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Wavelet packet reconstruction 2-D
X = wprec2(wpt)
X = wprec2(wpt) returns the reconstructed matrix X corresponding to the wavelet packet tree wpt.
X
wpt
example
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Load and display a grayscale image.
load tartan imagesc(X) colormap gray
Use wpdec2 to obtain the 2-level wavelet packet decomposition of the image. Use the Haar wavelet.
wpdec2
wpt = wpdec2(X,2,"haar");
Apply a hard threshold of 75 to the wavelet coefficients. Keep the approximation coefficients.
75
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.
wprec2
xrec = wprec2(wptNew); imagesc(xrec) colormap gray title("Reconstruction of Thresholded Tree")
wptree
Wavelet packet tree, specified as a wptree object. The wprec2 function assumes that you obtained wpt using wpdec2.
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.
image
imfinfo
Introduced before R2006a
wpdec | wpdec2 | wpjoin | wprec | wpsplt | dwpt | idwpt
wpdec
wpjoin
wprec
wpsplt
dwpt
idwpt
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