IDTWFBREAL Inverse Dual-tree Filterbank for real-valued signals
Usage: f=idtwfbreal(c,info);
f=idtwfbreal(c,dualwt,Ls);
Input parameters:
c : Input coefficients.
info : Transform params. struct
dualwt : Dual-tree Wavelet Filterbank definition
Ls : Length of the reconstructed signal.
Output parameters:
f : Reconstructed data.
f = IDTWFBREAL(c,info) reconstructs real-valued signal f from the
coefficients c using parameters from info struct. both returned by
DTWFBREAL function.
f = IDTWFBREAL(c,dualwt,Ls) reconstructs real-valued signal f from the
coefficients c using dual-tree filterbank defined by dualwt. Plese
see DTWFBREAL for supported formats. The Ls parameter is mandatory
due to the ambiguity of reconstruction lengths introduced by the
subsampling operation.
Note that the same flag as in the DTWFBREAL function have to be used,
otherwise perfect reconstruction cannot be obtained. Please see help
for DTWFBREAL for description of the flags.
Examples:
---------
A simple example showing perfect reconstruction using IDTWFBREAL:
f = gspi;
J = 7;
wtdef = {'qshift3',J};
c = dtwfbreal(f,wtdef);
fhat = idtwfbreal(c,wtdef,length(f));
% The following should give (almost) zero
norm(f-fhat)
Url: http://ltfat.github.io/doc/wavelets/idtwfbreal.html
See also: dtwfbreal, dtwfbinit.
Package: ltfat