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precond2d

$ \bigcirc$Name


precond2d (Un)Preconditionning of an image




$ \bigcirc$Command Synopsis


precond2d [-i] Image PrecImage FicEdgeRi



-i : Inverse preconditionning

Image : Input image

PrecImage : Preconditionned image

FicEdgeRi : Preconditionning matrices




$ \bigcirc$Function Summary


void precond2d (Inverse , Image , Output , Edge_Ri )

int *Inverse ;

Fimage Image ;

Fimage Output ;

Fimage Edge_Ri ;




$ \bigcirc$Description


precond2d performs the preconditionning (resp. unpreconditionning) of the first and last columns and lines of a digitized image, before (resp. after) an orthogonal wavelet decomposition or reconstruction with adapted filters for edge coefficients. This transformation is separable, i.e. the corresponding one-dimensional transform is applied successively to each line and each column of the image. See precond1d module's documentation for a descripton of the one-dimensional algorithm.

The sample values of the input image are read in the file Image.

The sample values of the output (un)preconditionned signal are stored in the file PrecImage.

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.




$ \bigcirc$See Also


iowave2, owave2.


$ \bigcirc$Version 1.01


Last Modification date : Thu Nov 29 20:23:57 2001


$ \bigcirc$Author


Jean-Pierre D'Ales






next up previous contents index
Next: sconvolve Up: Reference Previous: precond1d   Contents   Index
mw 2004-05-05