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/*=========================================================================
*
* Copyright Insight Software Consortium
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0.txt
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*=========================================================================*/
#ifndef itkConvolutionImageFilterBase_hxx
#define itkConvolutionImageFilterBase_hxx
#include "itkConvolutionImageFilterBase.h"
namespace itk
{
template< typename TInputImage, typename TKernelImage, typename TOutputImage >
ConvolutionImageFilterBase< TInputImage, TKernelImage, TOutputImage >
::ConvolutionImageFilterBase() :
m_Normalize( false ),
m_OutputRegionMode( Self::SAME )
{
this->AddRequiredInputName("KernelImage");
m_BoundaryCondition = &m_DefaultBoundaryCondition;
}
template< typename TInputImage, typename TKernelImage, typename TOutputImage >
void
ConvolutionImageFilterBase< TInputImage, TKernelImage, TOutputImage >
::GenerateOutputInformation()
{
// Call the superclass' implementation of this method. Default
// behavior corresponds to SAME output region mode.
Superclass::GenerateOutputInformation();
if ( m_OutputRegionMode == Self::VALID )
{
OutputRegionType validRegion = this->GetValidRegion();
typename OutputImageType::Pointer outputPtr = this->GetOutput();
outputPtr->SetLargestPossibleRegion( validRegion );
}
}
template< typename TInputImage, typename TKernelImage, typename TOutputImage >
typename ConvolutionImageFilterBase< TInputImage, TKernelImage, TOutputImage >::OutputRegionType
ConvolutionImageFilterBase< TInputImage, TKernelImage, TOutputImage >
::GetValidRegion() const
{
typename InputImageType::ConstPointer inputPtr = this->GetInput();
InputRegionType inputLargestPossibleRegion = inputPtr->GetLargestPossibleRegion();
OutputIndexType validIndex = inputLargestPossibleRegion.GetIndex();
OutputSizeType validSize = inputLargestPossibleRegion.GetSize();
// Shrink the output largest possible region by the kernel radius.
KernelSizeType kernelSize = this->GetKernelImage()->GetLargestPossibleRegion().GetSize();
KernelSizeType radius;
for ( unsigned int i = 0; i < ImageDimension; ++i )
{
radius[i] = kernelSize[i] / 2;
if ( validSize[i] < 2*radius[i] )
{
validIndex[i] = 0;
validSize[i] = 0;
}
else
{
validIndex[i] = validIndex[i] + static_cast< typename OutputIndexType::IndexValueType >
( radius[i] );
validSize[i] = validSize[i] - 2*radius[i];
// If the kernel is has an even size in one dimension, then we
// need to expand the image size by one and subtract one from
// the index in that dimension to account for the zero-padding
// on the low-index side of the image.
if ( kernelSize[i] % 2 == 0 )
{
validIndex[i] -= 1;
validSize[i] += 1;
}
}
}
OutputRegionType validRegion( validIndex, validSize );
return validRegion;
}
template< typename TInputImage, typename TKernelImage, typename TOutputImage >
void
ConvolutionImageFilterBase< TInputImage, TKernelImage, TOutputImage >
::SetOutputRegionModeToSame()
{
this->SetOutputRegionMode( Self::SAME );
}
template< typename TInputImage, typename TKernelImage, typename TOutputImage >
void
ConvolutionImageFilterBase< TInputImage, TKernelImage, TOutputImage >
::SetOutputRegionModeToValid()
{
this->SetOutputRegionMode( Self::VALID );
}
template< typename TInputImage, typename TKernelImage, typename TOutputImage >
void
ConvolutionImageFilterBase< TInputImage, TKernelImage, TOutputImage >
::PrintSelf(std::ostream & os, Indent indent) const
{
Superclass::PrintSelf( os, indent );
os << indent << "Normalize: " << m_Normalize << std::endl;
os << indent << "BoundaryCondition: "
<< m_BoundaryCondition->GetNameOfClass() << std::endl;
os << indent << "OutputRegionMode: ";
switch ( m_OutputRegionMode )
{
case SAME:
os << "SAME";
break;
case VALID:
os << "VALID";
break;
default:
os << "unknown";
break;
}
os << std::endl;
}
}
#endif
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