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WTStruct(2) Scilab Function WTStruct(2)
NAME
WTStruct - Retrieve a 1D Discrete Wavelet Structure.
Author: Bertrand Guiheneuf
This routine retrieves the structure informations contained in a 1D
Wavelet Transform.
Usage
[ScIndex, ScLength]=WT2DStruct(wt)
Input parameters
o wt : real unidimensional matrix [1,n] Contains the wavelet transform
(obtained with FWT).
Output parameters
o index : real matrix [1,NbIter] Contains the indexes (in wt) of the
projection of the signal on the multiresolution subspaces
o length : real matrix [1,NbIter] Contains the dimensions of each pro-
jection
Description
Introduction
This routine is used to retreive the structure information of a wavelet
transform. It must be used in all routine that might work on a wavelet
transform whose structure is not passed as an imput parameter. (That should
be the case of all routines taking a Wavelet Transform as input parameter
to minimize the input).
Parameters
Input must be a real matrix. It's generally obtained with FWT. It contains
the wavelet transform. index contains the indexes of the first coefficient
of each output. The first "NbIter" indexes are the indexes (in wt) of the
"high-pass" subspaces projections (Wj), the last one is the last "low-pass"
projection (Vj); length contains the dimension of each output.
Example
a=rand(1,256); q=MakeQMF('daubechies',4); wt = FWT2D(a,8,q); wti,
wtl=WTStruct(wt); wtl
See Also
FWT2D, IWT2D, WT2Dext, WT2DVisu
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