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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 itkBSplineInterpolationDerivativeWeightFunction_h
#define itkBSplineInterpolationDerivativeWeightFunction_h
#include "itkBSplineInterpolationWeightFunctionBase.h"
namespace itk
{
/** \class BSplineInterpolationDerivativeWeightFunction
* \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
*/
template <typename TCoordinate = float, unsigned int VSpaceDimension = 2, unsigned int VSplineOrder = 3>
class ITK_TEMPLATE_EXPORT BSplineInterpolationDerivativeWeightFunction
: public BSplineInterpolationWeightFunctionBase<TCoordinate, VSpaceDimension, VSplineOrder>
{
public:
ITK_DISALLOW_COPY_AND_MOVE(BSplineInterpolationDerivativeWeightFunction);
/** Standard class typedefs. */
using Self = BSplineInterpolationDerivativeWeightFunction;
using Superclass = BSplineInterpolationWeightFunctionBase<TCoordinate, 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). */
itkOverrideGetNameOfClassMacro(BSplineInterpolationDerivativeWeightFunction);
/** 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;
/** Set the first order derivative direction. */
virtual void
SetDerivativeDirection(unsigned int dir);
protected:
BSplineInterpolationDerivativeWeightFunction();
~BSplineInterpolationDerivativeWeightFunction() override = default;
/** Interpolation kernel types. */
using typename Superclass::KernelType;
using typename Superclass::DerivativeKernelType;
using typename Superclass::SecondOrderDerivativeKernelType;
using typename Superclass::OneDWeightsType;
/** Compute the 1D weights, which are:
* \f[ \beta( x[i] - startIndex[i] ), \beta( x[i] - startIndex[i] - 1 ),
* \beta( x[i] - startIndex[i] - 2 ), \beta( x[i] - startIndex[i] - 3 ) \f],
* with \f$\beta( x ) = \beta^2( x + 1/2 ) - \beta^2( x - 1/2 )\f$, in case of the
* derivative direction, and just \f$\beta(x) = \beta^3(x)\f$ for the non-derivative
* directions.
*/
void
Compute1DWeights(const ContinuousIndexType & index,
const IndexType & startIndex,
OneDWeightsType & weights1D) const override;
/** Print the member variables. */
void
PrintSelf(std::ostream & os, Indent indent) const override;
private:
/** Member variables. */
unsigned int m_DerivativeDirection{};
};
} // end namespace itk
#ifndef ITK_MANUAL_INSTANTIATION
# include "itkBSplineInterpolationDerivativeWeightFunction.hxx"
#endif
#endif
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