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//
// Copyright (C) : Please refer to the COPYRIGHT file distributed
// with this source distribution.
//
// 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.
//
///////////////////////////////////////////////////////////////////////////////
#include "GaussianFilter.h"
#include <stdlib.h>
GaussianFilter::GaussianFilter(float iSigma )
{
_sigma = iSigma;
_mask = 0;
computeMask();
}
GaussianFilter::GaussianFilter(const GaussianFilter& iBrother)
{
_sigma = iBrother._sigma;
_maskSize = iBrother._maskSize;
_bound = iBrother._bound;
_storedMaskSize = iBrother._storedMaskSize;
_mask = new float[_maskSize*_maskSize];
memcpy(_mask, iBrother._mask, _maskSize*_maskSize*sizeof(float));
}
GaussianFilter& GaussianFilter::operator= (const GaussianFilter& iBrother)
{
_sigma = iBrother._sigma;
_maskSize = iBrother._maskSize;
_bound = iBrother._bound;
_storedMaskSize = iBrother._storedMaskSize;
_mask = new float[_storedMaskSize*_storedMaskSize];
memcpy(_mask, iBrother._mask, _storedMaskSize*_storedMaskSize*sizeof(float));
return *this;
}
GaussianFilter::~GaussianFilter()
{
if(0!=_mask)
{
delete [] _mask;
}
}
int GaussianFilter::computeMaskSize(float sigma)
{
int maskSize = (int)floor(4*sigma)+1;
if(0 == maskSize%2)
++maskSize;
return maskSize;
}
void GaussianFilter::setSigma(float sigma)
{
_sigma = sigma;
computeMask();
}
void GaussianFilter::computeMask()
{
if(0 != _mask){
delete [] _mask;
}
_maskSize = computeMaskSize(_sigma);
_storedMaskSize = (_maskSize+1)>>1;
_bound = _storedMaskSize-1;
float norm = _sigma*_sigma*2.f*M_PI;
float invNorm = 1.0/norm;
_mask = new float[_storedMaskSize*_storedMaskSize*sizeof(float)];
for(int i=0; i<_storedMaskSize; ++i)
for(int j=0; j<_storedMaskSize; ++j)
_mask[i*_storedMaskSize+j] = invNorm*exp(-(i*i + j*j)/(2.0*_sigma*_sigma));
//_mask[i*_storedMaskSize+j] = exp(-(i*i + j*j)/(2.0*_sigma*_sigma));
}
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