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/*=========================================================================
*
* Copyright NumFOCUS
*
* 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
*
* https://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
namespace itk
{
template <typename TInputImage, typename TKernelImage, typename TOutputImage>
ConvolutionImageFilterBase<TInputImage, TKernelImage, TOutputImage>::ConvolutionImageFilterBase()
{
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 == ConvolutionImageFilterBaseEnums::ConvolutionImageFilterOutputRegion::VALID)
{
OutputRegionType validRegion = this->GetValidRegion();
typename OutputImageType::Pointer outputPtr = this->GetOutput();
outputPtr->SetLargestPossibleRegion(validRegion);
}
}
template <typename TInputImage, typename TKernelImage, typename TOutputImage>
auto
ConvolutionImageFilterBase<TInputImage, TKernelImage, TOutputImage>::GetValidRegion() const -> OutputRegionType
{
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(ConvolutionImageFilterBaseEnums::ConvolutionImageFilterOutputRegion::SAME);
}
template <typename TInputImage, typename TKernelImage, typename TOutputImage>
void
ConvolutionImageFilterBase<TInputImage, TKernelImage, TOutputImage>::SetOutputRegionModeToValid()
{
this->SetOutputRegionMode(ConvolutionImageFilterBaseEnums::ConvolutionImageFilterOutputRegion::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 << "DefaultBoundaryCondition: ";
m_DefaultBoundaryCondition.Print(os, indent);
os << indent << "BoundaryCondition: ";
if (m_BoundaryCondition)
{
m_BoundaryCondition->Print(os, indent);
}
else
{
os << indent << "nullptr" << std::endl;
}
os << indent << "OutputRegionMode: " << m_OutputRegionMode << std::endl;
}
} // namespace itk
#endif
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