/usr/share/octave/packages/image-2.2.2/private/pad_for_sliding_filter.m is in octave-image 2.2.2-1.
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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 | ## Copyright (C) 2008 Søren Hauberg <soren@hauberg.org>
## Copyright (C) 2012 Carnë Draug <carandraug+dev@gmail.com>
##
## 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/>.
## This private function is to be common to all functions that call
## __spatial_filtering__. It may be better to have __spatial_filtering__ do this
## part as well then
function im = pad_for_sliding_filter (im, window_size, padval)
if (ndims (im) != numel (window_size))
error ("image and domain must have the same number of dimensions")
endif
pad = floor (window_size / 2);
im = padarray (im, pad, padval);
even = ! mod (window_size, 2);
## if one of the domain dimensions is even, its origin is must be
## floor ([size(domain)/2] + 1)
## so after padarray, we need to remove the 1st element (1st row or column for
## dimension 1 and 2) from the dimensions where the domain is even
if (any (even))
idx = cell (1, ndims (im));
for k = 1:ndims(im)
idx{k} = (even(k)+1):size(im, k);
endfor
im = im(idx{:});
endif
endfunction
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