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wpjoin

Recompose wavelet packet

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    Syntax

    T = wpjoin(T,n)
    [T,C] = wpjoin(T,n)

    Description

    wpjoin is a one- and two-dimensional wavelet packet analysis function.

    T = wpjoin(T,n) returns the modified wavelet packet tree T corresponding to a recomposition of the node n. The function updates the wavelet packet tree after the recomposition of the node.

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

    wpjoin(T,0) is equivalent to wpjoin(T).

    example

    [T,C] = wpjoin(T,n) also returns the coefficients of the node.

    Examples

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    Open Live Script

    Load a 1-D signal.

    load noisdopp

    Obtain the wavelet packet tree that corresponds to the wavelet packet decomposition of the signal at level 3 using the db1 wavelet. Plot the tree.

    wpt = wpdec(noisdopp,3,"db1");
plot(wpt)

    Figure contains 2 axes objects and other objects of type uimenu. Axes object 1 with title Tree Decomposition contains 29 objects of type line, text. Axes object 2 with title data for node: 0 or (0,0). contains an object of type line.

    Recompose the tree node at depth-position (1,1). Plot the modified tree.

    wpt = wpjoin(wpt,[1 1]);
plot(wpt)

    Figure contains 2 axes objects and other objects of type uimenu. Axes object 1 with title Tree Decomposition contains 17 objects of type line, text. Axes object 2 with title data for node: 0 or (0,0). contains an object of type line.

    Input Arguments

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    Wavelet packet tree, specified as a wptree object.

    Example: T = wpdec(randn(1,1000),3,"db1")

    Tree node, specified as a nonnegative integer or a 1-by-2 vector. You can specify the node by either its index or depth and position.

    Data Types: double

    Output Arguments

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    Wavelet packet tree coefficients at a node, returned as a vector, matrix, or 3-D array.

    Version History

    Introduced before R2006a

    See Also

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