1## Copyright (C) 2000 Teemu Ikonen <tpikonen@pcu.helsinki.fi> 2## 3## This program is free software; you can redistribute it and/or modify it under 4## the terms of the GNU General Public License as published by the Free Software 5## Foundation; either version 3 of the License, or (at your option) any later 6## version. 7## 8## This program is distributed in the hope that it will be useful, but WITHOUT 9## ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10## FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more 11## details. 12## 13## You should have received a copy of the GNU General Public License along with 14## this program; if not, see <http://www.gnu.org/licenses/>. 15 16## -*- texinfo -*- 17## @deftypefn {Function File} {} ordfilt2 (@var{A}, @var{nth}, @var{domain}) 18## @deftypefnx {Function File} {} ordfilt2 (@var{A}, @var{nth}, @var{domain}, @var{S}) 19## @deftypefnx {Function File} {} ordfilt2 (@dots{}, @var{padding}) 20## Two dimensional ordered filtering. 21## 22## This function exists only for @sc{matlab} compatibility as is just a wrapper 23## to the @code{ordfiltn} which performs the same function on N dimensions. See 24## @code{ordfiltn} help text for usage explanation. 25## 26## @seealso{medfilt2, padarray, ordfiltn} 27## @end deftypefn 28 29function A = ordfilt2 (A, nth, domain, varargin) 30 31 if (nargin < 3) 32 print_usage (); 33 elseif (ndims (A) > 2 || ndims (domain) > 2 ) 34 error ("ordfilt2: A and DOMAIN are limited to 2 dimensinos. Use `ordfiltn' for more") 35 endif 36 A = ordfiltn (A, nth, domain, varargin{:}); 37 38endfunction 39 40%!test 41%! order = 3; 42%! domain = ones (3); 43%! A = zeros (3,3); 44%! B = ones (3,3); 45%! C = [1 1 1; 2 2 2; 3 3 3]; 46%! D = C'; 47%! E = ones (3,3); 48%! E(2,2) = 2; 49%! F = 3 .* ones (3,3); 50%! F(2,2) = 1; 51%! G = [-1 2 7; -5 2 8; -7 pi 9]; 52%! H = [5 2 8; 1 -3 1; 5 1 0]; 53%! A_out = [0 0 0; 0 0 0; 0 0 0]; 54%! B_out = [0 0 0; 0 1 0; 0 0 0]; 55%! C_out = [0 0 0; 0 1 0; 0 0 0]; 56%! D_out = [0 0 0; 0 1 0; 0 0 0]; 57%! E_out = [0 0 0; 0 1 0; 0 0 0]; 58%! F_out = [0 0 0; 0 3 0; 0 0 0]; 59%! G_out = [0 0 0; -1 -1 0; 0 0 0]; 60%! H_out = [0 0 0; 0 1 0; 0 0 0]; 61%! assert (ordfilt2 (A, order, domain), A_out); 62%! assert (ordfilt2 (B, order, domain), B_out); 63%! assert (ordfilt2 (C, order, domain), C_out); 64%! assert (ordfilt2 (D, order, domain), D_out); 65%! assert (ordfilt2 (E, order, domain), E_out); 66%! assert (ordfilt2 (F, order, domain), F_out); 67%! assert (ordfilt2 (G, order, domain), G_out); 68%! assert (ordfilt2 (H, order, domain), H_out); 69