wavedec

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Aseel H
Aseel H on 29 Dec 2011
in function [c,s] = wavedec2(x,n.wname); can any one help me about "s" that is bookkeeping matrix? how it calculate? and if i want separate the subbands from "c" by use "s" so become approximation, vertical, diagonal, horizenital separated subbands... ??

Accepted Answer

Wayne King
Wayne King on 29 Dec 2011
Hi Aseel, You can use detcoef2 and appcoef2 along with the inputs C and S to extract the appropriate coefficients.
For example:
load woman;
[C,S] = wavedec2(X,3,'bior3.5');
% get the horizontal, vertical, and diagonal details at level 1
[H,V,D] = detcoef2('all',C,S,1);
% get the approximation coefficients at level 1
A = appcoef2(C,S,'bior3.5',1);
  1 Comment
Aseel H
Aseel H on 30 Dec 2011
Thank you Wayne, but if I use lwt2()for multi level as:
X_InPlace = lwt2(X,W,LEVEL,'typeDEC',typeDEC)
What refers to the 'typeDEC',typeDEC?
and also here how separate the subbands?

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