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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 itkFFTShiftImageFilter_h
#define itkFFTShiftImageFilter_h
#include "itkCyclicShiftImageFilter.h"
namespace itk
{
/** \class FFTShiftImageFilter
* \brief Shift the zero-frequency components of a Fourier transform
* to the center of the image.
*
* The Fourier transform produces an image where the zero frequency
* components are in the corner of the image, making it difficult to
* understand. This filter shifts the component to the center of the
* image.
*
* \note For images with an odd-sized dimension, applying this filter
* twice will not produce the same image as the original one without
* using SetInverse(true) on one (and only one) of the two filters.
*
* https://hdl.handle.net/1926/321
*
* \author Gaetan Lehmann. Biologie du Developpement et de la Reproduction, INRA de Jouy-en-Josas, France.
*
* \sa ForwardFFTImageFilter, InverseFFTImageFilter
*
* \ingroup FourierTransform
* \ingroup ITKFFT
*/
template< typename TInputImage, typename TOutputImage >
class ITK_TEMPLATE_EXPORT FFTShiftImageFilter :
public CyclicShiftImageFilter< TInputImage, TOutputImage >
{
public:
/** Standard class typedefs. */
typedef FFTShiftImageFilter Self;
typedef CyclicShiftImageFilter< TInputImage, TOutputImage > Superclass;
typedef SmartPointer< Self > Pointer;
typedef SmartPointer< const Self > ConstPointer;
/** Some convenient typedefs. */
typedef TInputImage InputImageType;
typedef TOutputImage OutputImageType;
typedef typename InputImageType::Pointer InputImagePointer;
typedef typename InputImageType::ConstPointer InputImageConstPointer;
typedef typename InputImageType::RegionType InputImageRegionType;
typedef typename InputImageType::PixelType InputImagePixelType;
typedef typename OutputImageType::Pointer OutputImagePointer;
typedef typename OutputImageType::ConstPointer OutputImageConstPointer;
typedef typename OutputImageType::RegionType OutputImageRegionType;
typedef typename OutputImageType::PixelType OutputImagePixelType;
typedef typename OutputImageType::IndexType IndexType;
typedef typename OutputImageType::SizeType SizeType;
/** ImageDimension constants */
itkStaticConstMacro(ImageDimension, unsigned int, TInputImage::ImageDimension);
/** Standard New method. */
itkNewMacro(Self);
/** Runtime information support. */
itkTypeMacro(FFTShiftImageFilter, CyclicShiftImageFilter);
/** Set/Get whether the filter must invert the transform or not.
* This option has no effect if none of the size of the input image is even,
* but is required to restore the original image if at least one
* of the dimensions has an odd size. */
itkSetMacro(Inverse, bool);
itkGetConstReferenceMacro(Inverse, bool);
itkBooleanMacro(Inverse);
protected:
FFTShiftImageFilter();
~FFTShiftImageFilter() ITK_OVERRIDE {}
void PrintSelf(std::ostream & os, Indent indent) const ITK_OVERRIDE;
/** Override GenerateData method to set some parameters in the
* superclass. */
void GenerateData() ITK_OVERRIDE;
private:
ITK_DISALLOW_COPY_AND_ASSIGN(FFTShiftImageFilter);
bool m_Inverse;
}; // end of class
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkFFTShiftImageFilter.hxx"
#endif
#endif
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