/usr/share/octave/packages/image-2.2.2/private/im2col_check.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 | ## 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/>.
## A private function originally written for im2col but that can also
## be used by colfilt and nlfilt, since the syntax is very similar.
function [p, block_size, padval] = im2col_check (func, nargin, A, varargin)
if (nargin < 2)
print_usage (func);
elseif (! ismatrix (A) || ! (isnumeric (A) || islogical (A)))
error ("%s: A must be a numeric of logical matrix", func);
endif
p = 1; # varargin param being processsed
padval = 0;
## Check for 'indexed' presence
if (ischar (varargin{p}) && strcmpi (varargin{p}, "indexed"))
if (nargin < 3)
print_usage (func);
endif
## We pad with value of 0 for indexed images of uint8 or uint16 class.
## Indexed images of signed integer, or above uint16, are treated the
## same as floating point (a value of 1 is index 1 on the colormap)
if (any (isa (A, {"uint8", "uint16"})))
padval = 0;
else
padval = 1;
endif
p++;
endif
## check [m,n]
block_size = varargin{p++};
if (! isnumeric (block_size) || ! isvector (block_size) ||
any (block_size(:) < 1))
error ("%s: BLOCK_SIZE must be a vector of positive elements.", func);
endif
block_size(end+1:ndims(A)) = 1; # expand singleton dimensions if required
block_size = block_size(:).'; # make sure it's a row vector
endfunction
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