wavedec

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Aseel H 2011-12-29

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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... ??

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Answer 1

Wayne King 2011-12-29

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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);