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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: itkGrayscaleFunctionErodeImageFilter.txx
Language: C++
Date: $Date$
Version: $Revision$
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 __itkGrayscaleFunctionErodeImageFilter_txx
#define __itkGrayscaleFunctionErodeImageFilter_txx
#include "itkGrayscaleFunctionErodeImageFilter.h"
namespace itk {
template<class TInputImage, class TOutputImage, class TKernel>
GrayscaleFunctionErodeImageFilter<TInputImage, TOutputImage, TKernel>
::GrayscaleFunctionErodeImageFilter()
{
m_ErodeBoundaryCondition.SetConstant( NumericTraits<PixelType>::max() );
this->OverrideBoundaryCondition( &m_ErodeBoundaryCondition );
}
template<class TInputImage, class TOutputImage, class TKernel>
typename GrayscaleFunctionErodeImageFilter<TInputImage, TOutputImage, TKernel>::PixelType
GrayscaleFunctionErodeImageFilter<TInputImage, TOutputImage, TKernel>
::Evaluate(const NeighborhoodIteratorType &nit,
const KernelIteratorType kernelBegin,
const KernelIteratorType kernelEnd)
{
unsigned int i;
PixelType min = NumericTraits<PixelType>::max();
PixelType temp;
KernelIteratorType kernel_it;
for( i=0, kernel_it=kernelBegin; kernel_it<kernelEnd; ++kernel_it, ++i )
{
// if structuring element is positive, use the pixel under that element
// in the image minus the structuring element value
if( *kernel_it > NumericTraits< KernelPixelType >::Zero )
{
// subtract the structuring element value to the pixel value,
// note we use GetPixel() on SmartNeighborhoodIterator to respect
// boundary condition
temp = nit.GetPixel(i) - (PixelType) *kernel_it;
if( temp < min )
{
min = temp;
}
}
}
return min;
}
}// end namespace itk
#endif
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