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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 itkHalfToFullHermitianImageFilter_h
#define itkHalfToFullHermitianImageFilter_h
#include "itkImageToImageFilter.h"
#include "itkSimpleDataObjectDecorator.h"
namespace itk
{
/**
* \class HalfToFullHermitianImageFilter
*
* \brief Expands a half image produced from a real-to-complex
* discrete Fourier transform (DFT) to the full complex image.
*
* The subclasses of RealToHalfHermitianForwardFFTImageFilter produce only
* the non-redundant half of the image resulting from a
* real-to-complex DFT. This filter takes the non-redundant half image
* and generates the full complex image that includes the redundant
* half. It requires additional information about the output image
* size, namely, whether the size in the first dimension of the output
* image is odd.
*
* \ingroup FourierTransform
*
* \sa RealToHalfHermitianForwardFFTImageFilter
* \ingroup ITKFFT
*/
template <typename TInputImage>
class ITK_TEMPLATE_EXPORT HalfToFullHermitianImageFilter : public ImageToImageFilter<TInputImage, TInputImage>
{
public:
ITK_DISALLOW_COPY_AND_MOVE(HalfToFullHermitianImageFilter);
/** Standard class type aliases. */
using InputImageType = TInputImage;
using InputImagePixelType = typename InputImageType::PixelType;
using InputImageIndexType = typename InputImageType::IndexType;
using InputImageIndexValueType = typename InputImageType::IndexValueType;
using InputImageSizeType = typename InputImageType::SizeType;
using InputImageSizeValueType = typename InputImageType::SizeValueType;
using InputImageRegionType = typename InputImageType::RegionType;
using OutputImageType = TInputImage;
using OutputImagePixelType = typename OutputImageType::PixelType;
using OutputImageIndexType = typename OutputImageType::IndexType;
using OutputImageIndexValueType = typename OutputImageType::IndexValueType;
using OutputImageSizeType = typename OutputImageType::SizeType;
using OutputImageSizeValueType = typename OutputImageType::SizeValueType;
using OutputImageRegionType = typename OutputImageType::RegionType;
using Self = HalfToFullHermitianImageFilter;
using Superclass = ImageToImageFilter<TInputImage, TInputImage>;
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** \see LightObject::GetNameOfClass() */
itkOverrideGetNameOfClassMacro(HalfToFullHermitianImageFilter);
/** Extract the dimensionality of the input and output images. */
static constexpr unsigned int ImageDimension = TInputImage::ImageDimension;
/** Was the original truncated dimension size in the x-dimension odd? */
itkSetGetDecoratedInputMacro(ActualXDimensionIsOdd, bool);
itkBooleanMacro(ActualXDimensionIsOdd);
protected:
HalfToFullHermitianImageFilter();
~HalfToFullHermitianImageFilter() override = default;
void
DynamicThreadedGenerateData(const OutputImageRegionType & outputRegionForThread) override;
/** The output is a different size from the input. */
void
GenerateOutputInformation() override;
/** This class requires the entire input. */
void
GenerateInputRequestedRegion() override;
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
# include "itkHalfToFullHermitianImageFilter.hxx"
#endif
#endif // itkHalfToFullHermitianImageFilter_h
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