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view main/signal/idct2.m @ 0:6b33357c7561 octave-forge
Initial revision
author | pkienzle |
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date | Wed, 10 Oct 2001 19:54:49 +0000 |
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## Copyright (C) 2001 Paul Kienzle ## ## 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 2 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, write to the Free Software ## Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA ## y = idct2 (x) ## Computes the inverse 2-D discrete cosine transform of matrix x ## ## y = idct2 (x, m, n) or y = idct2 (x, [m n]) ## Computes the 2-D inverse DCT of x after padding or trimming rows to m and ## columns to n. ## Author: Paul Kienzle ## 2001-02-08 ## * initial revision function y = idct2 (x, m, n) if (nargin < 1 || nargin > 3) usage("idct (x) or idct (x, m, n) or idct (x, [m n])"); endif if nargin == 1 [m, n] = size (x); elseif (nargin == 2) n = m (2); m = m (1); endif if m == 1 y = idct (x.', n).'; elseif n == 1 y = idct (x, m); else y = idct (idct (x, m).', n).'; endif endfunction