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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 itkGaussianInterpolateImageFunction_h
#define itkGaussianInterpolateImageFunction_h
#include "itkInterpolateImageFunction.h"
#include "itkConceptChecking.h"
#include "itkFixedArray.h"
#include "vnl/vnl_erf.h"
namespace itk
{
/**
* \class GaussianInterpolateImageFunction
* \brief Evaluates the Gaussian interpolation of an image.
*
* This class defines an N-dimensional Gaussian interpolation function using
* the vnl error function. The two parameters associated with this function
* are:
* 1. Sigma - a scalar array of size ImageDimension determining the width
* of the interpolation function.
* 2. Alpha - a scalar specifying the cutoff distance over which the function
* is calculated.
*
* This work was originally described in the Insight Journal article:
* P. Yushkevich, N. Tustison, J. Gee, Gaussian interpolation.
* \sa{https://www.insight-journal.org/browse/publication/705}
*
* \author Paul Yushkevich
* \author Nick Tustison
*
* \ingroup ITKImageFunction
*/
template <typename TInputImage, typename TCoordRep = double>
class ITK_TEMPLATE_EXPORT GaussianInterpolateImageFunction : public InterpolateImageFunction<TInputImage, TCoordRep>
{
public:
ITK_DISALLOW_COPY_AND_MOVE(GaussianInterpolateImageFunction);
/** Standard class type aliases. */
using Self = GaussianInterpolateImageFunction;
using Superclass = InterpolateImageFunction<TInputImage, TCoordRep>;
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
/** \see LightObject::GetNameOfClass() */
itkOverrideGetNameOfClassMacro(GaussianInterpolateImageFunction);
/** Method for creation through the object factory. */
itkNewMacro(Self);
/** ImageDimension constant. */
static constexpr unsigned int ImageDimension = TInputImage::ImageDimension;
/** OutputType type alias support */
using typename Superclass::OutputType;
/** InputImageType type alias support */
using typename Superclass::InputImageType;
/** RealType type alias support */
using typename Superclass::RealType;
/** Index type alias support */
using typename Superclass::IndexType;
/** Size type alias support */
using typename Superclass::SizeType;
/** ContinuousIndex type alias support */
using typename Superclass::ContinuousIndexType;
/** Array type alias support */
using ArrayType = FixedArray<RealType, ImageDimension>;
/** Set input image. */
void
SetInputImage(const TInputImage * image) override
{
Superclass::SetInputImage(image);
this->ComputeBoundingBox();
}
/** Set/Get sigma. */
virtual void
SetSigma(const ArrayType s)
{
if (this->m_Sigma != s)
{
this->m_Sigma = s;
this->ComputeBoundingBox();
this->Modified();
}
}
virtual void
SetSigma(RealType * s)
{
ArrayType sigma;
for (unsigned int d = 0; d < ImageDimension; ++d)
{
sigma[d] = s[d];
}
this->SetSigma(sigma);
}
itkGetConstMacro(Sigma, ArrayType);
/** Set/Get alpha. */
virtual void
SetAlpha(const RealType a)
{
if (Math::NotExactlyEquals(this->m_Alpha, a))
{
this->m_Alpha = a;
this->ComputeBoundingBox();
this->Modified();
}
}
itkGetConstMacro(Alpha, RealType);
/** Set/Get sigma and alpha. */
virtual void
SetParameters(RealType * sigma, RealType alpha)
{
this->SetSigma(sigma);
this->SetAlpha(alpha);
}
/** Evaluate at the given index. */
OutputType
EvaluateAtContinuousIndex(const ContinuousIndexType & cindex) const override
{
return this->EvaluateAtContinuousIndex(cindex, nullptr);
}
SizeType
GetRadius() const override;
protected:
GaussianInterpolateImageFunction();
~GaussianInterpolateImageFunction() override = default;
void
PrintSelf(std::ostream & os, Indent indent) const override;
virtual void
ComputeBoundingBox();
using RegionType = ImageRegion<ImageDimension>;
/** Compute the region which we need to loop over. */
RegionType
ComputeInterpolationRegion(const ContinuousIndexType &) const;
virtual void
ComputeErrorFunctionArray(const RegionType & region,
unsigned int dimension,
RealType cindex,
vnl_vector<RealType> & erfArray,
vnl_vector<RealType> & gerfArray,
bool evaluateGradient = false) const;
/** Set/Get the bounding box starting point. */
itkSetMacro(BoundingBoxStart, ArrayType);
itkGetConstMacro(BoundingBoxStart, ArrayType);
/** Set/Get the bounding box end point. */
itkSetMacro(BoundingBoxEnd, ArrayType);
itkGetConstMacro(BoundingBoxEnd, ArrayType);
/** Set/Get the cut-off distance. */
itkSetMacro(CutOffDistance, ArrayType);
itkGetConstMacro(CutOffDistance, ArrayType);
private:
/** Evaluate function value. */
virtual OutputType
EvaluateAtContinuousIndex(const ContinuousIndexType &, OutputType *) const;
ArrayType m_Sigma{};
RealType m_Alpha{};
ArrayType m_BoundingBoxStart{};
ArrayType m_BoundingBoxEnd{};
ArrayType m_ScalingFactor{};
ArrayType m_CutOffDistance{};
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
# include "itkGaussianInterpolateImageFunction.hxx"
# include "itkMath.h"
#endif
#endif
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