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
|
function c=comp_uwfbt(f,wtNodes,nodesUps,rangeLoc,rangeOut,scaling)
%-*- texinfo -*-
%@deftypefn {Function} comp_uwfbt
%@verbatim
%COMP_UWFBT Compute Undecimated Wavelet Filterbank Tree
% Usage: c=comp_uwfbt(f,wtNodes,nodesUps,rangeLoc,rangeOut);
%
% Input parameters:
% f : Input L*W array.
% wtNodes : Filterbank tree nodes (elementary filterbanks) in
% BF order. Length nodeNo cell array of structures.
% nodesUps : Filters upsampling factor of each node. Array of
% length nodeNo.
% rangeLoc : Idxs of each node terminal outputs. Length nodeNo
% cell array of vectors.
% rangeOut : Output subband idxs of each node terminal outputs.
%
% Output parameters:
% c : Coefficient array of dim. L*M*W.
%
%@end verbatim
%@strong{Url}: @url{http://ltfat.github.io/doc/comp/comp_uwfbt.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/>.
% Pre-allocated output
[L, W] = size(f);
M = sum(cellfun(@(rEl) numel(rEl),rangeOut));
c = zeros(L,M,W,assert_classname(f,wtNodes{1}.h{1}.h));
% Convenience input reshape
ca = reshape(f,size(f,1),1,size(f,2));
% For each node in tree in the BF order...
for jj=1:numel(wtNodes)
% Node filters subs. factors
a = wtNodes{jj}.a;
% Optionally scale the filters
h = comp_filterbankscale(wtNodes{jj}.h(:),a(:),scaling);
% Node filters to a matrix
% hMat = cell2mat(cellfun(@(hEl) conj(flipud(hEl.h(:))),h','UniformOutput',0));
hMat = cell2mat(cellfun(@(hEl) hEl.h(:),h','UniformOutput',0));
% Node filters initial skips
% hOffset = cellfun(@(hEl) 1-numel(hEl.h)-hEl.offset,wtNodes{jj}.h);
hOffset = cellfun(@(hEl) hEl.offset,wtNodes{jj}.h);
% Zero index position of the upsampled filters.
offset = nodesUps(jj).*(hOffset);
% Run filterbank.
catmp=comp_atrousfilterbank_td(squeeze(ca(:,1,:)),hMat,nodesUps(jj),offset);
% Bookkeeping
% Copy what goes directly to the output...
c(:,rangeOut{jj},:)=catmp(:,rangeLoc{jj},:);
% ...and save the rest.
diffRange = 1:size(hMat,2);
diffRange(rangeLoc{jj}) = [];
ca = [ca(:,2:end,:), catmp(:,diffRange,:)];
end
|
