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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 itkExtrapolateImageFunction_h
#define itkExtrapolateImageFunction_h
#include "itkImageFunction.h"
namespace itk
{
/**
* \class ExtrapolateImageFunction
* \brief Base class for all image extrapolaters.
*
* ExtrapolateImageFunction is the base for all ImageFunctions that
* extrapolates image intensity at a non-integer pixel position
* outside the image buffer.
* This class is templated over the input image type and the
* coordinate representation type (e.g. float or double ).
*
* \warning This hierarchy of functions work only for images
* with scalar pixel types.
*
* \ingroup ImageFunctions
*
*
* \ingroup ITKImageFunction
*/
template <typename TInputImage, typename TCoordRep = float>
class ExtrapolateImageFunction
: public ImageFunction<TInputImage, typename NumericTraits<typename TInputImage::PixelType>::RealType, TCoordRep>
{
public:
ITK_DISALLOW_COPY_AND_MOVE(ExtrapolateImageFunction);
/** Standard class type aliases. */
using Self = ExtrapolateImageFunction;
using Superclass =
ImageFunction<TInputImage, typename NumericTraits<typename TInputImage::PixelType>::RealType, TCoordRep>;
using Pointer = SmartPointer<Self>;
using ConstPointer = SmartPointer<const Self>;
/** \see LightObject::GetNameOfClass() */
itkOverrideGetNameOfClassMacro(ExtrapolateImageFunction);
/** OutputType type alias support */
using typename Superclass::OutputType;
/** InputImageType type alias support */
using typename Superclass::InputImageType;
/** Dimension underlying input image. */
static constexpr unsigned int ImageDimension = Superclass::ImageDimension;
/** Point type alias support */
using typename Superclass::PointType;
/** Index type alias support */
using typename Superclass::IndexType;
/** ContinuousIndex type alias support */
using typename Superclass::ContinuousIndexType;
/** RealType type alias support */
using RealType = typename NumericTraits<typename TInputImage::PixelType>::RealType;
/** Extrapolate the image at a point position
*
* Returns the extrapolated image intensity at a
* specified point position.
*/
OutputType
Evaluate(const PointType & point) const override
{
const ContinuousIndexType index =
this->GetInputImage()->template TransformPhysicalPointToContinuousIndex<TCoordRep>(point);
return (this->EvaluateAtContinuousIndex(index));
}
/** Extrapolate the image at a continuous index position
*
* Returns the extrapolated image intensity at a
* specified point position.
*/
OutputType
EvaluateAtContinuousIndex(const ContinuousIndexType & index) const override = 0;
/** Extrapolate the image at an index position.
*
* Returns the extrapolated image intensity at a
* specified point position.
*/
OutputType
EvaluateAtIndex(const IndexType & index) const override = 0;
protected:
ExtrapolateImageFunction() = default;
~ExtrapolateImageFunction() override = default;
};
} // end namespace itk
#endif
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