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/*=========================================================================
*
* Copyright UMC Utrecht and contributors
*
* 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 itkRecursiveBSplineInterpolationWeightFunction_h
#define itkRecursiveBSplineInterpolationWeightFunction_h
#include "itkBSplineInterpolationWeightFunction.h"
#include "itkBSplineKernelFunction2.h"
#include "itkBSplineDerivativeKernelFunction2.h"
#include "itkBSplineSecondOrderDerivativeKernelFunction2.h"
#include "itkMath.h"
namespace itk
{
/** \class RecursiveBSplineInterpolationWeightFunction
* \brief Returns the weights over the support region used for B-spline
* interpolation/reconstruction.
*
* Computes/evaluate the B-spline interpolation weights over the
* support region of the B-spline.
*
* This class is templated over the coordinate representation type,
* the space dimension and the spline order.
*
* \sa Point
* \sa Index
* \sa ContinuousIndex
*
* \ingroup Functions ImageInterpolators
* \ingroup ITKCommon
*/
template <typename TCoordRep = float, unsigned int VSpaceDimension = 2, unsigned int VSplineOrder = 3>
class ITK_TEMPLATE_EXPORT RecursiveBSplineInterpolationWeightFunction
: public BSplineInterpolationWeightFunction<TCoordRep, VSpaceDimension, VSplineOrder>
{
public:
ITK_DISALLOW_COPY_AND_MOVE(RecursiveBSplineInterpolationWeightFunction);
/** Standard class typedefs. */
using Self = RecursiveBSplineInterpolationWeightFunction;
using Superclass = BSplineInterpolationWeightFunction<TCoordRep, VSpaceDimension, VSplineOrder>;
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
/** New macro for creation of through the object factory. */
itkNewMacro(Self);
/** Run-time type information (and related methods). */
itkTypeMacro(RecursiveBSplineInterpolationWeightFunction, FunctionBase);
/** Space dimension. */
itkStaticConstMacro(SpaceDimension, unsigned int, VSpaceDimension);
/** Spline order. */
itkStaticConstMacro(SplineOrder, unsigned int, VSplineOrder);
/** Typedefs from superclass*/
using typename Superclass::WeightsType;
using typename Superclass::IndexType;
using typename Superclass::SizeType;
using typename Superclass::ContinuousIndexType;
/** The number of indices. */
static constexpr unsigned NumberOfIndices = Math::UnsignedPower(VSplineOrder + 1, VSpaceDimension);
/** Get number of indices. */
itkGetConstMacro(NumberOfIndices, unsigned int);
WeightsType
Evaluate(const ContinuousIndexType & index, IndexType & startIndex) const;
WeightsType
EvaluateDerivative(const ContinuousIndexType & index, const IndexType & startIndex) const;
WeightsType
EvaluateSecondOrderDerivative(const ContinuousIndexType & index, const IndexType & startIndex) const;
protected:
RecursiveBSplineInterpolationWeightFunction() = default;
~RecursiveBSplineInterpolationWeightFunction() override = default;
using Superclass::PrintSelf;
private:
/** Evaluate the weights at specified ContinousIndex position.
* Subclasses must provide this method. */
WeightsType
Evaluate(const ContinuousIndexType & index) const override;
/** Evaluate the weights at specified ContinousIndex position.
* The weights are returned in the user specified container.
* This function assume that weights can hold
* (SplineOrder + 1)^(SpaceDimension) elements. For efficiency,
* no size checking is done.
* On return, startIndex contains the start index of the
* support region over which the weights are defined.
*/
void
Evaluate(const ContinuousIndexType & index, WeightsType & weights, IndexType & startIndex) const override;
/** Private members; We unfortunatly cannot use those of the superclass. */
unsigned int m_NumberOfIndices{};
/** Interpolation kernel type. */
using KernelType = BSplineKernelFunction2<VSplineOrder>;
using DerivativeKernelType = BSplineDerivativeKernelFunction2<VSplineOrder>;
using SecondOrderDerivativeKernelType = BSplineSecondOrderDerivativeKernelFunction2<VSplineOrder>;
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
# include "itkRecursiveBSplineInterpolationWeightFunction.hxx"
#endif
#endif
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