wpjoin (Wavelet Toolbox)

Recompose wavelet packet.

[T,D] = wpjoin(T,D,N)
[T,D,X] = wpjoin(T,D,N)
[T,D] = wpjoin(T,D)
[T,D,X] = wpjoin(T,D)

Description

wpjoin is a one- or two-dimensional wavelet packet analysis function. wpjoin updates the tree and data structures after the recomposition of a node.

The nodes are numbered from left to right and from top to bottom. The root index is 0.

[T,D] = wpjoin(T,D,N) returns the modified tree structure T and the modified data structure D (see maketree), corresponding to a recomposition of the node N.

[T,D,X] = wpjoin(T,D,N) also returns the coefficients of the node.

[T,D] = wpjoin(T,D) is equivalent to [T,D] = wpjoin(T,D,0).

[T,D,X] = wpjoin(T,D) is equivalent to [T,D,X] = wpjoin(T,D,0).

Examples

% Load signal. 
    load noisdopp; x = noisdopp;

% Decompose x at depth 3 with db1 wavelet packets. 
    [wpt,wpd] = wpdec(x,3,'db1');

% Plot wavelet packet tree structure wpt. 
    plottree(wpt)




% Recompose packet (1,1) or 2 
    [wpt,wpd] = wpjoin(wpt,wpd,[1 1]);

% Plot wavelet packet tree structure wpt. 
    plottree(wpt)