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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 itkInverseDeconvolutionImageFilter_h
#define itkInverseDeconvolutionImageFilter_h
#include "itkFFTConvolutionImageFilter.h"
namespace itk
{
/** \class InverseDeconvolutionImageFilter
* \brief The direct linear inverse deconvolution filter.
*
* The inverse filter is the most straightforward deconvolution
* method. Considering that convolution of two images in the spatial domain is
* equivalent to multiplying the Fourier transform of the two images,
* the inverse filter consists of inverting the multiplication. In
* other words, this filter computes the following:
* \f[ hat{F}(\omega) =
* \begin{cases}
* G(\omega) / H(\omega) & \text{if $|H(\omega)| \geq \epsilon$} \\
* 0 & \text{otherwise}
* \end{cases}
* \f]
* where \f$\hat{F}(\omega)\f$ is the Fourier transform of the
* estimate produced by this filter, \f$G(\omega)\f$ is the Fourier
* transform of the input blurred image, \f$H(\omega)\f$ is the
* Fourier transform of the blurring kernel, and \f$\epsilon\f$ is a
* constant real non-negative threshold (called
* KernelZeroMagnitudeThreshold in this filter) that determines when
* the magnitude of a complex number is considered zero.
*
* \author Gaetan Lehmann, Biologie du Developpement et de la Reproduction, INRA de Jouy-en-Josas, France
* \author Cory Quammen, The University of North Carolina at Chapel Hill
*
* \ingroup ITKDeconvolution
*
*/
template< typename TInputImage, typename TKernelImage = TInputImage, typename TOutputImage = TInputImage, typename TInternalPrecision=double >
class ITK_TEMPLATE_EXPORT InverseDeconvolutionImageFilter :
public FFTConvolutionImageFilter< TInputImage, TKernelImage, TOutputImage, TInternalPrecision >
{
public:
typedef InverseDeconvolutionImageFilter Self;
typedef FFTConvolutionImageFilter< TInputImage,
TKernelImage,
TOutputImage,
TInternalPrecision > Superclass;
typedef SmartPointer< Self > Pointer;
typedef SmartPointer< const Self > ConstPointer;
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** Run-time type information ( and related methods ) */
itkTypeMacro(InverseDeconvolutionImageFilter, FFTConvolutionImageFilter);
/** Dimensionality of input and output data is assumed to be the same. */
itkStaticConstMacro(ImageDimension, unsigned int,
TInputImage::ImageDimension);
typedef TInputImage InputImageType;
typedef TOutputImage OutputImageType;
typedef TKernelImage KernelImageType;
typedef typename Superclass::InputPixelType InputPixelType;
typedef typename Superclass::OutputPixelType OutputPixelType;
typedef typename Superclass::KernelPixelType KernelPixelType;
typedef typename Superclass::InputIndexType InputIndexType;
typedef typename Superclass::OutputIndexType OutputIndexType;
typedef typename Superclass::KernelIndexType KernelIndexType;
typedef typename Superclass::InputSizeType InputSizeType;
typedef typename Superclass::OutputSizeType OutputSizeType;
typedef typename Superclass::KernelSizeType KernelSizeType;
typedef typename Superclass::SizeValueType SizeValueType;
typedef typename Superclass::InputRegionType InputRegionType;
typedef typename Superclass::OutputRegionType OutputRegionType;
typedef typename Superclass::KernelRegionType KernelRegionType;
/** Internal image types. */
typedef typename Superclass::InternalImageType InternalImageType;
typedef typename Superclass::InternalImagePointerType InternalImagePointerType;
typedef typename Superclass::InternalComplexType InternalComplexType;
typedef typename Superclass::InternalComplexImageType InternalComplexImageType;
typedef typename Superclass::InternalComplexImagePointerType InternalComplexImagePointerType;
/** Set/get the threshold value uused to determine whether a
* frequency of the Fourier transform of the blurring kernel is
* considered to be zero. Default value is 1.0e-4. */
itkSetMacro(KernelZeroMagnitudeThreshold, double);
itkGetConstMacro(KernelZeroMagnitudeThreshold, double);
protected:
InverseDeconvolutionImageFilter();
~InverseDeconvolutionImageFilter() ITK_OVERRIDE {}
/** This filter uses a minipipeline to compute the output. */
virtual void GenerateData() ITK_OVERRIDE;
virtual void PrintSelf(std::ostream & os, Indent indent) const ITK_OVERRIDE;
private:
ITK_DISALLOW_COPY_AND_ASSIGN(InverseDeconvolutionImageFilter);
double m_KernelZeroMagnitudeThreshold;
};
namespace Functor
{
template< typename TInput1, typename TInput2, typename TOutput >
class ITK_TEMPLATE_EXPORT InverseDeconvolutionFunctor
{
public:
InverseDeconvolutionFunctor() { m_KernelZeroMagnitudeThreshold = 0.0; }
~InverseDeconvolutionFunctor() {}
bool operator!=( const InverseDeconvolutionFunctor & ) const
{
return false;
}
bool operator==( const InverseDeconvolutionFunctor & other) const
{
return !(*this != other);
}
inline TOutput operator()(const TInput1 & I, const TInput2 & H) const
{
const double absH = std::abs( H );
TOutput value = NumericTraits< TOutput >::ZeroValue();
if ( absH >= m_KernelZeroMagnitudeThreshold )
{
value = static_cast< TOutput >( I / H );
}
return value;
}
/** Set/get the threshold value below which complex magnitudes are considered
* to be zero. */
void SetKernelZeroMagnitudeThreshold(double mu)
{
m_KernelZeroMagnitudeThreshold = mu;
}
double GetKernelZeroMagnitudeThreshold() const
{
return m_KernelZeroMagnitudeThreshold;
}
private:
double m_KernelZeroMagnitudeThreshold;
};
} //namespace Functor
}
#ifndef ITK_MANUAL_INSTANTIATION
#include "itkInverseDeconvolutionImageFilter.hxx"
#endif
#endif
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