wavedec

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... ??

Answer 1

[Wayne King]

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);

[Aseel H]

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?