.PixelIdxList};
attribs = [stats.(attrib)];
if (in_range)
filtered_idxs = idxs(attribs >= range(1) & attribs <= range(2));
else
[~, sorted_idxs] = sort (attribs, "descend");
switch (keep)
case "largest",
filtered_idxs = idxs(sorted_idxs(1:min (n_keep, n_objs)));
case "smallest",
filtered_idxs = idxs(sorted_idxs(max (1, n_objs - n_keep +1):end));
endswitch
endif
bwfiltered = false (size (bw));
bwfiltered(cat (1, filtered_idxs{:})(:)) = true;
endfunction
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