.TH WREFINE 3wvlt "1 May 1995"
.SH NAME
wrefine_[fd]a1d \- perform a wavelet refinement
.SH SYNOPSIS
.ft B
.nf
#include <wvlt.h>
.sp .5
void wrefine_da1d(a, nA, nNew, wfltr, aRefined);
\s-1double\s0 *a, *aRefined;
\s-1int\s0 nA, nNew;
\s-1waveletfilter\s0 *wfltr;
.sp .5
void wrefine_fa1d(a, nA, nNew, wfltr, aRefined);
\s-1float\s0 *a, *aRefined;
\s-1int\s0 nA, nNew;
\s-1waveletfilter\s0 *wfltr;
.ft R
.fi
.SH DESCRIPTION
.LP
These functions, which are part of the UBC Imager Wavelet Library,
perform wavelet refinement on data.
Every function uses a particular wavelet filter, specified by the
.I wfltr
pointer.
The possible choices are described on the
.I wfltr(3wvlt)
man page.
.LP
Refinement is a general term which encompasses interpolation.
A wavelet refinement is an interpolation if a refinement from
.I nA
points in
.I a[]
to
.I nNew
points in
.I aRefined[]
leaves the original
.I nA
points intact.
Both
.I nA
and
.I nNew
(>=
.IR nA )
must be powers of two.
.LP
Whether or not it does so depends on the wavelet filter.
Of the filters implemented in this package, these interpolate:
Haar, all Splines, Daubechies 8, all Coiflets, and Pseudocoiflet.
.LP
The individual functions are:
.TP 20
.B wrefine_da1d()
refines double-precision data.
.TP 20
.B wrefine_fa1d()
refines float data.
.SH DIAGNOSTICS
If
.I nA
is less than 2, these functions return quietly.
.SH FILES
.TP 20
.B libwvlt.a