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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkNeighborhoodOperator.txx,v $
Language: C++
Date: $Date: 2007-02-01 14:39:33 $
Version: $Revision: 1.20 $
Copyright (c) Insight Software Consortium. All rights reserved.
See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notices for more information.
=========================================================================*/
#ifndef _itkNeighborhoodOperator_txx
#define _itkNeighborhoodOperator_txx
#include "itkNeighborhoodOperator.h"
namespace itk
{
template <class TPixel, unsigned int VDimension, class TAllocator>
void
NeighborhoodOperator<TPixel, VDimension, TAllocator>
::ScaleCoefficients( PixelRealType s )
{
for (unsigned i = 0; i < this->Size(); i++)
{
this->operator[](i) = static_cast< TPixel >( this->operator[](i) * s );
}
}
template <class TPixel, unsigned int VDimension, class TAllocator>
void
NeighborhoodOperator<TPixel, VDimension, TAllocator>
::FlipAxes()
{
// To flip the operator across all of its axes, all we have to do is reverse
// the order of all coefficients.
const unsigned size = this->Size();
unsigned i, swap_with;
PixelType temp;
for (i = 0; i < size/2; ++i)
{
swap_with = size - 1 - i;
temp = this->operator[](i);
this->operator[](i) = this->operator[](swap_with);
this->operator[](swap_with) = temp;
}
}
template <class TPixel, unsigned int VDimension, class TAllocator>
void
NeighborhoodOperator<TPixel, VDimension, TAllocator>
::CreateDirectional()
{
unsigned long k[VDimension];
CoefficientVector coefficients;
coefficients = this->GenerateCoefficients();
for (unsigned int i = 0; i<VDimension; ++i)
{
if (i == this->GetDirection())
{
k[i] = static_cast<unsigned long>( coefficients.size() ) >> 1;
}
else
{
k[i] = 0;
}
}
this->SetRadius(k);
this->Fill(coefficients);
}
template <class TPixel, unsigned int VDimension, class TAllocator>
void
NeighborhoodOperator<TPixel, VDimension, TAllocator>
::CreateToRadius(const SizeType &sz)
{
CoefficientVector coefficients;
coefficients = this->GenerateCoefficients();
this->SetRadius(sz);
this->Fill(coefficients);
}
template <class TPixel, unsigned int VDimension, class TAllocator>
void
NeighborhoodOperator<TPixel, VDimension, TAllocator>
::CreateToRadius(const unsigned long sz)
{
SizeType k;
for (unsigned int i = 0; i< VDimension; i++)
{
k[i] = sz;
}
this->CreateToRadius(k);
}
template <class TPixel, unsigned int VDimension, class TAllocator>
void
NeighborhoodOperator<TPixel, VDimension, TAllocator>
::FillCenteredDirectional(const CoefficientVector &coeff)
{
unsigned int i;
unsigned long start;
std::slice* temp_slice;
CoefficientVector::const_iterator it;
// Initialize all coefficients to zero
this->InitializeToZero();
// Collect slice information
const unsigned long stride = this->GetStride(m_Direction);
const unsigned long size = this->GetSize(m_Direction);
for (i = 0, start = 0; i <VDimension; ++i)
{
if (i != m_Direction)
{
start += this->GetStride(i) * (this->GetSize(i) >> 1);
}
}
// Compare the neighborhood size with the coefficient array size..
const int sizediff = ( (int)size - (int)coeff.size() ) >>1;
// Create a slice iterator centered in the neighborhood.
if (sizediff >= 0)
{
temp_slice = new std::slice(start + sizediff * stride, coeff.size(),
stride);
it = coeff.begin();
}
else
{
temp_slice = new std::slice(start, size, stride);
it = coeff.begin() - sizediff;
}
SliceIteratorType data(this, *temp_slice);
delete temp_slice;
// Copy the coefficients into the neighborhood, truncating them if there
// are too many.
for (data = data.Begin(); data < data.End(); ++data, ++it)
{
*data = static_cast<TPixel>(*it);
}
}
}// namespace itk
#endif
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