Wavelet packet coefficients thresholding
NT = wpthcoef(T,KEEPAPP,SORH,THR)
wpthcoef is a one- or two-dimensional de-noising and compression utility.
NT = wpthcoef(T,KEEPAPP,SORH,THR) returns a new wavelet packet tree NT obtained from the wavelet packet tree T by coefficients thresholding.
If KEEPAPP = 1, approximation coefficients are not thresholded; otherwise, they can be thresholded.
If SORH = 's', soft thresholding is applied; if SORH = 'h', hard thresholding is applied (see wthresh for more information).
THR is the threshold value.