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
69
70
71
72
73
74
75
76
77
78
79
80
|
function f=comp_iwpfbt(c,wtNodes,pOutIdxs,chOutIdxs,Ls,ext,interscaling)
%-*- texinfo -*-
%@deftypefn {Function} comp_iwpfbt
%@verbatim
%COMP_IWFBT Compute Inverse Wavelet Packet Filter-Bank Tree
% Usage: f=comp_iwpfbt(c,wtNodes,pOutIdxs,chOutIdxs,Ls,ext)
%
% Input parameters:
% c : Coefficients stored in cell array.
% wtNodes : Filterbank tree nodes (elementary filterbans) in
% reverse BF order. Cell array of structures of length nodeNo.
% pOutIdxs : Idx of each node's parent. Array of length nodeNo.
% chOutIdxs : Idxs of each node children. Cell array of vectors of
% length nodeNo.
% ext : Type of the forward transform boundary handling.
%
% Output parameters:
% f : Reconstructed data in L*W array.
%
%@end verbatim
%@strong{Url}: @url{http://ltfat.github.io/doc/comp/comp_iwpfbt.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/>.
% Do non-expansve transform if ext=='per'
doPer = strcmp(ext,'per');
interscalingfac = 1;
if strcmp('intscale',interscaling)
interscalingfac = 1/2;
elseif strcmp('intsqrt',interscaling)
interscalingfac = 1/sqrt(2);
end
% For each node in tree in the BF order...
for jj=1:length(wtNodes)
% Node filters to a cell array
%gCell = cellfun(@(gEl)conj(flipud(gEl.h(:))),wtNodes{jj}.g(:),'UniformOutput',0);
gCell = cellfun(@(gEl)gEl.h(:),wtNodes{jj}.g(:),'UniformOutput',0);
% Node filters subs. factors
a = wtNodes{jj}.a;
% Node filters initial skips
if(doPer)
%offset = cellfun(@(gEl) 1-numel(gEl.h)-gEl.offset,wtNodes{jj}.g);
offset = cellfun(@(gEl) gEl.offset,wtNodes{jj}.g);
else
offset = -(a-1);
end
if(pOutIdxs(jj))
% Run filterbank and add to the existing subband.
ctmp = comp_ifilterbank_td(c(chOutIdxs{jj}),gCell,a,size(c{pOutIdxs(jj)},1),offset,ext);
c{pOutIdxs(jj)} = c{pOutIdxs(jj)}+ctmp;
c{pOutIdxs(jj)} = interscalingfac*c{pOutIdxs(jj)};
else
% We are at the root.
f = comp_ifilterbank_td(c(chOutIdxs{jj}),gCell,a,Ls,offset,ext);
end
end
|
