/usr/share/octave/packages/image-2.4.1/labelmatrix.m is in octave-image 2.4.1-1.
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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 | ## Copyright (C) 2013 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} {} labelmatrix (@var{cc})
## Create labelled matrix from bwconncomp structure.
##
## Uses the structure as returned by the @code{bwconncomp} function to create
## a label matrix, where each individual object is assigned a positive number.
## A value of zero corresponds to the background.
##
## The class of the output matrix is dependent on the number of objects, being
## uint, uint16, uint32, or double, whichever is enough.
##
## @seealso{bwconncomp, bwlabel, bwlabeln, label2rgb, rgb2label}
## @end deftypefn
function labelled = labelmatrix (cc)
if (nargin != 1)
print_usage ();
elseif (! isstruct (cc) && ! all (isfield (cc, {"Connectivity", "ImageSize",
"NumObjects", "PixelIdxList"})))
error ("labelmatrix: CC must be a struct as returned by bwconncomp");
endif
n_obj = cc.NumObjects;
if (n_obj < 256), cl = "uint8";
elseif (n_obj < 65536), cl = "uint16";
elseif (n_obj < 4294967296), cl = "uint32";
else, cl = "double";
endif
## There's certainly a more efficient way to do this...
n = 1;
labels = cell2mat (cellfun (@(ind) repmat (n++, 1, numel(ind)),
cc.PixelIdxList, "UniformOutput", false));
ind = cell2mat (cc.PixelIdxList');
labelled = zeros (cc.ImageSize, cl);
labelled(ind) = labels;
endfunction
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