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if I use lwt2()for multi level as:
X_InPlace = lwt2(X,W,LEVEL,'typeDEC',typeDEC)
What refers to the 'typeDEC',typeDEC?
and how separate the subbands as cA,cH,cV,cD for each level?

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Wayne King
Wayne King 2011-12-31

0 个投票

Hi Aseel, Glad to see you are using the lifting utilities in the Wavelet Toolbox, they're definitely powerful.
'typeDEC' takes the value 'w' or 'wp'. 'w' gives you a wavelet subband filtering, while 'wp' gives you a wavelet packet tree.
If you use X_InPlace, you can separate the coefficients as follows.
CA = X_InPlace(1:2:end,1:2:end)
CH = X_InPlace(2:2:end,1:2:end)
CV = X_InPlace(1:2:end,2:2:end)
CD = X_InPlace(2:2:end,2:2:end)
For example:
load woman;
X_InPlace = lwt2(X,'bior3.5',1,'typeDEC','w');
CA = X_InPlace(1:2:end,1:2:end);
CH = X_InPlace(2:2:end,1:2:end);
CV = X_InPlace(1:2:end,2:2:end);
CD = X_InPlace(2:2:end,2:2:end);

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Aseel H
Aseel H 2011-12-31
thank you very much
Aseel H
Aseel H 2011-12-31
but it if I use one level, what about using more one leve?

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