wpjoin
Purpose
Recompose wavelet packet
Syntax
T = wpjoin(T,N)
[T,X] = wpjoin(T,N)
T = wpjoin(T)
[T,X] = wpjoin(T)
Description
wpjoin is a one- or two-dimensional wavelet packet analysis function.
wpjoin updates the wavelet packet tree 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 = wpjoin(T,N) returns the modified wavelet packet tree T corresponding to a recomposition of the node N.
[T,X] = wpjoin(T,N) also returns the coefficients of the node.
T = wpjoin(T) is equivalent to T = wpjoin(T,0).
[T,X] = wpjoin(T) is equivalent to [T,X] = wpjoin(T,0).
Examples
% The current extension mode is zero-padding (see dwtmode).
% Load signal.
load noisdopp; x = noisdopp;
% Decompose x at depth 3 with db1 wavelet packets.
wpt = wpdec(x,3,'db1');
% Plot wavelet packet tree wpt.
plot(wpt)
% Recompose packet (1,1) or 2
wpt = wpjoin(wpt,[1 1]);
% Plot wavelet packet tree wpt.
plot(wpt)
See Also
wpdec,
wpdec2,
wpsplt
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