quadraticresampler_d.h

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#ifndef AIMS_RESAMPLING_QUADRATICRESAMPLER_D_H
#define AIMS_RESAMPLING_QUADRATICRESAMPLER_D_H
 
#include <aims/resampling/quadraticresampler.h>
 
#include <cmath>
 
namespace aims
{
 
template < class T >
QuadraticResampler< T >::QuadraticResampler()
  : SplineResampler< T >()
{
 
  this->_poles.push_back( std::sqrt( 8.0 ) - 3.0 );
  this->_gain = 24.0 - std::sqrt( 512.0 );
 
}
 
 
template < class T >
QuadraticResampler< T >::~QuadraticResampler()
{
}
 
 
template < class T >
int QuadraticResampler< T >::getOrder() const
{
 
  return 2;
 
}
 
template < class T >
double QuadraticResampler< T >::getBSplineWeight( int i, double x ) const
{
 
  x = std::fabs( x - ( double )i );
  if ( x < 0.5 )
  {
 
    return 0.75 - x * x;
 
  }
  if ( x < 1.5 )
  {
 
    x = 1.5 - x;
    return 0.5 * x * x;
 
  }
  return 0.0;
 
}
 
} // namespace aims
 
#endif