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/*=========================================================================
Program: Insight Segmentation & Registration Toolkit
Module: $RCSfile: itkPadImageFilter.txx,v $
Language: C++
Date: $Date: 2003-09-10 14:28:54 $
Version: $Revision: 1.16 $
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 _itkPadImageFilter_txx
#define _itkPadImageFilter_txx
#include "itkPadImageFilter.h"
#include "itkImageRegionIterator.h"
#include "itkObjectFactory.h"
namespace itk
{
/**
*
*/
template <class TInputImage, class TOutputImage>
PadImageFilter<TInputImage,TOutputImage>
::PadImageFilter()
{
for( unsigned int j = 0; j < ImageDimension; j++ )
{
m_PadLowerBound[j] = 0;
m_PadUpperBound[j] = 0;
}
}
/**
*
*/
template <class TInputImage, class TOutputImage>
void
PadImageFilter<TInputImage,TOutputImage>
::PrintSelf(std::ostream& os, Indent indent) const
{
Superclass::PrintSelf(os,indent);
os << indent << "Output Pad Lower Bounds: [";
if (ImageDimension >= 1)
{
os << m_PadLowerBound[0];
}
for( unsigned int j = 1; j < ImageDimension; j++ )
{
os << ", " << m_PadLowerBound[j];
}
os << "]" << std::endl;
os << indent << "Output Pad Upper Bounds: [";
if (ImageDimension >= 1)
{
os << m_PadUpperBound[0];
}
for( unsigned int j = 1; j < ImageDimension; j++ )
{
os << ", " << m_PadUpperBound[j];
}
os << "]" << std::endl;
}
/**
* PadImageFilter needs a smaller input requested region than
* output requested region. As such, PadImageFilter needs to
* provide an implementation for GenerateInputRequestedRegion() in
* order to inform the pipeline execution model.
*
* \sa ProcessObject::GenerateInputRequestedRegion()
*/
template <class TInputImage, class TOutputImage>
void
PadImageFilter<TInputImage,TOutputImage>
::GenerateInputRequestedRegion()
{
long sizeTemp;
// call the superclass' implementation of this method
// Superclass::GenerateInputRequestedRegion();
// get pointers to the input and output
typename Superclass::InputImagePointer inputPtr =
const_cast< TInputImage * >( this->GetInput() );
typename Superclass::OutputImagePointer outputPtr = this->GetOutput();
if ( !inputPtr || !outputPtr )
{
return;
}
// we need to compute the input requested region (size and start index)
unsigned int i;
const typename TOutputImage::SizeType& outputRequestedRegionSize
= outputPtr->GetRequestedRegion().GetSize();
const typename TOutputImage::IndexType& outputRequestedRegionStartIndex
= outputPtr->GetRequestedRegion().GetIndex();
const typename TInputImage::SizeType& inputWholeRegionSize
= inputPtr->GetLargestPossibleRegion().GetSize();
const typename TInputImage::IndexType& inputWholeRegionStartIndex
= inputPtr->GetLargestPossibleRegion().GetIndex();
typename TInputImage::SizeType inputRequestedRegionSize;
typename TInputImage::IndexType inputRequestedRegionStartIndex;
for (i = 0; i < TInputImage::ImageDimension; i++)
{
if (outputRequestedRegionStartIndex[i] <= inputWholeRegionStartIndex[i])
{
inputRequestedRegionStartIndex[i] = inputWholeRegionStartIndex[i];
}
else
{
inputRequestedRegionStartIndex[i] =
outputRequestedRegionStartIndex[i];
}
if ((inputWholeRegionStartIndex[i]+static_cast<long>(inputWholeRegionSize[i])) <=
(outputRequestedRegionStartIndex[i]+static_cast<long>(outputRequestedRegionSize[i])))
{
sizeTemp = static_cast<long>(inputWholeRegionSize[i])
+ inputWholeRegionStartIndex[i] - inputRequestedRegionStartIndex[i];
}
else
{
sizeTemp = static_cast<long>(outputRequestedRegionSize[i])
+ outputRequestedRegionStartIndex[i] - inputRequestedRegionStartIndex[i];
}
//
// The previous statements correctly handle overlapped regions where
// at least some of the pixels from the input image end up reflected
// in the output. When there is no overlap, the size will be negative.
// In that case we arbitrarily pick the start of the input region
// as the start of the output region and zero for the size.
//
if (sizeTemp < 0)
{
inputRequestedRegionSize[i] = 0;
inputRequestedRegionStartIndex[i] = inputWholeRegionStartIndex[i];
} else {
inputRequestedRegionSize[i] = sizeTemp;
}
}
typename TInputImage::RegionType inputRequestedRegion;
inputRequestedRegion.SetSize( inputRequestedRegionSize );
inputRequestedRegion.SetIndex( inputRequestedRegionStartIndex );
inputPtr->SetRequestedRegion( inputRequestedRegion );
}
/**
* PadImageFilter produces an image which is a different resolution
* than its input image. As such, PadImageFilter needs to provide an
* implementation for GenerateOutputInformation() in order to inform
* the pipeline execution model. The original documentation of this
* method is below.
*
* \sa ProcessObject::GenerateOutputInformaton()
*/
template <class TInputImage, class TOutputImage>
void
PadImageFilter<TInputImage,TOutputImage>
::GenerateOutputInformation()
{
// call the superclass' implementation of this method
Superclass::GenerateOutputInformation();
// get pointers to the input and output
typename Superclass::InputImageConstPointer inputPtr = this->GetInput();
typename Superclass::OutputImagePointer outputPtr = this->GetOutput();
if ( !outputPtr || !inputPtr)
{
return;
}
// we need to compute the output image size, and the
// output image start index
unsigned int i;
typename TOutputImage::SizeType outputSize;
typename TOutputImage::IndexType outputStartIndex;
typename TInputImage::SizeType inputSize;
typename TInputImage::IndexType inputStartIndex;
inputSize = inputPtr->GetLargestPossibleRegion().GetSize();
inputStartIndex = inputPtr->GetLargestPossibleRegion().GetIndex();
for (i = 0; i < TOutputImage::ImageDimension; i++)
{
outputSize[i] = static_cast<long>(inputSize[i]) + m_PadLowerBound[i] + m_PadUpperBound [i];
outputStartIndex[i] = inputStartIndex[i] - static_cast<long>(m_PadLowerBound[i]);
}
typename TOutputImage::RegionType outputLargestPossibleRegion;
outputLargestPossibleRegion.SetSize( outputSize );
outputLargestPossibleRegion.SetIndex( outputStartIndex );
outputPtr->SetLargestPossibleRegion( outputLargestPossibleRegion );
}
} // end namespace itk
#endif
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