pidwt

Performs inverse Direct Wavelet Transform.

Synopsis

pidwt scale [im_in|-] [col_in|-] [im_out|-]

Description

pidwt performs inverse wavelet transform on the input image im_in from the quadratic mirror filter stored in the input collection col_in.

The wavelet transform can be built from operator pdwt. And the filter can be generated from the operator pqmf.

Parameters

scale specifies the number of levels used for the decomposition of the input image.

Inputs

im_in: a 2D float image.
col_in: a collection that contains the filter coefficients.

Outputs

im_out: a 2D float image.

Result

Returns SUCCESS or FAILURE.

Examples

Builds a synthetic image (a square) to illustrate the Gibbs phenomenon in wavelets analysis.

   pshapedesign 256 256 0 2 150 150 a.pan
   pqmf daubechies 4 b.pan
   pdwt 1 a.pan b.pan c.pan
   psplitimage c.pan d1.pan d2.pan d3.pan d4.pan
   pthresholding 20 400 d2.pan e2.pan
   pthresholding 20 400 d3.pan e3.pan
   pthresholding 20 400 d4.pan e4.pan
   pmergeimages d1.pan e2.pan e3.pan e4.pan f.pan
   pidwt 1 f.pan b.pan out.pan

C++ prototype

Errc PIdwt( const Img2dsf &ims, const Collection &c, Img2dsf &imd, int scale=1 );

Version française

Reconstruction d'une image décomposée en ondelettes dyadiques biorthogonales.

Author: Ludovic Soltys