cubicresampler_d.h

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#ifndef AIMS_RESAMPLING_CUBICRESAMPLER_D_H
#define AIMS_RESAMPLING_CUBICRESAMPLER_D_H
 
#include <aims/resampling/cubicresampler.h>
 
#include <cmath>
 
namespace aims
{
 
template < class T >
CubicResampler< T >::CubicResampler()
  : SplineResampler< T >()
{
 
  this->_poles.push_back( std::sqrt( 3.0 ) - 2.0 );
  this->_gain = 12.0 - std::sqrt( 108.0 );
 
}
 
 
template < class T >
CubicResampler< T >::~CubicResampler()
{
}
 
 
template < class T >
int CubicResampler< T >::getOrder() const
{
 
  return 3;
 
}
 
 
template < class T >
double CubicResampler< T >::getBSplineWeight( int i, double x ) const
{
 
  x = std::fabs( x - ( double )i );
  if ( x < 1.0 )
  {
 
    return ( x * x * ( x - 2.0 ) * 3.0 + 4.0 ) * ( 1.0 / 6.0 );
 
  }
  if ( x < 2.0 )
  {
 
    x = 2.0 - x;
    return x * x * x * ( 1.0 / 6.0 );
 
  }
  return 0.0;
 
}
 
} // namespace aims
 
#endif