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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 itkInverseFFTImageFilter_h
#define itkInverseFFTImageFilter_h
#include "itkImageToImageFilter.h"
namespace itk
{
/** \class InverseFFTImageFilter
*
* \brief Base class for inverse Fast Fourier Transform.
*
* This is a base class for the "inverse" or "reverse" Discrete Fourier
* Transform. This is an abstract base class: the actual implementation is
* provided by the best child available on the system when the object is
* created via the object factory system.
*
* This class transforms a full complex image with Hermitian symmetry into
* its real spatial domain representation. If the input does not have
* Hermitian symmetry, the imaginary component is discarded.
*
* \ingroup FourierTransform
*
* \sa ForwardFFTImageFilter, InverseFFTImageFilter
* \ingroup ITKFFT
*/
template< typename TInputImage, typename TOutputImage=Image< typename TInputImage::PixelType::value_type, TInputImage::ImageDimension> >
class ITK_TEMPLATE_EXPORT InverseFFTImageFilter:
public ImageToImageFilter< TInputImage, TOutputImage >
{
public:
/** Standard class typedefs. */
typedef TInputImage InputImageType;
typedef typename InputImageType::PixelType InputPixelType;
typedef TOutputImage OutputImageType;
typedef typename OutputImageType::PixelType OutputPixelType;
typedef InverseFFTImageFilter Self;
typedef ImageToImageFilter< InputImageType, OutputImageType > Superclass;
typedef SmartPointer< Self > Pointer;
typedef SmartPointer< const Self > ConstPointer;
itkStaticConstMacro(ImageDimension, unsigned int,
InputImageType::ImageDimension);
/** Customized object creation methods that support configuration-based
* selection of FFT implementation.
*
* Default implementation is VnlFFT. */
static Pointer New();
/* Return the prefered greatest prime factor supported for the input image
* size. Defaults to 2 as many implementations work only for sizes that are
* power of 2.
*/
virtual SizeValueType GetSizeGreatestPrimeFactor() const;
protected:
InverseFFTImageFilter() {}
virtual ~InverseFFTImageFilter(){}
/** This class requires the entire input. */
virtual void GenerateInputRequestedRegion();
/** Sets the output requested region to the largest possible output
* region. */
void EnlargeOutputRequestedRegion( DataObject *itkNotUsed(output) );
private:
ITK_DISALLOW_COPY_AND_ASSIGN(InverseFFTImageFilter);
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
#ifndef itkVnlInverseFFTImageFilter_h
#ifndef itkVnlInverseFFTImageFilter_hxx
#ifndef itkFFTWInverseFFTImageFilter_h
#ifndef itkFFTWInverseFFTImageFilter_hxx
#include "itkInverseFFTImageFilter.hxx"
#endif
#endif
#endif
#endif
#endif
#endif
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