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wprec2

Wavelet packet reconstruction 2-D

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    Syntax

    X = wprec2(wpt)

    Description

    X = wprec2(wpt) returns the reconstructed matrix X corresponding to the wavelet packet tree wpt.

    example

    Examples

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    Open Live Script

    Load and display a grayscale image.

    load tartan
imagesc(X)
colormap gray

    Figure contains an axes object. The axes object contains an object of type image.

    Use wpdec2 to obtain the 2-level wavelet packet decomposition of the image. Use the Haar wavelet.

    wpt = wpdec2(X,2,"haar");

    Apply a hard threshold of 75 to the wavelet coefficients. Keep the approximation coefficients.

    keepapp = 1;
sorh = "h";
thr = 75;
wptNew = wpthcoef(wpt,keepapp,sorh,thr);

    Use wprec2 to reconstruct the image associated with the new wavelet packet tree. Display the results.

    xrec = wprec2(wptNew);
imagesc(xrec)
colormap gray
title("Reconstruction of Thresholded Tree")

    Figure contains an axes object. The axes object with title Reconstruction of Thresholded Tree contains an object of type image.

    Input Arguments

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    Wavelet packet tree, specified as a wptree object. The wprec2 function assumes that you obtained wpt using wpdec2.

    Output Arguments

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    Reconstruction, returned as a matrix or 3-D array.

    If wpt is obtained from an indexed image analysis or a truecolor image analysis, X is an M-by-N matrix or an M-by-N-by-3 array, respectively.

    For more information on image formats, see image and imfinfo.

    Version History

    Introduced before R2006a

    See Also

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