.TH WFLTR 3wvlt "5 July 1995"
.SH NAME
wfltr \- define and operate on analysis and synthesis components of a wavelet filter
.SH SYNOPSIS
.ft B
.nf
#include <wvlt.h>
.sp .5
void wfltr_exchange(wfltrNorm, wfltrExch);
\s-1waveletfilter\s0 *wfltrNorm, *wfltrExch;
.ft R
.fi
.SH DESCRIPTION
.LP
The UBC Imager Wavelet Library defines several possible wavelet bases
in its header file.  These are:
.TP 20
wfltrBattleLemarie
Battle-Lemarie basis
.TP 20
wfltrBurtAdelson
Burt-Adelson basis
.TP 20
wfltrCoiflet_2, wfltrCoiflet_4, wfltrCoiflet_6
Coiflet bases with 2, 4, or 6 vanishing moments
.TP 20
wfltrDaubechies_4, wfltrDaubechies_6, wfltrDaubechies_8,
.TP 20
wfltrDaubechies_10, wfltrDaubechies_12, wfltrDaubechies_20
Daubechies bases with 2, 3, 4, 5, 6, or 10 vanishing moments, respectively.
.TP 20
wfltrHaar
Haar basis
.TP 20
wfltrPseudocoiflet_4_4
Pseudocoiflet basis with 4 vanishing moments for both analysis
and synthesis wavelets.
.TP 20
wfltrSpline_2_2, wfltrSpline_2_4, wfltrSpline_3_3, wfltrSpline_3_7
Spline bases with linear (wfltrSpline_2x) or quadratic (wfltrSpline_3x)
bases for the dominant wavelet.
.LP
The function
.IR wfltr_exchange() ,
converts the filter specified in
.I wfltrNorm
to another filter
.I wfltrExch
which has the analysis and synthesis components swapped.
For speed (and to prove a point) this is done by a simple set of swaps
within the waveletfilter structure.  While it's okay for wfltrNorm and
wfltrExch to point at the same structure, to avoid confusion they should be
distinct.
.SH DIAGNOSTICS
None.
.SH FILES
.TP 20
.B libwvlt.a