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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 itkHalfToFullHermitianImageFilter_hxx
#define itkHalfToFullHermitianImageFilter_hxx
#include "itkHalfToFullHermitianImageFilter.h"
#include "itkImageAlgorithm.h"
#include "itkImageRegionIteratorWithIndex.h"
#include "itkProgressReporter.h"
namespace itk
{
template< typename TInputImage >
HalfToFullHermitianImageFilter< TInputImage >
::HalfToFullHermitianImageFilter()
{
this->ActualXDimensionIsOddOff();
}
template< typename TInputImage >
void
HalfToFullHermitianImageFilter< TInputImage >
::GenerateOutputInformation()
{
// Call the superclass' implementation of this method
Superclass::GenerateOutputInformation();
// Get pointers to the input and output
typename InputImageType::ConstPointer inputPtr = this->GetInput();
typename OutputImageType::Pointer outputPtr = this->GetOutput();
if ( !inputPtr || !outputPtr )
{
return;
}
const typename InputImageType::SizeType & inputSize =
inputPtr->GetLargestPossibleRegion().GetSize();
const typename InputImageType::IndexType & inputStartIndex =
inputPtr->GetLargestPossibleRegion().GetIndex();
typename OutputImageType::SizeType outputSize;
typename OutputImageType::IndexType outputStartIndex;
for ( unsigned int i = 0; i < OutputImageType::ImageDimension; i++ )
{
outputSize[i] = inputSize[i];
outputStartIndex[i] = inputStartIndex[i];
}
outputSize[0] = ( inputSize[0] - 1 ) * 2;
if ( this->GetActualXDimensionIsOdd() )
{
outputSize[0]++;
}
typename OutputImageType::RegionType outputLargestPossibleRegion;
outputLargestPossibleRegion.SetSize( outputSize );
outputLargestPossibleRegion.SetIndex( outputStartIndex );
outputPtr->SetLargestPossibleRegion( outputLargestPossibleRegion );
}
template< typename TInputImage >
void
HalfToFullHermitianImageFilter< TInputImage >
::GenerateInputRequestedRegion()
{
Superclass::GenerateInputRequestedRegion();
// Get pointers to the input and output
typename InputImageType::Pointer inputPtr =
const_cast< InputImageType * >( this->GetInput() );
if ( inputPtr )
{
inputPtr->SetRequestedRegionToLargestPossibleRegion();
}
}
template< typename TInputImage >
void
HalfToFullHermitianImageFilter< TInputImage >
::ThreadedGenerateData(const OutputImageRegionType & outputRegionForThread,
ThreadIdType threadId)
{
// Get pointers to the input and output.
typename InputImageType::ConstPointer inputPtr = this->GetInput();
typename OutputImageType::Pointer outputPtr = this->GetOutput();
if ( !inputPtr || !outputPtr )
{
return;
}
InputImageRegionType inputRegion = inputPtr->GetLargestPossibleRegion();
const InputImageIndexType & inputRegionIndex = inputRegion.GetIndex();
const InputImageSizeType & inputRegionSize = inputRegion.GetSize();
InputImageIndexType inputRegionMaximumIndex = inputRegionIndex + inputRegionSize;
// Copy the non-reflected region.
OutputImageRegionType copyRegion( outputRegionForThread );
bool copy = copyRegion.Crop( inputRegion );
float initialProgress = 0.0f;
if ( copy )
{
initialProgress = static_cast< float >( copyRegion.GetNumberOfPixels() ) /
static_cast< float >( outputRegionForThread.GetNumberOfPixels() );
}
// Set up the ProgressReporter.
ProgressReporter progress( this, threadId, outputRegionForThread.GetNumberOfPixels(),
100, initialProgress );
if ( copy )
{
ImageAlgorithm::Copy( inputPtr.GetPointer(), outputPtr.GetPointer(),
copyRegion, copyRegion );
}
// Now copy the redundant complex conjugate region, if there is one
// in this thread's output region.
OutputImageIndexType outputRegionIndex = outputRegionForThread.GetIndex();
OutputImageSizeType outputRegionSize = outputRegionForThread.GetSize();
OutputImageIndexType outputRegionMaximumIndex = outputRegionIndex + outputRegionSize;
if ( outputRegionMaximumIndex[0] > inputRegionMaximumIndex[0] )
{
OutputImageIndexType conjugateRegionIndex( outputRegionIndex );
conjugateRegionIndex[0] = std::max(outputRegionIndex[0], inputRegionMaximumIndex[0] );
OutputImageSizeType conjugateRegionSize( outputRegionSize );
conjugateRegionSize[0] = outputRegionMaximumIndex[0] - conjugateRegionIndex[0];
OutputImageRegionType conjugateRegion( conjugateRegionIndex, conjugateRegionSize );
ImageRegionIteratorWithIndex< OutputImageType > oIt( outputPtr, conjugateRegion );
for (oIt.GoToBegin(); !oIt.IsAtEnd(); ++oIt)
{
OutputImageIndexType conjugateIndex = oIt.GetIndex();
// Flip the indices in each dimension.
OutputImageIndexType index( conjugateIndex );
for (unsigned int i = 0; i < ImageDimension; ++i)
{
OutputImageRegionType outputLargestPossibleRegion =
outputPtr->GetLargestPossibleRegion();
OutputImageIndexType outputLargestPossibleRegionIndex =
outputLargestPossibleRegion.GetIndex();
OutputImageSizeType outputLargestPossibleRegionSize =
outputLargestPossibleRegion.GetSize();
if ( conjugateIndex[i] != outputLargestPossibleRegionIndex[i] )
{
index[i] = outputLargestPossibleRegionSize[i] - conjugateIndex[i] +
2 * outputLargestPossibleRegionIndex[i];
}
}
oIt.Set( std::conj( inputPtr->GetPixel( index ) ) );
progress.CompletedPixel();
}
}
}
} // end namespace itk
#endif // itkHalfToFullHermitianImageFilter_hxx
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