Lifting schemes
LS = liftwave(WNAME)
LS = liftwave(WNAME,'Int2Int')
LS = liftwave(WNAME) returns the lifting
scheme associated with the wavelet specified by WNAME. LS is
a structure, not an integer, and used by lwt, ilwt, lwt2,
etc.
LS = liftwave(WNAME,'Int2Int') performs
an integer to integer wavelet transform. Using 'Int2Int' produces
an LS such that when you use [CA,CD] =
lwt(X,LS) or Y = lwt(X,LS) and X is
a vector of integers, the resulting CA, CD,
and Y are vectors of integers. If you omit 'Int2Int' then lwt produces vectors of real numbers.
The valid values for WNAME are
WNAME Values | ||||||
|---|---|---|---|---|---|---|
'lazy' | ||||||
'haar' | ||||||
'db1', 'db2', 'db3', 'db4', 'db5', 'db6', 'db7', 'db8' | ||||||
'sym2', 'sym3', 'sym4', 'sym5', 'sym6', 'sym7', 'sym8' | ||||||
Cohen-Daubechies-Feauveau wavelets
| ||||||
'biorX.Y' | ||||||
'rbioX.Y' | ||||||
'bs3' | ||||||
'rbs3' | ||||||
'9.7' | ||||||
'r9.7' |
For more information about lifting schemes, see lsinfo.
% Start from the db2 wavelet and get the
% corresponding lifting scheme.
lsdb2 = liftwave('db2');
% Visualize the obtained lifting scheme.
displs(lsdb2);
lsdb2 = {...
'd' [ -1.73205081] [0]
'p' [ -0.06698730 0.43301270] [1]
'd' [ 1.00000000] [-1]
[ 1.93185165] [ 0.51763809] []
};