您正在查看 "Wavelet" 分类下的文章 2009年06月18日 星期四 11:36 >> wavenames()
ans =
'lazy'
'haar'
'db1' 'db2' 'db3' 'db4' 'db5' 'db6' 'db7' 'db8' 'db9' 'db10'
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2009年06月15日 星期一 10:26 WTHCOEF Wavelet coefficient thresholding 1-D.
NC = WTHCOEF('d',C,L,N,P) returns coefficients obtained
from the wavelet decomposition structure [C,L] (see WAVEDEC),
by rate compression defined in vectors N and P.
N contains the detail levels to be compressed and P the
corresponding percentages of lower coefficients
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2009年06月08日 星期一 15:05 lshaar=liftwave('haar');
els={'p',[-0.125,0.125],0};
lsnew=addlift(lshaar,els);
displs(lsnew)
X=1:8
[c,d]=lwt(X,lsnew)
[a,b]=dwt(X,'haar')
X1=idwt(a,b,'haar')
X2=ilwt(c,d,lsnew)
ans =
lsnew = {... |
2009年06月03日 星期三 11:01 >> s=1:8
s =
1 2 3 4 5 6 7 8
>> [a,b]=dwt(s,'haar')
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2009年05月19日 星期二 17:51 SimuWave
A Wavelet Simulink Toolbox
Presentation
Simuwave is a Simulink 2.2 toolbox which implements various wavelet transforms, including wavelet decomposition and reconstruction in a basis and its related discrete dyadic shift invariant wavelet transform.
More information is |
2009年05月14日 星期四 16:43 You can use lifting methods to design new wavelets. The new lifting methods also allow integer-to-integer wavelet transforms and transforms using different length decomposition high-pass and low-pass filters. Five groups of new lifting functions are included in Wavelet Toolbox, Version 3.0:
- Key lifting scheme structures
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2009年05月14日 星期四 16:15 LIFTWAVE Lifting scheme for usual wavelets.
LS = LIFTWAVE(WNAME) returns the lifting scheme
associated to the wavelet specified by WNAME.
LS = LIFTWAVE(WNAME,'Int2Int') allows to perform an
integer to integer wavelet transform.
The valid values for WNAME are:
'lazy'
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2009年05月14日 星期四 16:08 BSWFUN Biorthogonal scaling and wavelet functions.
[PHIS,PSIS,PHIA,PSIA,XVAL] = BSWFUN(LoD,HiD,LoR,HiR)
returns approximations on the grid XVAL of the two
pairs of scaling function and wavelet (PHIA,PSIA),
(PHIS,PSIA) associated with the two pairs of filters
(LoD,HiD), (LoR,HiR).
BSWFUN(...,ITER) co |
2009年05月14日 星期四 15:57 LIFTFILT Apply elementary lifting steps on filters.
[LoDN,HiDN,LoRN,HiRN] = LIFTFILT(LoD,HiD,LoR,HiR,ELS)
returns the four filters LoDN, HiDN, LoRN, HiRN
obtained by an "elementary lifting step" (ELS) starting
from the four filters LoD, HiD, LoR and HiR.
The four input filters are supposed to verify the
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2009年05月14日 星期四 15:39 LSINFO Information about lifting schemes.
A lifting scheme (LS) is a N x 3 cell array. The N-1 first
rows of the array are "elementary lifting steps" (ELS).
The last row gives the normalization of LS.
Each ELS has the following format:
{type , coefficients , max_degree}
wh |
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