precond1d Preconditionning of an image
precond1d [-i] Signal PrecSignal FicEdgeRi
-i : Inverse preconditionning
Signal : Input signal
PrecSignal : Preconditionned signal
FicEdgeRi : Preconditionning matrices
void precond1d (Inverse , Signal , Output , Edge_Ri )
int *Inverse ;
Fsignal Signal ;
Fsignal Output ;
Fimage Edge_Ri ;
precond1d performs the preconditionning (resp. unpreconditionning) of the first and last coefficients of a univariate digitized signal, before (resp. after) an orthogonal wavelet decomposition or reconstruction with adapted filters for edge coefficients. If the Daubechies wavelet used for the wavelet transform has cancellation degree N, then the (un)preconditionning consists in applying an invertible linear transformation to the first N and last N coefficients of the signal.
The sample values of the input signal are read in the file Signal.
The sample values of the output (un)preconditionned signal are stored in the file PrecSignal.
The coefficients of the preconditionning matrices or filters are read in the file FicEdgeRi. This file contains also the coefficients of the edge adapted filters for the wavelet decomposition.
The -i option specifies the inverse transformation.
Last Modification date : Thu Nov 29 20:23:57 2001