| Wavelet Toolbox™ | |
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Syntax
Description
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 |
Comments |
'lazy' |
A "lazy" wavelet is a second-generation wavelet and is not a true mathematical wavelet. |
'haar' |
Same as 'db1', 'bior1.1', and 'cdf1.1' |
'db1', 'db2', 'db3', 'db4', 'db5', 'db6', 'db7', 'db8' |
'db2' same as 'sym2', 'db3', and 'sym4' |
'sym2', 'sym3', 'sym4', 'sym5', 'sym6', 'sym7', 'sym8' |
|
Cohen-Daubechies-Feauveau wavelets'cdf1.1','cdf1.3','cdf1.5''cdf3.1','cdf3.3','cdf3.5' 'cdf5.1','cdf5.3','cdf5.5''cdf2.2','cdf2.4','cdf2.6''cdf4.2','cdf4.4','cdf4.6''cdf6.2','cdf6.4','cdf6.6' |
'cdfX.Y' same as 'biorX.Y' except for bior4.4 and bior5.5. |
'biorX.Y' |
See waveinfo |
'rbioX.Y' |
Reverse of 'biorX.Y'.See waveinfo |
'bs3' |
Same as 'cdf4.2' |
'rbs3' |
Reverse of 'bs3' |
'9.7' |
Same as 'bior4.4' |
'r9.7' |
Reverse of '9.7' |
For more information about lifting schemes, see lsinfo.
Examples
% 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] [] };
See Also
laurpoly
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| liftfilt | localmax | |
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