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//
// Simple image compression example
//
// $Id: Example.C,v 4.0.2.1.2.1 1999/07/20 16:16:19 geert Exp $
//
// Copyright (C) 1996-1999 Department of Computer Science, K.U.Leuven, Belgium
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
#ifndef NULL
#define NULL 0
#endif
#include <waili/Image.h>
int main(void)
{
const char infile[] = "image.pgm";
const char outfile[] = "result.pgm";
double threshold = 20.0;
Image image;
// Read the image
image.Import(infile);
// Transform the image using the Cohen-Daubechies-Feauveau
// (2, 2) biorthogonal wavelets
Wavelet *wavelet = Wavelet::CreateCDF(2, 2);
Wavelet_ID id = wavelet->GetID();
delete wavelet;
TransformDescriptor transform[] = {
{ TT_ColsRows, id },
{ TT_ColsRows, id },
{ TT_ColsRows, id },
{ TT_ColsRows, id },
{ TT_ColsRows, id },
{ TT_ColsRows, id },
{ TT_ColsRows, id },
{ TT_ColsRows, id }
};
image.Fwt(transform, sizeof(transform)/sizeof(*transform));
// Zero all entries smaller than the threshold
for (u_int ch = 0; ch < image.GetChannels(); ch++)
image[ch]->Threshold(threshold);
// Inverse wavelet transform
image.IFwt();
// Write the reconstructed image to a file
image.Export(outfile);
return(0);
}
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