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
57
58
59
60
61
62
63
64
65
66
67
68
|
function f = comp_iufwt(c,g,a,J,scaling)
%-*- texinfo -*-
%@deftypefn {Function} comp_iufwt
%@verbatim
%COMP_IUFWT Compute Inverse Undecimated DWT
% Usage: f = comp_iufwt(c,g,J,a);
%
% Input parameters:
% c : L*M*W array of coefficients, M=J*(filtNo-1)+1.
% g : Synthesis wavelet filters-Cell-array of length filtNo.
% J : Number of filterbank iterations.
% a : Upsampling factors - array of length filtNo.
%
% Output parameters:
% f : Reconstructed data - L*W array.
%
%
%@end verbatim
%@strong{Url}: @url{http://ltfat.github.io/doc/comp/comp_iufwt.html}
%@end deftypefn
% Copyright (C) 2005-2016 Peter L. Soendergaard <peter@sonderport.dk>.
% This file is part of LTFAT version 2.3.1
%
% 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/>.
% see comp_fwt for explanantion
assert(a(1)==a(2),'First two elements of a are not equal. Such wavelet filterbank is not suported.');
% For holding the impulse responses.
filtNo = length(g);
gOffset = cellfun(@(gEl) gEl.offset,g(:));
% Optionally scale the filters
g = comp_filterbankscale(g(:),a(:),scaling);
%Change format to a matrix
gMat = cell2mat(cellfun(@(gEl) gEl.h(:),g(:)','UniformOutput',0));
% Read top-level appr. coefficients.
ca = squeeze(c(:,1,:));
cRunPtr = 2;
for jj=1:J
% Current iteration filter upsampling factor.
filtUps = a(1)^(J-jj);
% Zero index position of the upsampled filetrs.
offset = filtUps.*gOffset ;%+ filtUps;
% Run the filterbank
ca=comp_iatrousfilterbank_td([reshape(ca,size(ca,1),1,size(ca,2)),...
c(:,cRunPtr:cRunPtr+filtNo-2,:)],gMat,filtUps,offset);
% Bookkeeping
cRunPtr = cRunPtr + filtNo -1;
end
% Copy to the output.
f = ca;
|
